Soft seal ball valve

Abstract

The utility model provides a soft seal ball valve, which relates to the technical field of ball valves and comprises a valve body and a ball body, a blow-down valve is arranged in the middle of the bottom of the valve body, a valve cover is arranged at the lower end of the blow-down valve, a first double-end bolt is arranged between the valve cover and the lower port of the blow-down valve, a first hexagon nut is arranged at the outer end of the first double-end bolt, and a second hexagon nut is arranged at the outer end of the second double-end bolt. A ball body is rotationally and movably arranged in the center in the valve cover, a valve rod is installed in the middle of the upper portion of the ball body, the middle of the valve rod is sleeved with a front cover, the upper end of the front cover is fixed to the lower portion of a connecting disc, and the connecting disc is installed on the lower portion of the turbine. Two O-shaped sealing rings are respectively arranged inside and outside the self-lubricating bearing and the packing box, and V-shaped packing made of PTFE (polytetrafluoroethylene) is preset in the packing box, so that the reliability and feasibility of the sealing performance of the valve shaft are ensured; meanwhile, the PTFE valve seat and the valve rod self-lubricating bearing which are small in friction coefficient and good in self-lubricating performance are adopted, the valve can be operated conveniently, flexibly and freely for a long time, and the valve is safer and more durable.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and specifically to a soft-seal ball valve. Background Technology

[0002] In the field of hydropower stations, a ball valve should be classified as a gate valve. It refers to a valve that uses a ball with a circular through-hole as its opening and closing element. The ball rotates with the valve stem to achieve the opening and closing action. A ball valve is a type of valve that utilizes a ball with a circular through-hole as its opening and closing element; the ball rotates with the valve stem to open or close the valve.

[0003] The specification of an antistatic soft-seal ball valve in the prior art (publication number CN220850828U) mentions that "a fixing ring is welded to one side of the valve body, an installation mechanism is provided on one side of the fixing ring, valve seats are welded to both ends of the inner wall of the valve body, a ball valve is installed at the end of the valve seat away from the valve body, an adjustment mechanism is fixedly connected to the top of the ball valve, a through groove is opened at the bottom of the ball valve, and an antistatic mechanism is rolled inside the through groove." However, the valve stem in the ball valve of the prior art is not flexible or cannot be opened, and the sealing surface may leak, making it unsafe, stable, and practical. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a soft-seal ball valve is provided to solve the problems of the valve stem being unable to rotate smoothly or open, and the sealing surface potentially leaking, making it unsafe, unstable, and impractical.

[0005] To achieve the above objectives, a soft-seal ball valve is provided, comprising a valve body and a ball. A drain valve is disposed at the bottom center of the valve body, and a valve cover is disposed at the lower end of the drain valve. A first double-ended bolt is installed between the valve cover and the lower port of the drain valve, and a first hexagonal nut is installed at the outer end of the first double-ended bolt. A ball is rotatably mounted inside the center of the valve cover, and a valve stem is installed at the upper center of the ball. The middle part of the valve stem is fitted inside a front cover, and the upper end of the front cover is fixed to the lower part of a connecting plate. The connecting plate is installed at the lower part of a turbine.

[0006] Furthermore, a metal sheet is provided between the valve cover and the valve body, and the metal sheet is a detachable structure, and the valve body and the valve cover are detachably connected.

[0007] Furthermore, a valve seat support ring is fitted inside the bottom of the valve body, and a valve seat is provided between the inner side of the valve seat support ring and the outer side of the ball. A spring is provided on the outer side of the valve seat support ring, and an O-ring is provided on the lower side of the valve seat support ring.

[0008] Furthermore, the sphere has a through hole at its center, and the centers of the turbine, front cover, valve stem, and sphere are all located on the same axis. A sliding bearing is provided between the upper part of the sphere and the lower part of the front cover.

[0009] Furthermore, packing is installed between the valve stem, the front cover, and the connecting plate, and an internal hexagon screw is installed between the upper part of the front cover and the upper part of the valve body. A second double-ended bolt is installed between the connecting plate and the turbine, and a second hexagon nut is installed at the lower part of the second double-ended bolt.

[0010] Furthermore, a lower support rod is installed in the middle of the valve cover, and the upper part of the lower support rod extends into the lower center of the valve body, and the lower part of the ball is rotatably connected to the upper part of the lower support rod.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model uses two O-ring seals on both the self-lubricating bearing and the inside and outside of the stuffing box, and pre-places PTFE V-shaped packing in the stuffing box to ensure the reliability and feasibility of the valve shaft sealing performance; the valve's drain device in this utility model can periodically discharge the accumulated material in the cavity, reduce the contamination of the medium inside the valve, and can conveniently check the sealing performance of the valve seat from any direction without having to remove the valve from the pipeline.

