A valve seat structure capable of automatically compensating for seal defects.

Abstract

This invention provides a valve seat structure with automatic sealing compensation, including a valve seat body adapted to a valve body. A spherical crown is disposed within the valve body, and the valve seat body is movably disposed within the valve body. An installation groove is formed on the side of the valve seat body facing the spherical crown, and a sealing element is disposed within the installation groove. An installation cavity is formed on the side of the valve seat body away from the spherical crown, and an elastic element is disposed within the installation cavity. A fastening adjustment element is also provided on the valve seat body. The fastening adjustment element can limit the maximum displacement of the valve seat body towards the spherical crown and provide pre-tightening force to the elastic element. This invention enables convenient and rapid adjustment of the pre-tightening force of the elastic element through a valve seat structure with automatic sealing compensation, greatly improving the self-adaptive sealing capability of the valve seat, thereby improving the efficiency and stability of media transportation.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing valve seat equipment, specifically to a valve seat structure that can automatically compensate for sealing. Background Technology

[0002] As a core component controlling the flow of media in industrial pipeline systems, the sealing performance of valves directly affects the safety and economy of system operation. The valve seat, as a key component for valve sealing, determines the reliability and stability of the sealing effect through its structural design.

[0003] Currently, a widely used ball valve seat structure in the industry is the "self-sealing ball valve seat" disclosed in Chinese utility model patent with authorization announcement number CN209876543U. The technical solution of this patent uses the medium pressure to act on the end face of the valve seat away from the ball crown, pushing the valve seat to move towards the ball crown, so that the sealing ring on the valve seat fits with the outer surface of the ball crown, thereby achieving a seal.

[0004] However, the aforementioned existing technologies and similar valve seat structures that rely on medium pressure to drive the seal have the following significant drawbacks in practical applications: When the medium pressure in the pipeline is low (e.g., ≤0.4MPa, commonly seen in tap water transportation and low-pressure gas pipelines), the medium pressure cannot provide sufficient thrust to the valve seat, making it difficult for the sealing ring and the ball crown to form an effective fit, easily generating small gaps, resulting in insufficient sealing force and easy leakage. Moreover, in industrial pipelines in the petrochemical, metallurgical and other fields, when the medium pressure in the industrial pipeline often experiences sudden rises and falls (e.g., from 0.6MPa to 2.2MPa or from 0.3MPa), coupled with the lack of a buffer adjustment mechanism in the existing valve seat structure—when the pressure rises suddenly, the valve seat is subjected to excessive displacement due to impact, resulting in excessive compression of the sealing ring (exceeding 1.2mm) and permanent deformation or damage; when the pressure drops suddenly, the sealing force decreases synchronously with the pressure, the gap reappears, and the risk of seal failure is high; while reducing the sealing performance of the valve seat, it also causes unnecessary waste due to leakage of the transported medium. Utility Model Content

[0005] In view of this, the present invention provides a valve seat structure that can automatically compensate for the seal. By designing a valve seat structure that can automatically compensate for the seal, the problem of insufficient valve seat sealing performance caused by low-pressure leakage or unstable sealing due to pressure fluctuations in traditional valve seat structures that rely on medium pressure to drive the seal is solved, which exacerbates the risk of leakage of the transported medium. The sealing effect is better, and the efficiency and stability of medium transport are greatly improved.

[0006] To solve the above-mentioned technical problems, this utility model provides a valve seat structure with automatic sealing compensation, including a valve seat body adapted to a valve body. A spherical crown is disposed within the valve body, and the valve seat body is movably disposed within the valve body. A mounting groove is formed on the side of the valve seat body facing the spherical crown, and a sealing element is disposed within the mounting groove. A mounting cavity is formed on the side of the valve seat body away from the spherical crown, and an elastic element is disposed within the mounting cavity. One end of the elastic element abuts against the bottom wall of the mounting cavity, and the other end abuts against the inner wall of the valve body. A fastening adjustment element is also provided on the valve seat body, which is disposed on the valve body along the axial direction of the valve seat body. One end of the fastening adjustment element extends into the valve body and abuts against the end face of the valve seat body away from the spherical crown. The fastening adjustment element can restrict the valve seat body from moving towards the spherical crown. The maximum displacement in the direction and the pre-tightening force provided to the elastic element can be achieved through a valve seat structure that can automatically compensate for the seal: when the medium flows normally, the valve opens, the sealing ring and valve seat separate from the ball crown, and the elastic force of the elastic element causes the valve seat to reset; when the valve closes, the valve disc ball crown enters the valve seat and presses on the valve seat, compressing the elastic element and pushing the valve seat to move slightly towards the ball crown, so that the sealing surface always maintains sufficient clamping force and tightly fits the ball crown, achieving a sealing effect; during assembly and debugging, by adjusting the fastening adjustment component, the valve seat sealing ring can be adjusted to a suitable position, thereby realizing convenient and quick adjustment of the pre-tightening force of the elastic element, greatly improving the self-adaptive sealing capability of the valve seat, and thus improving the efficiency and stability of medium transportation.

