A stem anti-flyout structure for a hemispherical valve

Abstract

This utility model provides a valve stem anti-flyout structure for a hemispherical valve, comprising: a valve body with a rotatable hemispherical core; a valve stem connected to the hemispherical core; a valve seat disposed within the valve body; and an axial limiting assembly including a retaining ring and a limiting ring. The retaining ring is disposed on the valve stem, and the valve body has a limiting groove for installing the limiting ring. The limiting ring is located between the valve stem and the valve body, and abuts against the retaining ring along the axial direction of the valve stem. The limiting ring includes at least two arc-shaped components. By designing the limiting ring as at least two arc-shaped components, each arc-shaped component can be installed with the limiting groove, allowing for convenient installation of the limiting ring and the limiting groove within the valve body's through-hole. During disassembly, the valve body can be struck to cause the arc-shaped components to fall from the limiting groove between the valve stem and the valve body, facilitating disassembly. The abutting engagement between the retaining ring and the limiting ring effectively restricts the axial movement of the valve stem, preventing the valve stem from flying out under high-pressure conditions and reducing safety risks.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve stem anti-flyout structure for a hemispherical valve. Background Technology

[0002] In the structure of a ball valve, the valve stem, as the core component connecting the actuator and the ball, not only needs to transmit the torque output by the actuator to realize the rotation and opening and closing of the ball, but also needs to maintain a stable axial position under the action of medium pressure to prevent the valve stem from flying out of the valve body due to excessive medium pressure or fluctuations in operating conditions, which could lead to serious safety accidents such as medium leakage, equipment damage, or even personal injury.

[0003] Currently, existing anti-flyout structures for hemispherical valve stems typically involve setting a limiting ring on the valve body, machining a limiting annular groove on the valve stem, and installing a retaining ring within the limiting annular groove. The retaining ring and the limiting ring abut against each other along the valve stem axially, thus limiting the valve stem and preventing it from flying out. However, because the retaining ring needs to abut against the limiting ring along the valve stem axially to achieve this limitation, the diameter of the retaining ring must be larger than the diameter of the valve stem, and the retaining ring must be installed below the limiting ring. This makes the assembly of the retaining ring difficult, resulting in low overall valve assembly efficiency. Summary of the Invention

[0004] This utility model provides a stem anti-flyout structure for a hemispherical valve to solve the problem that the retaining ring in the existing stem anti-flyout structure of hemispherical valves is difficult to assemble, resulting in low assembly efficiency of the entire valve.

[0005] This utility model provides a valve stem anti-flyout structure for a hemispherical valve, comprising: The valve body is provided with a medium flow channel, and the valve body is provided with a through hole along the radial direction of the medium flow channel; A hemispherical core is rotatably mounted within the valve body; A valve stem passes through the through hole and is connected to the hemispherical core. The valve stem is used to drive the hemispherical core to rotate, thereby switching the opening and closing of the medium flow channel. A bushing is disposed between the valve stem and the through hole, and the valve stem is rotatably connected to the through hole via the bushing; A valve seat is disposed in the valve body, and the valve seat is used to cooperate with the hemispherical core to seal the medium flow channel; An axial limiting assembly includes a first gasket, a retaining ring, and a limiting ring. The retaining ring is disposed on the valve stem. The first gasket is located between the retaining ring and the bushing along the axial direction of the valve stem. The first gasket and the end face of the bushing along the axial direction of the valve stem abut against each other. The through hole has a limiting groove formed radially, the limiting groove extends circumferentially along the through hole, the limiting ring is installed in the limiting groove, the limiting ring abuts against the retaining ring along the axial direction of the valve stem, and the limiting ring includes at least two arc-shaped components, which are connected to form a complete limiting ring.

[0006] In one embodiment of this utility model, the limiting ring includes four arc-shaped components.

[0007] In one embodiment of the present invention, a packing component is provided between the valve stem and the through hole, and the packing component is used to seal the gap between the valve stem and the through hole.

[0008] In one embodiment of the present invention, the axial limiting component further includes a washer and a second washer. The washer abuts against the retaining ring and the limiting ring along the axial direction of the valve stem, respectively. The second washer is located between the washer and the packing component along the axial direction of the valve stem, and abuts against the washer and the packing component along the axial direction of the valve stem, respectively.

