JP2010121735A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve improved in the wear resistance, corrosion resistance and durability of a valve body, a valve seat and the like. <P>SOLUTION: Provided are a valve body (14) having two openings (15a, 15b) and a flow path (12), a valve stem (26) penetrating the valve body and a trim device (30) for controlling the flow of the fluid in the flow path, wherein the trim device comprises a valve seat (22) provided in the flow path of the valve body and a valve element (28) mounted to the valve stem and the part or whole of the valve element and/or the valve seat is comprised of an ultra-hard material having the content of 95% or more of tungsten carbide to solve the problems. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a valve, and more particularly to a valve used in a fluid process including solid particles, for example, a plant handling slurry, and relates to an angle type control valve, an eccentric rotary valve, and the like.

Conventionally, various types of valves such as control valves, safety valves, ball valves, gate valves, check valves, control valves, relief valves or butterfly valves have been used in various fluid machinery and chemical plants or nuclear power plants. in use. These valves are used to flow not only single-phase fluids in the gas phase, liquid phase and solid phase, but also two-phase fluids including two of them and three-phase fluids including all of them. Yes. In particular, a valve used in a liquid process in which liquid containing solid particles, cavitation, or flushing occurs, particularly a control valve, is required not to be worn, that is, to have high wear resistance.
For this reason, in order to maintain the wear resistance of such a valve, various parts, in particular, a portion that comes into contact with fluid, that is, a fluid contact portion, for example, a valve body (plug) and a valve seat (seat, seat ring). ) Is made of ceramic or high hardness material.

For example, as a material excellent in wear resistance, a valve using tungsten carbide (hereinafter also referred to as WC-Co) obtained by sintering tungsten carbide (WC) using cobalt (Co) (5% or more) as a binder (hereinafter also referred to as a material). For example, under the following conditions of use and fluid conditions, the parts exposed to solid particles in the valve will wear out in a few hours to a few days and the valve will reach the end of its service life. is there.
(1) Use of coal slurry in a coal liquefaction plant on a decompression control line (2) Use in a solid-liquid two-phase flow decompression / flow control control line containing solid particles such as various catalysts in a chemical plant For example, primary pressure : 15-20 MPa, temperature: 350-400 ° C,
In this case, when the pressure is excessively reduced on the downstream side of the valve, the dissolved gas component is flashed (vaporized) to become a gas / liquid / solid three-phase fluid, rapidly expanding, and the flow velocity almost reaches the speed of sound.
Even when the fluid condition does not reach the flash (vaporization) condition, if the solid particles are hard and have a high flow rate, similar wear occurs in the main part of the valve, and shortening the service life becomes a problem.
An example is a polycrystalline silicon production line.

Therefore, it has been attempted to use a material with high wear resistance for such a valve. By using sintered diamond for valve seats and orifices, which are parts with severe wear conditions, and using microcrystalline tungsten carbide (WC-Co) for plugs, which are moderately severe parts, Patent Document 1 discloses a pressure control valve with improved wear resistance.
That is, Patent Document 1 discloses, as a prior art, a conventional tungsten carbide having a Co (binder) content of 5 to 25% in a plug (valve element), a seat ring (valve seat), an orifice, and a seat holder. Angle valve type pressure control valves using (WC-Co) have been used, but it is disclosed that liquids and solids collide with these parts at high speeds, so that erosion and wear occur. In order to prevent functional degradation due to erosion and wear occurring in each part, the plug (valve body) and the seat holder contain Co content of 5 to 12%, titanium carbide (TiC) and tantalum carbide (TaC) Using ultra-fine tungsten carbide with an amount of 1-4%, sintered diamond for the seat ring (valve seat) and orifice, The retainer and the tailpiece, the control valve using conventional tungsten carbide described above are disclosed.

Japanese Patent No. 2698745

However, in the control valve disclosed in Patent Document 1, since the valve body portion is made of a WC-Co material and sintered diamond is not used, there is a problem that the wear resistance is not sufficient. Yes. Since the surface hardness of the WC-Co material is only Hv: 1800-1950, for example, the wear resistance against an Al ₂ O ₃ -based slurry having an Hv of about 2000 is insufficient.
That is, in the control valve disclosed in Patent Document 1, since the WC-Co material (ultrafine tungsten carbide) containing 5 to 12% Co as a WC binder is used for the valve body, wear resistance is increased. However, since Co is softer than WC, the Co portion is mainly worn away, resulting in a problem that the WC-Co material is worn. In addition, such a problem also occurs when a conventional WC-Co material containing 5 to 25% Co as a WC binder is used for the valve seat of the prior art control valve disclosed in Patent Document 1. Similarly, there is a problem that wear occurs.
Further, in the control valve disclosed in Patent Document 1, if the Co content of the WC-Co material used for the valve body is less than 5%, ductility and bending strength as a valve member are insufficient, and it is used for an orifice retainer and a tail piece. When the Co content of the conventional WC-Co material is less than 5%, the binder amount is insufficient, and the compressive strength is reduced. WC cannot be used as a valve member.

In general, in the case of conventional wear-resistant materials including cemented carbide (WC-Co), it is difficult to join the metal parts, which causes the manufacturing process to be complicated and the accompanying increase in material cost and manufacturing cost. In addition, the valve performance (for example, Cv value / maximum flow rate, flow rate control range, valve seat leakage amount, etc.) is often sacrificed for the connection, and the reliability of the valve performance is low. There was a problem.
For this reason, when WC-Co material is used for the valve body as in such a control valve, it is difficult to join the valve stem material, which is a metal part, by welding. However, since the corrosion resistance of silver brazing or the like is low, there is a problem that the corrosion proceeds due to contact with the fluid and eventually breaks.
That is, in such a valve, silver brazing is adopted for joining the WC-Co material and the stainless steel of the holding portion, but the heat resistance temperature is about 300 ° C., and the corrosion resistance of the joint portion due to silver brazing is high. When the halogen such as chlorine is present in the fluid because of insufficient, there is a problem that the WC-Co portion is dropped due to the corrosion of the joint portion, causing a shortened life of the bulb. In addition, when the fluid temperature is high, there is a risk of joint failure due to internal strain due to the difference in thermal expansion coefficient between the WC-Co material and the stainless steel material of the holding part, leading to dropout of the WC-Co part. There is a risk that the strength of the soldered joint will be reduced. Furthermore, when the WC—Co portion reaches a high temperature of about 450 ° C., Co precipitates, resulting in a decrease in strength and wear resistance due to cavitation. Thus, the silver brazing joint is not suitable for a control valve used in a high temperature and high pressure environment, and as a result, the reliability of the valve performance is low.

In addition, sintered diamond has a poor ability to adapt to the shape of individual valves, and it can be applied to parts of pilot plant level with a very small diameter. For example, in the case of a coal liquefaction plant, a pilot plant requires a valve having an inner diameter of Φ10 mm or less, whereas a commercial plant requires a Φ150 to 200 mm. However, if such a bulb is made of sintered diamond, the manufacturing cost is enormous and it is difficult to obtain sufficient reliability.
That is, as in the control valve disclosed in Patent Document 1, if a sintered diamond having high hardness and high wear resistance is used for the valve seat, high wear resistance can be obtained, but the component cost increases. There is a problem that the manufacturing cost increases.

The first object of the present invention is to eliminate the above-mentioned problems of the prior art and to prevent wear on a valve having improved wear resistance, corrosion resistance and durability, in particular, a valve body and a valve seat, etc., and high wear resistance. Providing valves with improved wear resistance, corrosion resistance and durability, such as valve bodies and valve seats, which can use sintered materials that are resistant to erosion, seizure and galling, and have high corrosion resistance and durability. There is to do.
The second object of the present invention is to provide a valve that can solve the problems of the prior art and maintain the strength of components such as a valve body and a valve seat in addition to the first object. It is in.
The third object of the present invention is to solve the problems of the prior art and perform welding without brazing the joint between the valve stem and the valve body in addition to the first and second objects. It is to provide a valve that can.
Furthermore, the fourth object of the present invention is to solve the above-mentioned problems of the prior art and reduce the material cost and the manufacturing cost in addition to the above first to third objects, but the reliability of the valve performance. It is in providing the valve which can improve.

In order to solve the above-mentioned problem, a valve according to a first aspect of the present invention includes a valve body having two openings and a flow path communicating the two openings, a valve stem penetrating the valve body, A trim device that controls the flow of fluid in the flow path between the two openings, the trim device comprising: a valve seat provided in the flow path of the valve body; A valve body attached to the valve stem, and prevents the flow of fluid in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, the valve body is configured to flow a fluid into the flow path between the two openings, and a part of the valve body or All from a sintered body of super hard material with a tungsten carbide content of over 95% It is characterized by becoming.
According to the valve of this aspect, by constituting a part or all of the valve body with a cemented carbide material having a tungsten carbide content of more than 95%, the wear resistance, corrosion resistance and durability of the valve body, in turn, the valve can be improved. Can be improved.

Here, the valve body can be welded so that a part or all of the valve body head made of the sintered body of the super hard material having a tungsten carbide content exceeding 95% can be welded to the valve stem. A weldable portion made of a material, and a first mixed portion made of a sintered body in which both the cemented carbide material and the weldable material are mixed between the valve head and the weldable portion. A composite member is preferred.
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
The valve head includes a peripheral portion that is the portion made of the sintered body of the cemented carbide material with a tungsten carbide content exceeding 95%, a core portion made of a strength securing material, the peripheral portion, It is preferable that the composite member has a second mixed portion made of a sintered body in which both the cemented carbide material and the strength securing material are mixed with the core portion.
In this case, the strength of parts such as a valve body can be further maintained.
Moreover, it is preferable that the said 1st mixing part of the said valve body is interposed between the said core part of the said valve body head, and the said weldable part.

Further, the valve body includes a peripheral portion made of the sintered body of the cemented carbide material having a tungsten carbide content exceeding 95%, a core portion made of a strength securing material, and between the peripheral portion and the core portion. It is preferable that the composite member has a second mixed portion made of a sintered body in which both the superhard material and the strength ensuring material are mixed.
In this case, the strength of parts such as a valve body can be further maintained.
The valve body further includes a weldable portion made of a weldable material capable of being welded to the valve stem, and the cemented carbide material and the weldable material between the core portion and the weldable portion. It is preferable to have a first mixed portion made of a sintered body in which both materials are mixed.
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
The weldable part of the valve body is preferably welded to the valve stem.
Moreover, it is preferable that a part or all of the valve seat is made of a sintered body of a super hard material having a tungsten carbide content exceeding 95%.
More preferably, a part or all of the valve body and / or a part or all of the valve seat is made of a sintered body of a super hard material having a tungsten carbide content of 96% or more.

In order to solve the above problems, a valve according to a second aspect of the present invention includes a valve body having two openings and a flow channel communicating the two openings, a valve stem penetrating the valve body, A trim device that controls the flow of fluid in the flow path between the two openings, the trim device comprising: a valve seat provided in the flow path of the valve body; A valve body attached to the valve stem, and prevents the flow of fluid in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, a fluid flows in the flow path between the two openings, and a part of the valve seat or All from a sintered body of super hard material with a tungsten carbide content of over 95% And wherein the Rukoto.
According to the valve of this aspect, by constituting a part or all of the valve seat with a cemented carbide material having a tungsten carbide content of more than 95%, the wear resistance, corrosion resistance and durability of the valve seat, and hence the valve, are improved. Can be improved.