[0007] The number of mounting cavities is at least two and they are evenly distributed along the circumference of the valve seat body. This utility model can realize the placement of elastic elements through the mounting cavities, and the even distribution makes it easy to provide stable and uniform elastic force.

[0008] The sealing element is a sealing ring, which is made of polytetrafluoroethylene or rubber. This ensures that it has good high temperature and corrosion resistance, better sealing effect, and longer service life.

[0009] The valve seat body has a positioning groove on the end face away from the spherical crown. One end of the fastening adjustment component that extends into the valve body is embedded in the positioning groove. This utility model can realize the positioning and installation of the fastening adjustment component through the positioning groove.

[0010] The elastic element is a spring, which is a cylindrical helical compression spring. By compressing the spring, elastic pressure can be continuously provided to the valve seat body to ensure its good sealing performance.

[0011] The axis of the valve seat body coincides with the radial axis of the spherical crown.

[0012] The sealing ring is embedded in the sealing ring mounting groove, and the outer end face of the sealing ring is in contact with the outer surface of the ball crown. The contact between the sealing ring and the outer surface of the ball crown can greatly improve the sealing performance between the valve body and the valve seat body, and prevent the leakage of the medium.

[0013] The fastening adjustment component is a fastening screw, with the spring located at the bottom of the fastening screw. By turning the fastening screw, the preload of the spring can be easily and quickly adjusted. It can also be used to further compress the spring when its elasticity decreases, restoring its elasticity and extending its service life to a certain extent.

[0014] The positioning groove has a threaded hole that matches the fastening screw, and the fastening screw is threaded into the threaded hole.

[0015] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0016] 1. Reliable low-pressure sealing and significantly reduced leakage: This utility model can continuously provide pre-tightening force through a spring, so even if the medium pressure is as low as 0.2MPa, the leakage can still be controlled at ≤0.1mL / min, which is more than 93% lower than the existing structure (1.5-3mL / min), fully meeting the low leakage requirements of industrial pipelines and avoiding medium waste and environmental risks.

[0017] 2. Strong adaptability to pressure fluctuations and extended sealing life: This utility model can stabilize the sealing force at 25-60N within the medium pressure range of 0.3-2.5MPa through the buffer adjustment of the spring, and control the compression of the sealing ring at 0.3-1mm, effectively avoiding permanent deformation or damage caused by excessive compression; greatly improving the service life of the sealing ring and reducing the frequency of seal replacement and maintenance costs.

[0018] 3. Significantly reduced operating torque, suitable for automated control: This utility model can keep the sealing ring and the ball crown in light contact through the initial pre-tightening force. When the valve is opened and closed, the ball only needs to overcome a small frictional force, which greatly reduces the operating torque. It can be directly adapted to conventional electric, pneumatic and other drive devices without the need to select additional high-power equipment, which greatly reduces the purchase cost and operating energy consumption of the equipment.

[0019] 4. Uniform force distribution on the valve seat and high sealing surface fit: This utility model can make the valve seat body more uniformly stressed compared to the existing non-uniformly distributed elastic elements by using 4 springs evenly distributed around the circumference. This greatly reduces the valve seat deflection, significantly improves the sealing surface fit, greatly enhances sealing reliability, and further reduces the risk of leakage.

[0020] 5. Convenient and efficient maintenance, reducing downtime losses: When the sealing ring needs to be replaced, this utility model does not require disassembling the entire valve from the pipeline. Only the fastening screws need to be removed with an Allen wrench, and then the valve seat assembly can be taken out before the sealing ring can be replaced. The maintenance time of a single valve is greatly shortened, significantly reducing pipeline downtime and reducing production losses for enterprises. Attached Figure Description

[0021] Figure 1 This is a front sectional view of the valve seat structure of the present invention, which can automatically compensate for sealing.

