A seal seat and ball valve
Patent Information
- Application Number
- CN202522464758.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-20
AI Technical Summary
仅采用软密封时，即在阀座和球体之间设置橡胶件作为密封副，具有良好的密封性能，但是橡胶件的耐腐蚀性和耐高温性能一般，在高温工作环境下，容易发生损坏或腐蚀，使用寿命相对较短；仅采用硬密封时，即在阀座和球体之间采用堆焊或喷涂各种硬质合金作为密封面，具有良好的耐腐蚀性能，但是密封性能有所欠缺
[0022]本实用新型提出一种密封阀座，设置在阀体和球体之间，且能够与球体抵接以实现密封，密封阀座具体包括阀座本体、第一密封件、第二密封件、第一弹性件和第二弹性件，阀座本体沿第一方向延伸，且阀座本体朝向球体的一侧上设置有第一密封件，第一密封件与球体的表面刚性抵接，实现密封阀座与球体之间的初级硬密封，阀座本体朝向球体的一侧还设置有轴线沿第一方向延伸的第一容纳槽，第二密封件位于第二容纳槽内，且第二密封件与球体的表面柔性抵接，实现密封阀座与球体之间的次级软密封；第一弹性件位于第一容纳槽内且位于第一容纳槽的槽底和第二密封件之间，用于沿第一方向去推动第二密封件，使得第二密封件始终紧贴球体，第二弹性件位于阀体和阀座本体之间，用于沿第一方向推动阀座本体，使得第一密封件始终紧贴球体。其中，第一密封件与球体的表面刚性抵接，利用第一密封件的自身刚性确保第一密封件与的球体表面的紧密接触，实现硬性密封，可有效抵抗介质冲刷和磨损，完成初级密封，第二密封件与球体的表面柔性抵接，利用第二密封件的自身弹性填充球体表面的微观间隙，实现软性密封，完成次级密封，进一步提升密封效果，形成了硬密封抗冲击和软密封补间隙的双重密封保障；其次，第一弹性件能够沿第一方向去推动第二密封件，使得第二密封件始终紧贴球体，实现软性密封的微观间隙补偿，第二弹性件能够沿第一方向去推动阀座本体使得第一密封件始终紧贴球体，实现阀座本体的宏观位移补偿，确保硬性密封的持续接触，此密封阀座采用双重密封屏障和双重弹性补偿以显著降低泄漏风险，硬性密封阻挡大部分介质压力，软性密封进一步封堵残余泄漏通道，同时结合了硬性密封的耐腐蚀性软性密封的高密封性，能在各种复杂工况下保持良好的密封性能，提升整体阀门的使用寿命。
Smart Images
Figure CN224919834U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve equipment technology, and in particular to a sealing valve seat and a ball valve. Background Technology
[0002] The main function of a ball valve in a pipeline is to cut off, distribute, and change the flow direction of the medium. The opening and closing element of a ball valve is a ball that rotates 90 degrees around the valve stem axis to achieve opening and closing. A fixed ball valve is a type of ball valve where the ball is fixed and supported by two fixed shafts connected to the ball. This reduces friction on the journals during opening and closing, thus reducing operating torque. Fixed ball valves typically incorporate a sealing structure to prevent media leakage, thereby ensuring normal valve operation.
[0003] Typically, fixed ball valves employ either soft or hard seals. When using only a soft seal, a rubber component is placed between the valve seat and the ball as a sealing pair, providing good sealing performance. However, the corrosion resistance and high-temperature resistance of rubber components are generally poor, making them prone to damage or corrosion in high-temperature operating environments, resulting in a relatively short service life. When using only a hard seal, various hard alloys are welded or sprayed between the valve seat and the ball as a sealing surface, providing good corrosion resistance, but with somewhat inferior sealing performance.