Here, the valve seat includes an outer edge portion made of a strength securing material, an inner edge portion made of a sintered body of a super hard material having a tungsten carbide content of more than 95%, and between the outer edge portion and the inner edge portion. It is preferable that the composite member has a third mixed portion made of a sintered body in which both the superhard material and the strength ensuring material are mixed.
In this case, the strength of parts such as a valve seat can be further maintained.
Further, the valve seat includes the inner edge portion, is made of the sintered body of a super hard material having a tungsten carbide content exceeding 95%, has a fluid contact portion that comes into contact with the fluid, and the third mixed portion is It is preferable to interpose between the outer edge portion and the fluid contact surface portion.
Moreover, it is preferable that the said fluid contact part has the said inner edge part and the said valve body side upper edge part.
More preferably, part or all of the valve seat is made of a cemented carbide sintered body having a tungsten carbide content of 96% or more.

According to the present invention, it is possible to use a sintered body of a super hard material having high wear resistance, corrosion resistance, and durability for a valve body and a valve seat, and improve these wear resistance, corrosion resistance, and durability. As a result, the wear resistance, corrosion resistance and durability of the valve can be improved.
Further, according to the present invention, in addition to the above effects, the strength of components such as the valve body and the valve seat can be maintained, and welding is performed without brazing the joint between the valve stem and the valve body. Further, the reliability of the valve performance can be improved while suppressing the material cost and the manufacturing cost.

  Below, the valve concerning the present invention is explained in detail based on the suitable embodiment shown in an accompanying drawing.

FIG. 1 is a cross-sectional view of a main part of an example of an angle valve to which a valve according to an embodiment of the present invention is applied.
As shown in the figure, the angle valve 10 includes a valve main body 14 having a flow path 12 that has a substantially L-shaped cross section, a valve chamber 16 formed in the middle of the flow path 12, and a valve chamber 16. A guide 18 that partially faces, a cage 20 that partially faces the valve chamber 16 so as to face the guide 18, a valve seat (seat ring) 22 held by the cage 20, and the valve body 14 are connected to the guide 18. A drive unit 24 (partially shown) that is in close contact with the valve 18, a valve stem 26 that penetrates the guide 18 and has one end supported by the drive unit 24, and a valve chamber 16 provided at the tip of the valve stem 26. And a valve body (valve plug) 28 facing inward.
The valve seat 22 held by the valve body 14 via the cage 20 and the valve body 28 provided at the tip of the valve stem 26 constitute a trim device 30. In the illustrated example, the trim device 30 may further include a guide 18 and a cage 20.
In the illustrated example, the valve seat 22 is configured to be held by the valve main body 14 via the cage 20, but the present invention is not limited to this, and the angle valve 100 (see FIG. 9) described later is not limited thereto. As described above, the valve seat 22 may be held directly on the valve body 14.

Further, the valve body 14 has an inlet port (opening) 15a communicating with the flow path 12 on the fluid inflow side (left side of the valve chamber 16 in FIG. 1), and the fluid discharge side (valve chamber 16 in FIG. 1). Further, a delivery port (opening) 15b communicating with the flow path 12 is provided on the lower side. Further, the valve body 14 is connected to a flange portion 14a for pipe connection for connecting an upstream pipe (not shown) to the inlet port 15a, and a downstream pipe (not shown) to the outlet port 15b. For this purpose, a flange portion 14b for pipe connection is formed.
In such a configuration, in the angle valve 10, the valve seat 22 and the valve body 28 of the trim device 30 are positioned on the valve seat 22 by the valve stem 26 that is driven up and down by the drive unit 24. When the valve body 28 is located away from the valve seat 22 by the valve stem 26 while preventing the flow of fluid in the flow path 12 between the inlet port 15a and the outlet port 15b, the inlet port A fluid is configured to flow in the flow path 12 between the port 15a and the outlet port 15b. Thus, the trim device 30 controls the flow of the fluid passing through the angle valve 10 and adjusts the pressure of the fluid before and after the angle valve 10.

  Here, in the present invention, part or all of the valve seat 22 and / or the valve body 28 of the trim device 30 has a tungsten carbide (WC) content of more than 95%, that is, more than 95%. % Of carbide material, in other words, tungsten carbide (WC) with an impurity content of less than 5%, for example, Co or other pure tungsten carbide (WC) carbide material. It is comprised by the sintered member. As a result, it is possible to prevent the valve seat 22 and / or the valve body 28 from being worn due to the passage of fluid.

Next, detailed configurations of the valve stem 26 of the angle valve 10 of the present invention, the valve seat 22 of the trim device 30, and the valve body 28 will be described.
FIG. 2 is a cross-sectional view schematically showing a detailed configuration of an embodiment of the valve stem of the angle valve, the valve seat of the trim device, and the valve body shown in FIG. FIG. 3 is a schematic cross-sectional view showing a detailed configuration of a valve stem of a conventional angle valve, a valve seat of a trim device, and a valve body. 4 (a) and 4 (b) are cross-sectional views schematically showing the detailed configuration of the embodiment of the valve body shown in FIG. 2, respectively. FIGS. 5A, 5B, and 5C are cross-sectional views schematically showing detailed configurations of other examples of the valve stem and the valve body of the angle valve shown in FIG. 2, respectively. 6A is a cross-sectional view schematically showing a detailed configuration of the embodiment of the valve seat shown in FIG. 2, and FIG. 6B is a modified example of the valve seat shown in FIG. 6A. It is.
In FIGS. 2 to 6B, the shapes of the valve stem 26 of the angle valve 10, the valve seat 22 of the trim device 30, and the valve body 28 shown in FIG. 1 are simplified for easy understanding. Is shown.

In the angle valve 10 shown in FIG. 2, the valve body 28 of the trim device 30 is a rod-shaped member, and is provided on the tip side, and a part or all of the content is 95% tungsten carbide (hereinafter referred to as WC). A valve body head 32 made of a super hard material, a weldable part 36 made of a weldable material provided on the proximal end side and capable of being welded to the valve stem 26, and a valve body head 32 and a weldable part. 36, and a composite material having a mixed portion 34 in which both a cemented carbide material having a WC content exceeding 95% and a weldable material are mixed.
The weldable portion 36 of the valve body 28 and the valve stem 26 are connected and fixed via the welded portion 38.
On the other hand, in the angle valve 10 shown in FIG. 2, the valve seat 22 of the trim device 30 is a ring-shaped member and is provided on the inner peripheral surface side thereof, and is an inner edge made of a super hard material having a WC content exceeding 95%. Portion 40, provided on the outer peripheral surface side, made of a strength securing material such as metal, provided between the outer edge portion 44 constituting the valve seat body, the inner edge portion 40 and the outer edge portion 44, and having a WC content of 95%. It is comprised from the composite material which has the mixing part 42 in which both the super hard material and the strength ensuring material are mixed.

  On the other hand, as shown in FIG. 3, in the conventional angle valve 200, the valve body 206 of the trim device 204 has a Co content as described in detail in the section of the related art such as Patent Document 1, for example. 5 to 12%, or 5 to 25%, that is, a rod-like member made of a single material of tungsten carbide (WC-Co) cemented carbide with a WC content of 95% or less, and its base end side is a metal material such as stainless steel The valve body 206 and the valve stem 202 are connected via a silver brazing portion 208 and fixed. Similarly, the valve seat 210 of the trim device 204 is a ring-shaped member made of a single material of super hard material such as WC-Co or sintered diamond.

First, the valve body 28 of the trim device 30 shown in FIGS. 2, 4A, and 4B will be described. As shown in these drawings, the valve body head portion 32 provided on the distal end side of the valve body 28 of the trim device 30 is in contact with and separated from the inner edge portion 40 of the valve seat 22 provided opposite thereto, so that the angle valve 10. The amount and pressure of the fluid flowing through the flow path are controlled.
In the angle valve 10 of the present invention shown in FIG. 2, the valve body head portion 32 of the valve body 28 of the trim device 30 constitutes the main body of the valve body 28, and includes a fluid, particularly a fluid containing solid particles, a gas phase, a liquid. It is a portion where wear due to a three-phase fluid of a phase and a solid phase is likely to occur, and is a feature of the present invention. In the present invention, it is formed of a cemented carbide material having a WC content exceeding 95%.

For this reason, in the angle valve 10 of the present invention, even if it comes into contact with a fluid containing solid particles, wear and corrosion do not occur or progress, and high wear resistance, corrosion resistance and durability are maintained. can do. On the other hand, in the conventional angle valve 200 shown in FIG. 3, the valve body 206 and the valve seat 210 of the trim device 204 are made of WC-Co having a WC content of 95% or less. As described above, it may occur, progress, and lead to breakage.
Here, the cemented carbide material having a WC content of more than 95% includes a cemented carbide material and impurities having a WC content of more than 95%, that is, a content of impurities such as Co as a binder of less than 5%. Super hard materials consisting of pure WC with no WC content of 100% are included.
In addition, as a substance of less than 5% contained in the cemented carbide material having a WC content of more than 95% used in the present invention, as a binder component, a second component, a reaction product, a decomposition product, etc., Co, Ti, Ta Ni, Cu, C, B, TiC, TaC, W and the like may be included, and Fe, Mo, Ca, Si, Al, Mg and the like may be included as inevitable impurities.

Next, the weldable part (or weldable part) 36 of the valve body 28 is provided on the side in contact with the valve stem 26 and is a part for enabling the valve stem 26 and the valve body 28 to be welded. It is formed using a weldable material such as the same material as the stem 26 or a material having high weldability with the valve stem 26. Here, since a metal material such as stainless steel is usually used for the valve stem 26, it is preferable to use a metal material such as stainless steel as a weldable material for the weldable portion 36.
The metal material used for the valve stem 26 is not particularly limited as long as it is excellent in corrosion resistance and durability and can be welded. For example, stainless steel, Hastelloy, Inconel, Monel, Incoloy, etc. In addition to nickel alloys, chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, alloys and compounds such as intermetallic compounds, and metals such as nickel, zirconium, and titanium can be used.

Accordingly, the weldable material used for the weldable portion 36 of the valve body 28 is not particularly limited as long as it is a metal material that is excellent in corrosion resistance and durability and can be welded. For example, stainless steel, Hastelloy, Inconel, In addition to nickel alloys such as Monel and Incoloy, alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys and intermetallic compounds, and metals such as nickel, zirconium and titanium are used. Can do.
As described above, in the present invention, by providing the weldable portion 36 at the base end portion of the valve body 28, the welded portion 38 is formed by welding between the weldable portion 36 and the valve stem 26. Can be joined by welding.

Next, the mixed part 34 of the valve element 28 is a part provided between the valve element head part 32 and the weldable part 36 of the valve element 28 and has a WC content of 95% used for the valve element head part 32. It is formed from a material in which both a super-hard material and a weldable material used for the weldable portion 36 are mixed.
Here, the mixed state of both materials in the mixed portion 34 is not particularly limited as long as sintering can be performed to connect the valve body head 32 and the weldable portion 36 so as to maintain predetermined mechanical properties such as strength. However, as in the mixed portion 34a shown in FIG. 4 (a), both the cemented carbide material having a WC content of over 95% and the weldable material have a gradient composition, and FIG. 4 (b) shows. It is preferable that both materials are dispersed with each other as in the mixed portion 34b.

