RU2540345C1 - Valve unit - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: valve unit comprises a valve body, a valve seat (11, 12) set in the inner chamber of the valve body, and a valve plug (2) which can move relatively to the valve seat (11, 12). The valve seat (11, 12) includes the first seat (11) and the second seat (12) which are set in longitudinal direction. The valve plug (2) has the first contact part (21) and the second contact part (22). The first contact part (21) can contact with the first valve seat (11) and form a seal. The second contact part (22) includes an annular protrusion. The latter is made as capable of deformation after being pressed into the second seat (12). The second contact part (22) can form a seal by contacting with the second seat (12) by means of the deformed protrusion (20'). The valve body (1) is fitted by a blocking part to block the valve plug (2).

EFFECT: provision of sealing action of the valve plug and valve seat resulting in no necessity in exact machining of the valve plug and the valve seat.

11 cl, 12 dwg

Description

FIELD OF THE INVENTION

This invention relates to a valve assembly and, in particular, to a two-seat valve.

BACKGROUND

The design of the two-seat valve is widely used, since the two-seat valve can balance and better compensate for the force applied to the valve plug. The use of a two-seat valve has many advantages, and in particular, the actuator can actuate the valve plug to close the valve seat when only a small force is applied. However, it is difficult to control the gap between the valve seat and valve plug, and this is particularly difficult when a metal-metal seal is used in the valve seat and valve plug, and this causes the leakage of the two-seat valve to be greater than for a valve with one saddle.

In the prior art, the valve plug and valve seat are typically finished to reduce leakage. On the one hand, the valve plug is machined in accordance with the design of the surface of the valve seat to achieve a satisfactory sealing effect when in contact with the surface of the valve seat. On the other hand, it is necessary to carry out processing, such as grinding the surface of the valve seat, so that the surface of the valve seat is consistent with the surface of the valve plug. You can see that the technical process of the method is complex, and the cost is high.

SUMMARY OF THE INVENTION

The present invention is directed to a valve assembly capable of providing a higher sealing effect in a simple manner.

To achieve the objectives of this invention, a valve assembly is provided, wherein the valve assembly includes:

valve body;

a valve seat located in the inner chamber of the valve body, wherein the valve seat includes a first valve seat and a second valve seat located in the longitudinal direction; and

a valve plug for moving relative to the valve seat, wherein the valve plug includes a first contact part and a second contact part, wherein the first contact part is designed to contact the valve seat to form a seal, the second contact part includes an annular protrusion, wherein the protrusion is made with the possibility of deformation after extrusion into the second valve seat, while the second contact part is designed to form a seal by contact with the second valve seat using w deformed projection;

while the locking part, designed to block the rotation of the valve plug, is located in the inner chamber of the valve body.

Since only an annular protrusion is located on the valve plug and the protrusion can be deformed by compressing to form the sealing effect of the valve plug and valve seat, it is not necessary to accurately process the valve plug, so that the valve plug has a contact shape consistent with the valve seat. There is also no need to perform operations, such as grinding the valve seat, and a good sealing effect between the valve plug and the valve body can be achieved only by extruding the valve plug, which allows the control of the leakage flow in the closed state within the required range, which leads to savings processing cost. In addition to this, the blocking part prevents the valve plug from rotating in the valve body, which provides a better seal action.

According to one embodiment of the invention, the hardness of the protrusion material is less than the hardness of the material of the valve seat to allow the protrusion to deform in the event of extrusion.

In particular, the protrusion is made of bronze, and the valve seat is made of cast iron. Thus, the hardness of the protrusion material on the valve plug is less than the hardness of the valve seat material, and thereby the protrusion is deformed when the extrusion force acts on the valve plug.

According to another embodiment of the invention, the first valve seat includes a first inclined surface, the first contact portion of the valve plug includes a first contact surface substantially parallel to the first inclined surface, and the first inclined surface is designed to form a seal when it comes into contact with the first contact surface in order to achieve compaction effect due to hard surface-to-surface contact.

According to another embodiment of the present invention, the second valve seat includes a second inclined surface, and the protrusion of the valve plug is deformable after extrusion by a second inclined surface. Since the protrusion is deformable after being extruded by the second inclined surface, the protrusion can also form a contact surface corresponding to the second inclined surface.

According to one embodiment of the invention, the protrusion is located on the second contact surface, and the second contact surface is substantially parallel to the first inclined surface.

According to one embodiment of the invention, the protrusion is a rectangular bulge. The thickening is easier to deform in case of extrusion due to the presence of a right angle.