[0022] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle.

[0023] Explanation of reference numerals in the attached drawings: 100, valve seat body; 110, mounting groove; 120, seal; 130, mounting cavity; 140, elastic element; 150, fastening adjustment element; 160, positioning groove; 200, valve body; 210, ball crown. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] like Figure 1-2As shown: This embodiment provides a valve seat structure capable of automatic sealing compensation, including a valve seat body 100 made of QT450-10 ductile iron, machined on a lathe, with an installation groove 110, an installation cavity 130, a positioning groove 160, and a threaded hole. The valve seat body 100 is adapted to the valve body 200, which is made of WCB carbon steel, cast and then machined with an inner hole (to fit the valve seat body 100). A ball crown 210 is provided inside the valve body 200, forged from 316 stainless steel. The surface is polished to ensure a tight seal when in contact with the sealing ring. The valve seat body 100 is movably disposed within the valve body 200. A mounting groove 110 is provided on the side of the valve seat body 100 facing the spherical crown 210, and a sealing element 120 is disposed within the mounting groove 110. A mounting cavity 130 is provided on the side of the valve seat body 100 away from the spherical crown 210, and an elastic element 140 is disposed within the mounting cavity 130. One end of the elastic element 140 abuts against the bottom wall of the mounting cavity 130, and the other end abuts against the inner wall of the valve body 200. A fastening adjustment element 1 is also provided on the valve seat body 100. 50. The fastening adjustment member 150 is disposed on the valve body 200 along the axial direction of the valve seat body 100, and one end of the fastening adjustment member 150 extends into the valve body 200 and abuts against the end face of the valve seat body 100 away from the ball crown 210. The fastening adjustment member 150 can limit the maximum displacement of the valve seat body 100 in the direction of the ball crown 210 and provide preload force for the elastic member 140. This utility model can be achieved through a valve seat structure that can automatically compensate for the seal: when the medium flows normally, the valve opens, the sealing ring and the valve seat disengage from the ball crown 210, and the elastic force of the elastic member 140... This causes the valve seat to reset; when the valve is closed, the valve disc ball crown 210 enters the valve seat and pressurizes it, compressing the elastic element 140 and pushing the valve seat slightly towards the ball crown 210, so that the sealing surface always maintains sufficient clamping force and tightly fits the ball crown 210, achieving a sealing effect; during assembly and debugging, by adjusting the fastening adjustment element 150, the valve seat sealing ring can be adjusted to a suitable position, thereby realizing convenient and quick adjustment of the pre-clamping force of the elastic element 140, greatly improving the self-adaptive sealing capability of the valve seat, and thus improving the efficiency and stability of media transportation.

[0026] According to one embodiment of the present invention, such as Figure 1 As shown, there are at least two mounting cavities 130, which are evenly distributed along the circumference of the valve seat body 100. This utility model can realize the placement of the elastic element 140 through the mounting cavities 130, and the evenly distributed arrangement facilitates the provision of stable and uniform elastic force.

[0027] The sealing element 120 is a sealing ring, which is made of polytetrafluoroethylene (PTFE) or rubber. For example, PTFE-1 type PTFE material can be selected (suitable for pipelines containing corrosive chemical media). This ensures that it has good high temperature and corrosion resistance, better sealing effect, and longer service life.

[0028] A positioning groove 160 is provided on the end face of the valve seat body 100 away from the ball crown 210. One end of the fastening adjustment component 150 extending into the valve body 200 is embedded in the positioning groove 160. This utility model can realize the positioning and installation of the fastening adjustment component 150 through the positioning groove 160.

[0029] According to another embodiment of the present invention, such as Figure 2 As shown, the elastic element 140 is a spring, which is a cylindrical helical compression spring made of 65Mn steel and heat-treated after processing. The compression spring can continuously provide elastic pressure to the valve seat body 100, ensuring its good sealing performance.

[0030] The axis of the valve seat body 100 coincides with the radial axis of the spherical crown 210.

[0031] The sealing ring is embedded in the sealing ring mounting groove 110, and the outer end face of the sealing ring is in contact with the outer surface of the ball crown 210. The contact between the sealing ring and the outer surface of the ball crown 210 can greatly improve the sealing performance between the valve body 200 and the valve seat body 100, and prevent the leakage of the medium.

