Valve capable of improving sealing performance

Abstract

The utility model relates to the technical field of valve sealing, in particular to a valve capable of improving sealing performance, which comprises a valve body and a valve seat, a valve cavity and a valve seat mounting groove communicated with the valve cavity are arranged in the valve body, one end of the valve seat is matched with the valve seat mounting groove in a locking mode, the other end of the valve seat extends into the valve cavity, and a sealing adjusting piece is arranged on the outer wall of the valve seat. A pressed surface is arranged in the valve seat mounting groove, and when the valve seat and the valve seat mounting groove are locked and matched, the sealing adjusting piece abuts against the pressed surface, so that the valve seat and the valve body are matched in a sealing mode. When the valve seat in the valve is in threaded locking fit with the valve seat mounting groove, large-area sealing is completed between the valve seat and the valve body so as to form initial sealing, meanwhile, the sealing adjusting piece on the outer wall of the valve seat abuts against the pressed face, and when the valve seat continues to move towards the limiting groove, the valve seat can be sealed. The counter-acting force of the pressed face enables the sealing adjusting piece to expand so that linear sealing can be formed between the sealing adjusting piece and the valve seat installation groove, and double sealing is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of valve sealing technology, specifically a valve that improves sealing performance. Background Technology

[0002] Gate valves are among the most widely used valve types. Depending on the application conditions, gate valves come in a wide range of diameters, from DN20 to DN1000. Different sizes of gate valves have diverse structures and performance characteristics to adapt to different operating conditions and production processes. For gate valves designed with a separate seat, there are various connection structures between the seat and the valve body, all serving the same purpose: to achieve reliable fixation and sealing, ensuring the valve's sealing performance. However, the seat structure also has a certain range of applicability for different valve sizes.

[0003] For large-diameter gate valves, the valve seat can be either fixed to the valve body or a floating valve seat. However, for small-diameter gate valves, due to the limited space, it is difficult to operate by welding the valve seat to the valve body. Floating valve seats are also difficult to install. Therefore, a valve seat structure that is inexpensive to operate and has reliable sealing is needed. Thus, there is an urgent need to design a valve with improved sealing performance to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a valve with improved sealing performance, which solves the problems mentioned above, such as the small space of small-diameter gate valves, the difficulty of operation when choosing to weld the valve seat to the valve body, and the difficulty of installation when using a floating valve seat.

[0005] To solve the above-mentioned technical problems, this utility model provides a valve with improved sealing performance, including a valve body and a valve seat. The valve body has a valve cavity and a valve seat mounting groove communicating with the valve cavity. One end of the valve seat is locked with the valve seat mounting groove, and the other end extends into the valve cavity. A sealing adjustment element is provided on the outer wall of the valve seat, and a pressure-bearing surface is provided in the valve seat mounting groove. The sealing adjustment element abuts against the pressure-bearing surface, so that the valve seat and the valve body are sealed together.

[0006] Furthermore, the valve seat mounting groove includes a first sealing section and a first mounting section arranged sequentially away from the valve cavity, the intersection of the first sealing section and the first mounting section forms the pressure-bearing surface, and the valve seat has a second mounting section that mates with and connects to the first mounting section.

[0007] Furthermore, the first mounting section and the second mounting section are threadedly connected, and the external thread of the second mounting section and the internal thread of the first mounting section are both fine threads.

[0008] Furthermore, the other end of the valve seat extending into the valve cavity is provided with a turning section, the vertical cross-section of the turning section is polygonal, and the sealing adjustment element is disposed between the turning section and the second mounting section.

[0009] Furthermore, the sealing adjustment element is a lip ring, the wall of which is inclined from the inside out toward the direction away from the valve cavity, and surrounds the outer wall of the valve seat.

[0010] Furthermore, the outer side of the lip ring has an arc surface that extends to the end face of the lip ring near the inner wall of the first sealing section. When the valve seat is locked in place with the valve seat mounting groove, the arc surface expands under the opposing force of the pressure surface, causing the arc surface to abut against the inner wall of the first sealing section to form a line seal.

[0011] Furthermore, the valve is a gate valve, and the gate valve is provided with two parallel gate plates. An elastic component is provided between the two gate plates. There are two valve seat mounting slots in the valve body, and the two valve seat mounting slots are symmetrically arranged on both sides of the two gate plates. Each valve seat mounting slot is equipped with a corresponding valve seat. The two gate plates abut against the valve seat through the elastic component.

[0012] Furthermore, a limiting groove is provided on the side of the first installation section away from the first sealing section.

[0013] Furthermore, a clearance groove is provided between the lip ring and the second mounting section.

