Hard sealing ball valve
By installing a flow hole and a diversion valve on the valve cover of the hard sealed ball valve, the ball valve can be opened or closed with only one diversion valve, which solves the problems of complex operation and wear and leakage of existing hard sealed ball valves. Improves work efficiency and service life.
Patent Information
- Application Number
- CN202421095300.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The existing hard seal ball valve has a large torque when opened, which can easily cause wear and leakage between the valve seat and the valve ball, complex operation, affecting the working reliability and service life.
A hard sealed ball valve is designed. By providing a flow guide hole and a flow guide valve on the valve cover, the ball valve can be opened and closed only by operating one flow guide valve, simplifying the operation steps.
By simplifying the operating steps, the working efficiency of the ball valve is improved, the wear of the valve seat and the valve ball is reduced, the service life is extended, and the working reliability of the ball valve is improved.
Smart Images
Figure CN222502765U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to a hard-sealed ball valve. Background Art
[0002] At present, ball valves have been widely used in petroleum, chemical, electric power, metallurgy, papermaking and other industries. Traditional ball valves generally use soft seals. Due to the restrictions of sealing materials, their applicable temperature range is small, their resistance to high temperature, high pressure and corrosion is low, and their service life is short. They cannot meet special working conditions that require high-parameter and high-performance ball valves as opening and closing parts, such as slurry, ash, dust and other occasions, so hard-sealed ball valves are used.
[0003] The existing hard-sealed ball valve is usually composed of a valve body, a valve cover, a valve ball, a valve seat and a valve stem. When in use, the valve stem is rotated to drive the valve ball at its lower end to rotate, so that the through hole on the valve ball corresponds to or staggers with the flow channel hole of the valve, thereby realizing the opening or closing of the ball valve. Due to the influence of the medium pressure in the valve body, the valve stem torque is large when the ball valve is opened, making it difficult to open the ball valve. The force between the valve seat and the valve ball is large when the ball valve is opened, which easily causes the wear of the valve seat and the valve ball and causes leakage, reducing the working reliability of the ball valve and shortening the service life of the ball valve.
[0004] The prior art adopts a method of setting a left valve seat cavity outer flow guide port at the flow passage of the left valve seat near the left valve cover, setting a left valve seat cavity inner flow guide port at the left valve seat cavity near the middle cavity of the valve body, and the left valve seat cavity outer flow guide port and the left valve seat cavity inner flow guide port are connected through the left valve seat cavity flow guide hole, and a left flow guide valve is provided on the pipeline of the left valve seat cavity flow guide hole to open and close the left valve seat cavity inside the left valve seat sealing ring and the left valve seat cavity outside the left valve seat sealing ring; and the right valve seat cavity inside the right valve seat sealing ring and the right valve seat cavity outside the right valve seat sealing ring are opened and closed in the same way; when the ball valve needs to be opened, the left flow guide valve and the right flow guide valve are opened to make the medium pressure in the left valve seat cavity outside the left valve seat sealing ring less than the medium pressure in the upstream pipeline on the left side of the ball valve, so that the medium is squeezed between the left valve seat and the valve ball, and between the right valve seat and the valve ball, thereby reducing the torque when opening the valve stem. However, when opening and closing the ball valve, the left and right flow guide valves need to be opened / closed, and the operation is relatively complicated.
[0005] Therefore, the utility model provides a hard-sealed ball valve, so that the ball valve can be opened / closed by only opening / closing one guide valve, so as to simplify the operation steps and improve the work efficiency. Utility Model Content
[0006] The utility model aims to provide a hard-sealed ball valve in view of the defects and shortcomings in the prior art. The ball valve can be opened / closed by operating only one guide valve, thereby simplifying the operation steps and improving the work efficiency.