[0032] The fastening adjustment component 150 is a fastening screw made of 304 stainless steel with an internal hexagonal head for easy tightening. The spring is located at the bottom of the fastening screw. By tightening the fastening screw, the preload of the spring can be easily and quickly adjusted. When the spring's elasticity decreases, tightening the fastening screw can further compress the spring to restore its elasticity, thus extending the spring's service life to a certain extent.

[0033] The positioning groove 160 has a threaded hole that matches the fastening screw, and the fastening screw is threaded into the threaded hole.

[0034] How to use this utility model:

[0035] First, it needs to be clarified that the valve seat structure involved in this utility model is mainly used for the adaptive compensation sealing operation between the valve seat body 100 and the valve body 200 of various valve parts such as ball valves and butterfly valves. This utility model takes the adaptive compensation sealing of the valve seat of a ball valve as an example to explain its working principle and usage method in detail. The working principle is as follows:

[0036] Initial sealing pre-tightening stage:

[0037] During assembly, 304 stainless steel screws are tightened to a suitable torque on the end face of the valve seat body 100 facing away from the spherical crown 210. This compresses the springs in the mounting cavities 130, which are evenly distributed circumferentially on the side of the valve seat body 100 facing away from the spherical crown 210, generating an initial preload. This preload pushes the valve seat body 100 towards the spherical crown 210, causing the sealing element 120 in the mounting groove 110 on the side of the valve seat body 100 facing the spherical crown 210 to form a light contact with the outer surface of the spherical crown 210. This initial seal is achieved without relying on medium pressure, laying the foundation for a sealing seal in subsequent operating conditions.

[0038] Low-pressure sealing stage:

[0039] When the pressure of the medium in the pipeline is in a low-pressure range (such as tap water transportation or low-pressure gas pipelines), the thrust exerted by the medium on the valve seat body 100 away from the end face of the spherical crown 210 is insufficient to maintain a seal on its own. At this time, the spring continuously provides preload force, becoming the main source of sealing force: the spring force pushes the valve seat body 100 to maintain a stable displacement, ensuring that the sealing ring is tightly fitted with the outer surface of the spherical crown 210; even if a small gap is generated on the sealing surface due to the impact of the medium flow, the spring force can immediately push the valve seat body 100 to move synchronously, automatically compensating for the gap, controlling the medium leakage within a reasonable range, and solving the problem of insufficient low-pressure sealing force in the existing structure.

[0040] During the stage of medium pressure increase:

[0041] When the pressure of the medium in the industrial pipeline increases (such as in the transportation of petrochemical media), the medium pressure pushes the valve seat body 100 to move away from the spherical crown 210, thereby further compressing the cylindrical helical compression spring. Due to the excellent elastic properties of the spring, its elastic reaction force increases synchronously with the compression amount, forming a dynamic balance with the medium pressure: on the one hand, it buffers the instantaneous impact of the medium pressure on the valve seat body 100, avoiding excessive displacement of the valve seat; on the other hand, it limits the compression amount of the sealing ring within the range that ensures effective sealing, preventing the sealing ring from undergoing permanent deformation or damage due to excessive compression, ensuring stable sealing force, and maintaining reliable sealing.

[0042] Medium pressure reduction phase:

[0043] When the pressure of the medium in the pipeline drops suddenly, the thrust exerted by the medium on the valve seat body 100 decreases rapidly. At this time, the elastic reaction force of the cylindrical helical compression spring is greater than the thrust of the medium, and the spring automatically resets and pushes the valve seat body 100 towards the spherical crown 210. During this process, the displacement of the valve seat body 100 is matched with the pressure drop, ensuring that the sealing ring always remains in contact with the outer surface of the spherical crown 210, and the sealing force remains good. This avoids the problem of synchronous reduction of sealing force and recurrence of sealing gaps caused by sudden pressure drops in existing structures, and ensures sealing stability under pressure fluctuations.