[0014] Furthermore, the sealing adjustment component and the valve seat are integrally formed.

[0015] The beneficial effects of this utility model are as follows: When the valve seat in the valve of this utility model is locked in place with the valve seat mounting groove by the thread, a large area seal is formed between the valve seat and the valve body to form an initial seal. At the same time, the sealing adjustment element on the outer wall of the valve seat abuts against the pressure surface. When the valve seat continues to move towards the limiting groove, the reaction force of the pressure surface causes the sealing adjustment element to expand to form a line seal with the valve seat mounting groove, so as to achieve a double seal. When the valve is in use, the greater the pressure in the valve body and valve cavity or the squeezing force of the double gate, the more the sealing adjustment element will be pressed against the pressure surface, so that the sealing effect between the valve seat and the valve body is better.

[0016] The internal threads of the first mounting section and the external threads of the second mounting section are both designed with fine threads, which allows the valve seat to fit more tightly with the valve body under the driving force of the high-pressure medium, so as to maximize the sealing performance between the valve seat and the valve body.

[0017] The design of the limiting groove on one side of the first installation section allows the valve seat to have room to move and allows the lip ring on the outer wall of the valve seat to have room to expand, so that the arc surface of the lip ring can achieve a good seal between the pressure surface and the inner wall of the first sealing section.

[0018] The valve seat has a rotating section and a second mounting section. The rotating section of the valve seat can be rotated with a special tool, so that the second mounting section of the valve seat can be screwed into the first mounting section of the valve seat mounting groove. At the same time, while rotating, a squeezing force is applied to the lip ring and the pressure surface, so that the lip ring can expand. The rotating section of the valve seat adopts a polygonal design, which can better limit the rotation of the rotating section and reduce the risk of slippage when rotating the valve seat.

[0019] The clearance groove between the lip ring and the second mounting section ensures that the expanding lip ring is not obstructed and can seal to the maximum extent with the pressure surface and the inner wall of the first sealing section. The two sides of the arc surface of the lip ring make double contact seals with the pressure surface and the inner wall of the first sealing section respectively. The contact force generates contact specific pressure to generate a sealing line, thereby achieving the sealing between the valve seat and the valve body.

[0020] The sealing adjustment component and the valve seat are integrally molded, which can prevent the sealing adjustment component from being squeezed and deviated during sealing, thereby improving the sealing performance of the valve seat and the service life of the valve. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of a valve with improved sealing performance according to an embodiment of this utility model;

[0023] Figure 2 This is a partially enlarged view of a valve for improving sealing performance according to an embodiment of this utility model;

[0024] Figure 3 This is a cross-sectional view of the valve seat of a valve for improving sealing performance according to an embodiment of this utility model;

[0025] Figure 4 This is a left view of the valve seat of a valve for improving sealing performance according to an embodiment of this utility model;

[0026] In the diagram: 1-valve body, 2-valve seat, 3-sealing adjustment component, 4-double gate, 12-valve cavity, 13-valve seat mounting groove, 21-twisting section, 23-second mounting section, 24-avoiding groove, 31-arc surface, 41-elastic component, 131-pressure-bearing surface, 132-first sealing section, 133-first mounting section, 135-limiting groove. Detailed Implementation

[0027] The technical solutions in 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, and 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 will describe a specific embodiment of this utility model and its appendix. Figure 1-4 The present invention discloses a valve for improving sealing performance, comprising a valve body 1 and a valve seat 2. The valve body 1 has a valve cavity 12 and a valve seat mounting groove 13 communicating with the valve cavity 12. One end of the valve seat 2 is locked in place with the valve seat mounting groove 13, and the other end extends into the valve cavity 12. A sealing adjustment element 3 is provided on the outer wall of the valve seat 2. A pressure-bearing surface 131 is provided in the valve seat mounting groove 13. The sealing adjustment element 3 abuts against the pressure-bearing surface 131, so that the valve seat 2 and the valve body 1 are sealed in place.

[0029] The valve seat mounting groove 13 includes a first sealing section 132 and a first mounting section 133 arranged sequentially in the direction away from the valve cavity 12. The intersection of the first sealing section 132 and the first mounting section 133 forms a pressure-bearing surface 131. A limiting groove 135 is provided on the side of the first mounting section 133 away from the first sealing section 132. The design of the limiting groove 135 on the side of the first mounting section 133 allows the valve seat 2 to have room to move and allows the lip ring on the outer wall of the valve seat 2 to have an expansion allowance, so that the arc surface of the lip ring and the pressure-bearing surface 131 and the inner wall of the first sealing section 132 achieve a good seal.