[0009] In one embodiment of the present invention, the washer has an L-shaped cross-section and includes a first abutting surface and a second abutting surface. The first abutting surface abuts against the retaining ring, and the second abutting surface abuts against the limiting ring.

[0010] In one embodiment of this utility model, the arc-shaped component has an L-shaped cross-section. The arc-shaped component includes a first part and a second part. The first part is located in the limiting groove, and the second part is located in the through hole. The width of the first part along the valve stem axial direction is less than the groove width of the limiting groove, and the width of the second part along the valve stem axial direction is equal to the groove width of the limiting groove. One end of the second part along the valve stem axial direction abuts against the second abutting surface, and the other end is used to abut against the retaining ring.

[0011] In one embodiment of the present invention, the valve body includes a main valve body and a secondary valve body, the main valve body is connected to the secondary valve body, a stop sealing gasket is provided at the connection position between the main valve body and the secondary valve body, the valve stem is disposed on the main valve body, and the valve seat is disposed on the secondary valve body.

[0012] In one embodiment of this utility model, the valve seat and the secondary valve body are connected by bolts, the valve seat is located in the valve receiving cavity formed by the connection of the main valve body and the secondary valve body, and the inner diameter of the valve seat is consistent with the diameter of the medium flow channel.

[0013] In one embodiment of this utility model, the valve seat is provided with a first step, a second step and a third step in sequence along the axial direction of the medium flow channel. The second step abuts against the sub-valve body. A first sealing groove is formed between the first step and the sub-valve body. The first sealing groove is used to install a first sealing ring. A second sealing groove is formed between the third step and the sub-valve body. The second sealing groove is used to install a second sealing ring. The first sealing ring and the second sealing ring are used to seal the connection gap between the valve seat and the sub-valve body.

[0014] In one embodiment of the present invention, a sealing compensation component is further included. The sealing compensation component includes a retaining ring and a compression spring. The secondary valve body is provided with a mounting groove. The compression spring is installed in the mounting groove along the axial direction of the medium flow channel. One end of the retaining ring abuts against the compression spring, and the other end abuts against the second sealing ring.

[0015] The beneficial effects of this utility model are as follows: This utility model proposes a valve stem anti-flyout structure for a hemispherical valve. By designing the limiting ring as at least two arc-shaped components, which are connected to form a complete limiting ring, the limiting ring can be installed in the limiting groove within the valve body through-hole. After individual arc-shaped components are installed, multiple arc-shaped components form a complete limiting ring within the limiting groove. This allows for convenient installation of the limiting ring in the limiting groove within the valve body through-hole. During disassembly, the valve body can be tapped to cause the arc-shaped components to fall from the limiting groove into the through-hole, facilitating easy removal. The first gasket placed between the retaining ring and the bushing effectively prevents rigid contact between the retaining ring and the bushing, buffering axial pressure. Through the abutment between the retaining ring and the limiting ring, the limiting ring is subjected to the axial force of the retaining ring. Since the limiting ring is installed within the limiting groove, the axial force of the limiting ring is dispersed to the valve body through the limiting groove, effectively limiting the axial movement of the valve stem and preventing the valve stem from flying out under high-pressure conditions, thus reducing safety risks. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 A cross-sectional schematic diagram of the valve stem anti-flyout structure of a hemispherical valve provided in an embodiment of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure of section A in the middle; Figure 3 for Figure 1Enlarged schematic diagram of the structure of section B in the middle; Figure 4 This is a top view of the limiting ring in the valve stem anti-flyout structure of a hemispherical valve provided in an embodiment of the present invention.

[0018] The attached figures are labeled as follows: Medium flow channel 101, main valve body 102, limiting groove 102a, auxiliary valve body 103, mounting groove 103a, hemispherical core 2, valve stem 3, bushing 4, valve seat 5, first step 501, second step 502, third step 503, first gasket 6, retaining ring 7, limiting ring 8, arc-shaped component 801, first part 801a, second part 801b, packing component 9, gasket 10, first abutment surface 1001, second abutment surface 1002, second gasket 11, stop sealing gasket 12, valve receiving cavity 13, first sealing ring 14, second sealing ring 15, retaining ring 16, compression spring 17. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] Please combine Figures 1 to 4 As shown, this utility model provides a valve stem anti-flyout structure for a hemispherical valve.

