Horizontal top-mounted eccentric hemispherical valve

Abstract

This utility model discloses a horizontal, top-mounted eccentric hemispherical valve, comprising a valve body, a valve cover, a spherical crown valve core assembly, a valve seat, and a sealing compensation structure. The valve cover is fixedly installed on the top of the valve body, forming a horizontal, top-mounted structure. The spherical crown valve core is horizontally positioned within the valve cavity, with an upper valve shaft and a lower valve shaft respectively installed at its upper and lower ends. The valve seat is connected to the valve body via the sealing compensation structure, which is located on the back of the valve seat. The sealing compensation structure forms a sealing pair between the valve seat and the spherical surface of the spherical crown valve core. A tail plate is connected to the bottom of the valve body via a tail adjustable mechanism, which allows for axial fine-tuning of the spherical crown valve core. This valve is installed horizontally. This application uses a spring preload and back pressure driven sealing compensation structure, enabling the valve seat to automatically compensate forward after the sealing surface wears, maintaining optimal sealing pressure and greatly extending the valve's service life. It is particularly suitable for abrasive media conditions.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a horizontal top-mounted eccentric hemispherical valve. Background Technology

[0002] Ball valves, as important fluid control devices, are widely used in pipeline systems in petroleum, chemical, power, and water industries. Their core advantages lie in low flow resistance, good sealing performance, and rapid opening and closing. Traditional stationary ball valves are prone to sealing surface wear when operating in media containing particles or prone to scaling, leading to seal failure and a short service life. Although some improved ball valves use resilient seats or spring preload to provide initial sealing force, this preload weakens after long-term wear or frequent opening and closing, also resulting in unreliable sealing.

[0003] Furthermore, in conventional ball valves, the valve core and valve shaft are often an integral structure or fixedly connected. When the valve seat sealing surface wears, the axial position of the valve core cannot be effectively compensated or finely adjusted, leading to the complete scrapping of the valve and high maintenance costs. Insufficient online maintenance capabilities and the inability to adjust the sealing clearance are prominent technical challenges in existing technologies. Utility Model Content

[0004] In view of this, the present invention aims to propose a horizontal top-mounted eccentric hemispherical valve to solve at least one technical problem in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A horizontal, top-mounted eccentric ball valve, comprising a valve body, valve cover, ball crown valve core assembly, valve seat, and sealing compensation structure; The valve cover is fixedly installed on the top of the valve body, forming a horizontal top-mounted structure; The spherical crown valve core is horizontally installed in the valve cavity, and the upper valve shaft and lower valve shaft are respectively installed at the upper and lower ends of the spherical crown valve core; The valve seat is connected to the valve body through a sealing compensation structure. The sealing compensation structure is located on the back of the valve seat. The sealing compensation structure makes the valve seat and the spherical surface of the ball crown valve core form a sealing pair. When the sealing surface is worn or damaged, the valve seat can be pushed towards the ball crown valve core under the action of back pressure to achieve automatic sealing compensation. The bottom of the valve body is connected to a tail plate via a tail adjustable mechanism. The tail adjustable mechanism can make axial fine adjustments to the ball crown valve core. The valve is installed in the horizontal direction.

[0006] Furthermore, the sealing compensation structure includes an R-ring seal, a spring assembly, a mounting block, and a hard sealing block; The valve seat is connected to a mounting block via a first mounting screw on the side near the ball crown valve core, and a gap is formed between the valve seat and the mounting block; an R-type sealing ring is installed on the valve seat, and a hard sealing block is fixedly installed on the valve seat; The spring assembly is located on the back of the valve seat and provides a preload force that presses it against the spherical crown valve core.

[0007] Furthermore, a first pressure plate is fixed to the sealing side of the spherical crown valve core; The valve seat, mounting block, and hard sealing block are provided with inclined surfaces corresponding to the positions of the first pressure plate; the head of the R-type sealing ring abuts against the first pressure plate, and its tail is disposed in the gap between the valve seat and the mounting block; Several first sealing rings are provided between the valve seat and the valve body.

[0008] Furthermore, the head of the R-type sealing ring is spherical, and the tail of the R-type sealing ring is conical.

[0009] Furthermore, the spring assembly is either a compression spring or a disc spring.