As described above, in the present invention, by providing the mixed portion 34 between the valve body head 32 and the weldable portion 36 of the valve body 28, the strength of the valve body head 32 and the weldable portion 36 is increased. A valve body made of a super hard material having a WC content of more than 95% and having good mechanical properties such as the strength of the valve body 28 while maintaining mechanical properties, and having good mechanical properties such as strength. A weldable portion can be formed on the valve body 28 having the head portion 32.
The reason why it is preferable to provide the mixed portion 34 is that if the mixed portion 34 is not provided, the weldability between the carbide material and the same kind or other metal is determined regardless of the presence or absence of components other than WC in the carbide material. Due to extremely low heat load caused by welding and the difference in integer of thermal expansion between the valve body head portion 32 and the weldable portion 36, the valve body head portion 32 may be broken or weld strength may be low. This is because there is a possibility that it cannot withstand actual use. Thus, by providing the mixed part 34, it becomes possible to solve these problems at a stretch.

In the mixed portion 34a shown in FIG. 4A, on the side in contact with the valve body head 32, the ratio of the super hard material having a WC content of more than 95% is set to 100%, and the weldable portion is separated from the valve body head 32. As the position approaches 36, the proportion of the superhard material is gradually decreased and the proportion of the weldable material is increased. On the side in contact with the weldable portion 36, the composition is inclined so that the proportion of the weldable material is 100%. However, the present invention is not limited to this, and the ratio of the super hard material on the side in contact with the valve body head 32 is more than 50%, and the ratio of the weldable material on the side in contact with the weldable part 36 is 50%. As long as it is super and the composition in the mixed portion 34a is inclined, it may be any ratio, may be inclined in any way, and may be appropriately selected according to both materials. . For example, at the time of powder filling before sintering, the composition ratio may be changed by 10 steps from 10 to 10% from one material to the other material. By tilting the composition in this way, a valve body having sufficient strength can be obtained.
Further, the material structure of the mixed portion 34a is a structure in which a substance having a lower melting point (metal of the weldable portion 36) diffuses and penetrates into the grain boundary portion in the superhard material.

  Further, in the mixed portion 34b shown in FIG. 4B, the cemented carbide material having a WC content of more than 95% and the weldable material are evenly mixed, that is, both materials are dispersed by 50% each other. Preferably, it is preferable to uniformly mix and disperse, but the present invention is not limited to this, and both materials have a relationship between matrix and dispersion, that is, dispersion in which one is a matrix and the other is dispersed. As long as it is a mold composite material, both materials may be dispersed at any ratio, and may be dispersed in any manner. For example, as a pretreatment of powder before sintering, in a stainless steel container coated with a cemented carbide material, a cemented carbide having a WC content exceeding 95% of a predetermined amount, for example, an amount corresponding to 40% of the container volume. A mixture of a material and a weldable material, and a predetermined amount, for example, an amount of carbide balls corresponding to 30% of the same, are charged, and the ball mill is mixed and stirred at a predetermined speed for a predetermined time, for example, at a speed of 100 revolutions per minute for 24 hours. By doing so, a valve body having sufficient strength can be obtained.

In the present invention, as shown in FIG. 4 (a) or (b), the powder molded body of the valve body head portion 32 constituting the valve body 28 is formed of a powder of super hard material having a WC content of more than 95%. The powder molded body of the mixed portion 34 (34a, 34b) is formed by mixing each powder of the cemented carbide material and the weldable material in accordance with the mixed state (gradient composition, dispersion) so as to integrally follow this. Further, the powder molded body of the weldable portion 36 is formed of a powder of a weldable material so as to integrally follow this, thereby forming a composite powder molded body in which the valve body 28 is integrated, and the valve body 28 is formed. The sintered compact of the valve body 28 made of the composite member shown in FIG. 4 (a) or (b) can be produced by sintering the composite powder compact of the above and machining it into an appropriate size and shape. it can.
By welding the weldable part 36 of the sintered valve body 28 obtained in this way to the valve stem 26, the two can be easily and firmly joined via the welded part 38. In the present invention, since the valve body 28 and the valve stem 26 are joined by welding, the valve stem 202 and the valve body 206 shown in FIG. 3 are joined by brazing via the silver brazing 208. As in the case of the angle valve 200, because of low corrosion resistance, there is no progress of corrosion due to contact with a fluid, reduction in bonding strength, shortening of service life, or the like.
The valve body 28 used in the present invention and the angle valve 10 using the same are basically configured as described above.

In the embodiment described above, the valve body head 32 of the valve body 28 is formed of a super hard material having a WC content of more than 95%. However, the present invention is not limited to this, and is composed of a plurality of materials. You may form with a composite member.
FIG. 5A shows another embodiment of the valve stem and valve body of the angle valve shown in FIG. The valve stem 26 and the valve element 28c shown in FIG. 5A have the same configuration except that the valve stem 26 and the valve element 28 shown in FIG. 2 are different from the valve element heads 32 and 32a. Therefore, the same components are denoted by the same reference numerals, detailed description thereof is omitted, and differences are mainly described.

As shown in FIG. 5A, the valve body 28c is composed of a valve body head portion 32a, a mixed portion 34 (34a, 34b: see FIG. 4), and a weldable portion 36. The weldable portion 36 is a welded portion 38. And is welded to the valve stem 26 via welding.
The valve body head 32a of the valve body 28c includes a peripheral edge portion 46 made of a super hard material having a WC content of more than 95%, a core portion 50 made of a strength securing material, and a gap between the peripheral edge portion 46 and the core portion 50. It consists of a composite member having a mixed portion 48 in which both a hard material and a strength ensuring material are mixed.
Here, the peripheral edge 46 of the valve body head 32a is cylindrical in shape, and the shape is different from the valve body head 32 of the valve body 28 shown in FIGS. 2, 4 (a) and 4 (b). A super hard material similar to that of the valve body head 32 may be used to form a cylindrical shape in the same manner.

The core portion 50 is a valve body head main body that is a central portion of the valve body head 32a, and thus is a columnar member that forms the valve body main body. This is a portion that ensures the strength of 28c.
Here, the strength ensuring material forming the core portion 50 may be any material as long as it can secure the strength of the valve body head portion 32a and the valve body 28c. Fine carbide WC-Co (Co content 5-12%, TiC and TaC total content 1-4%) and conventional WC-Co (Co content 5-25%) carbide materials (hereinafter collectively referred to as both) And the like, which are inferior in corrosion resistance and hardness, such as a WC-Co-based superhard material), but a superhard material having a predetermined strength is also preferable. As such a WC-Co based cemented carbide material, any cemented carbide material may be used as long as a predetermined strength can be secured.
In addition, as a strength ensuring material for forming the core portion 50, a nickel alloy such as stainless steel, hastelloy, inconel, monel, incoloy, etc. can be used as long as a predetermined strength can be secured, and other materials that can be used. Examples thereof include alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, and intermetallic compounds, and metals such as nickel, zirconium, and titanium.

The mixed portion 48 of the valve body head portion 32a is a portion provided between the peripheral edge portion 46 and the core portion 50 of the valve body head portion 32a, and is a carbide having a WC content of more than 95% used in the peripheral edge portion 46. It is formed from a material in which both super hard materials of a material (hereinafter referred to as a WC base super hard material) and a WC-Co base super hard material used for the core portion 50 are mixed.
Here, the mixed state of both materials in the mixed portion 48 is not particularly limited as long as the peripheral portion 46 and the core portion 50 can be sintered so that predetermined mechanical properties such as strength can be maintained. It is preferable that both the WC-based cemented carbide material and the WC-Co-based cemented carbide material have a gradient composition, and the two materials are dispersed in each other.

Thus, in the present invention, by providing the mixed portion 48 between the peripheral portion 46 and the core portion 50 of the valve head portion 32a of the valve body 28c, the hardness of the peripheral portion 46 and the strength of the core portion 50 are increased. The peripheral edge portion 46 and the core portion 50 can be connected (joined) while maintaining the above, and the surface hardness and strength of the valve body 28 and mechanical properties such as impact resistance can be improved. It should be noted that the impact resistance is improved by providing the mixed portion 48 depending on the purpose of use of the valve, which is frequently opened and closed repeatedly so as to prevent damage / breakage due to contact impact between the valve body and the valve seat. This is because it may be necessary to impart impact properties.
Also, the reason why it is preferable to provide the mixed portion 48 is the same as that of the cemented carbide material, regardless of the presence or absence of components other than WC in the cemented carbide material, as in the case of the mixed portion 34. Alternatively, the bondability with other metals is extremely low, and the peripheral portion 46 may be destroyed or the core portion 50 may be damaged due to a thermal load accompanying the bonding or a difference in thermal expansion coefficient between the peripheral portion 46 and the core portion 50. This is because there is a possibility that the bonding strength of the steel sheet becomes low and cannot be actually used. Thus, by providing the mixed part 48, it becomes possible to solve these problems at a stretch.

In the mixed portion 48, the ratio of the WC cemented carbide material is set to 100% on the side in contact with the peripheral edge 46, and the ratio of the WC cemented carbide material is gradually decreased as the distance from the peripheral edge 46 approaches the core 50. The ratio of the WC-Co cemented carbide material can be increased and the composition can be inclined so that the ratio of the WC-Co cemented carbide material is 100% on the side in contact with the core portion 50. The ratio of the WC-based cemented carbide material on the side in contact with the peripheral edge 46 is more than 50%, and the ratio of the WC-Co-based cemented carbide material on the side in contact with the core part 50 is more than 50%. As long as the composition in the portion 48 is inclined, the ratio may be any ratio, and it may be inclined in any manner, and may be appropriately selected according to both materials. For example, at the time of powder filling before sintering, the composition ratio may be changed by five steps from one material to the other material in five steps. By tilting the composition in this way, a valve body having sufficient strength can be obtained.
Further, as the material structure of such a mixed portion 48, a substance having a lower melting point (strength ensuring material (for example, weldable metal) of the core portion 50) diffuses and penetrates into the grain boundary portion in the cemented carbide material. It is an organization like this.

  Moreover, in the mixing part 48, it is preferable to mix the WC-based cemented carbide material and the WC-Co-based cemented carbide material evenly, that is, to disperse both materials by 50% each other. It is preferable to disperse, but the present invention is not limited to this, as long as both materials are in a relationship between matrix and dispersion, that is, a dispersive composite material in which one is a matrix and the other is dispersed. Well, both materials may be dispersed at any ratio, and may be dispersed in any manner. For example, as a pretreatment of powder before sintering, in a stainless steel container coated with a cemented carbide material, a cemented carbide having a WC content exceeding 95% of a predetermined amount, for example, an amount corresponding to 40% of the container volume. A mixture of a material and a WC-Co carbide material (or a weldable material) and a predetermined amount, for example, an amount of carbide balls corresponding to 30% of the same, are charged, and a predetermined speed, for example, every minute. A ball body having sufficient strength can be obtained by ball mill mixing and stirring for 24 hours at a speed of 100 revolutions.

