High-pressure sealing ball valve for hydrogen

Abstract

The application discloses a high-pressure sealing ball valve for hydrogen, and relates to the technical field of ball valves, which comprises a first valve body and a second valve body, the first valve body is detachably fixedly connected with the second valve body, and a sealing ring is arranged at the connecting position of the two valve bodies; a valve seat is fixedly connected with the second valve body, a valve rod is rotatably arranged in the valve seat, and an opening and closing valve mechanism is jointly arranged between the first valve body and the second valve body. The ball valve has the advantages that pressure self-adaptive regulation is realized through opening and closing and sealing actions, dynamic adaptation to working condition fluctuation is realized, component excessive wear is avoided while ensuring sealing reliability, the instantaneous leakage risk of a traditional valve in the opening and closing stage is reduced, and the impact damage of components and the operation resistance are significantly reduced on the basis of a multiple buffer structure and friction optimization, so that the equipment operation convenience is improved, the service life is effectively prolonged, and the severe working condition requirements of high-pressure hydrogen gas conveying are met.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and more particularly to a high-pressure sealing ball valve for hydrogen. Background Technology

[0002] With the booming development of the hydrogen energy industry, the safe transportation of high-pressure hydrogen has become a core technological bottleneck restricting the industry's large-scale advancement. Hydrogen itself has the characteristics of small molecular size and extremely high permeability, and it is extremely prone to hydrogen embrittlement of materials under high-pressure conditions. This places stringent performance requirements on the "ball valve," a key component in the transportation system.

[0003] However, the application of traditional ball valves in high-pressure hydrogen scenarios has many unavoidable drawbacks: First, the sealing performance relies excessively on the fixed clamping structure and lacks dynamic adjustment capability, making it unable to adapt to pressure fluctuations during hydrogen transportation. When the pressure rises sharply, gaps easily appear on the sealing surface due to insufficient clamping force, leading to hydrogen leakage; when the pressure drops sharply, the fixed clamping force causes excessive compression of the sealing surface, accelerating the wear process. Second, the direct hard contact between the sealing surface and the valve ball during valve opening and closing not only easily causes impact damage to the valve sealing surface and valve ball, but also increases the force required to open the valve due to excessive contact resistance, resulting in poor operation convenience. Third, the material selection of the sealing components is not fully adapted to hydrogen working conditions, with insufficient resistance to hydrogen embrittlement and impermeability. After long-term use in a high-pressure hydrogen environment, problems such as cracking and aging are prone to occur, seriously affecting the reliability of the seal.

[0004] To address this issue, we propose a high-pressure sealed ball valve for hydrogen. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art, and to propose a high-pressure sealing ball valve for hydrogen.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-pressure sealed ball valve for hydrogen includes a first valve body and a second valve body, which are detachably and fixedly connected. A sealing ring is provided at the connection between the first valve body and the second valve body. A valve seat is fixedly connected to the second valve body, and a valve stem is rotatably disposed in the valve seat. An opening and closing valve mechanism is installed between the first valve body and the second valve body. The opening and closing valve mechanism is used to open and close the delivery of hydrogen.

[0008] A sealing seat is fixedly installed on the first valve body. Connecting rods are fixedly installed on both sides of the valve seat. One of the connecting rods is fixedly connected to the second valve body, and the other connecting rod is movably connected to the first valve body through the sealing seat. The sealing seat is fixedly installed on the first valve body. An adaptive sealing mechanism is installed between the first valve body, the second valve body and the corresponding connecting rod. The adaptive sealing mechanism operates synchronously with the opening and closing action of the valve rod and performs adaptive sealing according to the pressure fluctuation of the high-pressure hydrogen medium on the sealing surface.

[0009] In the aforementioned high-pressure sealed ball valve for hydrogen, the opening and closing valve mechanism includes a valve ball fixedly disposed at the lower end of the valve stem, a through hole is formed between the first valve body and the second valve body, and the valve ball is rotatably disposed within the through hole.

[0010] In the aforementioned high-pressure sealed ball valve for hydrogen, a sealing plate is provided at the lower end of the connecting rod and inside the sealing seat, and the connecting rod is inserted into the sealing seat for sealing.

[0011] In the aforementioned high-pressure sealed ball valve for hydrogen, a rotating cavity is provided inside the valve seat, and a cam is fixedly provided on the valve stem, and the cam is rotatably disposed in the rotating cavity, and the cam is elliptical in shape.

