A stop valve

Abstract

The utility model relates to valve technical field, concretely relates to stop valve. The stop valve, including: valve body, the medium passage has in the valve body, the medium passage includes first cavity and second cavity, still be provided with third cavity in the valve body, third cavity sets up between first cavity and second cavity, first cavity, second cavity and third cavity intercommunication, valve rod, valve rod set up in third cavity movable, valve clack, valve clack sets up in valve rod one end close to medium passage, pressure relief hole, pressure relief hole sets up in the valve body, and the both ends of pressure relief hole are linked together with third cavity and second cavity, and the medium in third cavity can flow to second cavity in pressure relief hole to complete pressure relief, and the stop valve of the application realizes self pressure relief function, guarantees the stability and reliability of valve body.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a gate valve. Background Technology

[0002] Gate valves are widely used in long-distance pipelines, petrochemical, storage facilities, thermal power plants and other industries due to their low flow resistance, high sealing performance, flexible operation, corrosion resistance and high pressure and high temperature resistance.

[0003] Gate valves often fail to open the medium passage in time due to excessive internal pressure. Therefore, in order to ensure the safe use of the valve, pressure relief holes are usually drilled on the surface of the valve body and a bypass pipeline is connected to it to release pressure on the valve body during the process of opening the medium passage, so that the valve body can open the medium passage in time. However, drilling pressure relief holes on the surface of the valve body will cause external leakage points in the valve body, resulting in poor sealing performance. Utility Model Content

[0004] In view of this, the present invention provides a shut-off valve to solve the problem that drilling pressure relief holes on the valve body surface will cause external leakage points in the valve body, resulting in poor sealing performance.

[0005] This utility model provides a shut-off valve, comprising:

[0006] The valve body has a medium channel, which includes a first cavity and a second cavity. The valve body also has a third cavity, which is located between the first cavity and the second cavity. The first cavity, the second cavity and the third cavity are interconnected.

[0007] A valve stem, which is movably disposed within the third cavity;

[0008] A valve disc, wherein the valve disc is disposed at one end of the valve stem near the medium passage;

[0009] A pressure relief hole is provided in the valve body. The two ends of the pressure relief hole are respectively connected to the third cavity and the second cavity. The medium in the third cavity can flow into the second cavity through the pressure relief hole to complete the pressure relief.

[0010] In one optional embodiment, the third cavity is coaxially arranged with the connection between the first cavity and the second cavity, the connection between the first cavity and the second cavity has a sealing surface, the valve disc is adapted to extend into the connection between the first cavity and the second cavity and fit tightly with the sealing surface to cut off the medium, and both the surface of the valve disc and the sealing surface are provided with a wear-resistant structure.

[0011] In one optional embodiment, the valve disc has an inverted conical sealing head, and the connection between the first cavity and the second cavity has an inverted conical hole. The sealing head fits tightly with the inverted conical hole, and the contact surface between the inverted conical hole and the valve disc is the sealing surface. The surface of the sealing head has a wear-resistant structure.

[0012] In one alternative embodiment, the wear-resistant structure is a Stellite cemented carbide layer.

[0013] In one optional embodiment, the third cavity includes a valve stem running cavity and a valve cover assembly cavity. One end of the valve stem running cavity is connected to the first cavity and the second cavity, and the other end of the valve stem running cavity is connected to the valve cover assembly cavity. The valve cover assembly cavity is connected to the second cavity through the pressure relief hole. The valve disc is disposed in the valve stem running cavity, and the valve stem is disposed in the valve cover assembly cavity. One end of the valve stem extends into the valve stem running cavity and connects to the valve disc.

[0014] In one optional embodiment, the diameter of the valve stem running cavity is smaller than the diameter of the valve cover assembly cavity, and the valve disc is clearance-fitted with the inner wall of the valve stem running cavity.

[0015] In one optional embodiment, the valve stem running chamber and the valve cover assembly chamber are coaxially arranged.

[0016] In one alternative embodiment, a valve cover is disposed within the valve cover assembly cavity, the valve cover being adapted to close the valve cover assembly cavity.

[0017] In one alternative embodiment, the other end of the valve stem extends through the valve cover to protrude from the valve cover mounting cavity. The valve cover has a through hole for the valve stem to pass through, and a seal is provided within the through hole, the seal being located between the valve stem and the inner wall of the through hole.

[0018] In one alternative embodiment, a sealing assembly is provided between the valve cover and the inner wall of the valve cover assembly cavity.

