Zero-leakage ball valve
By adopting the rotating shaft, multi-layer O-ring and retaining ring design with a step shaft structure in the ball valve, combined with the adjustment of the gasket and lead seal, the contradiction between sealing and handle operating force is solved, and the effect of zero leakage and operating force balance is achieved.
Patent Information
- Application Number
- CN202422233905.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-12
AI Technical Summary
There is a contradiction between the sealing and the handle operating force of the existing ball valves. They are prone to leakage when the sealing is poor, and the handle operating force increases when the pre-pressure is high.
The shaft, multi-layer O-ring and retaining ring design with a step shaft structure is adopted, and the adjustment gasket and lead seal are combined to ensure the balance of sealing and handle operating force.
实现了零泄漏的密封性,同时避免了手柄操作力增大,提高了球阀的密封性和操作便捷性。
Smart Images
Figure CN223076300U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ball valves, and particularly relates to a zero-leakage ball valve. Background Art
[0002] Ball valves are widely used in industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal administration, and steel, and play a crucial role in the national economy. It has an operation of rotating 90 degrees, the plug body is a sphere, and there is a circular through-hole or channel passing through its axis.
[0003] However, in order to prevent leakage of existing ball valves, a sealing gasket is usually provided at the connection between the sphere and the valve body. The pre-pressure of the sealing pair formed by the sealing gasket and the sphere is the core technology of the ball valve. However, when the pre-pressure is small, low-pressure internal leakage will occur when the ball valve works; when the pre-pressure is large, the operating force of the handle will increase when the ball valve is opened and closed. At the same time, the clearance between the rotating shaft and the top cover hole of the existing ball valve is also the core technology of the ball valve. When the clearance is small, the operating force of the handle increases, and when the clearance is large, external leakage will occur at the rotating shaft and the top cover hole after a long time. Therefore, it is an urgent problem for those skilled in the art at this stage to provide a ball valve with good sealing performance and without increasing the operating force of the handle. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a zero-leakage ball valve, which not only has good sealing performance but also does not increase the operating force of the handle.
[0005] To solve the above technical problems, the technical solutions adopted by the utility model are as follows.
[0006] A zero-leakage ball valve includes a valve body; a sphere cavity is opened inside the valve body, and a sphere is rotatably arranged in the sphere cavity; a top cover is inserted into the top of the valve body, and a rotating shaft that is rotatably connected to the top cover and connected to the sphere and used to drive the sphere to rotate is arranged through the top cover. Among them, a gasket is arranged in the sphere cavity, and a sealing gasket used to form a pre-pressure of the sealing pair with the sphere is arranged on the gasket; an end cover communicated with the valve body is inserted into the right end of the valve body, and a plurality of adjusting gaskets used to adjust the pre-pressure of the sealing pair to meet the technical requirements are arranged between the radial contact surfaces of the end cover and the valve body; the rotating shaft is of a stepped shaft structure, and a stepped hole used to pass through the rotating shaft and cooperate with the stepped shaft structure on the rotating shaft is opened in the top cover.
[0007] Preferably, a first O-ring used to realize the seal between the end cover and the valve body and a first retaining ring used to prevent the axial movement of the first O-ring are arranged between the axial contact surfaces of the end cover and the valve body through a first shaft groove opened on the outer wall of the end cover.
[0008] Preferably, the top of the rotating shaft passes through the top cover and is connected with a handle for driving the rotation of the rotating shaft. The top of the rotating shaft passes through the handle and is fixedly connected with the handle through a nut that presses on the handle and is threadedly connected with the rotating shaft. A first spring washer sleeved on the rotating shaft is arranged between the nut and the handle.
[0009] Preferably, between the axial contact surfaces of the rotating shaft and the top cover, two second O-rings for sealing between the rotating shaft and the top cover and a second retaining ring for preventing the axial movement of the second O-ring are arranged through two second shaft grooves opened on the outer wall of the rotating shaft.
[0010] Preferably, between the axial contact surfaces of the top cover and the valve body, a third O-ring for sealing between the top cover and the valve body and a third retaining ring for preventing the axial movement of the third O-ring are arranged through a third shaft groove opened on the outer wall of the top cover.
