JPH0669533U - Valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] Protects the joint between the valve plug support member and the valve plug characteristic portion that are most easily corroded and removed by the controlled fluid, and prolongs the service life of the valve. A collar 31 is fitted to a joint portion 28 between a support member 25 and a valve plug characteristic portion 26 so that the joint portion 28 is not corroded or removed by a controlled fluid.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve device, and more particularly to an angle valve for controlling the pressure reduction of a slurry fluid with a high differential pressure.

[0002]

[Prior art]

 An angle valve is generally used for the pressure reduction / control line for coal slurry in a coal liquefaction plant or the pressure reduction / control line for a solid-liquid two-phase flow containing various catalysts in a chemical plant. The angle valve has the advantage that the piping system can be designed compactly because the flow direction of the fluid can be bent at a right angle. However, if the angle valve is excessively decompressed on the downstream side of the valve, a large amount of gas is generated in the over-decompression section and tends to become a flush fluid (gas-liquid two-phase flow). If this happens, abrasion and corrosion of the trim part will be a problem.

FIG. 2 shows a conventional example of this type of single-seat type angle valve. 1 is an upstream pipe that is horizontally piped, 2 is a pipe that is substantially vertically below the downstream opening end of the upstream pipe 1. The downflow side pipes 3 and 4 are angle valves and tail pieces connected between the upstream side pipe 1 and the downstream side pipe 2. The angle valve 3 is fitted into the valve body 7 having a fluid inlet 5 which is orthogonal to each other and which is horizontally opened and a fluid outlet 6 which is vertically downwardly opened, and a fluid outlet 6 from below through a gasket 9. A seat ring 8; a valve shaft 12 that is vertically movably inserted into the valve body 7 through a seal member 11 through a valve shaft insertion hole 10 that opens on the upper surface of the valve body 7; A valve plug 15 mounted on the seat ring 8 for controlling the opening and closing of the fluid passage hole 14 of the seat ring 8, a guide bush 16 fitted in the valve shaft insertion hole 10 for slidably guiding and holding the valve plug 15, and a valve shaft. A packing follower 17 that is inserted into the upper end opening of the insertion hole 10 and presses the seal member 11, and a packing flange that is fixed to the upper surface of the valve body 7 by a plurality of bolts 18 to press and fix the packing follower 17. Made 19 or the like, the fluid inlet 5 is connected to the downstream side opening end of the upstream pipe 1, the tailpiece 4 to the fluid outlet port 6 is connected via a seat ring 8. The tail piece 4 holds the seat ring 8 in cooperation with the valve body 7 by being fixed to the lower surface of the valve body 7 with a plurality of bolts 20, and the upper end opening of the passage 21 formed through the center thereof. The portion is connected to the lower end opening of the seat ring 8 via the orifice 22, and the lower end is connected to the upper end opening of the downstream pipe 2. Therefore, the controlled fluid 24 is depressurized in two stages in the plug portion and the orifice portion, thereby reducing the amount of depressurized load on the valve plug 15 and extending the life of the plug. That is, on the downstream side of the valve, solid particles pass through the plug portion at a high speed, so that the outer peripheral surface of the characteristic portion of the valve plug 15 and the inner peripheral surface of the fluid circulation hole 14 are abraded and worn. As a result, the flow path expands beyond the original design value, and the valve opening is reduced to maintain the pressure reduction performance. When the wear progresses and the valve opening is completely reduced, the life of the valve is extended. To date, a product with a long life has not been developed. Therefore, the orifice 22 is incorporated to form a two-stage depressurization structure to reduce the burden on the valve plug 15. As a measure against wear of the valve plug 15 itself, as shown in FIG. 3, the support member 25 made of a high-strength material such as tungsten carbide and the like, and the support member 25 made of a wear-resistant material such as sintered diamond are used. The valve plug 15 is composed of a valve plug characteristic portion 26, which is joined to the tip end surface with silver solder, and a holder 27 that connects the support member 25 to the inner end of the valve shaft 12. Reference numeral 28 is a joint portion between the support member 25 and the valve plug characteristic portion 26, and 29 is a seat portion which is seated on the seat portion 30 of the seat ring 8 when fully closed.

[0004]

[Problems to be solved by the device]

 In the conventional angle valve described above, at present, it is not possible to obtain a valve plug 15 having such a large size that the entire valve plug 15 can be made of sintered diamond. It is manufactured by the method described above, and is joined to the supporting member 25 with silver solder. However, the joint 28 between the support member 25 and the valve plug characteristic portion 26 directly contacts the controlled fluid, and is easily corroded and removed. Therefore, the life of the valve is short, and the joint 28 cannot be inspected. There is a problem that extra work such as replacement work of the valve plug characteristic portion 26 is required.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a support member and a valve plug characteristic portion which have a simple structure and are most easily corroded and removed. Another object of the present invention is to provide a valve device in which the joint part of the valve is isolated and protected from the controlled fluid to prolong the life of the valve.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a valve device in which a fluid passage hole of a seat ring arranged by partitioning a flow path of a valve body is controlled to be opened and closed by a valve plug, wherein the valve plug has a stepped small diameter hole portion. A cylindrical holder having a valve shaft attached to the inner end, and a support member formed in a columnar shape by a high-strength material such as tungsten carbide and fitted and held in the stepped small diameter hole portion of the holder, A valve plug characteristic part made of a wear-resistant material such as sintered diamond, which is joined by silver brazing to the tip end surface of this support member, and a valve plug characteristic portion, which is joined by silver brazing at the tip end part of the support member, with the support member. It is composed of a collar that covers the part.