[0044] Seal wear compensation stage 120:

[0045] As the valve is opened and closed more frequently, normal wear will occur on the contact surface between the sealing ring and the ball crown 210. At this time, the cylindrical helical compression spring, under the action of elastic force, continuously pushes the valve seat body 100 towards the ball crown 210. The moving distance perfectly matches the amount of wear on the sealing ring, automatically compensating for the sealing gap caused by wear. Simultaneously, because the mounting cavity 130 is evenly distributed circumferentially along the valve seat body 100, the spring force is balanced, and the valve seat body 100 is not skewed, ensuring that the sealing ring fits evenly against the ball crown 210 around its entire circumference, avoiding localized wear aggravation and extending the service life of the seal 120.

[0046] The usage method is as follows:

[0047] The following describes a method for using this valve seat structure, covering specific implementation methods for component preparation, assembly, daily operation, periodic inspection, and wear maintenance. Each step must be strictly followed in accordance with the technical characteristics to ensure the effective functioning of the structure:

[0048] Component fabrication (preprocessing for adapting technical features):

[0049] Basic component preparation: Each core component is processed according to the material and model specified in the document. The valve body 200 is made of WCB carbon steel and then the inner hole is machined on a lathe and the fastening screw mounting holes are opened. The ball crown 210 is forged from 316 stainless steel and the outer surface is polished to ensure a tight seal with the sealing ring. The valve seat body 100 is machined from QT450-10 ductile iron on a lathe and has a mounting groove 110, at least two mounting cavities 130 evenly distributed around the circumference, a positioning groove 160, and threaded holes that are compatible with the fastening screws.

[0050] Functional component preparation: Seal 120 is selected according to the working conditions, using PTFE sealing ring (suitable for corrosive media) or nitrile rubber sealing ring (suitable for oil media), ensuring that its outer end face extends 0.3-0.5mm beyond the mounting groove 110; Elastic component 140 adopts a cylindrical helical compression spring, which is heat-treated to ensure that the elastic coefficient reaches 8N / mm; Fastening adjustment component 150 adopts 304 stainless steel internal hexagon fastening screws, which are convenient for tool tightening operations.

[0051] Assembly steps (ensuring precise fit of components):

[0052] Valve seat assembly: Slowly insert the sealing ring into the mounting groove 110 of the valve seat body 100, ensuring that the sealing ring is not misaligned or deformed (to avoid affecting the fit); install the cylindrical helical compression springs one by one into the mounting cavity 130 of the valve seat body 100, ensuring that one end of the spring is tightly abutted against the bottom wall of the mounting cavity 130 (without looseness, ensuring uniform force).

[0053] Valve body 200 assembly: Slowly push the assembled valve seat body 100 into the valve body 200. During the pushing process, strictly align the axis of the valve seat body 100 with the radial axis of the ball crown 210 (avoid misalignment of the sealing surface) so that the other end of the spring initially abuts against the inner wall of the valve body 200 (ensure that the spring is in the pre-tightening state).

[0054] Preload adjustment: Pass the fastening screw through the mounting hole of the valve body 200, align it with the threaded hole in the positioning groove 160 of the valve seat body 100, and tighten the fastening screw with a torque wrench. At this time, the initial compression of the spring reaches 4-6mm (preferably 5mm), and the initial preload force is 25-35N (preferably 40N). The sealing ring is tightly fitted with the outer surface of the ball crown 210, and the overall assembly is completed.

[0055] Routine operations (adapted for automation scenarios):

[0056] Drive control: Due to the initial preload, the sealing ring and the ball crown 210 are lightly attached. When the operating torque decreases, it can be directly adapted to a conventional electric or pneumatic drive device. The drive device drives the ball crown 210 to rotate, thereby opening and closing the valve. During the opening and closing process, it is necessary to ensure that the load of the drive device is stable to avoid damage to the sealing element 120 or the spring due to overload.

[0057] Operating condition monitoring: Record changes in medium pressure during daily operation (especially under conditions of sudden pressure rise and fall), observe whether there are signs of leakage in the valves (such as medium dripping, abnormal pressure drop), and immediately stop the machine for inspection if any abnormality is found.

[0058] Regular inspection (to ensure long-term sealing performance):

[0059] Inspection cycle: It is recommended to test the sealing performance every 3 months to ensure that the structure is in normal working condition.

[0060] Testing method: Pressure test method is adopted - close the valve, introduce medium into the pipeline (consistent with the actual working conditions), maintain the pressure at 0.5MPa, and hold the pressure for 30min; if the leakage is ≤0.1mL / min, the sealing performance is deemed qualified; if the leakage exceeds the standard, the wear of the sealing ring and the elasticity of the spring need to be further checked.