[0004] Therefore, there is an urgent need for a ball valve that combines the advantages of both soft and hard sealing to address the aforementioned technical deficiencies. Utility Model Content
[0005] The purpose of this invention is to provide a sealing valve seat and ball valve that combines the advantages of both soft and hard sealing.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A sealing valve seat is disposed between a valve body and a ball, and is capable of abutting against the ball to achieve a seal, the sealing valve seat comprising:
[0008] The valve seat body extends along a first direction, and a first sealing element is provided on the side of the valve seat body facing the ball. The first sealing element rigidly abuts against the surface of the ball to achieve a primary hard seal between the sealing valve seat and the ball. A first receiving groove with an axis extending along the first direction is also provided on the side of the valve seat body facing the ball.
[0009] The second sealing element is located in the first receiving groove, and the second sealing element flexibly abuts against the surface of the ball to achieve a secondary soft seal between the sealing valve seat and the ball.
[0010] A first elastic element is located within the first receiving groove and between the bottom of the first receiving groove and the second sealing element, for pushing the second sealing element along the first direction so that the second sealing element is always in close contact with the sphere;
[0011] The second elastic element is located between the valve body and the valve seat body, and is used to push the valve seat body along the first direction so that the first seal is always in close contact with the ball.
[0012] Preferably, the sealing valve seat further includes a stop member disposed on the valve seat body, and the stop member extends along a second direction and abuts against the second sealing member to restrict the second sealing member from disengaging from the first receiving groove, wherein the second direction is set at an angle to the first direction.
[0013] Preferably, the abutment is provided with an inclined sidewall, which is located on the side of the abutment away from the second seal, and the inclined sidewall is adapted to the outer surface of the sphere.
[0014] Preferably, the sealing valve seat further includes a third sealing element, and the valve seat body is recessed on the side facing the valve body with a second receiving groove, and the groove depth direction of the second receiving groove is parallel to the second direction. The third sealing element is located in the second receiving groove and abuts against the valve body to achieve a seal between the valve seat body and the valve body, wherein the second direction is set at an angle to the first direction.
[0015] Preferably, the first sealing element is made of alloy, and the first sealing element and the valve seat body are integrally formed.
[0016] Preferably, the second seal is made of plastic.
[0017] Preferably, the first elastic element is made of rubber, and / or the second elastic element is a compression spring.
[0018] Preferably, the valve seat body is also provided with an oil injection hole and a lubrication channel, one end of the lubrication channel is connected to the oil injection hole, and the first seal is located in the lubrication channel.
[0019] A ball valve includes a valve body, a ball, and a sealing seat as described above, wherein the sealing seat is disposed between the valve body and the ball.
[0020] Preferably, the valve body is provided with a fixing groove whose axis extends along a first direction, one end of the second elastic member is fixed to the bottom of the fixing groove, and the other end is connected to the side of the valve seat body opposite to the ball.