[0011] Preferably, both the top cover and the end cover are fixedly connected with the valve body through socket head cap screws; second spring washers are respectively arranged between the socket head cap screws and the top cover and the end cover.
[0012] Preferably, dust covers are respectively buckled on the left end of the valve body and the right end of the end cover, and a fourth O-ring is arranged inside the dust cover.
[0013] Preferably, two positioning pins for limiting the rotation angle of the handle are erected on the top cover, and two matching grooves for corresponding cooperation with the two positioning pins are opened on the handle.
[0014] Preferably, a lead seal for preventing unauthorized opening of the ball valve is arranged between the top cover and the end cover.
[0015] Due to the adoption of the above technical solutions, the technical progress obtained by the present utility model is as follows.
[0016] The whole of the present utility model can achieve zero leakage. Through the arranged adjusting gaskets, the pre-pressure of the sealing pair formed by the sealing washer and the sphere can meet the technical requirements, so that not only can it be ensured that no low-pressure internal leakage occurs during the operation of the ball valve, but also the operating force of the handle will not increase; through the arranged rotating shaft with a stepped shaft structure, the stepped hole opened in the top cover, and the two second O-rings and the second retaining ring, not only can it prevent external leakage from occurring at the rotating shaft and the stepped hole for a long time, but also the operating force of the handle will not increase; through the arranged first O-ring, the first retaining ring, the third O-ring and the third retaining ring, external leakage between the valve body and the end cover and the top cover can be avoided. Description of the Drawings
[0017] Figure 1 is a cross-sectional view of the present utility model;
[0018] Figure 2 is a top view of the present utility model;
[0019] Figure 3 This is the side view of the utility model.
[0020] Wherein: 1. Valve body, 2. Rotating shaft, 3. End cover, 4. Adjusting gasket, 5. Dust cover, 6. Sealing gasket, 7. Top cover, 8. Handle, 9. Gasket, 10. Sphere, 11. First retaining ring, 12. First O-ring, 13. Nut, 14. First spring washer, 15. Second retaining ring, 16. Second O-ring, 17. Third retaining ring, 18. Third O-ring, 19. Hexagon socket head cap screw, 20. Fourth O-ring, 21. Positioning pin, 22. Second spring washer, 23. Sealing lead, 24. Rivet, 25. Nameplate. Specific embodiments
[0021] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] A zero-leakage ball valve, in combination with Figures 1 to 3 As shown, it includes a valve body 1. A sphere cavity is provided inside the valve body 1, and a sphere 10 is rotatably arranged in the sphere cavity; a top cover 7 is inserted into the top of the valve body 1, a rotating shaft 2 is passed through the top cover 7, the rotating shaft 2 is rotatably connected to the top cover 7 and connected to the sphere 10, and the rotating shaft 2 is used to drive the sphere 10 to rotate, so as to realize the opening and closing of the ball valve.
[0023] The rotating shaft 2 has a stepped shaft structure. The top of the rotating shaft 2 passes through the top cover 7 and is connected with a handle 8. At the same time, the top of the rotating shaft 2 passes through the handle 8, and the top end of the rotating shaft 2 is threadedly connected with a nut 13. The nut 13 presses on the handle 8, and thus cooperates with the stepped shaft structure on the rotating shaft 2 to fix the handle 8 on the rotating shaft 2. When holding the handle 8 to drive the rotating shaft 2 to rotate, the rotating shaft 2 can drive the sphere 10 to rotate. A first spring washer 14 is arranged between the nut 13 and the handle 8. The first spring washer 14 is sleeved on the rotating shaft 2, and the first spring washer 14 is used to prevent the nut 13 from damaging the handle 8 and improve the connection strength and sealing performance between the handle 8 and the rotating shaft 2.