[0010] Furthermore, the compression spring component includes a mating screw and a second pressure plate; The back of the valve seat is provided with a first groove for accommodating the compression spring and a second groove for accommodating the second pressure plate. One end of the compression spring acts on the bottom surface of the first groove and the other end acts on the second pressure plate. The valve body is connected to the second pressure plate by a mating screw, and the second pressure plate slides axially within the second groove.

[0011] Furthermore, the butterfly spring component includes a butterfly spring, a third pressure plate, and a second mounting screw; The valve body is provided with a first sliding groove and a fourth recess; One end of the second mounting screw is connected to the back of the valve seat, and the other end passes through the third pressure plate and the butterfly spring and is slidably disposed in the first sliding groove; The butterfly spring is disposed in the fourth groove and acts between the third pressure plate and the bottom surface of the fourth groove.

[0012] Furthermore, the tail adjustable mechanism includes an inner sleeve plate, a lower shaft adjustable pressure plate, and a tail plate; The inner sleeve is connected to the end of the lower valve shaft by a first adjusting screw and a first fastening screw; The lower shaft adjustable pressure plate is connected to the bottom of the valve body via a second adjusting screw; The tail plate is fixed to the side of the lower shaft adjustable pressure plate away from the valve body; by turning the first adjusting screw or the second adjusting screw, the inner sleeve plate can be driven to drive the lower valve shaft to make axial fine adjustments.

[0013] Furthermore, a second sealing ring is provided between the inner sleeve plate and the lower valve shaft; A third sealing ring is provided between the inner sleeve plate and the valve body; A fourth sealing ring is provided between the adjustable pressure plate of the lower shaft and the valve body; A fifth sealing ring is provided between the adjustable pressure plate of the lower shaft and the tail plate.

[0014] Furthermore, the valve cover is bolted with a vent cap; The ball crown valve core is connected to the upper valve shaft by bolts, the lower valve shaft is rotatably connected to the valve body, and a first bushing is provided between the lower valve shaft and the valve body; The ball crown valve core is bolted to the upper valve shaft, and shaft end gaskets are provided between the ball crown valve core and both the lower and upper valve shafts; the upper valve shaft is rotatably connected to the valve body, and a second bushing is provided between the upper valve shaft and the valve body; The extended end of the upper valve shaft is provided with a stuffing box structure, which includes a stuffing pad and a stuffing gland disposed between the upper valve shaft and the valve body.

[0015] Compared with the prior art, the horizontal top-mounted eccentric hemispherical valve of this utility model has the following advantages: This application uses a spring preload and back pressure driven sealing compensation structure, which enables the valve seat to automatically compensate forward after the sealing surface wears, always maintaining the optimal sealing specific pressure, greatly extending the service life of the valve, and is especially suitable for abrasive media conditions.

[0016] The R-shaped flexible sealing ring and the metal hard seal of this application constitute a dual sealing system. The R-shaped sealing ring ensures zero leakage under bidirectional pressure; the metal hard seal serves as a backup, providing an emergency seal in extreme operating conditions or when the flexible seal fails, offering a high degree of safety redundancy.

[0017] The adjustable tail mechanism of this application allows for precise online adjustment of the valve core's axial position (without disassembling the valve) by simply turning the adjusting screw with a tool. This effectively corrects "valve plate sagging" caused by long-term operation, restores the valve's sealing performance, and elevates the valve's maintainability and service life to a whole new level.

[0018] The valve adopts a horizontal, top-mounted structure, with the valve cover installed on top of the valve body for easy installation and maintenance of internal components. The ball-head valve core is horizontally positioned within the valve cavity, supported at both ends by the upper and lower valve shafts respectively, ensuring stable operation of the valve core during opening and closing. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the horizontal top-mounted eccentric hemispherical valve proposed in this utility model; Figure 2 This is a side view of the horizontal top-mounted eccentric hemispherical valve proposed in this utility model. Figure 3 This is a schematic diagram of point A of the horizontal top-mounted eccentric hemispherical valve proposed in this utility model; Figure 4 This is a schematic diagram of point B of the horizontal top-mounted eccentric hemispherical valve proposed in this utility model (the spring assembly is a compression spring group); Figure 5 This is a schematic diagram of point B of the horizontal top-mounted eccentric hemispherical valve proposed in this utility model (the spring assembly is a butterfly spring). Explanation of reference numerals in the attached figures: 1. Valve cover; 2. Valve body; 3. Valve core ball crown; 4. Exhaust port cover; 5. First anti-friction pad; 6. Tail cover; 7. Tail adjustable mechanism; 701. Second sealing ring; 702. Third sealing ring; 703. Fourth sealing ring; 704. Third adjusting screw; 705. First adjusting screw; 706. First fastening screw; 707. Second adjusting screw; 708. Inner sleeve plate; 709. Fifth sealing ring; 8. Lower shaft adjustable pressure plate; 9. Second anti-friction pad; 0. First bushing; 11. Lower shaft valve; 12. Shaft end gasket; 13. Second bushing; 14. Packing gasket; 15. Packing gland; 16. Upper valve shaft; 17. Tail plate; 18. First pressure plate; 19. R-ring seal; 20. Compression spring; 21. Valve seat; 22. Second pressure plate; 23. First mounting screw; 24. Mating screw; 25. Second mounting screw; 26. Butterfly spring; 27. Third pressure plate; 28. Hard sealing block; 29. ​​First sealing ring. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, 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 based on the specific circumstances.