[0012] In the aforementioned high-pressure sealing ball valve for hydrogen, the adaptive sealing mechanism includes a push groove formed in the connecting rod, and the push groove is connected to the rotating cavity. A pressing component is provided in the push groove.

[0013] In the aforementioned high-pressure sealed ball valve for hydrogen, the extrusion component includes two sliding grooves formed within a connecting rod. Both sliding grooves are connected to a push groove. A piston 2 is slidably and sealed within the upper port of the push groove. A slider is fixedly mounted on one side of the piston 2. A retaining ring is fixedly mounted at one end of the piston 2 located in the rotating cavity. Multiple steel balls are rotatably mounted on the side of the retaining ring near the cam. A spring 2 is fixedly mounted between the other end of the piston 2 and the push groove.

[0014] In the aforementioned high-pressure sealing ball valve for hydrogen, a piston is slidably disposed at the lower port of the push groove, a pressure rod is fixedly disposed at the lower end of the piston, and a slider is also fixedly disposed on one side of the piston, and both sliders are slidably disposed in the corresponding grooves.

[0015] In the aforementioned high-pressure sealing ball valve for hydrogen, both the first valve body and the second valve body are provided with extrusion grooves, and both extrusion grooves are connected to the lower ports of the corresponding push grooves. A pressure block is slidably arranged in both extrusion grooves, and a spring is fixedly arranged on the lower surface of the pressure block. The lower end of the spring is fixedly arranged between the extrusion groove and the extrusion groove. The push groove between piston one and piston two and the extrusion groove are filled with inert gas.

[0016] In the aforementioned high-pressure sealed ball valve for hydrogen, sealing gaskets are fixedly installed in both the first valve body and the second valve body, and Y-shaped grooves are opened on the side of the two sealing gaskets that are close to each other.

[0017] In the aforementioned high-pressure sealing ball valve for hydrogen, an elastic diaphragm is fixedly provided on the side of each of the two sealing gaskets that are far apart from each other, and the elastic diaphragm is provided on the back side of the corresponding position of the Y-shaped groove on the sealing gasket.

[0018] Compared with existing technologies, the advantages of this invention are as follows: it achieves adaptive pressure regulation through opening, closing and sealing actions, dynamically adapts to fluctuations in operating conditions, ensures sealing reliability while avoiding excessive wear of components, reduces the risk of instantaneous leakage during the opening and closing of traditional valves, and significantly reduces impact damage to components and operating resistance by relying on multiple buffer structures and friction optimization. This not only improves the convenience of equipment operation and maintenance but also effectively extends service life and meets the stringent operating conditions of high-pressure hydrogen transportation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-pressure sealing ball valve for hydrogen proposed in this invention;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 for Figure 2 Cross-sectional view of the structure along the AA direction;

[0022] Figure 4 for Figure 3 Enlarged structural diagram of part a;

[0023] Figure 5 for Figure 3 A schematic diagram of the three-dimensional structure;

[0024] Figure 6 for Figure 5 A schematic diagram of a structure rotated at a certain angle;

[0025] Figure 7 for Figure 6 A magnified schematic diagram of part b in the middle.

[0026] In the diagram: 1. First valve body; 2. Second valve body; 3. Valve stem; 4. Valve seat; 5. Connecting rod; 6. Sealing seat; 7. Cam; 8. Valve ball; 9. Sealing gasket; 10. Inert gas; 11. Push groove; 12. Pressure rod; 13. Piston one; 14. Pressure block; 15. Spring one; 16. Extrusion groove; 17. Elastic diaphragm; 18. Piston two; 19. Retaining ring; 20. Slide groove; 21. Spring two; 22. Rotating cavity; 23. Steel ball; 24. Y-shaped groove; 25. Slider. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figures 1-3 A high-pressure sealing ball valve for hydrogen includes a first valve body 1 and a second valve body 2, which are detachably and fixedly connected. This design facilitates the later inspection and replacement of internal components. Compared with a one-piece molded valve body, it greatly reduces the maintenance difficulty and operation and maintenance costs. A sealing ring is provided at the connection between the two. The sealing ring is made of fluororubber and has a trapezoidal cross-section. The trapezoidal structure can generate lateral deformation under the action of bolt tightening force, and tightly fits the connection end face of the first valve body 1 and the second valve body 2 to form the first static sealing barrier, effectively blocking the path of hydrogen leakage from the valve body gap.