  In the present invention, as shown in FIG. 5 (a), first, a powder molded body of the core portion 50 constituting the valve body head portion 32a of the valve body 28c is formed of powder of a WC-Co based superhard material, The powder molded body of the mixed portion 48 is mixed in accordance with the mixed state (gradient composition, dispersion) of the powder of the WC-Co-based cemented carbide material and the WC-based cemented carbide material so as to integrally cover the outer periphery thereof. Further, the powder molded body of the peripheral edge portion 46 is formed of powder of a WC-based superhard material so as to integrally cover the outer periphery thereof, and the composite powder molded body in which the valve body head portion 32a is integrated. The powder molded body of the mixed portion 34 (34a, 34b) is matched to the mixed state (gradient composition, dispersion) of the powders of the WC-based cemented carbide material and the weldable material so as to integrally follow this. The powder of the weldable part 36 is formed so as to be mixed and followed integrally therewith. Forming the form with a weldable material powder to form an integrated composite powder compact of the valve body 28c and sintering the composite powder compact of the valve body 28c to machine to the appropriate size and shape By doing so, a sintered body of the valve body 28c made of the composite member shown in FIG. 5A can be manufactured. At this time, the mixed portion 34 of the valve body 28 c may be formed so as to be interposed between the core portion 50 of the valve body head portion 32 a and the weldable portion 36.

By welding the weldable portion 36 of the sintered valve body 28 c thus obtained to the valve stem 26, the two can be easily and firmly joined via the welded portion 38. In the present invention, the valve body 28c and the valve stem 26 are joined by welding. Therefore, the valve stem 202 and the valve body 206 shown in FIG. As in the case of the angle valve 200, because of low corrosion resistance, there is no progress of corrosion due to contact with a fluid, reduction in bonding strength, shortening of service life, or the like.
In the example described above, the formation of the mixed portion 48 in the case where the core portion 50 is made of a WC-Co based cemented carbide material as the strength securing material and the peripheral portion 46 is made of a WC based cemented carbide material has been described. However, the present invention is not limited to this, and when the above-described strength securing material other than the WC-Co based cemented carbide material is used as the strength securing material used for the core portion 50, the WC-Co based cemented carbide material is used as another strength securing material. It goes without saying that the mixed portion 48 can be formed in the same manner only by changing.
The valve body 28c used in the present invention and the valve 10 using the same are basically configured as described above.

In the example shown in FIG. 5A, the valve body 28 c includes a valve body head portion 32 a made of a composite member having a peripheral edge portion 46, a mixed portion 48 and a core portion 50, a mixed portion 34, and a weldable portion 36. However, the present invention is not limited to this, and in the case where a weldable material such as stainless steel or a weldable metal material can be used as the strength ensuring material constituting the core portion 50, FIG. ) And (c), the valve body heads 32b and 32c themselves may be used as the valve bodies 28d and 28e without forming the mixed portion 34 and the weldable portion 36 in the valve body 28c.
That is, as described above, a weldable material such as stainless steel is used instead of the WC-Co-based cemented carbide material as the strength ensuring material constituting the core portion 50, and the core portion 50 and the disk portion 50a on the top portion thereof. And formed as a cylindrical member having a T-shaped cross section to form a composite powder molded body in which the valve body head portion 32b is integrated, and then a powder molded body of the mixed portion 34 and a powder molded body of the weldable portion 36 The composite powder molded body of the valve body head portion 32b is sintered and machined to an appropriate size and shape, so that the valve body 28d made of the composite member shown in FIG. A knot can be produced. In the illustrated example, it is preferable that the diameter of the disk portion 50 a is formed to be approximately equal to the outer diameter of the peripheral edge portion 46.

Thus, by forming the valve body head portion 32b itself, in which the core portion 50 is formed of a weldable material, as the valve body 28d, the valve stem 26 is made to be the disc portion 50a of the core portion 50 of the valve body head portion 32b. Can be directly welded to form a welded portion 38 between the valve stem 26 and the disc portion 50a of the core portion 50, and the valve stem 26 and the core portion 50, and thus the valve body 28d can be joined.
As shown in FIG. 5B, the reason why the core portion 50 is configured to have a “T-shaped” cross section is that the welding between the core portion 50 (disk portion 50a) and the valve stem 26 is performed on the outer peripheral portion. Because it is only possible. In the case of such a configuration, diffusion bonding can also be sufficiently applied as a method of coupling the core portion 50 (disk portion 50a) and the valve stem 26.
Further, as in the valve body 28e shown in FIG. 5C, a threaded portion 50b is provided on the disk portion 50a (weldable portion side) of the head portion of the core portion 50 of the valve body head portion 32c, and the valve stem 26 side It is also possible to provide a screw hole 26a, and screw the screw part 50b of the core part 50 into the screw hole 26a of the valve stem 26 to be screwed.

Next, the valve seats 22 and 22a of the trim device 30 shown in FIG. 2, FIG. 6 (a) and FIG. 6 (b) will be described.
In the angle valve 10 of the present invention shown in FIGS. 2 and 6A, as described above, the valve seat 22 of the trim device 30 includes the ring-shaped inner edge portion 40, the mixed portion 42, and the outer edge portion 44. The
As shown in these drawings, the inner edge 40 of the valve seat 22 of the trim device 30 is a ring-shaped member formed on the innermost side of the valve seat 22, and the valve body head of the valve body 28 of the trim device 30. Similarly to the part 32, it is a part that is easily worn by a fluid, particularly a fluid containing solid particles, a gas phase, a liquid phase, and a solid phase three-phase fluid, and is a feature of the present invention. In the present invention, the WC-based cemented carbide material having a WC content exceeding 95% is formed.

For this reason, in the angle valve 10 of the present invention, even if the inner edge portion 40 of the valve seat 22 comes into contact with a fluid containing solid particles, wear and corrosion do not occur or progress, and high resistance is obtained. Abrasion, corrosion resistance and durability can be maintained. On the other hand, in the conventional angle valve 200 shown in FIG. 3, the valve seat 210 of the trim device 204 is made of a WC-Co carbide material having a WC content of 95% or less. As described above, it may occur, progress, and lead to breakage.
Here, as the WC cemented carbide material used for the inner edge portion 40 of the valve seat 22, the same WC cemented carbide material used for the valve body 28 of the trim device 30 may be used.

The outer edge portion 44 is a ring-shaped member that is formed on the outermost side of the valve seat 22 and forms the main body of the valve seat 22, and is a portion that is made of a strength securing material and secures the strength of the valve seat 22.
Here, the strength ensuring material forming the outer edge portion 44 may be any material as long as the strength of the valve seat 22 can be secured, but is preferably a metal material such as stainless steel.
In addition, as a strength securing material for forming the outer edge portion 44, a nickel alloy such as stainless steel, hastelloy, inconel, monel, incoloy, etc. can be used as long as a predetermined strength can be secured, and other materials that can be used. Examples thereof include alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, and intermetallic compounds, and metals such as nickel, zirconium, and titanium.

The mixed portion 42 of the valve seat 22 is a portion provided between the inner edge portion 40 and the outer edge portion 44 of the valve seat 22, and is a strength used for the WC-based cemented carbide material used for the inner edge portion 40 and the outer edge portion 44. It is formed from a material obtained by mixing both materials with the securing material.
Here, the mixed state of the two materials in the mixed portion 42 is not particularly limited as long as the inner edge portion 40 and the outer edge portion 44 can be sintered so as to maintain predetermined mechanical properties such as strength. It is preferable that both the WC-based cemented carbide material and the strength ensuring material have a gradient composition and that both materials are dispersed with each other.

Thus, in the present invention, by providing the mixed portion 42 between the inner edge portion 40 and the outer edge portion 44 of the valve seat 22, the inner edge portion is maintained while maintaining the high hardness of the inner edge portion 40 and the strength of the outer edge portion 44. 40 and the outer edge portion 44 can be connected (joined), and the inner peripheral surface hardness and strength of the valve seat 22 and mechanical properties such as impact resistance can be improved. It should be noted that the provision of the mixed portion 42 to improve the impact resistance is such that the opening / closing is frequently repeated depending on the purpose of use of the valve, and the damage / breakage due to the contact impact between the valve body and the valve seat can be prevented. This is because it is sometimes required to impart impact properties, but the presence of the mixed portion can provide an impact absorption / relaxation effect.
Further, the reason why it is preferable to provide the mixed portion 42 is the same as that of the cemented carbide material, regardless of the presence or absence of components other than WC in the cemented carbide material, as in the case of the mixed portion 48. Alternatively, the bondability with other metals is extremely low, and the inner edge portion 40 may be destroyed or the outer edge portion 44 may be damaged due to a thermal load accompanying the bonding or a difference in thermal expansion coefficient between the inner edge portion 40 and the outer edge portion 44. This is because there is a possibility that the bonding strength of the resin becomes low and cannot be actually used. Thus, by providing the mixing unit 42, it is possible to solve these problems at once.

In the mixed part 42, the ratio of the WC cemented carbide material is set to 100% on the side in contact with the inner edge part 40, and the ratio of the WC cemented carbide material is gradually decreased as the distance from the inner edge part 40 approaches the outer edge part 44. The ratio of the strength ensuring material is increased and the composition can be inclined so that the ratio of the strength ensuring material is 100% on the side in contact with the outer edge portion 44. However, the present invention is not limited to this, and the inner edge portion 40 is not limited thereto. If the ratio of the WC cemented carbide material on the side in contact with the outer edge 44 is more than 50%, the ratio of the strength securing material on the side in contact with the outer edge 44 is more than 50%, and the composition in the mixed portion 42 is inclined. Any ratio may be used, and any inclination may be used, and it may be selected appropriately according to both materials. For example, at the time of powder filling before sintering, the composition ratio may be changed in four steps by 25% from one material to the other material. By tilting the composition in this way, a valve seat having sufficient strength can be obtained.
In addition, as the material structure of such a mixed portion 42, a substance having a lower melting point (strength ensuring material (for example, weldable metal) of the outer edge portion 44) diffuses and penetrates into the grain boundary portion in the cemented carbide material. It is an organization like this.

In the mixing unit 42, it is preferable that the WC-based cemented carbide material and the strength ensuring material are mixed evenly, that is, it is preferable that both materials be dispersed by 50% each other, and mixed and dispersed uniformly. However, the present invention is not limited to this, and it is sufficient that both materials have a relationship between a matrix and a dispersion, that is, a dispersion type composite material in which one is a matrix and the other is dispersed. May be dispersed at any ratio, and may be dispersed in any manner.
For example, as a pretreatment of powder before sintering, in a stainless steel container coated with a cemented carbide material, a cemented carbide having a WC content exceeding 95% of a predetermined amount, for example, an amount corresponding to 40% of the container volume. A mixture of a material and a WC-Co carbide material (or a weldable material) and a predetermined amount, for example, an amount of carbide ball corresponding to 30% of the same, are charged, and a predetermined speed, for example, every minute. By mixing and stirring the ball mill for 24 hours at a speed of 100 revolutions, a valve seat having sufficient strength can be obtained.

  In the present invention, first, as shown in FIG. 6A, the powder molded body of the inner edge portion 40 constituting the valve seat 22 is formed into a ring shape with the powder of the WC-based superhard material, and the outer peripheral surface thereof is integrated. So that the powder compact of the mixed portion 42 is mixed in accordance with the mixed state (gradient composition, dispersion) of the powder of the mixed portion 42 so as to form a ring shape. The powder molded body of the outer edge portion 44 is formed in a ring shape with powder of a strength ensuring material so as to integrally cover the outer peripheral surface, thereby forming a composite powder molded body in which the valve seat 22 is integrated, and the valve seat 22 is formed. The sintered compact of the valve seat 22 made of the composite member shown in FIG. 6A can be manufactured by sintering the composite powder compact of this and machining it into an appropriate size and shape.