[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0008] The utility model provides a valve body, a left valve cover, a right valve cover, a valve ball, a left valve seat, a right valve seat and an upper valve stem, wherein the left valve cover and the right valve cover with flow channel holes inside are respectively arranged at the left and right ends of the valve body, and the valve ball with a through hole inside is arranged in the middle cavity of the valve body, the left valve seat is arranged between the left valve cover and the valve ball, a left valve seat cavity is formed between the left valve seat and the left valve cover, the right valve seat is arranged between the right valve cover and the valve ball, a right valve seat cavity is formed between the right valve seat and the right valve cover, a left valve seat spring is installed in the left valve seat cavity, and a right valve seat spring is installed in the right valve seat cavity, a left outer throttling channel is arranged on the outside of the left valve seat, the left valve seat cavity is connected with the flow channel hole of the left valve cover through the left outer throttling channel, a right outer throttling channel is arranged on the outside of the right valve seat, and the right valve seat cavity is connected with the flow channel hole of the right valve cover through the right outer throttling channel;
[0009] A group of valve seat cavity guide holes is provided on at least the upstream valve cover, and the valve seat cavity guide holes include a first guide hole and a second guide hole that are connected to each other, one end of the first guide hole is connected to the valve seat cavity located upstream, and the second guide hole is connected to the flow channel hole located downstream, and a guide valve is provided at the first guide hole or the second guide hole or at the connection between the first guide hole and the second guide hole to connect the valve seat cavity located upstream and the flow channel hole located downstream or disconnect the connection between the valve seat cavity located upstream and the flow channel hole located downstream.
[0010] Preferably, the second flow guide hole is located outside the valve body, and the second flow guide hole is directly connected to the flow channel hole located downstream.
[0011] Preferably, the left valve cover is provided with a left valve seat chamber guide hole, the left valve seat chamber guide hole includes a first left guide hole and a second left guide hole, the first left guide hole is communicated with the left valve seat chamber, the right valve cover is provided with a right valve seat chamber guide hole, the right valve seat chamber guide hole includes a first right guide hole and a second right guide hole, the first right guide hole is communicated with the right valve seat chamber, the second left guide hole and the second right guide hole are located outside the valve body, and the second right guide hole is connected to or disconnected from the second left guide hole through a guide valve.
[0012] Preferably, the second flow guide hole is located inside the valve body, and the second flow guide hole is communicated with the flow channel hole located downstream through the middle cavity of the valve body.
[0013] Preferably, the left valve cover is provided with a left valve seat cavity guide hole, the left valve seat cavity guide hole includes a first left guide hole and a second left guide hole, the first left guide hole is connected with the left valve seat cavity, the second left guide hole is connected with the middle cavity of the valve body, and a left guide valve is provided on the first left guide hole or the second left guide hole or at the connection between the first left guide hole and the second left guide hole;
[0014] The right valve cover is provided with a right valve seat cavity guide hole, and the right valve seat cavity guide hole includes a first right guide hole and a second right guide hole, the first right guide hole is connected with the right valve seat cavity, the second right guide hole is connected with the middle cavity of the valve body, and a right guide valve is provided on the first right guide hole or the second right guide hole or at the connecting part of the first right guide hole and the second right guide hole.
[0015] Preferably, a left sealing ring is further provided between the left valve seat and the left valve cover, and the first left guide hole and the left outer throttling channel are located on the left side of the left sealing ring; a right sealing ring is further provided between the right valve seat and the right valve cover, and the first right guide hole and the right outer throttling channel are located on the right side of the right sealing ring.
[0016] Preferably, it also includes a lower valve stem, which is rotatably connected to the lower end of the valve ball.
[0017] The utility model also provides a hard-sealed ball valve, comprising a valve body, a left valve cover, a right valve cover, a valve ball, a left valve seat, a right valve seat and an upper valve stem, wherein the left valve cover and the right valve cover with flow channel holes inside are respectively disposed at the left and right ends of the valve body, and the valve ball with a through hole inside is disposed in the middle cavity of the valve body, the left valve seat is disposed between the left valve cover and the valve ball, a left valve seat cavity is formed between the left valve seat and the left valve cover, the right valve seat is disposed between the right valve cover and the valve ball, a right valve seat cavity is formed between the right valve seat and the right valve cover, a left valve seat spring is installed in the left valve seat cavity, and a right valve seat spring is installed in the right valve seat cavity;
[0018] The valve seat located upstream is not sealed with the valve ball, and at least the valve seat located downstream is provided with a valve seat cavity guide hole, the valve seat cavity guide hole includes a first guide hole and a second guide hole, one end of the first guide hole is connected to the flow channel hole located downstream, and the other end of the first guide hole is connected to the second guide hole, the valve seat cavity located downstream includes a valve seat inner cavity and a valve seat outer cavity, a valve seat spring is provided in the valve seat outer cavity, the valve seat inner cavity is connected to the second guide hole, and the inner side of the valve seat located downstream is provided with An internal throttling channel, the valve seat inner cavity is connected with the middle cavity of the valve body through the internal throttling channel, the area of the wall perpendicular to the axis of the flow channel hole in the downstream valve seat inner cavity is larger than the area of the wall in contact with the middle cavity of the valve body and the downstream valve seat, and the first guide hole or the second guide hole or the connecting part of the first guide hole and the second guide hole is provided with a guide valve to connect the downstream valve seat inner cavity and the downstream flow channel hole or disconnect the connection between the downstream valve seat inner cavity and the downstream flow channel hole.