[0021] The beneficial effects of this utility model are:
[0022] This utility model proposes a sealing valve seat, disposed between a valve body and a ball, capable of abutting against the ball to achieve a seal. The sealing valve seat specifically includes a valve seat body, a first sealing element, a second sealing element, a first elastic element, and a second elastic element. The valve seat body extends along a first direction, and the first sealing element is disposed on the side of the valve seat body facing the ball. The first sealing element rigidly abuts against the surface of the ball, achieving a primary hard seal between the valve seat and the ball. A first receiving groove extending along the first direction is also provided on the side of the valve seat body facing the ball. The second sealing element is located within the second receiving groove and flexibly abuts against the surface of the ball, achieving a secondary soft seal between the valve seat and the ball. The first elastic element is located within the first receiving groove and between the bottom of the groove and the second sealing element, used to push the second sealing element along the first direction, ensuring the second sealing element remains tightly against the ball. The second elastic element is located between the valve body and the valve seat body, used to push the valve seat body along the first direction, ensuring the first sealing element remains tightly against the ball. In this design, the first sealing element rigidly abuts against the surface of the sphere, ensuring a tight seal by utilizing its own rigidity, thus achieving a hard seal. This effectively resists media erosion and wear, completing the primary seal. The second sealing element flexibly abuts against the surface of the sphere, filling the microscopic gaps on the sphere's surface with its own elasticity, achieving a soft seal, thus completing the secondary seal and further improving the sealing effect. This creates a dual sealing guarantee of hard seal impact resistance and soft seal gap filling. Furthermore, the first elastic element can push the second sealing element along a first direction, enabling the second seal to... The first sealing element remains in close contact with the sphere, achieving microscopic gap compensation for the soft seal. The second elastic element can push the valve seat body along the first direction, ensuring that the first sealing element remains in close contact with the sphere, achieving macroscopic displacement compensation for the valve seat body, and ensuring continuous contact of the hard seal. This sealing valve seat adopts a double sealing barrier and double elastic compensation to significantly reduce the risk of leakage. The hard seal blocks most of the medium pressure, and the soft seal further blocks residual leakage channels. At the same time, it combines the corrosion resistance of the hard seal with the high sealing performance of the soft seal, which can maintain good sealing performance under various complex working conditions and improve the overall service life of the valve.
[0023] On the other hand, this utility model also proposes a ball valve, including a valve body, a ball and the aforementioned sealing valve seat, which has good sealing performance, thereby extending the service life of the ball valve and reducing the frequency of downtime maintenance. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the sealing valve seat proposed in the embodiments of this utility model;
[0025] Figure 2 This is a schematic diagram of the ball valve structure proposed in an embodiment of this utility model.
[0026] In the picture:
[0027] 11. Valve seat body; 111. First receiving groove; 112. Second receiving groove; 113. Through hole; 12. First seal; 13. Second seal; 14. First elastic element; 15. Second elastic element; 16. Abutment; 161. Inclined side wall; 17. Third seal; 18. Oil injection hole; 181. Lubrication channel; 2. Valve body; 21. Fixing groove; 3. Ball; 31. Through hole. Detailed Implementation
[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0032] Reference Figure 1 and Figure 2 This embodiment proposes a sealing valve seat, disposed between the valve body 2 and the ball 3, and capable of abutting against the ball 3 to achieve a seal. The sealing valve seat specifically includes a valve seat body 11, a first sealing element 12, a second sealing element 13, a first elastic element 14, and a second elastic element 15. The valve seat body 11 extends along a first direction, and the first sealing element 12 is disposed on the side of the valve seat body 11 facing the ball 3. The first sealing element 12 rigidly abuts against the surface of the ball 3, achieving a primary hard seal between the sealing valve seat and the ball 3. The side of the valve seat body 11 facing the ball 3 also has a first sealing element 15 extending along the first direction. The receiving groove 111 contains a second sealing element 13 located within it, which flexibly abuts against the surface of the ball 3, achieving a secondary soft seal between the valve seat and the ball 3. A first elastic element 14 is located within the first receiving groove 111, between the bottom of the groove and the second sealing element 13, and is used to push the second sealing element 13 along a first direction, ensuring it remains tightly against the ball 3. A second elastic element 15 is located between the valve body 2 and the valve seat body 11, and is used to push the valve seat body 11 along a first direction, ensuring the first sealing element 12 remains tightly against the ball 3. The primary hard seal is the first layer of seal, and the secondary soft seal is the second layer of seal.
[0033] The ball 3 is provided with a through hole 31 extending in the first direction, and the valve seat body 11 is provided with a through hole 113 extending in the first direction. The through hole 31 and the through hole 113 are corresponding and connected, and the medium flows through the through hole 31 and the through hole 113. The first seal 12 is located upstream of the second seal 13, that is, the first seal 12 is closer to the through hole 31 and the through hole 113 and closer to the medium. The second seal 13 is located outside the first seal 12. The first seal 12 is rigidly abutted against the ball 3, which can filter impurities in the medium and withstand high pressure erosion, effectively preventing solid particles in the medium from damaging the surface of the ball 3 and the first seal 12. At the same time, it can also protect the second seal 13 behind it and improve the service life of the second seal 13. The second seal 13 is flexibly abutted against the ball 3, further realizing the high-demand precision seal.