[0019] Beneficial effects:

[0020] 1. This utility model provides a shut-off valve. By setting a pressure relief hole in the valve body and connecting the second and third cavities through the pressure relief hole, the medium in the third cavity can enter the second cavity through the pressure relief hole to complete the pressure relief, thus realizing the self-pressure relief function, ensuring the stability and reliability of the valve body, and avoiding the problem of external leakage points caused by drilling pressure relief holes in the valve body. The valve body without drilling pressure relief holes will have better sealing performance.

[0021] 2. In the gate valve of this utility model, both the surface of the valve disc and the sealing surface are provided with wear-resistant structures. The wear-resistant structures can effectively improve the wear resistance and corrosion resistance of the valve disc and the sealing surface, and ensure the sealing effect of the valve body. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a shut-off valve according to an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 A magnified view of part A in the diagram.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Valve body; 101. First cavity; 102. Second cavity; 103. Third cavity; 1031. Valve stem running cavity; 1032. Valve cover assembly cavity; 2. Valve stem; 3. Valve disc; 301. Sealing head; 4. Pressure relief hole; 5. Sealing surface; 6. Wear-resistant structure; 7. Inverted conical hole; 8. Valve cover; 9. Sealing element; 10. Sealing assembly. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The following is combined Figure 1 and Figure 2 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, a shut-off valve is provided, comprising: a valve body 1, a valve stem 2, a valve disc 3, and a pressure relief hole 4.

[0030] Specifically, the valve body 1 has a medium channel, including a first cavity 101 and a second cavity 102. A third cavity 103 is also provided within the valve body 1, positioned between the first and second cavities 101 and 102. The first, second, and third cavities 101 and 102 are interconnected. The valve stem 2 is movably disposed within the third cavity 103. The valve disc 3 is located at the end of the valve stem 2 closest to the medium channel. A pressure relief hole 4 is located within the valve body 1, with its two ends communicating with the third cavity 103 and the second cavity 102, respectively. The medium within the third cavity 103 can flow through the pressure relief hole 4 into the second cavity 102 to release pressure.

[0031] In this embodiment, the valve body 1 is a one-piece forging, and the medium channel includes a first cavity 101 and a second cavity 102. Figure 1 In this structure, the left end of the first cavity 101 is the medium inlet, and the right end of the second cavity 102 is the medium outlet. The first cavity 101, the second cavity 102, and the third cavity 103 are interconnected. The valve stem 2 in the third cavity 103 can drive the valve disc 3 to extend from the third cavity 103 into the connection between the first cavity 101 and the second cavity 102, thereby closing the medium channel and cutting off the flow of the medium. The third cavity 103 also contains the medium. When it is necessary to open the medium channel, the valve stem 2 is moved by external force, so that the valve stem 2 drives the valve disc 3 to move into the third cavity 103. The medium in the third cavity 103 will flow into the second cavity 102 through the pressure relief hole 4, thereby completing the pressure relief in the third cavity 103 and reducing the resistance of the medium in the third cavity 103 to the valve disc 3.

[0032] It should be noted that when the medium passage needs to be closed, the valve stem 2 is moved by external force, causing the valve stem 2 to move the valve disc 3 and extend it out from the third chamber 103. A negative pressure is generated in the third chamber 103, and the pressure relief hole 4 will draw the medium in the second chamber 102 into the third chamber 103. The valve disc 3 and the third chamber 103 are in clearance fit. When the valve disc 3 closes the medium passage, the medium in the third chamber 103 can flow into the second chamber 102 through the gap between the valve disc 3 and the third chamber 103 and the pressure relief hole 4, preventing the third chamber 103 from being pressurized and ensuring the safety of the valve. When the medium passage needs to be opened, the medium in the third chamber 103 will quickly flow into the second chamber 102 through the pressure relief hole 4 to achieve rapid pressure relief and ensure that the valve can be opened quickly.

[0033] By setting a pressure relief hole 4 inside the valve body 1 and connecting the second cavity 102 and the third cavity 103 through the pressure relief hole 4, the medium in the third cavity 103 can enter the second cavity 102 through the pressure relief hole 4 to complete the pressure relief, thus realizing the self-pressure relief function, ensuring the stability and reliability of the valve body 1, and avoiding the problem of external leakage points in the valve body caused by drilling a pressure relief hole. The valve body without a pressure relief hole will have better sealing performance.