[0024] Two positioning pins 21 are erected on the top cover 7. The two positioning pins 21 are arranged at 90 degrees with the rotation axis of the rotating shaft 2 as the center; two fitting grooves are provided on the handle 8. When the handle 8 rotates clockwise to be in the Figures 1 to 3 position shown, the ball valve is fully open. One fitting groove on the handle 8 cooperates with one positioning pin 21 to limit the maximum clockwise rotation angle of the handle 8; when the handle 8 rotates counterclockwise 90° in the Figures 1 to 3 position shown, the ball valve is fully closed. The other fitting groove on the handle 8 cooperates with the other positioning pin 21 to limit the maximum counterclockwise rotation angle of the handle 8.
[0025] A stepped hole is provided in the top cover 7. The stepped hole is used to pass through the rotating shaft 2 and cooperate with the stepped shaft structure on the rotating shaft 2, which not only facilitates the rotation of the rotating shaft 2 in the top cover 7 and does not increase the operating force of the handle 8, but also facilitates the sealing between the rotating shaft 2 and the top cover 7. Two second shaft grooves are provided between the axial contact surfaces of the rotating shaft 2 and the top cover 7. Both of the two second shaft grooves are provided on the outer wall of the rotating shaft 2. A second retaining ring 15 and a second O-ring 16 are respectively arranged in the two second shaft grooves. Among them, the second O-ring 16 is used to achieve the sealing between the rotating shaft 2 and the top cover 7, thereby further avoiding the occurrence of external leakage between the rotating shaft 2 and the stepped hole over a long time; the second retaining ring 15 is used to prevent the axial movement of the second O-ring 16.
[0026] A third shaft groove is provided between the axial contact surfaces of the top cover 7 and the valve body 1. The third shaft groove is provided on the outer wall of the top cover 7. A third retaining ring 17 and a third O-ring 18 are arranged in the third shaft groove. Among them, the third O-ring 18 is used to achieve the sealing between the top cover 7 and the valve body 1; the third retaining ring 17 is used to prevent the axial movement of the third O-ring 18.
[0027] A washer 9 is arranged in the sphere cavity. A sealing washer 6 is arranged on the washer 9. The sealing washer 6 is made of nylon 1010. The sealing washer 6 is used to form a sealing pair pre-pressure with the sphere 10, thereby ensuring the sealing between the sphere 10 and the valve body 1. An end cover 3 is inserted into the right end of the valve body 1. The end cover 3 is communicated with the valve body 1. A plurality of adjusting washers 4 are arranged between the radial contact surfaces of the end cover 3 and the valve body 1. By adjusting the number of the adjusting washers 4, the sealing pair pre-pressure formed by the sealing washer 6 and the sphere 10 can meet the technical requirements.
[0028] A first shaft groove is provided between the axial contact surfaces of the end cover 3 and the valve body 1. The first shaft groove is provided on the outer wall of the end cover 3. A first retaining ring 11 and a first O-ring 12 are arranged in the first shaft groove. Among them, the first O-ring 12 is used to achieve the sealing between the end cover 3 and the valve body 1; the first retaining ring 11 is used to prevent the axial movement of the first O-ring 12.
[0029] Both the end cover 3 and the top cover 7 are fixedly connected to the valve body 1 through hexagon socket head cap screws 19. Second spring washers 22 are respectively arranged between the hexagon socket head cap screws 19 and the top cover 7 and the end cover 3, thereby preventing the hexagon socket head cap screws 19 from damaging the end cover 3 and the top cover 7 and improving the connection strength and sealing performance between the end cover 3 and the top cover 7 and the valve body 1.
[0030] A lead seal 23 is arranged between the end cover 3 and the top cover 7. The lead seal 23 is used to prevent someone from privately opening the ball valve and ensure the original sealed state of the ball valve.
[0031] Dust covers 5 are respectively buckled on the left end of the valve body 1 and the right end of the end cover 3. A fourth O-ring 20 is arranged inside the dust cover 5, thereby playing a role in dust prevention.
[0032] The outer side of the valve body 1 is provided with a nameplate 25 through rivets 24, and the nameplate 25 is used for indication purposes.