[0024] Example 1 A horizontal, top-mounted eccentric hemispherical valve includes a valve body 2, a valve cover 1, a spherical crown valve core assembly, a valve seat 21, and a sealing compensation structure. The valve cover 1 is fixedly installed on the top of the valve body 2, forming a horizontal, top-mounted structure. The spherical crown valve core is horizontally positioned within the valve cavity, with an upper valve shaft 16 and a lower valve shaft respectively installed at its upper and lower ends. The valve seat 21 is connected to the valve body 2 via the sealing compensation structure, which is located on the back of the valve seat 21. The sealing compensation structure enables the valve seat 21 and the spherical surface of the spherical crown valve core to form a sealing pair. When the sealing surface is worn or damaged, the valve seat 21 can be pushed towards the spherical crown valve core under back pressure to achieve automatic sealing compensation. The bottom of the valve body 2 is connected to a tail plate 17 via a tail adjustable mechanism 7. The tail adjustable mechanism 7 can adjust the axial fine-tuning of the spherical crown valve core. This valve is installed horizontally. The sealing compensation structure includes an R-type sealing ring 19, a spring assembly, a mounting block, and a hard sealing block 28; the valve seat 21 is connected to the mounting block on the side near the ball crown valve core by a first mounting screw 23, and a gap is formed between the valve seat 21 and the mounting block; the R-type sealing ring 19 is mounted on the valve seat 21, and the hard sealing block 28 is fixedly mounted on the valve seat 21; the upper valve shaft 16 is connected to the drive device, and the drive device adopts existing technology (not shown in the figure).

[0025] A spring assembly is disposed on the back of the valve seat 21, providing a preload force to press it against the spherical crown valve core. A first pressure plate 18 is fixed to the sealing side of the spherical crown valve core; the valve seat 21, the mounting block, and the hard sealing block 28 are provided with inclined surfaces corresponding to the position of the first pressure plate 18; the head of the R-type sealing ring 19 abuts against the first pressure plate 18, and its tail is disposed in the gap between the valve seat 21 and the mounting block; a plurality of first sealing rings 29 are provided between the valve seat 21 and the valve body 2.

[0026] The head of the R-type sealing ring 19 is spherical, and the tail of the R-type sealing ring 19 is conical. The spring assembly is one of either a compression spring 20 or a butterfly spring 26. The compression spring 20 includes a mating screw 24 and a second pressure plate 22; the back of the valve seat 21 is provided with a first groove for accommodating the compression spring 20 and a second groove for accommodating the second pressure plate 22, one end of the compression spring 20 acts on the bottom surface of the first groove, and the other end acts on the second pressure plate 22; the valve body 2 is connected to the second pressure plate 22 by the mating screw 24, and the second pressure plate 22 slides axially within the second groove.

[0027] The butterfly spring 26 includes a butterfly spring 26, a third pressure plate 27, and a second mounting screw 25; the valve body 2 is provided with a first sliding groove and a fourth recess; one end of the second mounting screw 25 is connected to the back of the valve seat 21, and the other end passes through the third pressure plate 27 and the butterfly spring 26 and is slidably disposed in the first sliding groove; the butterfly spring 26 is disposed in the fourth recess and acts between the bottom surface of the third pressure plate 27 and the fourth recess.