[0029] A valve seat 4 is fixedly connected to the second valve body 2. A valve stem 3 is rotatably mounted inside the valve seat 4. A rotating cavity 22 is opened inside the valve seat 4. A cam 7 is fixedly mounted on the valve stem 3 and is rotatably mounted inside the rotating cavity 22. The cam 7 is elliptical in shape and is made of hard alloy material. This material has high hardness and strong wear resistance, and can withstand the friction with subsequent components for a long time, avoiding the decrease in power transmission accuracy caused by wear of the contour surface. At the same time, it has good resistance to hydrogen embrittlement and is suitable for high-pressure hydrogen environments.

[0030] A valve mechanism is installed between the first valve body 1 and the second valve body 2. This mechanism is used to open and close the supply of hydrogen. The valve mechanism includes a valve ball 8 fixedly mounted at the lower end of the valve stem 3. A through hole is formed between the first valve body 1 and the second valve body 2, and the valve ball 8 is rotatably mounted within the through hole. The valve ball 8 is made of Hastelloy C-276, which has extremely low hydrogen permeability, excellent resistance to hydrogen embrittlement and corrosion, and its surface is precision ground to a roughness Ra≤0.4μm. This reduces friction and wear with sealing components and improves the sealing surface's fit accuracy. The valve stem 3 is made of 17-4PH precipitation-hardening stainless steel, which, after aging treatment, can reach a hardness of HRC35-40. It combines high strength with resistance to hydrogen embrittlement. The surface is nitrided to enhance wear resistance and sealing performance, preventing leakage at the point where the valve stem 3 passes through the valve seat 4.

[0031] A sealing seat 6 is fixedly installed on the first valve body 1. The sealing seat 6 is made of polyetheretherketone reinforced material with added carbon fiber to improve rigidity and prevent deformation under high pressure. It also has good self-lubricating properties, reducing sliding friction with the connecting rod 5 and extending the service life of the component. Connecting rods 5 are fixedly installed on both sides of the valve seat 4. The lower end of the corresponding connecting rod 5 and the sealing seat 6 are provided with sealing plates. The corresponding connecting rod 5 is sealed and inserted into the sealing seat 6. One connecting rod 5 is fixedly connected to the second valve body 2, and the other connecting rod 5 is movably connected to the first valve body 1 through the sealing seat 6. The sealing seat 6 is fixedly installed on the first valve body 1. An adaptive sealing mechanism is installed between the first valve body 1, the second valve body 2 and the corresponding connecting rod 5. The adaptive sealing mechanism operates synchronously with the opening and closing action of the valve rod 3 and performs adaptive sealing according to the pressure fluctuation of the high-pressure hydrogen medium on the sealing surface.

[0032] Reference Figures 3-7 The adaptive sealing mechanism includes a push groove 11 opened in the connecting rod 5, and the push groove 11 is connected to the rotating cavity 22. A pressing component is provided in the push groove 11. The pressing component includes two sliding grooves 20 opened in the connecting rod 5. Both sliding grooves 20 are connected to the push groove 11. A piston 18 is slidably sealed in the upper port of the push groove 11. A slider 25 is fixedly provided on one side of the piston 18. A retaining ring 19 is fixedly provided at one end of the piston 18 located in the rotating cavity 22. Multiple steel balls 23 are rotatably arranged on the side of the retaining ring 19 near the cam 7. A spring 21 is fixedly provided between the other end of the piston 18 and the push groove 11.

[0033] Piston 18 is made of titanium alloy, which has low density and high strength. This material can ensure the rigidity of thrust transmission while reducing the impact of its own inertia on the response speed, ensuring that the sealing action quickly follows pressure changes. The retaining ring 19 is made of alloy steel, with a surface hardened to increase hardness and prevent deformation under long-term stress. The steel ball 23 is made of bearing steel, with a smooth surface and high wear resistance. Its function is to convert the sliding friction between cam 7 and retaining ring 19 into rolling friction, significantly reducing friction loss and improving the smoothness of cam 7 rotation and thrust transmission efficiency. Spring 21 is made of high-temperature alloy spring wire, which has stable elastic properties within a temperature range of 40℃ to 120℃, is resistant to hydrogen embrittlement and corrosion, and does not experience elastic decay over long-term use, providing a stable restoring force for piston 18.