[0033] When the utility model is in use, through the arranged adjusting gasket 4, the pre-pressure of the sealing pair formed by the sealing gasket 6 and the sphere 10 can meet the technical requirements, so that not only can it ensure that there is no low-pressure internal leakage during the operation of the ball valve, but also it will not cause an increase in the operating force of the handle 8; through the arranged rotating shaft 2 with a stepped shaft structure, the stepped hole opened in the top cover 7, and the two second O-rings 16 and the second retaining ring 15, it can not only prevent external leakage from occurring at the rotating shaft 2 and the stepped hole for a long time, but also will not cause an increase in the operating force of the handle 8; through the arranged first O-ring 12, the first retaining ring 11, the third O-ring 18 and the third retaining ring 17, external leakage between the valve body 1 and the end cover 3 and the top cover 7 can be avoided.
Claims
1. A zero-leakage ball valve, comprising a valve body (1); a spherical cavity is formed inside the valve body (1), and a ball (10) is rotatably arranged in the spherical cavity; a top cover (7) is inserted into the top of the valve body (1), and a rotating shaft (2) which is rotatably connected to the top cover (7) and connected to the ball (10) and used to drive the ball (10) to rotate penetrates through the top cover (7), and it is characterized in that: A washer (9) is arranged in the spherical cavity, and a sealing washer (6) for forming a pre-pressure of the sealing pair with the sphere (10) is arranged on the washer (9); a end cover (3) communicated with the valve body (1) is inserted at the right end of the valve body (1), and a plurality of adjusting gaskets (4) for adjusting the pre-pressure of the sealing pair to meet the technical requirements are arranged between the radial contact surfaces of the end cover (3) and the valve body (1); the rotating shaft (2) is of a stepped shaft structure, and a stepped hole for passing through the rotating shaft (2) and matching with the stepped shaft structure on the rotating shaft (2) is arranged in the top cover (7).
2. The zero-leakage ball valve according to claim 1, characterized in that: A first O-ring (12) for realizing the seal between the end cover (3) and the valve body (1) and a first retaining ring (11) for preventing the axial movement of the first O-ring (12) are arranged between the axial contact surfaces of the end cover (3) and the valve body (1) through a first shaft groove opened on the outer wall of the end cover (3).
3. A zero-leakage ball valve according to claim 1, characterized in that: The top of the rotating shaft (2) passes through the top cover (7) and is connected with a handle (8) for driving the rotating shaft (2) to rotate. Moreover, the top of the rotating shaft (2) passes through the handle (8) and is fixedly connected with the handle (8) through a nut (13) pressed on the handle (8) and threadedly connected with the rotating shaft (2). A first spring washer (14) sleeved on the rotating shaft (2) is arranged between the nut (13) and the handle (8).
4. The zero-leakage ball valve according to claim 1, wherein: Two second O-rings (16) for realizing the seal between the rotating shaft (2) and the top cover (7) and a second retaining ring (15) for preventing the axial movement of the second O-ring (16) are arranged between the axial contact surfaces of the rotating shaft (2) and the top cover (7) through two second shaft grooves opened on the outer wall of the rotating shaft (2).
5. A zero-leakage ball valve according to claim 1, characterized in that: A third O-ring (18) for realizing the seal between the top cover (7) and the valve body (1) and a third retaining ring (17) for preventing the axial movement of the third O-ring (18) are arranged between the axial contact surfaces of the top cover (7) and the valve body (1) through a third shaft groove opened on the outer wall of the top cover (7).
6. The zero-leakage ball valve according to claim 1, characterized in that: Both the top cover (7) and the end cover (3) are fixedly connected with the valve body (1) through hexagon socket head cap screws (19); second spring washers (22) are respectively arranged between the hexagon socket head cap screws (19) and the top cover (7) and the end cover (3).
7. A zero-leakage ball valve according to claim 1, characterized in that: Dust covers (5) are respectively buckled at the left end of the valve body (1) and the right end of the end cover (3), and a fourth O-ring (20) is arranged inside the dust cover (5).
8. A zero-leakage ball valve according to claim 1, characterized in that: Two positioning pins (21) for limiting the rotation angle of the handle (8) are erected on the top cover (7), and two matching grooves for respectively and correspondingly matching with the two positioning pins (21) are opened on the handle (8).
9. The zero-leakage ball valve according to claim 1, characterized in that: A lead seal (23) for preventing the ball valve from being privately opened is arranged between the top cover (7) and the end cover (3).