[0034] The first sealing element 12 rigidly abuts against the surface of the sphere 3, ensuring a tight contact between the surface of the sphere 3 and the first sealing element 12 through its own rigidity, achieving a hard seal that effectively resists media erosion and wear, thus completing the primary seal. The second sealing element 13 flexibly abuts against the surface of the sphere 3, filling the microscopic gaps on the surface of the sphere 3 through its own elasticity, achieving a soft seal, thus completing the secondary seal and further improving the sealing effect. This forms a dual sealing guarantee of hard seal impact resistance and soft seal gap filling. Furthermore, the first elastic element 14 can push the second sealing element 13 along the first direction, making the second sealing element... The seal 13 is always in close contact with the ball 3, achieving microscopic gap compensation for the soft seal. The second elastic element 15 can push the valve seat body 11 along the first direction so that the first seal 12 is always in close contact with the ball 3, achieving macroscopic displacement compensation for the valve seat body 11 and ensuring continuous contact of the hard seal. This sealing valve seat adopts a double sealing barrier and double elastic compensation to significantly reduce the risk of leakage. The hard seal blocks most of the medium pressure, and the soft seal further blocks the residual leakage channel. At the same time, it combines the corrosion resistance of the hard seal and the high sealing performance of the soft seal, which can maintain good sealing performance under various complex working conditions and improve the service life of the overall valve.
[0035] It is understood that the valve seat body 11 is an annular cylindrical structure with a stepped surface on its outer peripheral sidewall. The first direction is the axial direction of the valve seat body 11. A first sealing element 12 is provided on the end wall of the valve seat body 11 facing the ball 3. The first sealing element 12 is also an annular structure on the end wall of the valve seat body 11. A first receiving groove 111 is provided on the end wall of the valve seat body 11, which is an annular groove. A second sealing element 13 is located in the first receiving groove 111. The second sealing element 13 is an annular sealing ring structure.
[0036] The first sealing element 12 is made of alloy to ensure high hardness. It is integrally formed with the valve seat body 11. For example, it can be formed by welding or spraying hard alloy onto the end wall of the valve seat body 11 facing the ball 3. The surface of the first sealing element 12 facing the ball 3 is the sealing surface, which is tightly fitted to the corresponding surface of the ball 3, ensuring a rigid seal and the stability of the connection between the first sealing element 12 and the valve seat body 11. In this embodiment, high-hardness alloy material, such as carbide or nickel 60, can be uniformly sprayed onto the end wall of the valve seat body 11 facing the ball 3 using supersonic spray welding technology. The spray thickness is between 0.2mm and 0.4mm, meaning the thickness of the first sealing element 12 is between 0.2mm and 0.4mm, and the hardness value is not less than 58HRC. The second sealing element 13 is made of plastic, specifically a plastic sealing ring, and polyurethane can be selected as the material.
[0037] The first elastic element 14 is located between the bottom of the first receiving groove 111 and the second sealing element 13. Through its own elasticity, it continuously applies a stable pre-tightening force to the second sealing element 13 along the first direction to ensure the sealing effect of the second sealing element 13. In addition, when the ball 3 shakes under the action of the medium, the first elastic element 14 can also absorb the instantaneous impact force, further protecting the second sealing element 13 from wear.
[0038] The second elastic element 15 is located between the valve body 2 and the valve seat body 11. One end of the second elastic element 15 is connected to the valve body 2, and the other end is connected to the side wall of the valve seat body 11 away from the ball 3. It can continuously apply a pushing force to the valve seat body 11 in the first direction through its own elasticity to ensure that the first sealing element 12 can always be tightly attached to the ball 3, thereby ensuring the sealing effect of the first sealing element 12. In addition, when the ball 3 shakes under the action of the medium, the second elastic element 15 can also absorb the instantaneous impact force to avoid damage to the ball 3 due to the first sealing element 12 being too hard.