[0023] In an exemplary embodiment of this application, the anti-flyout structure of the valve stem 3 of the hemispherical valve includes: The valve body is provided with a medium flow channel 101, and the valve body is provided with a through hole along the radial direction of the medium flow channel 101; Hemispherical core 2 is rotatably mounted inside the valve body; The valve stem 3 passes through the through hole and is connected to the hemispherical core 2. The valve stem 3 is used to drive the hemispherical core 2 to rotate, so as to switch the opening and closing of the medium flow channel 101. A bushing 4 is disposed between the valve stem 3 and the through hole, and the valve stem 3 is rotatably connected to the through hole through the bushing 4. Valve seat 5 is disposed in the valve body and is used to cooperate with hemispherical core 2 to seal the medium flow channel 101; The axial limiting assembly includes a first gasket 6, a retaining ring 7, and a limiting ring 8. The retaining ring 7 is disposed on the valve stem 3. The first gasket 6 is located between the retaining ring 7 and the bushing 4 along the axial direction of the valve stem 3. The first gasket 6 and the end face of the bushing 4 along the axial direction of the valve stem 3 abut against each other. A limiting groove 102a is formed radially in the through hole. The limiting groove 102a extends circumferentially in the through hole. A limiting ring 8 is installed in the limiting groove 102a. The limiting ring 8 abuts against the retaining ring 7 along the axial direction of the valve stem 3. The limiting ring 8 includes at least two arc-shaped components 801. The at least two arc-shaped components 801 are connected to form a complete limiting ring 8.

[0024] In this embodiment, by designing the limiting ring 8 as at least two arc-shaped components 801, and connecting them to form a complete limiting ring 8, the limiting ring 8 can be installed with the limiting groove 102a in the valve body through hole by installing a single arc-shaped component 801. After multiple arc-shaped components 801 are installed in the limiting groove 102a, a complete limiting ring 8 is formed in the limiting groove 102a. This allows the limiting ring 8 to be easily installed with the limiting groove 102a in the valve body through hole. When disassembling, the valve body can be tapped to make the arc-shaped component 801 fall from the limiting groove 102a into the through hole, thus facilitating disassembly. By setting the first gasket 6 between the retaining ring 7 and the bushing 4, rigid contact between the retaining ring 7 and the bushing 4 can be effectively avoided, thus buffering axial pressure. Through the abutting cooperation between the retaining ring 7 and the limiting ring 8, the limiting ring 8 is subjected to the axial force of the retaining ring 7. Since the limiting ring 8 is installed in the limiting groove 102a, the axial force of the limiting ring 8 is dispersed to the valve body through the limiting groove 102a, thereby effectively restricting the axial movement of the valve stem 3, preventing the valve stem 3 from flying out under high pressure conditions, and reducing safety risks.

[0025] In one exemplary embodiment of this application, the limiting ring 8 includes four arc-shaped components 801.

[0026] In this embodiment, the limiting ring 8 is divided into four equal parts by wire cutting. The segmented structure of the limiting ring 8 can be directly inserted into the limiting groove 102a from the radial direction of the valve stem 3 without disassembling the valve body or the entire structure of the valve stem 3. Installation can still be completed in a narrow space.

[0027] In an exemplary embodiment of this application, a packing component 9 is provided between the valve stem 3 and the through hole, and the packing component 9 is used to seal the gap between the valve stem 3 and the through hole.

[0028] In this embodiment, the fluid medium inside the valve is prevented from leaking out from the mating point between the valve stem 3 and the through hole by the compression deformation of the packing to fill the gap.

[0029] In an exemplary embodiment of this application, the axial limiting assembly further includes a washer 10 and a second gasket 11. The washer 10 abuts against the retaining ring 7 and the limiting ring 8 along the axial direction of the valve stem 3, respectively. The second gasket 11 is located between the washer 10 and the packing component 9 along the axial direction of the valve stem 3, and abuts against the washer 10 and the packing component 9 along the axial direction of the valve stem 3, respectively.