[0028] The tail adjustable mechanism 7 includes an inner sleeve plate 708, a lower shaft adjustable pressure plate 8, and a tail plate 17. The inner sleeve plate 708 is connected to the end of the lower valve shaft via a first adjusting screw 705 and a first fastening screw 706. The lower shaft adjustable pressure plate 8 is connected to the bottom of the valve body 2 via a second adjusting screw 707. The tail plate 17 is fixed to the side of the lower shaft adjustable pressure plate 8 away from the valve body 2. By turning the first adjusting screw 705 or the second adjusting screw 707, the inner sleeve plate 708 can be driven to drive the lower valve shaft to make axial fine adjustments.

[0029] A second sealing ring 701 is provided between the inner sleeve plate 708 and the lower valve shaft; a third sealing ring 702 is provided between the inner sleeve plate 708 and the valve body 2; a fourth sealing ring 703 is provided between the lower shaft adjustable pressure plate 8 and the valve body 2; and a fifth sealing ring 709 is provided between the lower shaft adjustable pressure plate 8 and the tail plate 17.

[0030] A vent cap 4 is bolted onto the valve cover 1; the spherical valve core is bolted to the upper valve shaft 16, and a first bushing 10 is provided between the lower valve shaft and the valve body 2; the spherical valve core is bolted to the upper valve shaft 16, and shaft end gaskets 12 are provided between the spherical valve core and both the lower and upper valve shafts 16; a second bushing 13 is provided between the upper valve shaft 16 and the valve body 2; a stuffing box structure is provided at the extended end of the upper valve shaft 16, the stuffing box structure including a packing pad and a packing gland 15 disposed between the upper valve shaft 16 and the valve body 2. The core function of the vent cap 4 is to form and maintain pressure balance within the valve cavity and ensure that the sealing compensation system can start and work correctly.

[0031] Example 2 The spring assembly consists of 20 compression springs.

[0032] The compression spring 20 includes a mating screw 24 and a second pressure plate 22; the back of the valve seat 21 is provided with a first groove for accommodating the compression spring 20 and a second groove for accommodating the second pressure plate 22, one end of the compression spring 20 acts on the bottom surface of the first groove, and the other end acts on the second pressure plate 22; the valve body 2 is connected to the second pressure plate 22 by the mating screw 24, and the second pressure plate 22 slides axially in the second groove.

[0033] Example 3 The spring assembly consists of 26 disc springs.

[0034] The butterfly spring 26 includes a butterfly spring 26, a third pressure plate 27, and a second mounting screw 25; the valve body 2 is provided with a first sliding groove and a fourth recess; one end of the second mounting screw 25 is connected to the back of the valve seat 21, and the other end passes through the third pressure plate 27 and the butterfly spring 26 and is slidably disposed in the first sliding groove; the butterfly spring 26 is disposed in the fourth recess and acts between the bottom surface of the third pressure plate 27 and the fourth recess.

[0035] Example 4 The horizontal top-mounted eccentric hemispherical valve mainly includes a valve body 2, a valve cover 1, a ball crown valve core assembly, a valve seat 21, a sealing compensation structure, and a tail adjustable mechanism 7.

[0036] The valve cover 1 is fixed to the top of the valve body 2 by bolts, and the two together form the valve cavity. When it is necessary to repair or replace internal parts, simply remove the bolts on the valve cover 1 above the pipeline, and the entire ball crown valve core assembly and valve seat 21 and other components can be lifted out from the top of the valve body 2 as a whole, without having to disassemble the valve from the pipeline, which greatly facilitates maintenance.

[0037] The spherical crown valve core assembly is the core moving component of the valve. The spherical crown adopts a spherical valve disc (or spherical crown) structure. The upper and lower ends of the spherical crown are fixedly connected to the upper valve shaft 16 and the lower valve shaft respectively by bolts and shaft end washers 12. The upper valve shaft 16 and the lower valve shaft are supported by the second bushing 13 and the first bushing 10 on the valve body 2 to ensure flexible rotation.

[0038] This application employs a double eccentric design. The first eccentricity is a radial offset between the valve shaft axis and the center of the spherical crown. The second eccentricity is an angular offset between the valve shaft axis and the valve passage axis. This design ensures that when the valve is opened, the sealing surface of the spherical crown can completely detach from the valve seat 21, avoiding friction and scraping during opening and closing. When closed, the eccentricity is used to achieve a wedging effect, resulting in a tighter seal as the valve is closed.