[0039] In this embodiment, the first elastic element 14 can be made of rubber, possessing excellent elastic recovery and compression resistance, while the second elastic element 15 is a compression spring, providing stable linear thrust. In other embodiments, both the first elastic element 14 and the second elastic element 15 may also be made of rubber, or both may be compression springs.
[0040] Secondly, in order to ensure the sealing stability of the hard seal, the shape of the side of the first sealing element 12 near the ball 3 is consistent with the arc surface of the corresponding ball 3, so as to ensure that when the first sealing element 12 abuts against the ball 3, the first sealing element 12 can completely fit the corresponding position on the ball 3, avoiding gaps that could lead to sealing failure.
[0041] To prevent the second seal 13 from detaching from the first receiving groove 111 and causing soft seal failure, the sealing valve seat also includes a stop member 16. The stop member 16 is disposed on the valve seat body 11 and extends along a second direction to abut against the second seal 13, thereby limiting the second seal 13 from detaching from the first receiving groove 111. The second direction is set at an angle to the first direction. Specifically, the stop member 16 is disposed on the valve seat body 11 and located at the opening of the first receiving groove 111. The extending direction of the stop member 16 is set at an angle to the axial direction of the receiving groove, thereby partially blocking the opening of the receiving groove. The stop member 16 can abut against the side wall of the second seal 13 away from the first elastic member 14, thereby axially limiting the second seal 13 and preventing it from detaching from the first receiving groove 111, ensuring the installation stability of the second seal 13. In this embodiment, the second direction is perpendicular to the first direction, and the second direction is the radial direction of the valve seat body 11.
[0042] Furthermore, the abutment 16 is provided with an inclined sidewall 161, which is located on the side of the abutment 16 away from the second seal 13, and the inclined sidewall 161 is adapted to the outer surface of the ball 3. The inclined sidewall 161 on the abutment 16 can fit against the outer surface of the ball 3, so as to avoid affecting the sealing effect of the second seal 13 due to the presence of the abutment 16.
[0043] To improve the sealing performance between the valve seat body 11 and the valve body 2, the sealing valve seat also includes a third sealing element 17. The valve seat body 11 has a second receiving groove 112 recessed on the side facing the valve body 2, and the depth direction of the second receiving groove 112 is parallel to the second direction. The third sealing element 17 is located within the second receiving groove 112 and abuts against the valve body 2, achieving a seal between the valve seat body 11 and the valve body 2. The third sealing element 17 can be made of graphite, which has excellent self-lubricating properties and flexibility, allowing it to tightly conform to the valve body 2 and the groove wall of the second receiving groove 112, effectively filling minute gaps and thus achieving a good sealing effect.
[0044] The valve seat body 11 is also provided with an oil injection hole 18 and a lubrication channel 181. One end of the lubrication channel 181 is connected to the oil injection hole 18. The first seal 12 is located in the lubrication channel 181. The oil injection hole 18 can inject lubricating oil. The lubricating oil reaches the first seal 12 through the lubrication channel 181 and can form an oil film around and on the surface of the first seal 12, which can reduce friction and wear, and also play a certain sealing role.
[0045] On the other hand, this embodiment also proposes a ball valve, including a valve body 2, a ball 3, and the aforementioned sealing seat, which has good sealing performance, thereby extending the service life of the ball valve and reducing the frequency of downtime maintenance. Specifically, the sealing seat is located between the valve body 2 and the ball 3, and the sealing seat can achieve good sealing with both the ball 3 and the valve body 2, preventing media leakage.