[0007]

[Action]

 In the present invention, the collar covers the joint between the valve plug characteristic portion and the support member and protects it from the controlled fluid.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the valve device according to the present invention. In the figure, the same components as those of the conventional device shown in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted. In the figure, in the present embodiment, a valve plug 15 is formed into a cylindrical body made of stainless steel or the like, and a holder 27 is screwed onto the outer peripheral surface of the lower end portion of the valve shaft 12; Of the support member 25 closely contacted to the lower end surface of the support member 25, a valve plug characteristic portion 26 made of a wear resistant material integrally joined to the front end surface of the support member 25 with silver solder, and the front end portion of the support member 25. It is composed of a collar 31 which is integrally joined by silver brazing and covers a joint portion 28 of the support member 25 and the valve plug characteristic portion 26, and other configurations are the conventional angle valve shown in FIGS. 2 and 3. Is the same as.

The inner hole 32 of the holder 27 has a different diameter hole so that the inner hole 32 is opened to the upper surface and the valve shaft 12 is screwed into the screw hole 32a, the straight hole 32b following the screw hole 32a, and the lower surface. The straight hole 32b comprises a small diameter hole portion 32c having a smaller diameter, and a tapered step portion 33 is provided between the straight hole 32b and the small diameter hole portion 32c. The diameter of the straight hole 32b is substantially equal to the root diameter of the screw hole 32a. The lower surface of the holder 27 is formed into a tapered taper surface.

The support member 25 is fitted and inserted from the upper end opening of the holder 27 and pressed by the lower end surface of the valve shaft 12, so that the chamfered portion 25 a provided at the intermediate portion of the outer peripheral surface becomes the stepped portion 33 of the holder 27. Pressed to prevent movement in the axial direction. The lower end portion of the support member 25 is fitted into the small diameter hole portion 32c and protrudes downward of the holder 27, the protruding end portion is formed into a truncated cone shape, and the fitting convex portion 35 integrally projects at the center of the lower end surface. Has been set up.

A fitting recess 36 that fits into the fitting projection 35 of the support member 25 is formed at the center of the contact surface of the valve plug characteristic portion 35 that is silver soldered to the lower surface of the support member 25. ing.

The collar 31 is made of stainless steel or the like in a cylindrical shape and is fitted to the outer peripheral portion of the upper end of the valve plug characteristic portion 26. The upper end opening forms a tapered hole 37 and the truncated cone of the support member 25 is formed. It is in close contact with the portion 25b and is joined by silver solder. The upper end of the outer peripheral surface of the color 31 is fitted into the small diameter hole 32c of the holder 27. Therefore, the collar 31 covers the joint 28 between the support member 25 and the valve plug characteristic portion 26 and the joint 38 between the support member 25 and the collar 31, and these joints 28 and 38 are corroded by the controlled fluid. , Prevent it from being removed. Further, since the upper end portion of the collar 31 is fitted into the holder 27, the controlled fluid does not enter the holder 27.

[0013]

[Effect of device]

 As described above, in the valve device according to the present invention, the collar is fitted to the joint between the support member forming the valve plug and the valve plug characteristic portion, and this joint is not corroded or removed by the controlled fluid. With this configuration, the durability of the valve plug can be remarkably improved, and the replacement work of the valve plug characteristic portion is unnecessary, and the practical effects are extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a valve device according to the present invention.

FIG. 2 is a sectional view of an essential part showing a conventional example of a valve device.

FIG. 3 is a cross-sectional view of a main part of the valve device.

[Explanation of symbols]

 1 Upstream Side Pipe 2 Downstream Side Pipe 3 Angle Valve 4 Tailpiece 5 Fluid Inlet 6 Fluid Outlet 7 Valve Body 8 Seat Ring 12 Valve Shaft 14 Fluid Flow Hole 15 Valve Plug 25 Supporting Member 26 Valve Plug Characteristic Section 27 Holder 28 Joining Part 31 Collar 32c Small diameter hole 38 Joining part

Front page continuation (72) Creator Mitsuo Kameyama 6-9-9 Komagome, Toshima-ku, Tokyo (72) Creator Tatsushi Shinogaya 29-3 Takatsuto-cho, Midori-ku, Chiba-shi, Chiba (72) Creator Yoshiyuki Okutsu Kanagawa 4-1-1 Omagari, Samukawa-cho, Takaza-gun, Yamaguchi, Shonan Plant, Yamatake Honeywell Co., Ltd. (72) Koichi Okawa 4-1-1, Omagari, Samukawa-cho, Takaza-gun, Kanagawa Sanbu Honeywell Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A valve device for controlling opening / closing of a fluid passage hole of a seat ring, which is arranged by partitioning a flow path of a valve body, by a valve plug, wherein the valve plug has a stepped small diameter hole portion. A cylindrical holder to be attached to the inner end, a support member fitted and held in the stepped small diameter hole portion of the holder, and a valve plug characteristic portion made of a wear resistant material, which is joined and fixed to the tip end surface of the support member. A collar that is fixedly joined to the front end surface of the support member and covers the joint portion between the valve plug characteristic portion and the support member, and a part of the outer peripheral surface of the collar is fitted into the stepped small diameter hole portion of the holder. A valve device, wherein the valve device is inserted and at least a part of a joint portion between the support member and the collar is positioned in the stepped small diameter hole portion.