[0030] In an exemplary embodiment of this application, the cross-section of the washer 10 is L-shaped. The washer 10 includes a first abutting surface 1001 and a second abutting surface 1002. The first abutting surface 1001 abuts against the retaining ring 7, and the second abutting surface 1002 abuts against the limiting ring 8.

[0031] In this embodiment, the gasket 10 abuts against the retaining ring 7 via the first abutting surface 1001, and the second abutting surface 1002 abuts against the limiting ring 8. In the initial state after installation, there is a slight gap between the limiting ring 8 and the retaining ring 7. When the valve stem 3 moves axially under the action of medium pressure, the gasket 10 preferentially bears the axial force and squeezes the second gasket 11. By setting the second gasket 11 between the gasket 10 and the packing component 9, direct contact between the gasket 10 and the packing component 9 is avoided. When the gasket 10 is insufficient to limit the axial force of the valve stem 3, the retaining ring 7 abuts against the limiting ring 8, and the limiting ring 8 bears the axial force of the valve stem 3 and disperses it to the valve body through the limiting groove 102a, thereby limiting the axial movement of the valve stem 3.

[0032] In an exemplary embodiment of this application, the arc-shaped component 801 has an L-shaped cross-section. The arc-shaped component 801 includes a first part 801a and a second part 801b. The first part 801a is located in the limiting groove 102a, and the second part 801b is located in the through hole. The width of the first part 801a along the axial direction of the valve stem 3 is less than the groove width of the limiting groove 102a. The width of the second part 801b along the axial direction of the valve stem 3 is equal to the groove width of the limiting groove 102a. One end of the second part 801b along the axial direction of the valve stem 3 abuts against the second abutting surface 1002, and the other end is used to abut against the retaining ring 7.

[0033] In this embodiment, the width of the first part 801a along the axial direction of the valve stem 3 is less than the width of the limiting groove 102a, and the width of the first part 801a along the radial direction of the valve stem 3 is the same as the depth of the limiting groove 102a, making it easy for the first part 801a to enter the limiting groove 102a, which facilitates the installation of the limiting ring 8 and the limiting groove 102a. The second part 801b is located outside the limiting groove 102a and inside the through hole, and the width of the second part 801b along the axial direction of the valve stem 3 is equal to the width of the groove, which extends the force path of the second part 801b and enhances the axial force capacity of the limiting ring 8.

[0034] In an exemplary embodiment of this application, the valve body includes a main valve body 102 and a secondary valve body 103. The main valve body 102 is connected to the secondary valve body 103. A stop sealing gasket 12 is provided at the connection position between the main valve body 102 and the secondary valve body 103. The valve stem 3 is disposed on the main valve body 102, and the valve seat 5 is disposed on the secondary valve body 103.

[0035] In this embodiment, the valve body adopts a split structure, which makes it easy to install the hemispherical core 2 and the valve seat 5 inside the valve body; the main valve body 102 and the auxiliary valve body 103 are connected by a flange. By setting a stop sealing gasket 12 at the flange connection position of the main valve body 102 and the auxiliary valve body 103, leakage of the medium at the flange connection position of the main valve body 102 and the auxiliary valve body 103 can be effectively prevented.

[0036] In an exemplary embodiment of this application, the valve seat 5 is connected to the secondary valve body 103 by bolts. The valve seat 5 is located in the valve receiving cavity 13 formed by the connection of the main valve body 102 and the secondary valve body 103. The inner diameter of the valve seat 5 is consistent with the diameter of the medium flow channel 101.

[0037] In this embodiment, due to the connection between the valve body and the pipeline flange, the flow channel of the valve seat 5 needs to be necked in order to process the threaded structure of the fixing valve seat 5 blocking part, and full bore cannot be achieved. In this embodiment, by installing the valve seat 5 inside the valve body, the inner diameter of the valve seat 5 can be designed to be consistent with the diameter of the medium flow channel 101, thereby achieving full bore.