[0030] The intersection of the first sealing section 132 and the first mounting section 133 forms a pressure-bearing surface 131. The first sealing section 132, the first mounting section 133, the pressure-bearing surface 131, and the limiting groove 135 constitute a stepped hole. The valve seat 2 has a second mounting section 23 that mates with the first mounting section 133. The first mounting section 133 and the second mounting section 23 are threaded together. The external thread of the second mounting section 23 and the internal thread of the first mounting section 133 are both fine threads. The design that the internal thread of the first mounting section 133 of the valve seat mounting groove 13 and the external thread of the second mounting section 23 of the valve seat 2 are both fine threads allows the valve seat 2 to fit more tightly with the valve body 1 under the driving force of the high-pressure medium, thereby maximizing the sealing performance between the valve seat 2 and the valve body 1.

[0031] The other end of the valve seat 2 that extends into the valve cavity 12 is provided with a twisting section 21. The vertical cross section of the twisting section 21 is polygonal. The sealing adjustment element 3 is disposed between the twisting section 21 and the second mounting section 23. In this embodiment, the polygon is preferably six sides. The valve seat 2 can be rotated by rotating the twisting section 21 with a special tool, so that the second mounting section 23 of the valve seat 2 is screwed into the first mounting section 133 of the valve seat mounting groove 13. At the same time, while twisting, a squeezing force is applied to the lip ring and the pressure surface 131 so that the lip ring can expand. The twisting section of the valve seat 2 adopts a polygonal design, which can make the twisting section 21 better limit the position and reduce the risk of slippage when the valve seat 2 is twisted.

[0032] The sealing adjustment element 3 is a lip ring. The wall of the lip ring is inclined from the inside to the outside in the direction away from the valve cavity 12 and is arranged around the outer wall of the valve seat 2. The sealing adjustment element 3 and the valve seat 2 are integrally formed. The integrally formed structure of the sealing adjustment element 3 and the valve seat 2 can prevent the lip ring from being squeezed and deviated during sealing, so as to improve the sealing performance of the valve seat 2 and the service life of the valve.

[0033] The outer side of the lip ring has an arc surface 31, which extends to the end face of the lip ring near the inner wall of the first sealing section 132. When the valve seat 2 is locked in place with the valve seat mounting groove 13, the arc surface 31 expands under the opposing force of the pressure surface 131, so that the arc surface 31 abuts against the inner wall of the first sealing section 132 to form a line seal.

[0034] The valve is a gate valve, which has two parallel gate plates 4 inside. An elastic component 41 is provided between the two gate plates 4. There are two valve seat mounting slots 13 in the valve body 1, and the two valve seat mounting slots 13 are symmetrically arranged on both sides of the two gate plates 4. A valve seat 2 is installed in each valve seat mounting slot 13. The two gate plates 4 abut against the valve seat 2 through the elastic component 41.

[0035] A lip ring is positioned between the turning section 21 and the second mounting section 23. A clearance groove 24 is provided between the lip ring and the second mounting section 23. The clearance groove 24 between the lip ring and the second mounting section 23 ensures that the expanding lip ring is not obstructed and can achieve maximum sealing with the pressure surface 131 and the inner wall of the first sealing section 132. The two sides of the arc surface 31 of the lip ring make double contact sealing with the pressure surface 131 and the inner wall of the first sealing section 132 respectively. The contact force generates a contact specific pressure to generate a sealing line, thereby achieving sealing between the valve seat and the valve body.

[0036] When the valve seat 2 in the valve of this utility model is threadedly locked with the valve seat mounting groove 13, a large-area seal is formed between the valve seat 2 and the valve body 1 to form an initial seal. At the same time, the sealing adjustment element 3 on the outer wall of the valve seat 2 abuts against the pressure surface 131. When the valve seat 2 continues to move towards the limiting groove 135, the reaction force of the pressure surface 131 causes the sealing adjustment element 3 to expand to form a line seal with the valve seat mounting groove 13, so as to achieve a double seal. When the valve is in use, the greater the pressure in the valve cavity 12 of the valve body 1 or the squeezing force of the double gate 4, the more the sealing adjustment element 3 will be pressed against the pressure surface 131, so that the sealing effect between the valve seat 2 and the valve body 1 is better.

[0037] The working process of this utility model:

[0038] Valve seat sealing installation method:

[0039] After aligning one end of the second mounting section 23 of each valve seat 2 with the opening of the first sealing section 132 of the valve seat mounting groove 13, screw it into the first mounting section 133 of the valve seat mounting groove 13 of the valve body 1. Use a special tool to rotate the screwing section 21 of the valve seat 2 into the valve seat mounting groove 13. When the first mounting section 133 of the valve seat mounting groove 13 and the second mounting section 23 of the valve seat 2 are screwed together, the lip ring on the outer wall of the valve seat 2 abuts against the pressure surface 131, so that a large-area seal is completed between the valve seat 2 and the valve body 1, thus forming an initial seal.