In an embodiment in which the protrusion is a rectangular thickening, the protrusion is able to form a contact surface after extrusion into the second valve seat, and the contact surface is essentially parallel to the second inclined surface. Thus, the formed contact surface can create a seal with a second inclined surface.

According to one embodiment of the invention, the protrusion is made in particular so that there is a gap between the first inclined surface and the first contact surface when the protrusion comes into contact with the second inclined surface without applying an external force. In the case of applying an external force, the protrusion is deformed due to an external force and can provide sealing contact with the second inclined surface, while the gap between the first inclined surface and the first contact surface is narrowed so that the first inclined surface comes into contact with the first contact surface with the implementation of the best compaction effect.

According to another embodiment of the present invention, the seating surface between the first contact surface and the second contact surface and the surface of the second valve seat is a movable fit in order to realize easier movement of the valve plugs up and down relative to the valve seat.

According to another embodiment of the present invention, the valve plug includes at least one pair of protruding tides located opposite, wherein a gap is formed between at least two protruding tides, the valve body includes a bulge consistent with the position of the slot, and the blocking part is capable of at least partially enter the slot in order to prevent rotation of the valve plug in the valve body, thereby achieving an improved sealing effect.

BRIEF DESCRIPTION OF THE DRAWINGS

The following is a more detailed explanation of the present invention with reference to the accompanying drawings, which do not limit the scope of the present invention and which depict:

1 is a sectional view of a valve body according to one embodiment of the present invention;

figa - part of the first valve seat of the embodiment according to figure 1 on an enlarged scale;

figv - part figa in an enlarged scale;

figure 3 - part of the second valve seat of the embodiment according to figure 1 on an enlarged scale;

figa - valve plug according to one variant of implementation of the present invention in a top view;

figv - section of the valve plug along the line CC in figa;

5 is a part of Q in figv in an enlarged scale;

6 is a part P in figv in an enlarged scale;

figa is a section along the line EE of the valve assembly according to one embodiment of the present invention;

7B is a sectional view of a valve assembly according to one embodiment of the present invention;

figa - part X in figv on an enlarged scale;

figv - part X1 on figa on an enlarged scale;

figa - part Y in figv on an enlarged scale;

figv - part Y1 on figa on an enlarged scale;

figa - part Z in figa on an enlarged scale;

figv - section of the valve assembly along the line F-F on figa to illustrate the locking part, which can prevent rotation of the valve plug in the valve body;

11 is a valve assembly according to one embodiment of the present invention in a half-open state;

figa - part S in Fig.11 on an enlarged scale;

figv - part T in Fig.11 on an enlarged scale; and

Fig - ratio of the opening of the valve body and the external force applied to the valve plug in assembled form.

DETAILED DESCRIPTION OF THE INVENTION

To explain the technical solutions, objectives and features of the present invention, the following is a description of specific embodiments of the present invention with reference to the accompanying drawings.

The present invention provides a valve assembly. Although a double-seat valve with pushing for opening is used to describe specific embodiments, the valve assembly can also be used in valves of other types and designs, for example double-seat valves with pushing for closing. The present invention is not limited to a valve of a particular type, and the valve design is also applicable to various types of media.

The valve assembly of the present invention includes, as shown in FIG. 1, a valve body; a valve seat located in the inner chamber of the valve body; and a valve plug designed to move relative to the valve seat, wherein the up and down movement of the valve plug relative to the valve seat can define different opening positions (fully open, partially open or half open, half) of the valve.

In such a two-seat valve, the first valve seat and the second valve seat are arranged in the longitudinal direction, and the valve plug includes a first contact part and a second contact part, wherein the first contact part of the first valve seat is designed to contact the first valve seat to form a seal, the second contact part has an annular protrusion, while the protrusion is designed to deform after extrusion into the second valve seat, while the second contact part is designed to form a seal when ontact with the second valve seat via the deformed protrusion.

When the first contact part comes into contact with the first valve seat to form a seal and the second contact part forms a seal by contacting the second valve seat with a deformed protrusion, the closed position of the valve is set.

When the valve plug moves relative to the valve seat, the first contact part and the first valve seat come out of contact, and the deformed protrusion of the second contact part also comes out of contact with the second valve seat, various valve states are set from partially open to fully open.

Additionally, the blocking portion can prevent rotation of the valve plug in the valve body, which provides an improved seal action.