[0013] 2. In this utility model, the spring-loaded pre-tightened valve seat can automatically release the pressure in the valve cavity by compressing the spring when the medium in the valve cavity experiences an abnormal pressure increase. After the pressure is released, the valve seat automatically resets and seals, ensuring the safe operation of the system. In the event of an accidental fire or abnormal temperature rise that causes the non-metallic valve seat to soften and burn, the specially designed valve seat support metal sealing surface forms a metal-to-metal contact with the ball under the action of the spring load, which can play an instantaneous sealing role.

[0014] 3. This utility model employs an advanced spring loading and piston effect mechanism, achieving excellent sealing under low pressure differential, high pressure differential, and vacuum conditions. It boasts advantages such as a reasonable sealing structure, advanced technology, rapid and flexible opening and closing, low torque, minimal valve seat deformation, low flow resistance, stable sealing performance, long service life, safety, reliability, and convenient maintenance. Either end of the valve can be used as the upstream end, thus eliminating directional restrictions during installation.

[0015] 4. In this utility model, the valve ball is supported by a fixed shaft, which eliminates the huge sealing load formed by the upstream medium pressure pushing the ball against the downstream valve seat. At the same time, it adopts a PTFE valve seat and a valve stem self-lubricating bearing with a low coefficient of friction and good self-lubrication, and is equipped with a bypass ball valve. Therefore, even under the working conditions of the highest working pressure, the valve can be operated flexibly and freely for a long time. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model;

[0017] Figure 2This is a right-side view of an embodiment of the present utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of a sphere according to an embodiment of the present invention.

[0020] In the diagram: 1. Valve cover; 2. Valve body; 3. First double-ended bolt; 4. First hexagonal nut; 5. Metal plate; 6. Lower support rod; 7. Spring; 8. O-ring; 9. Valve seat support ring; 10. Valve seat; 11. Ball; 12. Valve stem; 13. Sliding bearing; 14. Front cover; 15. Socket head screw; 16. Packing; 17. Second double-ended bolt; 18. Second hexagonal nut; 19. Connecting disc; 20. Turbine; 21. Drain valve; 22. Through hole. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details, such as particular system structures and technologies, are provided to facilitate a more thorough understanding of the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0022] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model. Figure 2 This is a right-side view of an embodiment of the present utility model. Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present utility model and Figure 4 This is a schematic diagram of a sphere according to an embodiment of the present invention.

[0024] Reference Figures 1 to 4As shown, this utility model provides a soft-seal ball valve, including a valve body 2 and a ball 11. A drain valve 21 is provided at the bottom center of the valve body 2, and a valve cover 1 is provided at the lower end of the drain valve 21. A first double-ended bolt 3 is installed at the lower port of the valve cover 1 and the drain valve 21, and a first hexagonal nut 4 is installed at the outer end of the first double-ended bolt 3. The ball 11 is rotatably mounted in the center of the valve cover 1, and a valve stem 12 is installed at the upper center of the ball 11. The middle part of the valve stem 12 is sleeved in the front cover 14, and the upper end of the front cover 14 is fixed to the lower part of the connecting plate 19. The connecting plate 19 is installed at the lower part of the turbine 20.

[0025] In this embodiment, a metal sheet 5 is provided between the valve cover 1 and the valve body 2, and the metal sheet 5 is a detachable structure, and the valve body 2 and the valve cover 1 are detachably connected.

[0026] As a preferred embodiment, this utility model employs two O-ring seals both inside and outside the self-lubricating bearing and stuffing box, and pre-places PTFE V-shaped packing inside the stuffing box to ensure the reliability and feasibility of the valve shaft sealing performance. The valve's drain device in this utility model can periodically discharge accumulated material in the cavity, reducing contamination of the medium inside the valve, and can conveniently check the sealing performance of the valve seat from any direction without removing the valve from the pipeline.

[0027] In this embodiment, a valve seat support ring 9 is fitted inside the bottom of the valve body 2, and a valve seat 10 is provided between the inner side of the valve seat support ring 9 and the outer side of the ball 11. A spring 7 is provided on the outer side of the valve seat support ring 9, and an O-ring 8 is provided on the lower side of the valve seat support ring 9. A through hole 22 is opened in the center of the ball 11, and the centers of the turbine 20, the front cover 14, the valve stem 12 and the ball 11 are all located on the same axis. A sliding bearing 13 is provided between the upper part of the ball 11 and the lower part of the front cover 14.

[0028] As a preferred embodiment, the spring-loaded pre-tightened valve seat in this utility model can automatically release the pressure in the valve cavity by compressing the spring when the medium in the valve cavity experiences abnormal pressure rise. After pressure release, the valve seat automatically resets and seals, ensuring the safe operation of the system. In the event of an accidental fire or abnormal temperature rise that causes the non-metallic valve seat to soften and burn, the specially designed valve seat support metal sealing surface forms a metal-to-metal contact with the ball under the action of spring load, which can play an instantaneous sealing role.