[0034] A piston 13 is slidably mounted on the lower end of the push groove 11. Piston 13 is the core component for achieving adaptive sealing adjustment. It is made of titanium alloy, which has the following advantages: First, it has extremely low hydrogen permeability and excellent resistance to hydrogen embrittlement. It can withstand long-term immersion in high-pressure hydrogen without cracking, ensuring the long-term reliability of the component. Second, it has a moderate elastic modulus and no permanent deformation after being compressed, allowing for repeated pressure transmission and reset, ensuring the stability of adaptive sealing. Third, it has a low surface friction coefficient, resulting in low resistance to sliding contact with the push groove 11, improving the flexibility and response speed of sealing adjustment. Its material properties directly determine the pressure transmission efficiency and the accuracy of adaptive sealing.

[0035] A pressure rod 12 is fixedly installed at the lower end of piston 13, and a slider 25 is also fixedly installed on one side of piston 13. Both sliders 25 are slidably installed in the corresponding grooves 20. The push groove 11 between piston 13 and piston 2 18 and the extrusion groove 16 are filled with inert gas 10. The inert gas 10 is nitrogen or argon, and the initial filling pressure is 0.3-0.8MPa. Its function is to form a pressure buffer medium to avoid direct rigid contact between piston 13 and piston 2 18. At the same time, the compressibility of the gas enhances the stability of adaptive adjustment and reduces the impact of pressure fluctuations on the sealing gasket 9. Extrusion grooves 16 are opened on the first valve body 1 and the second valve body 2. Both extrusion grooves 16 are connected to the lower port of the corresponding push groove 11. Pressure blocks 14 are slidably installed in both extrusion grooves 16. A spring 15 is fixedly installed on the lower surface of the pressure block 14, and the lower end of the spring 15 is fixedly installed between the extrusion groove 16.

[0036] The pressure rod 12 is made of 304 stainless steel, which combines strength and corrosion resistance. As the connecting part between piston 13 and pressure block 14, it can realize the stable transmission of axial thrust. The pressure block 14 is made of polytetrafluoroethylene (PTFE) modified material with added carbon fiber to enhance rigidity. Its smooth surface can increase the contact area with the elastic diaphragm 17, so that the thrust is evenly applied to the elastic diaphragm 17 and avoids diaphragm damage caused by excessive local pressure. Spring 15 is made of the same material as spring 21. It can store energy when under pressure. On the one hand, it provides elastic buffer for pressure block 14 to offset the impact of high-pressure hydrogen on sealing gasket 9. On the other hand, it compensates for pressure difference through elastic deformation when pressure fluctuates, ensuring the stability of the clamping force of sealing gasket 9.

[0037] Both the first valve body 1 and the second valve body 2 are fixedly provided with sealing gaskets 9. Y-shaped grooves 24 are opened on the side of the two sealing gaskets 9 that are close to each other, and elastic diaphragms 17 are fixedly provided on the side of the two sealing gaskets 9 that are far from each other. The elastic diaphragms 17 are located on the back side of the corresponding position of the Y-shaped grooves 24 on the sealing gaskets 9.

[0038] The sealing gasket 9 is made of expanded polytetrafluoroethylene (ePTFE) and fluororubber composite material. The outer layer is ePTFE, which has an extremely low coefficient of friction and good sealing performance. The inner layer is fluororubber, which provides elastic support. The composite material has excellent sealing performance, elasticity and resistance to hydrogen embrittlement, avoiding gasket aging caused by hydrogen permeation. The design of the Y-shaped groove 24 provides space for the elastic deformation of the sealing surface. When under pressure, the Y-shaped groove 24 contracts, which can increase the contact area between the sealing surface and the valve ball 8, further improving the sealing effect. The elastic diaphragm 17 is made of fluororubber, with carbon black reinforcing agent added to improve compressive strength and low temperature plasticizer added to improve toughness below -40℃. It has low hydrogen permeability and excellent resistance to hydrogen embrittlement. It can be repeatedly deformed under high pressure of 0-40MPa without permanent deformation, ensuring the accuracy of pressure transmission and the reliability of sealing.