The valve body 1 shown in FIG. 1 includes an inner chamber 16 and an upper hole 14 for positioning the valve stem (not shown), a valve plug (not shown) can enter the inner chamber 16 of the valve body 1 through the lower hole 18 of the valve body 1 and the valve plug may be clamped by a tide 19 in the valve body 1 to prevent rotation of the valve plug in the inner chamber 16 of the valve body.

As shown in FIGS. 2A, 2B, and 3, the valve body 1 includes a first valve seat 11 and a second valve seat 12 located in the longitudinal direction.

As shown on an enlarged scale in FIGS. 2A and 2B, the first valve seat 11 includes a first inclined surface 111 and a defining surface 17, along which the first inclined surface 11 can come into contact with the valve plug (not shown) to form a seal, thereby defining the surface 17 can define the opening together with the opposite defining surface (not shown), the opening and the valve plug (not shown) can set together different flows of the medium.

As shown on an enlarged scale in FIG. 3, the second valve seat 12 includes a second inclined surface 122 and a receiving surface 123, along which the second inclined surface 122 can come into contact with the valve plug (not shown) to form a seal, while the receiving surface 123 can set the opening together with the opposite surface (not shown) for receiving the valve plug, and the valve plug and the receiving surface 123 are located in the valve body 1 with a movable fit.

4A and 4B, valve plug 2 includes two protruding tides 29 located opposite on one side of the bottom of the plug, with protruding tides 29 protruding outward along a direction perpendicular to the axis and extend in a direction parallel to the axis. A gap 290 is formed between the two protruding tides 29, with two openings 28 open at the top of the valve plug 2 and the medium can flow into the valve plug 2 from the holes 28 when the valve plug 2 is located in the valve body (not shown).

In the enlarged scale of the valve plug portion 2 shown in FIG. 4, the valve plug 2 includes a distal surface 24 and a seating surface 23, wherein a second contact portion 22 of the valve plug 2 is formed between the distal surface 24 and the seating surface 23 and the position of the second contact portion 22 in the valve body is selected to provide contact with the second valve seat 12 to form a lower seal.

In particular, the second contact portion 22 may be a second contact surface 222 including an annular protrusion 20. To ensure the deformation of the protrusion after extrusion into the second valve seat 12, the protrusion 20 may be made of a material whose hardness is less than the hardness of the material of the valve seat 12, such as a seat 12 of the valve is made of cast iron, and the protrusion 20 is made of bronze. Since the hardness of bronze is less than the hardness of cast iron, when a certain pressure is applied to the valve plug 2, so that the protrusion 20 made of bronze is extruded into the valve seat 12 made of cast iron, slight plastic deformation of the protrusion 20 made of bronze can occur and deformed the protrusion can form a fit over the contact surface with the extruding surface, so that an improved sealing action between the contact surface and the second valve seat 12 is achieved.

The protrusion 20 may be a rectangular bulge, and the rectangular bulge includes a horizontal plane 203 and a vertical plane 202. When a certain pressure is applied, the rectangular edge between the horizontal plane 203 and the vertical plane 202 can be extruded into the valve seat 12, which facilitates the occurrence of deformation.

In another part of the valve plug 2 shown in an enlarged scale in FIG. 6, the valve plug 2 includes a first contact portion 21 connecting a seating surface 23 and a defining surface 27. In particular, the first contact portion 21 may be a first contact surface 211, wherein the position of the first the contact portion 21 in the valve body can be selected to make contact with the first valve seat 11, in particular, the upper seal is created by hard contact of the first contact surface 21 and the first valve seat 11. Thus, the first contact surface 211 can be substantially parallel to the first inclined surface of the first valve seat 11, and both surfaces are substantially parallel to each other to form a sealing surface in order to allow control of the leakage flow of the medium on the first contact surface 211 in the desired range in the closed position.

On figa and 7B schematically shows the pulling of the valve plug up to move the valve body to the closed position. On figa and 7B in the inner chamber 16 of the valve body through the upper hole 14 of the valve body 1 includes a valve stem 3, one end of which is connected to the valve plug 2, and the other end is connected to the actuator (not shown) using the connecting mechanism 4.

When the actuator drives the valve stem 3 to pull the valve plug 2 upward using the connecting mechanism 4 until it stops, the valve is in the closed position (as shown in FIGS. 7A and 7B). When the actuator drives the valve stem 3 to move the valve plug 2 downward using the connecting mechanism 4, the valve is in the open state (as shown in FIG. 11).