[0029] In this embodiment, a packing 16 is installed between the valve stem 12, the front cover 14 and the connecting plate 19, and an internal hexagon screw 15 is installed between the upper part of the front cover 14 and the upper part of the valve body 2. A second double-ended bolt 17 is installed between the connecting plate 19 and the turbine 20, and a second hexagon nut 18 is installed at the lower part of the second double-ended bolt 17.

[0030] As a preferred embodiment, this invention employs an advanced spring loading and piston effect mechanism, achieving excellent sealing under low pressure differential, high pressure differential, and vacuum conditions. It boasts advantages such as a reasonable sealing structure, advanced technology, rapid and flexible opening and closing, low torque, minimal valve seat deformation, low flow resistance, stable sealing performance, long service life, safety and reliability, and convenient maintenance. Either end of the valve can be used as the upstream end, thus eliminating directional restrictions during installation.

[0031] In this embodiment, a lower support rod 6 is installed in the middle of the valve cover 1, and the upper part of the lower support rod 6 extends into the lower center of the valve body 2, and the lower part of the ball 11 is rotatably connected to the upper part of the lower support rod 6.

[0032] As a preferred embodiment, the valve ball in this invention is supported by a fixed shaft, eliminating the huge sealing load formed by the upstream medium pressure pushing the ball against the downstream valve seat. At the same time, it adopts a PTFE valve seat and a valve stem self-lubricating bearing with a low coefficient of friction and good self-lubrication, and is equipped with a bypass ball valve. Therefore, even under the working conditions of the highest working pressure, the valve can be operated flexibly and freely for a long time.

[0033] This invention effectively solves the problems of valve stem rotation failure or inability to open in existing ball valves, as well as potential leakage at the sealing surface, making them unsafe, unstable, and impractical. This invention employs two O-ring seals both inside and outside the self-lubricating bearing and stuffing box, and pre-places PTFE V-shaped packing inside the stuffing box to ensure the reliability and feasibility of the valve stem sealing performance. Simultaneously, it uses a PTFE valve seat and valve stem self-lubricating bearing with a low coefficient of friction and good self-lubricating properties, facilitating long-term, flexible, and smooth valve operation, and making it safer and more durable.

[0034] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A soft-seal ball valve, characterized in that: The device includes a valve body (2) and a ball (11). A drain valve (21) is provided at the bottom center of the valve body (2), and a valve cover (1) is provided at the lower end of the drain valve (21). A first double-ended bolt (3) is installed at the lower end of the valve cover (1) and the drain valve (21), and a first hexagonal nut (4) is installed at the outer end of the first double-ended bolt (3). A ball (11) is rotatably mounted in the center of the valve cover (1), and a valve stem (12) is installed in the middle of the upper part of the ball (11). The middle part of the valve stem (12) is fitted inside the front cover (14), and the upper end of the front cover (14) is fixed to the lower part of the connecting plate (19). The connecting plate (19) is installed at the lower part of the turbine (20).

2. The soft-seal ball valve according to claim 1, characterized in that, A metal sheet (5) is provided between the valve cover (1) and the valve body (2), and the metal sheet (5) is a detachable structure, and the valve body (2) and the valve cover (1) are connected separately.

3. A soft-seal ball valve according to claim 1, characterized in that, The valve body (2) has a valve seat support ring (9) fitted on its inner bottom, and a valve seat (10) is provided between the inner side of the valve seat support ring (9) and the outer side of the ball (11). A spring (7) is provided on the outer side of the valve seat support ring (9), and an O-ring (8) is provided on the lower side of the valve seat support ring (9).

4. A soft-seal ball valve according to claim 1, characterized in that, The ball (11) has a through hole (22) at its center, and the centers of the turbine (20), front cover (14), valve stem (12) and ball (11) are all located on the same axis. A sliding bearing (13) is provided between the upper part of the ball (11) and the lower part of the front cover (14).

5. A soft-seal ball valve according to claim 1, characterized in that, A packing (16) is installed between the valve stem (12), the front cover (14) and the connecting plate (19), and an internal hexagon screw (15) is installed between the upper part of the front cover (14) and the upper part of the valve body (2), and a second double-ended bolt (17) is installed between the connecting plate (19) and the turbine (20), and a second hexagon nut (18) is installed at the lower part of the second double-ended bolt (17).

6. A soft-seal ball valve according to claim 1, characterized in that, A lower support rod (6) is installed in the middle of the valve cover (1), and the upper part of the lower support rod (6) extends into the lower center of the valve body (2), and the lower part of the ball (11) is rotatably connected to the upper part of the lower support rod (6).

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