[0038] In an exemplary embodiment of this application, the valve seat 5 is provided with a first step 501, a second step 502 and a third step 503 sequentially along the axial direction of the medium flow channel 101. The second step 502 abuts against the sub-valve body 103. A first sealing groove is formed between the first step 501 and the sub-valve body 103. The first sealing groove is used to install the first sealing ring 14. A second sealing groove is formed between the third step 503 and the sub-valve body 103. The second sealing groove is used to install the second sealing ring 15. The first sealing ring 14 and the second sealing ring 15 are used to seal the connection gap between the valve seat 5 and the sub-valve body 103.

[0039] In this embodiment, the valve seat 5 is connected to the secondary valve body 103 by bolts. The second step 502 on the valve seat 5 abuts against the secondary valve body 103. After the valve seat 5 is installed, the secondary valve body 103 is flange-connected to the main valve body 102. The valve seat 5 is located in the valve receiving cavity 13 formed by the connection between the main valve body 102 and the secondary valve body 103. A first sealing groove for installing the first sealing ring 14 is formed between the first step 501 on the valve seat 5 and the secondary valve body 103. A second sealing groove for installing the second sealing ring 15 is formed between the third step 503 on the valve seat 5 and the secondary valve body 103. The first sealing ring 14 and the second sealing ring 15 form a double seal between the valve seat 5 and the secondary valve body 103 to prevent leakage of the medium at the connection position between the valve seat 5 and the secondary valve body 103.

[0040] In an exemplary embodiment of this application, a sealing compensation component is also included. The sealing compensation component includes a retaining ring 16 and a compression spring 17. The sub-valve body 103 is provided with a mounting groove 103a. The compression spring 17 is installed in the mounting groove 103a. Along the axial direction of the medium flow channel 101, one end of the retaining ring 16 abuts against the compression spring 17, and the other end abuts against the second sealing ring 15.

[0041] In this embodiment, the compression spring 17 is installed in the mounting groove 103a, with one end abutting against the retaining ring 16. The retaining ring 16 has an L-shaped structure, with a portion of the retaining ring 16 entering the second sealing groove and abutting against the second sealing ring 15 to provide sealing pre-tightening force for the second sealing ring 15. The initial state of the compression spring 17 is a compressed state, and the retaining ring 16 provides sealing pre-tightening force for the second sealing ring 15 through the rebound force of the compression spring 17. There is a slight gap between the portion of the retaining ring 16 outside the second sealing groove and the valve seat 5. When the valve has been running for a long time, the second sealing ring 15 may be worn out under the scouring of the medium. The compression spring 17 pushes the retaining ring 16 to move closer to the valve seat 5 to compensate for the sealing performance of the second sealing ring 15.

[0042] The working principle is as follows: by designing the limiting ring 8 as at least two arc-shaped components 801, the structural design of forming a complete limiting ring 8 through connection, the limiting ring 8 and the limiting groove 102a in the valve body through hole can be installed by installing a single arc-shaped component 801. After multiple arc-shaped components 801 are installed in the limiting groove 102a, a complete limiting ring 8 is formed, which makes it easy to install the limiting ring 8 and the limiting groove 102a in the valve body through hole. When disassembling, the valve body can be tapped to make the arc-shaped component 801 fall from the limiting groove 102a into the through hole, thus facilitating disassembly. By setting the first gasket 6 between the retaining ring 7 and the bushing 4, rigid contact between the retaining ring 7 and the bushing 4 can be effectively avoided, thus buffering axial pressure. Through the abutting cooperation between the retaining ring 7 and the limiting ring 8, the limiting ring 8 is subjected to the axial force of the retaining ring 7. Since the limiting ring 8 is installed in the limiting groove 102a, the axial force of the limiting ring 8 is dispersed to the valve body through the limiting groove 102a, thereby effectively restricting the axial movement of the valve stem 3, preventing the valve stem 3 from flying out under high pressure conditions, and reducing safety risks.