The following is a description of the relative positions of the valve plug 2 and the valve body 1 when the valve is in the closed state, with reference to FIGS. 8A, 8B, 9A and 9B.

As shown in FIGS. 8A and 9A, when the valve is in the closed state, the medium circulation between the valve body defining surface 17 and the valve plug defining surface 27 is blocked and the medium flowing from the valve plug holes 28 is also blocked due to the sealing contact between the second the contact part 22 and the second seat 12 of the valve closing the valve.

As shown in FIG. 8B, since a rigid contact seal exists between the first contact portion 21 of the valve plug 2 and the first seat 11 of the valve body, in particular since the first contact portion 21 of the valve plug includes a first contact surface 211 substantially parallel to the first inclined surface 111 of the first seat 11 of the valve, the hard contact of the two surfaces forms a sealing surface, and the sealing action leads to the fact that the flow of fluid leakage between the reference surface 17 of the valve body and the back the guide surface of the valve plug 27 can be controlled in a desired range.

As shown in figv, the thickening of the second contact surface 222 of the valve plug is easily deformed in the case of extrusion due to the low hardness of the material. Thus, after extrusion, a deformed protrusion 20 'is formed, and the protrusion 20' forms a thickened contact surface 200, almost parallel to the second inclined surface 122, due to extrusion using the second inclined surface 122 of the second valve seat 12. The sealing of the valve plug 2 and the second valve seat 12 can be implemented using a thickened contact surface 200 to control the flow of fluid leakage within the desired range.

Since the valve plug 2 needs to be moved up and down relative to the valve seat 11, 12, a fit may be provided with a gap between the seating surface 23 of the valve plug and one surface (i.e., receiving surface 123) of the second valve seat near the valve plug. Typically, the valve plug moves up or down.

In addition, to prevent rotation of the valve plug 2 in the valve body 1 and to adversely affect the sealing effect, the valve plug 2 includes at least one pair of protruding tides 29 located opposite and a gap 290 is formed between the protruding tides 29. As shown in FIG. 10A and 10B, the valve body 1 includes a locking part 19 aligned with the position of the slot 290, and the locking part 19 is able to at least partially protrude into the slot 290 to prevent rotation of the valve plug 2 in the valve body 1 and exceptionally negative effect on the sealing effect.

The locking part 19 may be made in the form of a protrusion, thickening, or the like. As an alternative solution, preventing the rotation of the valve plug 2 in the valve body 1 is also possible by providing a similar solution, for example, by making the locking part 19 in the form of a groove, while the protrusion is located, respectively, on the valve plug 2, which can enter the groove, while the expected prevention of rotation is realized due to the contact of the groove and the protrusion.

11 schematically shows a valve in a half-open state. As shown on an enlarged scale in FIGS. 12A and 12B, when the valve plug 2 moves downward relative to the valve seat 11, 12, since the first contact portion 21 of the valve plug 2 comes out of contact with the first valve seat 11, in particular since the first contact surface 211 the first contact part 21 of the valve plug is not in contact with the first inclined surface 111 of the first valve seat 11, then the sealing surface formed initially between the two surfaces due to the hard contact no longer exists, medium flows down between the defining surface 17 of the valve body and the defining surface 27 of the valve plug and the medium realizes the connection. The deformed protrusion 20 'may also be out of contact with the second inclined surface 122 of the second valve seat 12, and the valve plug 2 moves down along the seating surface 23.

The following is a description of a process for installing a valve plug according to one embodiment of the present invention in a valve body.

The valve plug extends into the inner chamber 16 of the valve body 1 through the lower hole 18 of the valve body 1 shown in FIG. 1, so that the valve body lock portion 19 can enter a slot formed by protruding tides of the valve plug.

The protrusion of the valve plug is made in particular so that there is a gap between the first inclined surface and the first contact surface when the valve plug enters the valve body and the protrusion comes into contact with the second inclined surface without applying an external force. When a certain external force is applied, the protrusion can be extruded using the second inclined surface; since the hardness of the protrusion material is less than the hardness of the material of the second inclined surface, the protrusion can be deformed to form a thickened contact surface that can be aligned with the second inclined surface, thereby forming a sealing surface between the thickened contact surface and the second inclined surface; accordingly, the gap between the first inclined surface and the first contact surface can be radically reduced to a minimum to provide improved sealing action of the hard contact. Thus, the valve plug is installed in the valve body.