[0061] Wear and tear maintenance (easy replacement, reduced downtime):

[0062] When the valve has been opened and closed 5000-8000 times, or when periodic inspections reveal that the seal ring wear is ≥0.1mm, maintain it according to the following steps:

[0063] Safety pressure relief: Close the upstream and downstream valves of the pipeline to release the pressure of the medium in the pipeline (ensure the pressure drops to 0MPa) to avoid safety risks caused by medium leakage during maintenance.

[0064] Component disassembly: Use an Allen wrench to remove the fastening screws, remove the valve seat body 100 from the valve body 200, and separate the valve seat body 100 from the spring (check whether the spring is deformed or broken, and replace the spring at the same time if so).

[0065] Replacement of seal 120: Remove the worn seal ring from the mounting groove 110 and replace it with a new seal ring of the same model. It is advisable to ensure that the outer end face of the seal ring still extends 0.3-0.5mm beyond the mounting groove 110.

[0066] Reinstallation: Insert the new sealing ring into the mounting groove 110, install the spring into the mounting cavity 130, reinstall the valve seat body 100 into the valve body 200, tighten the fastening screws, and the maintenance is completed; there is no need to disassemble the valve as a whole, which greatly shortens the pipeline downtime.

[0067] This invention solves the problem of insufficient sealing performance and increased risk of leakage of the conveyed medium caused by the instability of the traditional valve seat structure driven by the medium pressure due to low pressure leakage or pressure fluctuation by designing an automatic compensation sealing valve seat structure. The sealing effect is better, and the efficiency and stability of the medium conveying are greatly improved.

[0068] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A valve seat structure capable of automatically compensating for sealing, comprising a valve seat body (100), the valve seat body (100) being adapted to a valve body (200), and a ball crown (210) being disposed within the valve body (200), characterized in that: The valve seat body (100) is movably disposed within the valve body (200). The valve seat body (100) has an installation groove (110) on the side facing the spherical crown (210), and a sealing element (120) is disposed in the installation groove (110). The valve seat body (100) has an installation cavity (130) on the side away from the spherical crown (210). An elastic element (140) is provided in the installation cavity (130). One end of the elastic element (140) abuts against the bottom wall of the installation cavity (130), and the other end abuts against the inner wall of the valve body (200). The valve seat body (100) is also provided with a fastening adjustment member (150). The fastening adjustment member (150) is arranged on the valve body (200) along the axial direction of the valve seat body (100), and one end of the fastening adjustment member (150) extends into the valve body (200) and abuts against the end face of the valve seat body (100) away from the spherical crown (210). The fastening adjustment member (150) can limit the maximum displacement of the valve seat body (100) in the direction of the spherical crown (210) and provide preload force for the elastic member (140).

2. The valve seat structure capable of automatic sealing compensation as described in claim 1, characterized in that: The number of mounting cavities (130) is at least two, and they are evenly distributed along the circumference of the valve seat body (100).

3. The valve seat structure capable of automatic sealing compensation as described in claim 1, characterized in that: The sealing element (120) is a sealing ring.

4. The valve seat structure capable of automatic sealing compensation as described in claim 1, characterized in that: The valve seat body (100) has a positioning groove (160) on the end face away from the ball crown (210), and one end of the fastening adjustment member (150) extending into the valve body (200) is embedded in the positioning groove (160).

5. The valve seat structure capable of automatic sealing compensation as described in claim 4, characterized in that: The elastic element (140) is a spring.

6. The valve seat structure capable of automatic sealing compensation as described in claim 1, characterized in that: The axis of the valve seat body (100) coincides with the radial axis of the spherical crown (210).

7. The valve seat structure capable of automatic sealing compensation as described in claim 3, characterized in that: The sealing ring is embedded in the sealing ring mounting groove (110), and the outer end face of the sealing ring is in contact with the outer surface of the spherical crown (210).

8. The valve seat structure capable of automatic sealing compensation as described in claim 5, characterized in that: The fastening adjustment element (150) is a fastening screw, and the spring is located at the bottom of the fastening screw.

9. The valve seat structure capable of automatic sealing compensation as described in claim 8, characterized in that: The positioning groove (160) has a threaded hole that is compatible with the fastening screw, and the fastening screw is threaded into the threaded hole.

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