[0040] The special tool continues to rotate the turning section 21 of the valve seat 2, causing the end face of the second mounting section 23 of the valve seat 2 to move towards the limiting groove 135. The lip ring on the outer wall of the valve seat 2 expands to both sides under the rotational force of the valve seat 2 and the valve seat mounting groove 13, and the reverse extrusion force of the pressure surface 131. This causes the arc surface 31 of the lip ring to abut against the inner wall of the first sealing section 132, forming a line seal. The two sides of the end face of the lip ring away from the root form a double seal with the pressure surface 131 and the inner wall of the first sealing section 132, respectively. Stop the rotation with a tool. The valve seat 2 is now installed. When in use, the greater the pressure in the valve body 1 valve cavity 12 or the greater the squeezing force of the double gate, the more the sealing adjustment element 3 will be pressed against the pressure surface 131. This reduces the gap between the external threads on the valve seat 2 and the internal threads in the first mounting section 133 of the valve seat mounting groove 13, resulting in a better sealing effect between the valve seat 2 and the valve body 1. This is to meet the requirements of high temperature and high pressure operating environments and also allows the valve seat 2 to be disassembled, thereby improving the replaceability of the valve seat 2 and extending the service life of the valve.

[0041] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A valve with improved sealing performance, characterized in that, The valve includes a valve body (1) and a valve seat (2). The valve body (1) has a valve cavity (12) and a valve seat mounting groove (13) communicating with the valve cavity (12). One end of the valve seat (2) is locked with the valve seat mounting groove (13), and the other end extends into the valve cavity (12). A sealing adjustment element (3) is provided on the outer wall of the valve seat (2). A pressure-bearing surface (131) is provided in the valve seat mounting groove (13). The sealing adjustment element (3) abuts against the pressure-bearing surface (131) to make the valve seat (2) and the valve body (1) seal together.

2. The valve for improving sealing performance according to claim 1, characterized in that, The valve seat mounting groove (13) includes a first sealing section (132) and a first mounting section (133) arranged sequentially in the direction away from the valve cavity (12). The intersection of the first sealing section (132) and the first mounting section (133) forms the pressure surface (131). The valve seat (2) has a second mounting section (23) that is connected to the first mounting section (133).

3. The valve for improving sealing performance according to claim 2, characterized in that, The first mounting section (133) is threadedly connected to the second mounting section (23), and the external thread of the second mounting section (23) and the internal thread of the first mounting section (133) are both fine threads.

4. The valve for improving sealing performance according to claim 2, characterized in that, The valve seat (2) extends into the valve cavity (12) at the other end and has a rotating section (21). The vertical cross section of the rotating section (21) is polygonal. The sealing adjustment member (3) is disposed between the rotating section (21) and the second mounting section (23).

5. A valve for improving sealing performance according to any one of claims 2 to 4, characterized in that, The sealing adjustment element (3) is a lip ring. The wall of the lip ring is inclined from the inside to the outside in the direction away from the valve cavity (12) and is arranged around the outer wall of the valve seat (2).

6. A valve for improving sealing performance according to claim 5, characterized in that, The outer side of the lip ring has an arc surface (31), which extends to the end face of the lip ring near the inner wall of the first sealing section (132). When the valve seat (2) is locked in place with the valve seat mounting groove (13), the arc surface (31) expands under the opposing force of the pressure surface (131), causing the arc surface (31) to abut against the inner wall of the first sealing section (132) to form a line seal.

7. The valve for improving sealing performance according to claim 1, characterized in that, The valve is a gate valve, and the gate valve is provided with parallel double gate plates (4). An elastic component (41) is provided between the double gate plates (4). There are two valve seat mounting slots (13) in the valve body (1), and the two valve seat mounting slots (13) are symmetrically arranged on both sides of the double gate plates (4). Each valve seat mounting slot (13) is equipped with a corresponding valve seat (2). The double gate plates (4) abut against the valve seat (2) through the elastic component (41).

8. A valve for improving sealing performance according to claim 2, characterized in that, The first mounting section (133) has a limiting groove (135) on the side away from the first sealing section (132).

9. A valve for improving sealing performance according to claim 6, characterized in that, A clearance groove (24) is provided between the lip ring and the second mounting section (23).

10. A valve for improving sealing performance according to claim 5, characterized in that, The sealing adjustment component (3) and the valve seat (2) are integrally formed.

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