[0039] The valve seat 21, as a movable component, is located within the cavity of the valve body 2. A spring assembly (shown as a compression spring 20 or a butterfly spring 26) is mounted on its back (the side away from the ball crown). A mounting block is connected to the side of the valve seat 21 near the ball crown via a first mounting screw 23, creating a specific gap between the valve seat 21 and the mounting block.

[0040] A first pressure plate 18 is fixed to the sealing edge of the spherical crown. The first pressure plate 18 is a metal pressure plate, and the R-type sealing ring 19 is made of rubber.

[0041] Correspondingly, the valve seat 21 and the mounting block are machined with matching bevels. The spherical head of the R-type sealing ring 19 contacts the first pressure plate 18, while its conical tail is embedded in the gap between the valve seat 21 and the mounting block. This design ensures that the head fits snugly and prevents the tail from being squeezed out under high pressure.

[0042] When the valve is closed, the medium pressure acts on the back of the valve seat 21 from the inlet (i.e., back pressure is generated). This back pressure, together with the preload of the spring assembly, pushes the valve seat 21, mounting block, and R-type sealing ring 19 together against the spherical surface of the crown. The higher the pressure, the greater the clamping force, and the better the sealing effect, thus achieving bidirectional sealing. After long-term use, if the R-type sealing ring 19 wears, the gap between the sealing pairs will increase. At this time, the back pressure will push the valve seat 21 to overcome the spring force and move forward (towards the crown) a small distance until it is re-tightened, automatically compensating for the wear and ensuring the long-term effectiveness of the seal. When the valve is opened, the back pressure drops rapidly, the spring force causes the valve seat 21 assembly to retract slightly, and at the same time, the R-type sealing ring 19 retracts due to its own elasticity, causing it to quickly disengage from the first pressure plate 18, greatly reducing the opening torque and reducing frictional damage.

[0043] The tail adjustable mechanism 7 is adjusted as follows: The tail adjustable mechanism 7 is located at the bottom of the valve body 2. The inner sleeve plate 708 is connected to the end of the lower valve shaft via the first adjusting screw 705 and the first fastening screw 706. The lower shaft adjustable pressure plate 8 is connected to the valve body 2 via the second adjusting screw 707. The tail plate 17 is fixed to the outside of the lower shaft adjustable pressure plate 8.

[0044] The mechanism incorporates multiple sealing rings and anti-friction pads to ensure that while the regulating mechanism is movable, the external seal of the valve is absolutely reliable.

[0045] During the initial valve installation, the height of the adjustable pressure plate 8 on the lower shaft can be roughly adjusted by turning the second adjusting screw 707. This will cause the inner sleeve plate 708 and the lower valve shaft to move up and down, eliminating manufacturing and assembly errors and ensuring the ball crown is in the optimal sealing position. After the valve has been running for a period of time, if it sags slightly due to its own weight, resulting in incomplete closure, the first fastening screw 706 can be loosened, and then the first adjusting screw 705 can be turned. Since the first adjusting screw 705 is threaded onto the lower valve shaft, rotating it will precisely pull or push the lower valve shaft for axial fine-tuning, thereby raising the ball crown back to the correct position. After adjustment, tightening the first fastening screw 706 will lock it in place. This operation can be performed while the valve is online (without being removed from the pipeline), achieving maintenance without disassembly.

[0046] The portion of the upper valve stem 16 extending out of the valve body 2 is equipped with a stuffing box structure, including a packing gasket and a packing gland 15. By tightening the packing gland 15, the internal soft packing (not shown in the figure) can be compressed to form a reliable dynamic seal, preventing the medium from leaking along the valve stem.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A horizontal, top-mounted eccentric hemispherical valve, characterized in that: Includes valve body, valve cover, ball crown valve core assembly, valve seat, and sealing compensation structure; The valve cover is fixedly installed on the top of the valve body, forming a horizontal top-mounted structure; The spherical crown valve core is horizontally installed in the valve cavity, and the upper valve shaft and lower valve shaft are respectively installed at the upper and lower ends of the spherical crown valve core; The valve seat is connected to the valve body through a sealing compensation structure. The sealing compensation structure is located on the back of the valve seat. The sealing compensation structure makes the valve seat and the spherical surface of the ball crown valve core form a sealing pair. When the sealing surface is worn or damaged, the valve seat can be pushed towards the ball crown valve core under the action of back pressure to achieve automatic sealing compensation. The bottom of the valve body is connected to a tail plate via a tail adjustable mechanism. The tail adjustable mechanism can make axial fine adjustments to the ball crown valve core. The valve is installed in the horizontal direction. The tail adjustable mechanism includes an inner sleeve plate, a lower shaft adjustable pressure plate, and a tail plate; The inner sleeve is connected to the end of the lower valve shaft by a first adjusting screw and a first fastening screw; The lower shaft adjustable pressure plate is connected to the bottom of the valve body via a second adjusting screw; The tail plate is fixed to the side of the lower shaft adjustable pressure plate away from the valve body; by turning the first adjusting screw or the second adjusting screw, the inner sleeve plate can be driven to drive the lower valve shaft to make axial fine adjustments.