[0039] When the hydrogen pressure increases, the high-pressure hydrogen acts on the sealing surface of the gasket 9, generating an outward thrust, which may cause the sealing surface to separate and leak. At the same time, the high-pressure hydrogen acts on the elastic diaphragm 17 through a tiny gap. Combined with the high-sensitivity pressure sensing characteristics of the titanium alloy piston 13, the piston 13 will undergo a slight downward displacement under pressure, squeezing the pressure rod 12 and pressure block 14 below. At the same time, the pressure is fed back to the piston 18 through the inert gas 10, forming a pressure balance with the spring 21. The deformation of the elastic diaphragm 17 increases, and the clamping force applied to the gasket 9 increases simultaneously, offsetting the thrust of the high-pressure hydrogen on the sealing surface, ensuring that the gasket 9 and the valve ball 8 are always tightly fitted, and the sealing degree increases with the increase of pressure. During this process, the compressibility of the inert gas 10 can absorb the impact of pressure fluctuations, avoid sudden changes in the force on the sealing surface, and ensure sealing stability.

[0040] When the hydrogen pressure decreases, the pressure acting on the elastic diaphragm 17 and piston 13 decreases. The elastic restoring force of spring 15 and spring 21 pushes the relevant components to reset. The inert gas 10 assists piston 13 to move slightly upward. The pressing force of the elastic diaphragm 17 on the sealing gasket 9 decreases accordingly, avoiding wear caused by excessive compression of the sealing surface due to low pressure, and extending the service life of the sealing components. The titanium alloy material of piston 13 ensures the smoothness and accuracy of the reset process, and avoids deformation of itself from affecting the adjustment effect.

[0041] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0042] The specific operation steps of this invention are as follows:

[0043] When the valve needs to be closed, the valve stem 3 is rotated manually or electrically. The valve stem 3 synchronously drives the valve ball 8 and the cam 7 to rotate in their respective cavities. When the valve ball 8 rotates to the 90° position, its outer surface completely covers the through hole between the first valve body 1 and the second valve body 2, blocking the hydrogen flow channel. At the same time, the long shaft end of the elliptical cam 7 gradually rotates to contact the steel ball 23 on the retaining ring 19. As the cam 7 continues to rotate, the long shaft end applies an axial thrust to the retaining ring 19 through the steel ball 23, pushing the piston 18 to slide away from the cam 7 along the push groove 11. The slider 25 slides synchronously along the slide groove 20, providing guidance and limiting for the piston 18 to ensure smooth sliding without deviation. When the piston 18 moves, it compresses the spring 21, which stores energy for subsequent reset. At the same time, the piston 18 compresses the inert gas 10 and pushes the piston 13 to slide downward synchronously.

[0044] Piston 13 drives pressure rod 12 to move downward, and pressure rod 12 pushes pressure block 14 to move downward along extrusion groove 16 and squeeze spring 15; pressure block 14 transmits axial thrust evenly to elastic diaphragm 17 through inert gas 10, elastic diaphragm 17 undergoes elastic deformation, applying uniform pressure to sealing gasket 9, so that the arc-shaped sealing surface of sealing gasket 9 tightly fits the outer surface of valve ball 8. At this time, Y-shaped groove 24 on sealing gasket 9 contracts under pressure, increasing sealing contact area and forming a reliable seal, solving the problem of instantaneous leakage caused by asynchronous opening and closing and sealing of traditional valves.