In the above-described example, only the inner edge portion 40 that forms the inner peripheral surface of the through hole of the ring-shaped valve seat 22 through which the fluid passes is formed of a WC-based cemented carbide material. The upper edge 52 of the valve seat 22a is also made of a WC-based cemented carbide material, as shown in FIG. 6B. May be.
By doing in this way, in the valve seat 22a, the fluid contact part including the inner edge part 40 and the upper edge part 52 that comes into contact with the fluid can be formed of the WC-based super hard material, and the valve seat 22a is worn. Can be prevented.
The valve seats 22 and 22a used in the present invention and the valve 10 using the same are basically configured as described above.

The above-described examples are examples in which various embodiments of the present invention are applied to an angle valve. However, the present invention is not limited to the above-described examples, and can be applied to various types of valves.
FIGS. 7A and 7B are a cross-sectional view seen from the front and a top view, respectively, of the main part of an embodiment of the eccentric rotary valve to which the present invention is applied.
As shown in these drawings, the eccentric rotary valve 60 includes a valve main body 62 made of a mold or the like, a flow path 64 extending in a straight tube shape in the valve main body 62, and a valve chamber formed in the middle of the flow path 64. 66, a pair of upper and lower valve shafts (valve stems) 68 centering on an axis orthogonal to the fluid flow direction of the flow path 64, and a valve body (valve plug) 70 held by the valve shaft 68. ing.

A holding portion (retainer) 72 and a valve seat (seat ring) 74 are provided on one side of the valve main body 62 (on the left side of the valve chamber 66 in FIG. 7A). The flow path 64 is substantially formed by the holding portion 72, the valve seat 74, and the valve chamber 66.
The valve body 62 has an opening 65a communicating with the flow path 64 on one side, and an opening communicating with the flow path 64 on the other side (right side of the valve chamber 66 in FIG. 7A). 65b. In addition, the valve main body 62 has a pipe connection flange 62a for connecting a pipe (not shown) to the opening 65a, and a pipe connection for connecting a pipe (not shown) to the opening 65b. The flange portion 62b is formed.
The valve seat 74 held by the holding portion 72 in the valve main body 62 and the valve body 70 held by the pair of valve shafts 68 constitute a trim device 76.
In the eccentric rotary valve 60, any one of the opening 65a and the opening 65b can be disposed on the upstream side. However, when an abrasive fluid such as slurry is allowed to pass, the opening 65a is not provided. In the case where it is used on the upstream side, the abrasive fluid hits the inner wall surface of the valve main body 62 and wears the inner wall surface. It is preferable to use the portion 65b by arranging it on the upstream side. That is, in the case of a standard application, the eccentric rotary valve 60 is arranged such that the opening 65a (valve seat 74) is on the upstream side and the opening 65b (valve element 70) is on the downstream side. In the case of wear-resistant applications, it is preferable to arrange the opening 65b (valve element 70) on the upstream side and the opening 65a (valve seat 74) on the downstream side in order to protect the inner surface of the main body. .

Here, the valve shaft 68 is divided into two so as to sandwich the flow path 64, and each one end penetrates the valve main body 62 and is held by the valve main body 62 or a drive unit (not shown).
The valve body 70 has a substantially U-shaped cross section by a valve body main body 70 a that opens and closes the flow of fluid in the flow path 64 and a flange 70 b that is substantially fan-shaped in plan view for fixing the valve body head portion 70 a to the valve shaft 68. It is formed into a shape.
In this configuration, in the eccentric rotary valve 60, when the valve body 70 of the trim device 76 is rotated by the valve shaft 68 and the valve body head portion 70a of the valve body 70 is positioned on the valve seat 74, the opening is opened. The flow of the fluid in the flow path 64 between the portion 65a and the opening 65b is prevented, and the valve body 70 is rotated by the valve shaft 68 so that the valve body 70a of the valve body 70 is separated from the valve seat 74. When the flow path 64 is positioned, the fluid is caused to flow in the flow path 64 between the opening 65a and the opening 65b, and the inside of the flow path 64 of the valve body 62 is, for example, a hard solid. A fluid containing particles flows. Thus, the trim device 76 controls the flow of the fluid passing through the eccentric rotary valve 60 and adjusts the pressure of the fluid before and after the eccentric rotary valve 60.

Here, in the eccentric rotary valve 60 of the present invention, a part or all of the valve seat 74 and / or the valve body 70 of the trim device 76 is a WC-based cemented carbide material having a WC content exceeding 95%. It is comprised by the sintered member which consists of. As a result, it is possible to prevent the valve seat 74 and / or the valve body 70 from being worn due to the passage of fluid.
Although not shown here, the valve body 70 shown in FIG. 7 is different in shape from the valve bodies 28 to 28e shown in FIGS. 1 to 5 (c), but the valve body 70a is shown in FIGS. The valve body 28 to 28e shown in c) includes a valve body head portion, a mixed portion, and a weldable portion made of a WC carbide material, and a flange 70b is welded to the weldable portion of the valve body body 70a. Alternatively, the valve body 70a may be a valve body head made of a WC carbide material, the flange 70b may be a weldable part, and a mixed portion may be provided between the valve body 70a and the flange 70b. The flange 70b may be welded to the valve shaft 68, and the valve body 70a itself or the valve body head may be composed of a peripheral portion, a mixed portion and a core portion made of a WC carbide material. May be.
Further, the valve seat 74 shown in FIG. 7 is different in shape from the valve seat 22 shown in FIGS. 1 to 5 (c), but the valve seat 74 is made of an inner edge portion, a mixed portion and an outer edge portion made of a WC-based super hard material. You may comprise.

FIG. 8 is a cross-sectional view of a main part of one embodiment of a minute flow rate control valve to which the present invention is applied.
As shown in the figure, the micro flow rate adjusting valve 80 includes a valve body 84 having a flow path 82 that extends in the left and right directions in the figure and communicates with the upper and lower sides in the middle in the middle of the figure. A valve body 88 that opens and closes the valve chamber 86 as a valve chamber 86, and a valve seat (seat) that straddles the upper and lower sides of the flow path 82 constituting the valve chamber 86 and that is substantially opened and closed by the valve body 88. , Orifice) 90.
Further, the valve main body 84 is provided with a drive unit 94 for driving a valve stem 92 provided with a valve body 88 at the tip.
Further, the valve body 84 has an inlet port (opening) 85a communicating with the flow path 82 on the fluid inflow side (left side of the valve chamber 86 in FIG. 8), and the fluid discharge side (from the valve chamber 86 in FIG. 8). Also has a delivery port (opening) 85b communicating with the flow path 82 on the right side of the figure. Further, the valve body 84 is connected to a flange portion 84a for pipe connection for connecting an upstream pipe (not shown) to the inlet port 85a, and a downstream pipe (not shown) to the outlet port 85b. A flange portion 84b for connecting a pipe for this purpose is formed.
The valve seat 90 held by the valve main body 84 and the valve body 88 provided at the tip of the valve stem 92 constitute a trim device 96.

  In such a configuration, in the minute flow rate adjusting valve 80, the valve body 90 and the valve body 88 of the trim device 96 are positioned on the valve seat 90 by the valve stem 92 that is driven up and down by the drive unit 94. When the valve body 88 is positioned away from the valve seat 90 by the valve stem 92, the flow of the fluid in the flow path 82 between the inlet port 85a and the outlet port 85b is prevented. The fluid is configured to flow in the flow path 82 between the mouth port 85a and the outlet port 85b. Thus, the trim device 96 controls the flow of fluid passing through the minute flow rate adjusting valve 80 and adjusts the pressure of the fluid before and after the minute flow rate adjusting valve 80.

Here, in the present invention, part or all of the valve seat 90 and / or the valve body 88 of the trim device 96 is made of a sintered member made of a WC-based cemented carbide material. As a result, it is possible to prevent the valve seat 90 and / or the valve body 88 from being worn due to the passage of fluid.
In addition, although not shown here, the valve body 88 shown in FIG. 8 is similar to the valve body 28 shown in FIGS. The valve stem 92 may be welded to the weldable portion of the valve body 88, and the valve body head of the valve body 88 may be a peripheral portion, a mixed portion, and You may comprise with a core part.
Further, the valve seat 90 shown in FIG. 8 may be configured by an inner edge portion, a mixed portion, and an outer edge portion made of a WC-based cemented carbide material, similarly to the valve seat 22 shown in FIGS. 2 and 6.

FIG. 9 is a cross-sectional view of another embodiment of the angle valve to which the present invention is applied.
The angle valve 100 shown in FIG. 9 is different from the angle valve 10 shown in FIG. 1 in that the structure of the valve main body is different, the trim device cage is not provided, and the entire drive unit is illustrated. However, except for these, since they have substantially the same configuration, detailed description thereof will be omitted.
As shown in FIG. 9, the angle valve 100 includes a valve main body 104 that forms a flow path 102 that has a substantially L-shaped cross section, a valve chamber 106 that is formed in the middle of the flow path 102, and a valve main body 104. A guide 108 that is supported above and partly faces the valve chamber 106 from above, and a valve seat that is supported below the valve body 104 and partly faces the valve chamber 106 from below so as to face the guide 108 ( A seat ring) 110, a drive unit 112 connected to the valve body 104, a guide 108 and a valve stem 114 supported at one end by the drive unit 112, and provided at the tip of the valve stem 114. And a valve body (valve plug) 116 facing the valve chamber 106.
The valve seat 110 held by the valve main body 104 and the valve body 116 provided at the tip of the valve stem 1146 constitute a trim device 118. In the illustrated example, the trim device 118 may further include a guide 18.

  The valve body 104 is mounted on a valve box (body) 120 that forms a horizontal flow path 102a of the L-shaped flow path 102 and a valve chamber 106 that communicates with the horizontal flow path 102a, and an upper portion of the valve box 120. It has a valve lid (bonnet) 122 to be held and a cylindrical valve base 124 that supports the lower portion of the valve box 120 and holds the valve seat 110 therebetween, and the valve lid 122 and the flange 108a of the guide 108 are And between the flange 108a of the guide 108 and the valve box 120, between the valve box 120 and the flange 110a of the valve seat 110, and between the flange 110a of the valve seat 110 and the valve base 124. The gasket 126 is inserted respectively. A sleeve 128 that forms a vertical flow path 102 b of the L-shaped flow path 102 communicating with the valve chamber 106 is attached to the inner periphery of the cylindrical valve base 124 by a sleeve presser 130.

Further, the valve main body 104 has an inlet port (opening) 105a communicating with the horizontal flow path 102a of the flow path 102 on the fluid inflow side of the valve box 120 (left side of the valve chamber 106 in FIG. 9). An outlet port (opening) 105b communicating with the vertical flow path 102b of the flow path 102 is provided on the fluid discharge side of the base 124 (lower side than the valve chamber 106 in FIG. 9). The valve box 120 has a pipe connection flange 120a for connecting an upstream pipe (not shown) to the inlet port 105a, and the valve base 124 has a downstream pipe connected to the outlet port 105b. A flange portion 124a for pipe connection for connecting (not shown) is formed.
The drive unit 112 includes a yoke 132 attached to the upper portion of the valve lid 122 of the valve body 104 and a drive device 134 attached to the upper portion of the yoke 132. The valve stem 114 is supported by the valve lid 122 and the valve plug 116 connected to one end of the valve stem 114 is supported by the guide 108 so as to be movable up and down. The other end of the valve stem 114 is supported by the box-shaped yoke 132. It is covered and connected to the driving device 134 and driven up and down.