[0034] In one embodiment, the third cavity 103 is coaxially arranged with the connection between the first cavity 101 and the second cavity 102. The connection between the first cavity 101 and the second cavity 102 has a sealing surface 5. The valve disc 3 is adapted to extend into the connection between the first cavity 101 and the second cavity 102 and fit tightly with the sealing surface 5 to cut off the medium. Both the surface of the valve disc 3 and the sealing surface 5 are provided with wear-resistant structures 6.

[0035] In this embodiment, as Figure 1 and Figure 2 As shown, the third cavity 103 is coaxially arranged with the first cavity 101 and the second cavity 102. The valve disc 3 can be moved by the valve stem 2 to the connection between the first cavity 101 and the second cavity 102 to tightly cooperate with the sealing surface 5 to cut off the medium. The surface of the valve disc 3 and the sealing surface 5 are both provided with wear-resistant structure 6. The wear-resistant structure 6 can effectively improve the wear resistance and corrosion resistance of the valve disc 3 and the sealing surface 5, and ensure the sealing effect of the valve body 1.

[0036] Preferably, in this embodiment, the wear-resistant structure 6 is a Stellite cemented carbide layer.

[0037] In one embodiment, the valve disc 3 has an inverted conical sealing head 301, and the connection between the first cavity 101 and the second cavity 102 has an inverted conical hole 7. The sealing head 301 is tightly fitted with the inverted conical hole 7, and the contact surface between the inverted conical hole 7 and the valve disc 3 is the sealing surface 5. The surface of the sealing head 301 has a wear-resistant structure 6.

[0038] In this embodiment, as Figure 1 and Figure 2 As shown, the valve disc 3 has a sealing head 301 at one end facing the first cavity 101 and the second cavity 102. The sealing head 301 has an inverted conical structure. The connection between the first cavity 101 and the second cavity 102 has an inverted conical hole 7. The sealing head 301 can be moved by the valve stem 2 and extends into the inverted conical hole 7 to tightly seal the medium passage. The inner surface of the inverted conical hole 7 is the sealing surface 5. The end face of the sealing head 301 that tightly fits with the sealing surface 5 is provided with a Stellite hard alloy layer. When the medium passage is open, the medium can enter the second cavity 102 through the first cavity 101 and the inverted conical hole 7.

[0039] In one embodiment, the third cavity 103 includes a valve stem running cavity 1031 and a valve cover assembly cavity 1032. One end of the valve stem running cavity 1031 is connected to the first cavity 101 and the second cavity 102, and the other end of the valve stem running cavity 1031 is connected to the valve cover assembly cavity 1032. The valve cover assembly cavity 1032 is connected to the second cavity 102 through a pressure relief hole 4. The valve disc 3 is disposed in the valve stem running cavity 1031, and the valve stem 2 is disposed in the valve cover assembly cavity 1032. One end of the valve stem 2 extends into the valve stem running cavity 1031 and connects with the valve disc 3.

[0040] In this embodiment, as Figure 1 As shown, the valve stem 2 is located in the valve cover assembly cavity 1032, and the lower end of the valve stem 2 extends into the valve stem running cavity 1031. The valve disc 3 is located in the valve stem running cavity 1031, and the lower end of the valve stem 2 is connected to the valve disc 3. The valve disc 3 can extend or extend into the valve stem running cavity 1031 through the valve stem 2.

[0041] In this embodiment, as Figure 1 As shown, the diameter of the valve stem running chamber 1031 is smaller than the diameter of the valve cover assembly chamber 1032, and the valve disc 3 is clearance-fitted with the inner wall of the valve stem running chamber 1031. The medium in the valve cover assembly chamber 1032 can flow into the second chamber 102 through the gap between the valve disc 3 and the valve stem running chamber 1031 and the pressure relief hole 4, preventing pressure buildup in the third chamber 103 and ensuring valve safety. When the medium passage is opened, the medium in the valve cover assembly chamber 1032 will quickly flow into the second chamber 102 through the pressure relief hole 4, achieving rapid pressure relief and ensuring that the valve can open quickly.

[0042] In this embodiment, as Figure 1 As shown, the valve stem running chamber 1031 and the valve cover assembly chamber 1032 are coaxially arranged, which can ensure the coaxiality of the valve disc 3 and the valve stem 2 and avoid problems such as jamming and bending caused by the valve stem 2 being misaligned.

[0043] In this embodiment, as Figure 1 As shown, a valve cover 8 is provided inside the valve cover assembly cavity 1032. The valve cover 8 is suitable for sealing the valve cover assembly cavity 1032 to ensure the sealing performance of the valve cover assembly cavity 1032.