It should be understood that the applied external force KN increases with the diameter of the valve plug, as shown in FIG. 13. That is, if the opening of the valve body DN is increased, then the diameter of the valve plug may increase, and the external force KN applied to the valve plug may increase, in order to deform the annular protrusion of the valve plug.

Since only the annular protrusion is located on the valve plug and the sealing effect of the valve plug and valve seat is formed by extrusion, there is no need for precise processing of the valve plug, so that the valve plug has a fit in contact with the valve seat. There is also no need to perform operations such as grinding the valve seat, and a good sealing action between the valve plug and the valve body can be achieved only by extruding the valve plug, which saves the processing cost.

It is clear that although this description is provided for various embodiments, this does not mean that each embodiment includes only one independent technical solution. This is done in the description for clarity only. Specialists in the art should consider the description as a whole, and the technical solutions in the embodiments may form other embodiments that are understood by those skilled in the art using suitable combinations.

The above description is only an example of embodiments and should not limit the scope of the invention. Any equivalent variations, modifications and combinations made by specialists in this field of technology without departing from the concept and principle of the invention should be included in the scope of protection of this invention.

LIST OF POSITIONS

1 valve body

11 First valve seat

111 first inclined surface

12 Second valve seat

112 Second inclined surface

123 receiving surface

14 Top hole

16 Inner chamber

17 Defining surface

18 bottom hole

19 Locking part

2 valve plug

29 protruding tide

290 slot

28 Valve plug holes

21 First contact part

22 Second contact part

23 Landing surface

24 Distal surface

20 Projection

20 'Deformed surface

222 Second contact surface

27 Defining surface

211 First contact surface

200 thickened contact surface

Claims (11)

1. Valve assembly containing:
valve body (1);
a valve seat (11, 12) located in the inner chamber (16) of the valve body (1), wherein the valve seat (11, 12) comprises a first valve seat (11) and a second valve seat (12) located in the longitudinal direction; and
a valve plug (2) adapted to move relative to the valve seat (11, 12), wherein the valve plug (2) comprises a first contact part (21) and a second contact part (22), wherein the first contact part (21) is made with the possibility of contact with the first valve seat (11) with the formation of a seal, the second contact part (22) contains an annular protrusion (20), while the protrusion (20) is made with the possibility of deformation after extrusion into the second valve seat (12), while the second the contact part (22) is configured to tneniya by contact with the second seat (12) of the valve via the deformed protrusion (20 ');
wherein the blocking part (19), designed to block the rotation of the valve plug (2), is located in the inner chamber (16) of the valve body (1). 2. The valve assembly according to claim 1, wherein the hardness of the protrusion material (20) is less than the hardness of the valve seat material (11, 12). 3. The valve assembly according to claim 2, in which the protrusion (20) is made of bronze, and the valve seat (11, 12) is made of cast iron. 4. The valve assembly according to any one of claims 1 or 2, wherein the first valve seat (11) comprises a first inclined surface (111), the first contact portion (21) of the valve plug (2) comprises a first contact surface (211), essentially parallel to the first inclined surface (111), and the first inclined surface (111) is designed to form a seal when it comes into contact with the first contact surface (211). 5. The valve assembly according to any one of claims 1 or 2, in which the second valve seat (12) comprises a second inclined surface (122), and the protrusion (20) of the valve plug is deformable after extrusion with a second inclined surface (122). 6. The valve assembly according to any one of claims 1 or 2, in which the protrusion (20) is located on the second contact surface (222), and the second contact surface (222) is essentially parallel to the first inclined surface (111). 7. The valve assembly according to any one of claims 1 or 2, in which the protrusion (20) is a rectangular thickening. 8. The valve assembly according to claim 7, wherein the protrusion (20) is intended to form a contact surface (200) after extrusion into the second valve seat (12), and the contact surface (200) is substantially parallel to the second inclined surface (122). 9. The valve assembly according to any one of claims 1 or 2, in which the protrusion (20) is made, in particular, so that there is a gap between the first inclined surface (111) and the first contact surface (211) when the protrusion (20) comes in contact with the second inclined surface (122) without the application of external force. 10. Valve assembly according to any one of claims 1 or 2, wherein the seating surface (23) between the first contact surface (211) and the second contact surface (222) and the surface (123) of the second valve seat (12) near the plug (2) valve is a movable fit. 11. The valve assembly according to any one of claims 1 or 2, in which the valve plug (2) contains at least one pair of protruding tides (29) located opposite, with a gap (290) between at least two protruding tides ( 29), and the blocking part (19) is capable of at least partially entering the slot (290).

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