2. The horizontal top-mounted eccentric hemispherical valve according to claim 1, characterized in that: The sealing compensation structure includes an R-ring seal, a spring assembly, a mounting block, and a hard sealing block; The valve seat is connected to a mounting block via a first mounting screw on the side near the ball crown valve core, and a gap is formed between the valve seat and the mounting block; an R-type sealing ring is installed on the valve seat, and a hard sealing block is fixedly installed on the valve seat; The spring assembly is located on the back of the valve seat and provides a preload force that presses it against the spherical crown valve core.

3. The horizontal top-mounted eccentric hemispherical valve according to claim 2, characterized in that: A first pressure plate is fixed to the sealing side of the spherical crown valve core; The valve seat, mounting block, and hard sealing block are provided with inclined surfaces corresponding to the positions of the first pressure plate; the head of the R-type sealing ring abuts against the first pressure plate, and its tail is disposed in the gap between the valve seat and the mounting block; Several first sealing rings are provided between the valve seat and the valve body.

4. The horizontal top-mounted eccentric hemispherical valve according to claim 3, characterized in that: The head of the R-type seal is spherical, and the tail of the R-type seal is conical.

5. The horizontal top-mounted eccentric hemispherical valve according to claim 3, characterized in that: The spring assembly is either a compression spring or a disc spring.

6. The horizontal top-mounted eccentric hemispherical valve according to claim 5, characterized in that: The compression spring component includes a mating screw and a second pressure plate; The back of the valve seat is provided with a first groove for accommodating the compression spring and a second groove for accommodating the second pressure plate. One end of the compression spring acts on the bottom surface of the first groove and the other end acts on the second pressure plate. The valve body is connected to the second pressure plate by a mating screw, and the second pressure plate slides axially within the second groove.

7. The horizontal top-mounted eccentric hemispherical valve according to claim 5, characterized in that: The butterfly spring assembly includes a butterfly spring, a third pressure plate, and a second mounting screw; The valve body is provided with a first sliding groove and a fourth recess; One end of the second mounting screw is connected to the back of the valve seat, and the other end passes through the third pressure plate and the butterfly spring and is slidably disposed in the first sliding groove; The butterfly spring is disposed in the fourth groove and acts between the third pressure plate and the bottom surface of the fourth groove.

8. The horizontal top-mounted eccentric hemispherical valve according to claim 1, characterized in that: A second sealing ring is provided between the inner sleeve plate and the lower valve shaft; A third sealing ring is provided between the inner sleeve plate and the valve body.

9. The horizontal top-mounted eccentric hemispherical valve according to claim 8, characterized in that: A fourth sealing ring is provided between the adjustable pressure plate of the lower shaft and the valve body; A fifth sealing ring is provided between the adjustable pressure plate of the lower shaft and the tail plate.

10. The horizontal top-mounted eccentric hemispherical valve according to claim 9, characterized in that: The valve cover is equipped with a vent cap on the bolts; The ball-head valve core is connected to the upper valve shaft by bolts, the valve body is rotatably connected to the lower valve shaft, and a first bushing is provided between the lower valve shaft and the valve body; The ball crown valve core is bolted to the upper valve shaft, and shaft end gaskets are provided between the ball crown valve core and both the lower and upper valve shafts; the upper valve shaft is rotatably connected to the valve body, and a second bushing is provided between the upper valve shaft and the valve body; The extended end of the upper valve shaft is provided with a stuffing box structure, which includes a stuffing pad and a stuffing gland disposed between the upper valve shaft and the valve body.

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