[0046] The second elastic element 15 is located at least partially inside the valve body 2. In this embodiment, the valve body 2 is provided with a fixing groove 21 whose axis extends along the first direction. One end of the second elastic element 15 of the sealing valve seat is fixed to the bottom of the fixing groove 21, and the other end is connected to the side of the valve seat body 11 of the sealing valve seat away from the ball 3. The axis of the fixing groove 21 extends along the first direction, which ensures that the force direction of the second elastic element 15 is parallel to the first direction, and also protects the second elastic element 15 to prevent it from being scratched.
[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A sealing valve seat, wherein the sealing valve seat is disposed between a valve body (2) and a ball (3) and is capable of abutting against the ball (3) to achieve a seal, characterized in that, The sealing valve seat includes: A valve seat body (11) extends along a first direction, and a first sealing element (12) is provided on the side of the valve seat body (11) facing the ball (3). The first sealing element (12) rigidly abuts against the surface of the ball (3) to achieve a primary hard seal between the sealing valve seat and the ball (3). A first receiving groove (111) with its axis extending along the first direction is also provided on the side of the valve seat body (11) facing the ball (3). The second seal (13) is located in the first receiving groove (111), and the second seal (13) flexibly abuts against the surface of the ball (3) to achieve a secondary soft seal between the sealing valve seat and the ball (3). The first elastic element (14) is located in the first receiving groove (111) and between the bottom of the first receiving groove (111) and the second sealing element (13), and is used to push the second sealing element (13) along the first direction so that the second sealing element (13) is always in close contact with the sphere (3). The second elastic element (15) is located between the valve body (2) and the valve seat body (11) and is used to push the valve seat body (11) along the first direction so that the first seal (12) is always in close contact with the ball (3).
2. The sealing valve seat according to claim 1, characterized in that, The sealing valve seat also includes a stop (16), which is disposed on the valve seat body (11) and extends along a second direction and abuts against the second seal (13) to restrict the second seal (13) from disengaging from the first receiving groove (111), wherein the second direction is set at an angle to the first direction.
3. The sealing valve seat according to claim 2, characterized in that, The abutment (16) is provided with an inclined sidewall (161), the inclined sidewall (161) is located on the side of the abutment (16) away from the second seal (13), and the inclined sidewall (161) is adapted to the outer surface of the sphere (3).
4. The sealing valve seat according to any one of claims 1-3, characterized in that, The sealing valve seat also includes a third sealing element (17). The valve seat body (11) is recessed on the side facing the valve body (2) with a second receiving groove (112). The groove depth direction of the second receiving groove (112) is parallel to the second direction. The third sealing element (17) is located in the second receiving groove (112) and abuts against the valve body (2) to achieve a seal between the valve seat body (11) and the valve body (2). The second direction is set at an angle to the first direction.
5. The sealing valve seat according to any one of claims 1-3, characterized in that, The first sealing element (12) is an alloy component, and the first sealing element (12) and the valve seat body (11) are integrally formed.
6. The sealing valve seat according to any one of claims 1-3, characterized in that, The second seal (13) is made of plastic.
7. The sealing valve seat according to any one of claims 1-3, characterized in that, The first elastic element (14) is made of rubber, and / or the second elastic element (15) is a compression spring.
8. The sealing valve seat according to any one of claims 1-3, characterized in that, The valve seat body (11) is also provided with an oil injection hole (18) and a lubrication channel (181). One end of the lubrication channel (181) is connected to the oil injection hole (18), and the first seal (12) is located in the lubrication channel (181).
9. A ball valve, characterized in that, It includes a valve body (2), a ball (3), and a sealing valve seat as described in any one of claims 1-8, wherein the sealing valve seat is disposed between the valve body (2) and the ball (3).
10. The ball valve according to claim 9, characterized in that, The valve body (2) is provided with a fixing groove (21) whose axis extends along the first direction. One end of the second elastic member (15) is fixed to the bottom of the fixing groove (21), and the other end is connected to the side of the valve seat body (11) away from the ball (3).