  In such a configuration, in the angle valve 100, the valve body 110 and the valve body 116 of the trim device 118 are positioned on the valve seat 110 by the valve stem 114 that is driven up and down by the drive unit 112. When the valve body 116 is positioned away from the valve seat 110 by the valve stem 114 while preventing the flow of fluid in the flow path 102 between the inlet port 105a and the outlet port 105b, the inlet port A fluid is configured to flow in the flow path 102 between the port 105a and the outlet port 15b. Thus, the trim device 118 controls the flow of the fluid passing through the angle valve 100 and adjusts the pressure of the fluid around the angle valve 100.

In the case of the angle valve 100, as shown in FIG. 9, the valve body head 116 a of the valve body 116 of the trim device 118 and the inner peripheral surface of the valve seat 110, and further the inner peripheral surface of the sleeve 128 on the valve seat side. A region indicated by a reference symbol W such as is a region to be worn.
However, in the present invention, the valve seat 110 and / or the valve body 116 of the trim device 118 are partly or entirely, like the valve seat 22 and / or the valve body 28 of the trim device 30 shown in FIG. It is made of a sintered member made of a super hard material having a tungsten carbide (WC) content of more than 95%. As a result, it is possible to prevent the wear of the valve seat 110 and / or the valve body 116 and the sleeve 128 due to the passage of fluid.
The valve stem 114 of the angle valve 100 of the present invention, the valve seat 110 and the valve body 116 of the trim device 118 are the same as the valve stem 26 of the angle valve 10 and the valve seat 22 and the valve body 28 of the trim device 30 shown in FIG. Since it has the same structure, the description about the detailed structure is abbreviate | omitted.

The valve according to the present invention will be specifically described below with reference to examples.
Example 1
The blast erosion test of the valve body used for the angle valve 100 in FIG. 9 was performed under the following experimental conditions.

As a sample, a sintered valve body sample having a composition of WC 96% and Co 4% and a shape of φ8 mm × 3 mm was produced.
The blast erosion test is performed by repeatedly injecting blast material from a nozzle onto a valve body sample under a predetermined injection condition as one shot, and performing multiple shots. Three types after 10 shots, 30 shots, and 100 shots, respectively The amount of wear of the body sample (wear depth: μm) was measured with a non-contact three-dimensional measuring device NH-3SP manufactured by Mitaka Koki Co., Ltd. The results are shown in Table 1 and FIG.
Incidentally, the blast material used for the test, white alumina (98% _Al 2 _{O 3,} Hardness: Hv2050), particle size: # 240, particle size: were of ～127Myuemu.
The injection conditions for one shot were as follows: nozzle diameter: 0.6 mmφ, injection pressure: 0.8 MPaG, particle velocity: 110 m / sec, injection time: 80 msec ON / 40 msec OFF, workpiece distance: 3 mm, incident angle: 90 ° It was.

(Examples 2 to 4)
A blast erosion test was performed in the same manner as in Example 1 except that the composition of the valve body sample was changed to WC 97.5% (Co 2.5%), WC 99% (Co 1%) and WC 100%. The amount of wear of the valve body sample after 30 shots and after 100 shots was measured. The results are shown in Table 1 and FIG.
(Comparative Examples 1-2)
A blast erosion test was performed in the same manner as in Example 1 except that the composition of the valve body sample was changed to WC 92% (Co 8%) (conventional sintered body made of WC superhard material) and WC 95% (Co 5%). The amount of wear of the valve body sample after 10 shots, 30 shots and 100 shots was measured. The results are shown in Table 1 and FIG.

As is clear from the results shown in Table 1 and FIG. 10, in the 10 shots and 30 shots, even in the valve body samples of Comparative Examples 1 and 2, the wear amount is as small as 11.7 μm or less, but in 100 shots, In Comparative Examples 1 and 2, they are 59 μm and 67.3 μm, respectively, whereas in Examples 1 to 4, they are 43.1 μm, 27.5 μm, 20.9 μm, and 0.1 μm or less, respectively. Compared with 2 and 2, approximately 2/3, approximately 1/2, approximately 1/3, and approximately 1/600 or less, each valve body sample of Examples 1 to 4 has a remarkable effect. I understand that there is. In particular, it can be seen that the valve body sample of Example 4 with a WC content of 100% has an overwhelmingly superior effect over Comparative Examples 1 and 2.
From the above, the effect of the present invention is clear.

  In addition, as a reference example, the present inventor also applied SUS316, stellite welding, a DLC (diamond-like carbon) coating 3 μm and a valve body sample having the composition of sintered diamond (the shape is the same as that of Example 1) as Example 1. Similarly, a blast erosion test was performed. Although not shown, Comparative Example 1 was used for SUS316 and stellite welding, Example 3 was used for a DLC coating of 3 μm, and Example 4 was used for sintered diamond. It was confirmed that the amount of wear was about the same.

Moreover, the result of having verified about the difficulty at the time of shape | molding a valve body and a valve seat with the sintered diamond which has a blast erosion characteristic equivalent to the valve body sample which consists of a sintered compact of WC100 super hard material is shown below.
When sintered diamond is used for the following reasons, it has been found that the manufacturing cost becomes enormous, and the shape adaptability is poor, and there is a limitation in use.
1) It was difficult to sieve to prepare the rough grains.
2) In the manufacturing process, sintering at 4000 ° C. and 50,000 atmospheres was necessary, and Co was required to be used for the binder.
3) Processing with powder of natural diamond was difficult, but accuracy was not sufficient. That is, the valve seat (seat ring) can be processed, but the characteristic part of the valve body (plug) cannot be processed.
4) The size was limited. For example, a round bar φ8 mm was the limit. In the case of a WC-based diamond layer (including a DLC layer, for example), the maximum thickness of the plate is 70 mm and the maximum thickness is 1.5 mm, and the maximum thickness of the rod is 37 mm × 9 mm. The limit was 1.0 mm.
5) It was difficult to join and connect with metal. For example, shrink fitting, silver brazing, etc. were not possible. For this reason, it was necessary to laminate a diamond powder using a Co binder based on WC. However, since Co was used for the binder, the operating temperature was limited.
6) Since it is mechanically fragile, it is weak against physical or thermal shock and has a drawback of easily cracking. For this reason, when the foreign material which mixes is bitten in the valve seat part, it may crack, or it may be cracked by a rapid temperature difference.

Next, an angle type control valve (overall structure diagram: angle valve 100 shown in FIG. 9, outer diameter φ6.9 mm of valve body 116, inner diameter φ7 mm of valve seat 110) is used as an industrial plant as a flow rate control valve to produce polycrystalline silicon. The results of verifying the application conditions and application results when applied to a line are shown below.
As operating conditions, it was used in a line for discharging excess silicon tetrachloride generated in the manufacturing process. In this line, metallic silicon and hydrogen chloride are reacted at 200 ° C. to 500 ° C. and then cooled, distilled and purified high-purity trichlorosilane is reduced and deposited using hydrogen at a high temperature. At that time, unreacted trichlorosilane is obtained. As a by-product, silicon tetrachloride was separated, but surplus silicon tetrachloride was discharged out of the system during the distillation process.
The primary pressure was 100 to 500 KPaG, the secondary pressure was open to the atmosphere, and the temperature was 50 to 100 ° C. The fluid contained a slurry of high hardness fine particles in silicon tetrachloride. The slurry of high-hardness fine particles present in the fluid caused wear when passing through the valve seat.
Since the valve attached to this line is used for flow rate control, it is often maintained at a substantially constant valve opening unless the operating conditions of the process are changed, and the valve body and valve seat receive from the fluid. Damage was in the same place.
Here, when the valve body and a part of the valve seat are worn, the passage area of the fluid is increased, so that the valve opening degree of the valve for control is decreased. Moreover, wear progressed in this place, and the valve opening degree further decreased.
In addition, when the valve body and the valve seat reach the valve seat portion that closes the fluid, the fluid cannot be closed when necessary, and the above-described wear is repeated, so that it can be used. It became nothing.

One of the applicants of the present application measured the life of valves of various materials when applying valves (angle valve 100) made of various materials to such a line. For example, it was confirmed that the service life was 1 week for diamond particle composite nickel plating (CDC), 3 months for Stellite No12, and 1 year for conventional WC (WC 92%) carbide material. .
A valve having a valve body and a valve seat made of the above three materials and WC 100% super hard material was used for a certain period under the above operating conditions, and the degree of wear was compared. The conventional WC (WC 92%) cemented carbide material was 1/10 or less. Accordingly, it can be estimated that the life of a valve having a valve body and a valve seat made of WC 100% super hard material is at least 3 years.

By the way, in each said Example and embodiment, although it disclosed as the angle valves 10 and 100, the eccentric type | mold rotary valve 60, and the micro flow control valve 80 as a valve, of course, application to valves other than these is also possible. is there.
Further, by using the valve of the present invention, cavitation and flushing, for example, the maximum flow velocity and the minimum pressure at the contracted portion in the valve, a cavity is generated here, and the subsequent flow collapses and the valve body and valve seat Even if the surface portion receives a strong pressure, it can be prevented from being worn.

As described above, the valve of the present invention can provide a valve with improved wear resistance, corrosion resistance and durability. Moreover, this invention can provide the valve which can maintain the intensity | strength of components, such as a valve body and a valve seat.
Moreover, this invention can provide the valve which can be welded, without brazing joining of a valve stem and a valve body.
Furthermore, the present invention can provide a valve capable of improving the reliability of the valve performance while suppressing the material cost and the manufacturing cost,
Accordingly, the present invention is a valve that can withstand use in a coal slurry decompression control line in a coal liquefaction plant and a solid-liquid two-phase decompression / flow control control line containing solid particles such as various catalysts in a chemical plant. The industrial applicability of the present invention is extremely high.

It is sectional drawing of the principal part of one Example of the angle valve to which the valve which concerns on one Embodiment of this invention is applied. It is sectional drawing which shows typically the detailed structure of one Example of the valve stem of the angle valve shown in FIG. 1, the valve seat of a trim apparatus, and a valve body. It is a cross-sectional schematic diagram which shows the detailed structure of the valve stem of the conventional angle valve, the valve seat of a trim apparatus, and a valve body. (A) And (b) is sectional drawing which shows typically the detailed structure of one Example of the valve body shown in FIG. 2, respectively. (A), (b) and (c) is sectional drawing which shows typically the detailed structure of the valve stem of the angle valve shown in FIG. 2, and the other Example of a valve body, respectively. (A) is sectional drawing which shows typically the detailed structure of one Example of the valve body shown in FIG. 2, (b) is a modification of the valve body shown to (a). (A) And (b) is sectional drawing seen from the front of the principal part of one Example of the eccentric rotary valve to which this invention is applied, respectively, and sectional drawing seen from the upper surface. It is sectional drawing of the principal part of one Example of the micro flow control valve to which this invention is applied. It is sectional drawing of the other Example of the angle valve to which this invention is applied. It is a graph which shows the wear amount (wear depth) with respect to the shot number of the valve body sample of the Example of this invention, and a comparative example.