[0044] In this embodiment, as Figure 1 As shown, the other end of the valve stem 2 passes through the valve cover 8 and extends out of the valve cover assembly cavity 1032. The valve cover 8 has a through hole for the valve stem 2 to pass through, and a sealing element 9 is located inside the through hole. The sealing element 9 is located between the valve stem 2 and the inner wall of the through hole. The other end of the valve stem 2 extends out of the valve cover assembly cavity 1032 and is connected to the drive assembly. The drive assembly can drive the valve stem 2 to perform lifting and lowering movements. The drive assembly can be a motor, handwheel, etc. Preferably, the sealing element 9 is a sealing ring.

[0045] In this embodiment, as Figure 1As shown, a sealing assembly 10 is provided between the valve cover 8 and the inner wall of the valve cover assembly cavity 1032. The sealing assembly 10 includes a sealing ring and a gland. The gland can apply pressure to the sealing ring to limit and fix the sealing ring.

[0046] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A stop valve characterized by comprising: include: The valve body (1) has a medium channel, which includes a first cavity (101) and a second cavity (102). The valve body (1) also has a third cavity (103), which is located between the first cavity (101) and the second cavity (102). The first cavity (101), the second cavity (102) and the third cavity (103) are interconnected. Valve stem (2), which is movably disposed within the third cavity (103); Valve disc (3), the valve disc (3) is disposed at one end of the valve stem (2) near the medium channel; Pressure relief hole (4) is provided in the valve body (1). The two ends of the pressure relief hole (4) are respectively connected to the third cavity (103) and the second cavity (102). The medium in the third cavity (103) can flow to the second cavity (102) through the pressure relief hole (4) to complete the pressure relief.

2. The stop valve according to claim 1, characterized by The third cavity (103) is coaxially arranged with the first cavity (101) and the second cavity (102) at their connection points. The connection points of the first cavity (101) and the second cavity (102) have a sealing surface (5). The valve disc (3) is adapted to extend into the connection points of the first cavity (101) and the second cavity (102) and fit tightly with the sealing surface (5) to cut off the medium. The surface of the valve disc (3) and the sealing surface (5) are both provided with wear-resistant structures (6).

3. The shut-off valve according to claim 2, characterized in that The valve disc (3) has an inverted conical sealing head (301), and an inverted conical hole (7) is provided at the connection between the first cavity (101) and the second cavity (102). The sealing head (301) is in close fit with the inverted conical hole (7), and the contact surface between the inverted conical hole (7) and the valve disc (3) is the sealing surface (5). The surface of the sealing head (301) has a wear-resistant structure (6).

4. The shut-off valve according to claim 2 or 3, characterized in that The wear-resistant structure (6) is a Stellite hard alloy layer.

5. The shut-off valve according to claim 1, characterized in that The third cavity (103) includes a valve stem running cavity (1031) and a valve cover assembly cavity (1032). One end of the valve stem running cavity (1031) is connected to the first cavity (101) and the second cavity (102), and the other end of the valve stem running cavity (1031) is connected to the valve cover assembly cavity (1032). The valve cover assembly cavity (1032) is connected to the second cavity (102) through the pressure relief hole (4). The valve disc (3) is disposed in the valve stem running cavity (1031), and the valve stem (2) is disposed in the valve cover assembly cavity (1032). One end of the valve stem (2) extends into the valve stem running cavity (1031) and connects with the valve disc (3).

6. The shut-off valve according to claim 5, characterized in that The diameter of the valve stem running cavity (1031) is smaller than the diameter of the valve cover assembly cavity (1032), and the valve disc (3) is clearance-fitted with the inner wall of the valve stem running cavity (1031).

7. The shut-off valve according to claim 5 or 6, characterized in that The valve stem running cavity (1031) and the valve cover assembly cavity (1032) are coaxially arranged.

8. The shut-off valve according to claim 5, characterized in that, A valve cover (8) is provided inside the valve cover assembly cavity (1032), and the valve cover (8) is adapted to close the valve cover assembly cavity (1032).

9. The shut-off valve according to claim 8, characterized in that The other end of the valve stem (2) passes through the valve cover (8) to extend out of the valve cover assembly cavity (1032). The valve cover (8) has a through hole for the valve stem (2) to pass through. A seal (9) is provided in the through hole. The seal (9) is located between the valve stem (2) and the inner wall of the through hole.

10. The shut-off valve according to claim 8 or 9, characterized in that A sealing assembly (10) is provided between the valve cover (8) and the inner wall of the valve cover assembly cavity (1032).

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