[0043] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A stem anti-flyout structure for a hemispherical valve, characterized in that, include: The valve body is provided with a medium flow channel, and the valve body is provided with a through hole along the radial direction of the medium flow channel; A hemispherical core is rotatably mounted within the valve body; A valve stem passes through the through hole and is connected to the hemispherical core. The valve stem is used to drive the hemispherical core to rotate, thereby switching the on and off of the medium flow channel. A bushing is disposed between the valve stem and the through hole, and the valve stem is rotatably connected to the through hole via the bushing; A valve seat is disposed in the valve body, and the valve seat is used to cooperate with the hemispherical core to seal the medium flow channel; An axial limiting assembly includes a first gasket, a retaining ring, and a limiting ring. The retaining ring is disposed on the valve stem. The first gasket is located between the retaining ring and the bushing along the axial direction of the valve stem. The first gasket and the end face of the bushing along the axial direction of the valve stem abut against each other. The through hole has a limiting groove formed radially, the limiting groove extends circumferentially along the through hole, the limiting ring is installed in the limiting groove, the limiting ring abuts against the retaining ring along the axial direction of the valve stem, and the limiting ring includes at least two arc-shaped components, which are connected to form a complete limiting ring.

2. The stem anti-flyout structure of the hemispherical valve according to claim 1, characterized in that: The limiting ring includes four arc-shaped components.

3. The stem anti-flyout structure of the hemispherical valve according to claim 1, characterized in that: A packing component is provided between the valve stem and the through hole, and the packing component is used to seal the gap between the valve stem and the through hole.

4. The stem anti-flyout structure of the hemispherical valve according to claim 3, characterized in that: The axial limiting assembly further includes a washer and a second washer. The washer abuts against the retaining ring and the limiting ring along the axial direction of the valve stem, respectively. The second washer is located between the washer and the packing component along the axial direction of the valve stem, and abuts against the washer and the packing component along the axial direction of the valve stem, respectively.

5. The stem anti-flyout structure of the hemispherical valve according to claim 4, characterized in that: The washer has an L-shaped cross-section and includes a first abutting surface and a second abutting surface. The first abutting surface abuts against the retaining ring, and the second abutting surface abuts against the limiting ring.

6. The stem anti-flyout structure of the hemispherical valve according to claim 5, characterized in that: The arc-shaped component has an L-shaped cross-section and includes a first part and a second part. The first part is located in the limiting groove, and the second part is located in the through hole. The width of the first part along the valve stem axial direction is less than the groove width of the limiting groove, and the width of the second part along the valve stem axial direction is equal to the groove width of the limiting groove. One end of the second part along the valve stem axial direction abuts against the second abutting surface, and the other end is used to abut against the retaining ring.

7. The stem anti-flyout structure of the hemispherical valve according to claim 1, characterized in that: The valve body includes a main valve body and a secondary valve body. The main valve body is connected to the secondary valve body. A stop sealing gasket is provided at the connection position between the main valve body and the secondary valve body. The valve stem is disposed on the main valve body, and the valve seat is disposed on the secondary valve body.

8. The stem anti-flyout structure of the hemispherical valve according to claim 7, characterized in that: The valve seat is bolted to the auxiliary valve body. The valve seat is located in the valve accommodating cavity formed by the connection between the main valve body and the auxiliary valve body. The inner diameter of the valve seat is the same as the diameter of the medium flow channel.

9. The stem anti-flyout structure of the hemispherical valve according to claim 8, characterized in that: The valve seat is provided with a first step, a second step and a third step in sequence along the axial direction of the medium flow channel. The second step abuts against the sub-valve body. A first sealing groove is formed between the first step and the sub-valve body. The first sealing groove is used to install a first sealing ring. A second sealing groove is formed between the third step and the sub-valve body. The second sealing groove is used to install a second sealing ring. The first sealing ring and the second sealing ring are used to seal the connection gap between the valve seat and the sub-valve body.

10. The stem anti-flyout structure of the hemispherical valve according to claim 9, characterized in that: It also includes a sealing compensation component, which includes a retaining ring and a compression spring. The secondary valve body is provided with a mounting groove, and the compression spring is installed in the mounting groove along the axial direction of the medium flow channel. One end of the retaining ring abuts against the compression spring, and the other end abuts against the second sealing ring.

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