[0045] When the valve needs to be opened, the valve stem 3 is rotated in the reverse direction. The valve stem 3 drives the valve ball 8 and the cam 7 to rotate in the opposite direction synchronously. The long shaft end of the cam 7 gradually disengages from the steel ball 23, and the thrust on the retaining ring 19 disappears. At this time, the second spring 21 releases its stored energy, pushing the second piston 18 to reset, and the pressure on the first piston 13 is released. The first spring 15 rebounds synchronously, pushing the pressure block 14, the pressure rod 12, and the first piston 13 to reset upward in sequence. The pressure on the elastic diaphragm 17 is released and it returns to its original state. The contact pressure between the sealing gasket 9 and the valve ball 8 disappears, and the two separate, avoiding frictional wear of the sealing surface when the valve is opened. The valve ball 8 continues to rotate to the 90° position, and its internal through hole aligns with the through hole between the first valve body 1 and the second valve body 2, and hydrogen gas resumes flow. At the same time, due to the early separation of the sealing surface and the buffering of the inert gas 10, the frictional resistance between the components is reduced, the force required to open the valve is reduced, and the ease of operation is improved.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure sealing ball valve for hydrogen, comprising a first valve body (1) and a second valve body (2), characterized in that, The first valve body (1) and the second valve body (2) are detachably and fixedly connected. A sealing ring is provided at the connection between the first valve body (1) and the second valve body (2). A valve seat (4) is fixedly connected to the second valve body (2). A valve stem (3) is rotatably arranged inside the valve seat (4). An opening and closing valve mechanism is installed between the first valve body (1) and the second valve body (2). The opening and closing valve mechanism is used to open and close the hydrogen supply. A sealing seat (6) is fixedly installed on the first valve body (1). Connecting rods (5) are fixedly installed on both sides of the valve seat (4). One of the connecting rods (5) is fixedly connected to the second valve body (2), and the other connecting rod (5) is movably connected to the first valve body (1) through the sealing seat (6). The sealing seat (6) is fixedly installed on the first valve body (1). An adaptive sealing mechanism is installed between the first valve body (1), the second valve body (2) and the corresponding connecting rod (5). The adaptive sealing mechanism operates synchronously with the opening and closing action of the valve rod (3) and performs adaptive sealing according to the pressure fluctuation of the high-pressure hydrogen medium on the sealing surface. A cam (7) is fixedly mounted on the valve stem (3). The adaptive sealing mechanism includes a push groove (11) opened in the connecting rod (5). A pressing component is provided in the push groove (11). A piston two (18) is slidably sealed in the upper port of the push groove (11). The piston two (18) can be intermittently pushed by the cam (7). A piston one (13) is slidably mounted in the lower port of the push groove (11). A pressing groove (16) is opened on both the first valve body (1) and the second valve body (2). Both extrusion grooves (16) are connected to the lower port of the corresponding push groove (11). The push groove (11) between piston one (13) and piston two (18) and the extrusion groove (16) are filled with inert gas (10). The first valve body (1) and the second valve body (2) are fixedly provided with sealing gaskets (9) at the positions where they contact the valve ball. The two sealing gaskets (9) are fixedly provided with elastic diaphragms (17) on the side away from each other. The elastic diaphragms (17) partially overlap with the extrusion groove (16).

2. The high-pressure sealing ball valve for hydrogen according to claim 1, characterized in that, The opening and closing valve mechanism includes a valve ball (8) fixedly disposed at the lower end of the valve stem (3), a through hole is formed between the first valve body (1) and the second valve body (2), and the valve ball (8) is rotatably disposed in the through hole.

3. A high-pressure sealing ball valve for hydrogen according to claim 1, characterized in that, The lower end of the connecting rod (5) and the sealing seat (6) are both provided with sealing plates, and the connecting rod (5) is inserted into the sealing seat (6) for sealing.

4. A high-pressure sealing ball valve for hydrogen according to claim 1, characterized in that, The valve seat (4) has a rotating cavity (22) and the cam (7) is rotatably disposed in the rotating cavity (22). The cam (7) is elliptical in shape.

5. A high-pressure sealing ball valve for hydrogen according to claim 4, characterized in that, The pushing groove (11) is connected to the rotating cavity (22).

6. A high-pressure sealing ball valve for hydrogen according to claim 5, characterized in that, The extrusion component includes two grooves (20) formed in the connecting rod (5), both grooves (20) are connected to the push groove (11), a slider (25) is fixedly provided on one side of the piston (18), a retaining ring (19) is fixedly provided at one end of the piston (18) located in the rotating cavity (22), and multiple steel balls (23) are rotatably provided on the side of the retaining ring (19) near the cam (7), and a spring (21) is fixedly provided between the other end of the piston (18) and the push groove (11).

7. A high-pressure sealing ball valve for hydrogen according to claim 6, characterized in that, A pressure rod (12) is fixedly provided at the lower end of the piston (13), and a slider (25) is also fixedly provided on one side of the piston (13), and both sliders (25) are slidably disposed in the corresponding grooves (20).

8. A high-pressure sealing ball valve for hydrogen according to claim 7, characterized in that, A pressure block (14) is slidably disposed in each of the two extrusion grooves (16). A spring (15) is fixedly disposed on the lower surface of the pressure block (14), and the lower end of the spring (15) is fixedly disposed between the extrusion groove (16).

9. A high-pressure sealing ball valve for hydrogen according to claim 1, characterized in that, Both of the two sealing gaskets (9) have Y-shaped grooves (24) on the side that is close to each other.

10. A high-pressure sealing ball valve for hydrogen according to claim 9, characterized in that, The elastic diaphragm (17) is disposed on the back side of the corresponding position of the Y-shaped groove (24) on the sealing gasket (9).

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