Explanation of symbols

10, 100 Angle valve 12, 64, 82, 102 Flow path 14, 62, 84, 104 Valve body 16, 66, 86, 106 Valve chamber 22, 74, 90, 110 Valve seat 26, 92, 114 Valve stem 28, 28a, 28b, 28c, 28d, 28e, 70, 88, 116 Valve body 30, 76, 96, 118 Trim device 32, 32a, 32b, 32c, 116a Valve body head 34, 42, 48 Mixed part 36 Weldable part (Weldable part)
38 Welded portion 40 Inner edge portion 44 Outer edge portion 46 Peripheral portion 50 Core portion 52 Upper edge portion 60 Eccentric rotary valve 68 Valve shaft 80 Micro flow rate control valve

In order to solve the above-mentioned problem, a valve according to a first aspect of the present invention includes a valve body having two openings and a flow path communicating the two openings, a valve stem penetrating the valve body, A trim device that controls the flow of fluid in the flow path between the two openings,
The trim device includes a valve seat provided in the flow path of the valve body, and a valve body attached to the valve stem, and the valve body is positioned in the valve seat by the valve stem. And preventing flow of fluid in the flow path between the two openings, and when the valve body is positioned away from the valve seat by the valve stem, between the two openings. A part of or all of the valve body or part or all of the valve seat is sintered of a super hard material having a tungsten carbide content of 97.5% or more. It consists of a body.
According to the valve of the present aspect, the valve body, the pulling part, or the whole part of the valve body or the part or all of the valve seat is made of a super hard material having a tungsten carbide content of 97.5% or more. Thus, the wear resistance, corrosion resistance and durability of the valve can be improved.
Here, the tungsten carbide content of the sintered body of the super hard material is preferably less than 100%, and more preferably 97.5% or more and 99% or less.
The sintered body of the super hard material preferably contains tungsten carbide and at least one selected from the group consisting of Co, Ti, Ta, Ni, Cu, C, B and W.

In order to solve the above-described problem, the valve according to the second aspect of the present invention includes a valve body having two openings and a flow path communicating with the two openings, and a valve stem penetrating the valve body. And a trim device that controls the flow of fluid in the flow path between the two openings,
The trim device includes a valve seat provided in the flow path of the valve body, and a valve body attached to the valve stem, and the valve body is positioned in the valve seat by the valve stem. And preventing flow of fluid in the flow path between the two openings, and when the valve body is positioned away from the valve seat by the valve stem, between the two openings. At least one selected from the group consisting of tungsten carbide and Co, Ti, Ta, Ni, Cu, C, B, and W. It is characterized by comprising a sintered body of a super hard material including a seed and having a tungsten carbide content exceeding 95%.
According to the valve of this aspect, the tungsten carbide content exceeds 95% including at least one selected from the group consisting of Co, Ti, Ta, Ni, Cu, C, B and W in part or all of the valve body. By using the super hard material, it is possible to improve the wear resistance, corrosion resistance and durability of the valve body and, in turn, the valve.
Wherein said valve body includes a valve body head partially or entirely made of the sintered body before Symbol superhard material, and said valve welding the stem is made of weldable material capable fusible portion Preferably, the composite member includes a first mixed portion made of a sintered body in which both the cemented carbide material and the weldable material are mixed between the valve body head and the weldable portion. .
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
In addition, the valve body head includes a peripheral portion which is the portion made of the sintered body of the super hard material, a core portion made of a strength securing material, and the superstructure between the peripheral portion and the core portion. A composite member having a second mixed portion made of a sintered body in which both a hard material and the strength ensuring material are mixed is preferable.
In this case, the strength of parts such as a valve body can be further maintained.
Moreover, it is preferable that the said 1st mixing part of the said valve body is interposed between the said core part of the said valve body head, and the said weldable part.

The valve body includes a peripheral portion made of the sintered body of the cemented carbide material, a core portion made of a strength ensuring material, and the cemented carbide material and the strength securing between the peripheral edge portion and the core portion. A composite member having a second mixed portion made of a sintered body in which both materials are mixed is preferable.
In this case, the strength of parts such as a valve body can be further maintained.
The valve body further includes a weldable portion made of a weldable material capable of being welded to the valve stem, and the cemented carbide material and the weldable material between the core portion and the weldable portion. It is preferable to have a first mixed portion made of a sintered body in which both materials are mixed.
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
The weldable part of the valve body is preferably welded to the valve stem.
Moreover, it is preferable that a part or all of the valve seat is made of a sintered body of the cemented carbide material.
More preferably, part or all of the valve body and / or part or all of the valve seat is made of a sintered body of a super hard material having a tungsten carbide content of 96% or more.

In order to solve the above-described problem, a valve according to a third aspect of the present invention includes a valve body having two openings and a flow path communicating the two openings, a valve stem penetrating the valve body, A trim device that controls the flow of fluid in the flow path between the two openings, the trim device comprising a valve seat provided in the flow path of the valve body; A valve body attached to the valve stem, and prevents the flow of fluid in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, a fluid is caused to flow in the flow path between the two openings, and a part of the valve seat or all of the tungsten carbide, Co, Ti, Ta, Ni , Cu, C And at least one selected from the group consisting of B and W, characterized in that it consists of sintered tungsten carbide content greater than 95% of superhard material.
According to the valve of this aspect, a tungsten carbide content exceeding 95% including at least one selected from the group consisting of Co, Ti, Ta, Ni, Cu, C, B, and W in part or all of the valve seat. By using the super hard material, it is possible to improve the wear resistance, corrosion resistance and durability of the valve seat and, in turn, the valve.

Here, the valve seat, the superhard material and the strength ensured between the outer edge portion made of a securing strength material, the inner portion made of a sintered body of the superhard material, and said inner edge and said outer edge portion A composite member having a third mixed portion made of a sintered body in which both materials are mixed is preferable.
In this case, the strength of parts such as a valve seat can be further maintained.
Further, the valve seat comprises the inner portion consists of the sintered body of the superhard material, having a fluid contacting portion in contact with said fluid, said third mix section, the said outer edge fluid It is preferable to interpose between the contact surface portion.
Moreover, it is preferable that the said fluid contact part has the said inner edge part and the said valve body side upper edge part.
Further, the sintered body of the superhard material preferably contains tungsten carbide and Co, and more preferably contains at least one of TiC and TaC.
More preferably, part or all of the valve seat is made of a cemented carbide sintered body having a tungsten carbide content of 96% or more.

Next, the weldable part (or weldable part) 36 of the valve body 28 is provided on the side in contact with the valve stem 26 and is a part for enabling the valve stem 26 and the valve body 28 to be welded. It is formed using a weldable material such as the same material as the stem 26 or a material having high weldability with the valve stem 26. Here, since a metal material such as stainless steel is usually used for the valve stem 26, it is preferable to use a metal material such as stainless steel as a weldable material for the weldable portion 36.
The metal material used for the valve stem 26 is not particularly limited as long as it is excellent in corrosion resistance and durability and can be welded. For example, stainless steel, Hastelloy (registered trademark) , Inconel (registered ) Trademarks) , Monel (registered trademark) , nickel alloys such as Incoloy (registered trademark) , alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, intermetallic compounds, and nickel Further, metals such as zirconium and titanium can be used.

Accordingly, the weldable material used for the weldable portion 36 of the valve body 28 is not particularly limited as long as it is a metal material that is excellent in corrosion resistance and durability and can be welded. For example, stainless steel, Hastelloy (registered trademark) ) , Inconel (registered trademark) , Monel (registered trademark) , Incoloy (registered trademark) and other nickel alloys, as well as alloys such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys and intermetallic compounds In addition, compounds such as nickel, zirconium, titanium, and the like can be used.
As described above, in the present invention, by providing the weldable portion 36 at the base end portion of the valve body 28, the welded portion 38 is formed by welding between the weldable portion 36 and the valve stem 26. Can be joined by welding.

The core portion 50 is a valve body head main body that is a central portion of the valve body head 32a, and thus is a columnar member that forms the valve body main body. This is a portion that ensures the strength of 28c.
Here, the strength ensuring material forming the core portion 50 may be any material as long as it can secure the strength of the valve body head portion 32a and the valve body 28c. Fine carbide WC-Co (Co content 5-12%, TiC and TaC total content 1-4%) and conventional WC-Co (Co content 5-25%) carbide materials (hereinafter collectively referred to as both) And the like, which are inferior in corrosion resistance and hardness, such as a WC-Co-based superhard material), but a superhard material having a predetermined strength is also preferable. As such a WC-Co based cemented carbide material, any cemented carbide material may be used as long as a predetermined strength can be secured.
In addition, as a strength ensuring material for forming the core portion 50, stainless steel, Hastelloy (registered trademark) , Inconel (registered trademark) , Monel (registered trademark) , Incoloy (registered trademark), etc., can be used as long as a predetermined strength can be secured. Nickel alloys can also be used, and other materials that can be used include alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, intermetallic compounds, nickel, zirconium, Mention may also be made of metals such as titanium.

The outer edge portion 44 is a ring-shaped member that is formed on the outermost side of the valve seat 22 and forms the main body of the valve seat 22, and is a portion that is made of a strength securing material and secures the strength of the valve seat 22.
Here, the strength ensuring material forming the outer edge portion 44 may be any material as long as the strength of the valve seat 22 can be secured, but is preferably a metal material such as stainless steel.
In addition, as a strength ensuring material for forming the outer edge portion 44, stainless steel, Hastelloy (registered trademark) , Inconel (registered trademark) , Monel (registered trademark) , Incoloy (registered trademark), etc., as long as a predetermined strength can be secured. Nickel alloys can be used, and other materials that can be used include alloys and compounds such as chromium alloys, magnesium alloys, titanium alloys, cobalt alloys, aluminum alloys, zirconium alloys, intermetallic compounds, nickel, zirconium, Mention may also be made of metals such as titanium.

In order to solve the above-mentioned problem, a valve according to a first aspect of the present invention includes a valve body having two openings and a flow path communicating the two openings, a valve stem penetrating the valve body, A trim device that controls the flow of fluid in the flow path between the two openings, the trim device comprising a valve seat provided in the flow path of the valve body; A valve body attached to the valve stem, and prevents the flow of fluid in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, the valve body is configured to flow a fluid into the flow path between the two openings, and a part of the valve body or All or part or all of the valve seat is tungsten carbide. Characterized by comprising the sintering of Yuryou 97.5% or more superhard material.
According to the valve of the present invention, some or all of the valve body, or by constructing part or all of the valve seat in the superhard material over 97.5% tungsten carbide content, the valve body or valve It is possible to improve the wear resistance, corrosion resistance and durability of the seat and , in turn, the valve.
Here, the tungsten carbide content of the sintered body of the super hard material is preferably less than 100%, and more preferably 97.5% or more and 99% or less.
The sintered body of the superhard material is at least selected from the group consisting of tungsten carbide having a content of 97.5% or more, and the balance, Co, Ti, Ta, Ni, Cu, C, B, and W. 1 type is preferably included.

In order to solve the above-described problem, the valve according to the second aspect of the present invention includes a valve body having two openings and a flow path communicating with the two openings, and a valve stem penetrating the valve body. And a trim device that controls the flow of fluid in the flow path between the two openings, the trim device being a valve provided in the flow path of the valve body. And a fluid flow in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, fluid is allowed to flow in the flow path between the two openings. part or all of the tungsten carbide is more than 97.5% content, residual As to Co, Ti, Ta, Ni, Cu, C, characterized in that at least one consisting of a sintered body of including superhard material selected from the group consisting of B and W.
According to the valve of this aspect, the tungsten carbide content including a part or all of the valve body, with the balance being at least one selected from the group consisting of Co, Ti, Ta, Ni, Cu, C, B, and W. By comprising a super hard material of 97.5% or more , it is possible to improve the wear resistance, corrosion resistance and durability of the valve body and, in turn, the valve.
Here, the valve body, a part or all of the valve body head made of the sintered body of the cemented carbide material, and a weldable part made of a weldable material capable of welding to the valve stem, It is preferable that it is a composite member which has the 1st mixed part which consists of a sintered compact in which both the said super hard material and the said weldable material are mixed between the said valve body head and the said weldable part.
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
In addition, the valve body head includes a peripheral portion which is the portion made of the sintered body of the super hard material, a core portion made of a strength securing material, and the superstructure between the peripheral portion and the core portion. Preferably, the composite member includes a second mixed portion made of a sintered body in which both the hard material and the strength ensuring material are mixed.
In this case, the strength of parts such as a valve body can be further maintained.
Moreover, it is preferable that the said 1st mixing part of the said valve body is interposed between the said core part of the said valve body head, and the said weldable part.

Further, the valve body includes a peripheral portion made of the sintered body of the cemented carbide material, a core portion made of a strength ensuring material, and the cemented carbide material and the strength securing between the peripheral edge portion and the core portion. A composite member having a second mixed portion made of a sintered body in which both materials are mixed is preferable.
In this case, the strength of parts such as a valve body can be further maintained.
The valve body further includes a weldable portion made of a weldable material capable of being welded to the valve stem, and the cemented carbide material and the weldable material between the core portion and the weldable portion. It is preferable to have a first mixed portion made of a sintered body in which both materials are mixed.
In this case, welding can be further performed without brazing the joint between the valve stem and the valve body.
The weldable part of the valve body is preferably welded to the valve stem.
Moreover, it is preferable that a part or all of the valve seat is made of a sintered body of the superhard material.
Also, part or all of the valve body, and a part or all of the previous SL valve seat, it is more preferably made of a sintered body of the superhard material.

In order to solve the above-described problem, the valve according to the third aspect of the present invention includes a valve main body having two openings and a flow passage communicating the two openings, and a valve stem penetrating the valve main body. And a trim device that controls the flow of fluid in the flow path between the two openings, wherein the trim device is a valve provided in the flow path of the valve body. And a fluid flow in the flow path between the two openings when the valve body is positioned on the valve seat by the valve stem. And when the valve body is positioned away from the valve seat by the valve stem, the fluid is allowed to flow in the flow path between the two openings. part or all of the tungsten carbide is more than 97.5% content, residual As to Co, Ti, Ta, Ni, Cu, C, characterized in that at least one consisting of a sintered body of including superhard material selected from the group consisting of B and W.
According to the valve of this aspect, the tungsten carbide content including a part or all of the valve seat with at least one selected from the group consisting of Co, Ti, Ta, Ni, Cu, C, B, and W as the balance. By comprising a super hard material of 97.5% or more , it is possible to improve the wear resistance, corrosion resistance and durability of the valve seat and, in turn, the valve.

The valve seat includes an outer edge portion made of a strength securing material, an inner edge portion made of a sintered body of the cemented carbide material, and the cemented carbide material and the strength securing between the outer edge portion and the inner edge portion. A composite member having a third mixed portion made of a sintered body in which both materials are mixed is preferable.
In this case, the strength of parts such as a valve seat can be further maintained.
Further, the valve seat comprises the inner portion consists of the sintered body of the superhard material, having a fluid contacting portion in contact with said fluid, said third mix section, the said outer edge fluid It is preferable to interpose between the contact surface portion.
Moreover, it is preferable that the said fluid contact part has the said inner edge part and the said valve body side upper edge part.
Further, the sintered body of the superhard material, and tungsten carbide, preferably includes a Co, or even more preferred arbitrariness that comprises at least one TiC and TaC.

As a sample, a sintered valve body sample having a composition of WC 97.5 % and Co 2.5 % and a shape of φ8 mm × 3 mm was produced.
Blast erosion tests that injecting the blast material from the nozzle to the valve body sample at a predetermined injection condition, repeated as one shot performed a plurality of shots, after 10 shots, for the three after 30 shots and after 100 shots, respectively The amount of wear (wear depth: μm) of the valve body sample was measured with a non-contact three-dimensional measuring device NH-3SP manufactured by Mitaka Koki Co., Ltd. The results are shown in Table 1 and FIG.
Incidentally, the blast material used for the test, white alumina (98% _Al 2 _{O 3,} Hardness: Hv2050), particle size: # 240, particle size: were of ～127Myuemu.
The injection conditions for one shot were as follows: nozzle diameter: 0.6 mmφ, injection pressure: 0.8 MPaG, particle velocity: 110 m / sec, injection time: 80 msec ON / 40 msec OFF, workpiece distance: 3 mm, incident angle: 90 ° It was.

(Examples 2-3 and Reference Example 1 )
Except that the composition of the valve body sample was changed to WC 99% (Co 1 %) and WC 100% as Examples 2 and 3, respectively, and as WC 96% (Co 4%) as Reference Example 1, the same as in Example 1, A blast erosion test was performed, and the amount of wear of the valve body sample after 10 shots, 30 shots and 100 shots was measured. The results are shown in Table 1 and FIG.
(Comparative Examples 1-2)
A blast erosion test was performed in the same manner as in Example 1 except that the composition of the valve body sample was changed to WC 92% (Co 8%) (conventional sintered body made of WC superhard material) and WC 95% (Co 5%). The amount of wear of the valve body sample after 10 shots, 30 shots and 100 shots was measured. The results are shown in Table 1 and FIG.

As is clear from the results shown in Table 1 and FIG. 10, in the 10 shots and 30 shots, even in the valve body samples of Comparative Examples 1 and 2, the wear amount is as small as 11.7 μm or less, but in 100 shots, In Comparative examples 1 and 2, whereas the 59μm and 67.3μm, respectively, in example 1-3, it respectively, 2 7.5 [mu] m, or less 20.9μm and 0.1 [mu] m, Comparative example 1 and 2 the ratio base, approximately 1/2 about a substantially 1/3 and has a substantially 1/600 or less, in each valve body samples of examples 1-3, it can be seen that there is a remarkable effect. In particular, it can be seen that the valve body sample of Example 3 having a WC content of 100% has an overwhelmingly superior effect over Comparative Examples 1 and 2.
From the above, the effect of the present invention is clear.

Moreover, the result of having verified about the difficulty at the time of shape | molding a valve body and a valve seat with the sintered diamond which has a blast erosion characteristic equivalent to the valve body sample which consists of a sintered compact of WC100 super hard material is shown below.
When sintered diamond is used for the following reasons, it has been found that the manufacturing cost becomes enormous, and the shape adaptability is poor, and there is a limitation in use.
1) It was difficult to sieve to prepare the rough grains.
2) In the manufacturing process, sintering at 4000 ° C. and 50,000 atmospheres was necessary, and Co was required to be used for the binder.
3) it will be processed in the natural diamond powder, but processing difficult and the accuracy is not high enough above. That is, the valve seat (seat ring) can be processed, but the characteristic part of the valve body (plug) cannot be processed.
4) The size was limited. For example, a round bar φ8 mm was the limit. In the case of a WC-based diamond layer (including a DLC layer, for example), the maximum thickness of the plate is 70 mm and the maximum thickness is 1.5 mm, and the maximum thickness of the rod is 37 mm × 9 mm. The limit was 1.0 mm.
5) It was difficult to join and connect with metal. For example, shrink fitting, silver brazing, etc. were not possible. For this reason, it was necessary to laminate a diamond powder using a Co binder based on WC. However, since Co was used for the binder, the operating temperature was limited.
6) Since it is mechanically fragile, it is weak against physical or thermal shock and has a drawback of easily cracking. For this reason, when the foreign material which mixes is bitten in the valve seat part, it may crack, or it may be cracked by a rapid temperature difference.

Claims (12)

A valve body having two openings and a flow path communicating the two openings;
A valve stem that penetrates the valve body;
A trim device that controls the flow of fluid in the flow path between the two openings,
The trim device includes a valve seat provided in the flow path of the valve body, and a valve body attached to the valve stem, and the valve body is positioned in the valve seat by the valve stem. And preventing flow of fluid in the flow path between the two openings, and when the valve body is positioned away from the valve seat by the valve stem, between the two openings. Configured to flow fluid in the flow path of
A part or all of the valve body is made of a sintered body of a super hard material having a tungsten carbide content exceeding 95%. The valve body is
A valve body head part or all of which is made of the sintered body of the superhard material having a tungsten carbide content of over 95%;
A weldable portion made of a weldable material capable of being welded to the valve stem;
It is a composite member having a first mixed portion made of a sintered body in which both the cemented carbide material and the weldable material are mixed between the valve body head and the weldable portion. The valve according to claim 1. The valve head is
A peripheral portion that is the portion made of the sintered body of the superhard material having a tungsten carbide content of over 95%;
A core made of a strength securing material;
The composite member having a second mixed portion made of a sintered body in which both the cemented carbide material and the strength ensuring material are mixed between the peripheral edge portion and the core portion. 2. The valve according to 2.   The valve according to claim 3, wherein the first mixed portion of the valve body is interposed between the core portion of the valve body head and the weldable portion. The valve body is
A peripheral portion made of the sintered body of the superhard material having a tungsten carbide content of over 95%;
A core made of a strength securing material;
The composite member having a second mixed portion made of a sintered body in which both the cemented carbide material and the strength ensuring material are mixed between the peripheral edge portion and the core portion. The valve according to 1. The valve body further includes a weldable portion made of a weldable material capable of being welded to the valve stem,
The first mixed portion made of a sintered body in which both the cemented carbide material and the weldable material are mixed is provided between the core portion and the weldable portion. Valve.   The valve according to claim 2, wherein the weldable portion of the valve body is welded to the valve stem.   The valve according to any one of claims 1 to 7, wherein a part or all of the valve seat is made of a sintered body of a super hard material having a tungsten carbide content exceeding 95%. A valve body having two openings and a flow path communicating the two openings;
A valve stem that penetrates the valve body;
A trim device that controls the flow of fluid in the flow path between the two openings,
The trim device includes a valve seat provided in the flow path of the valve body, and a valve body attached to the valve stem, and the valve body is positioned in the valve seat by the valve stem. And preventing flow of fluid in the flow path between the two openings, and when the valve body is positioned away from the valve seat by the valve stem, between the two openings. Configured to flow fluid in the flow path of
A part or all of the valve seat is made of a sintered body of a super hard material having a tungsten carbide content exceeding 95%. The valve seat is
An outer edge made of a strength securing material;
An inner edge made of a sintered body of a super hard material having a tungsten carbide content of over 95%;
The composite member having a third mixed portion made of a sintered body in which both the cemented carbide material and the strength securing material are mixed between the outer edge portion and the inner edge portion. The valve according to 8 or 9. The valve seat includes the inner edge portion, is made of the sintered body of a super hard material having a tungsten carbide content of more than 95%, and has a fluid contact portion that comes into contact with the fluid,
The valve according to any one of claims 8 to 10, wherein the third mixed portion is interposed between the outer edge portion and the fluid contact surface portion.   The valve according to claim 11, wherein the fluid contact portion includes the inner edge portion and an upper edge portion on the valve body side.