[0019] Preferably, the left valve seat and the valve ball are not sealed, a right valve seat cavity guide hole is provided on the right valve seat, the right valve seat cavity guide hole includes a first right guide hole and a second right guide hole, the first right guide hole is connected with the flow channel hole of the right valve cover, the right valve seat cavity includes a right valve seat inner cavity and a right valve seat outer cavity, a right valve seat spring is disposed in the right valve seat outer cavity, the right valve seat inner cavity is connected with the second right guide hole, a right inner throttling channel is provided on the inner side of the right valve seat, the right valve seat inner cavity is connected with the middle cavity of the valve body through the right inner throttling channel, and a right guide valve is provided at the first right guide hole or the second right guide hole or at the connection between the first right guide hole and the second right guide hole;
[0020] The right valve seat is not sealed with the valve ball, a left valve seat is provided with a left valve seat chamber guide hole, the left valve seat chamber guide hole includes a first left guide hole and a second left guide hole, the first left guide hole is communicated with the flow channel hole of the left valve cover, the left valve seat chamber includes a left valve seat inner chamber and a left valve seat outer chamber, a left valve seat spring is disposed in the left valve seat outer chamber, the left valve seat inner chamber is communicated with the second left guide hole, a left inner throttling channel is provided on the inner side of the left valve seat, the left valve seat inner chamber is communicated with the middle chamber of the valve body through the left inner throttling channel, and a left guide valve is provided at the first left guide hole or the second left guide hole or at the connection between the first left guide hole and the second left guide hole.
[0021] Preferably, a left sealing ring is further provided between the left valve seat and the left valve cover, and the second left guide hole and the left inner throttling channel are located on the right side of the left sealing ring; a right sealing ring is further provided between the right valve seat and the right valve cover, and the second right guide hole and the right inner throttling channel are located on the left side of the right sealing ring.
[0022] Preferably, it also includes a lower valve stem, which is rotatably connected to the lower end of the valve ball.
[0023] Compared with the prior art, the utility model has achieved the following technical effects:
[0024] 1. The utility model provides a group of valve seat cavity guide holes on at least the upstream valve cover, the valve seat cavity guide holes include a first guide hole and a second guide hole which are connected to each other, one end of the first guide hole is connected to the valve seat cavity located upstream, and the second guide hole is connected to the flow channel hole located downstream, and a guide valve is provided at the first guide hole or the second guide hole or at the connection between the first guide hole and the second guide hole, so as to connect the valve seat cavity located upstream and the flow channel hole located downstream or disconnect the connection between the valve seat cavity located upstream and the flow channel hole located downstream, so as to realize the opening / closing of the ball valve by operating one guide valve, thereby simplifying the operation steps and improving the work efficiency.
[0025] Compared with the prior art, other technical solutions of the utility model have achieved the following technical effects:
[0026] 2. The utility model does not seal the valve seat and the valve ball at the upstream, and at least the valve seat at the downstream is provided with a valve seat cavity guide hole, the valve seat cavity guide hole includes a first guide hole and a second guide hole, one end of the first guide hole is connected to the flow channel hole at the downstream, and the other end of the first guide hole is connected to the second guide hole, the valve seat cavity at the downstream includes a valve seat inner cavity and a valve seat outer cavity, the valve seat spring is arranged in the valve seat outer cavity, the valve seat inner cavity is connected to the second guide hole, and an inner throttling channel is provided on the inner side of the valve seat at the downstream, and the valve seat inner cavity is connected to the second guide hole through the inner throttling channel. The middle cavities of the valve bodies are connected, the area of the wall surface perpendicular to the axis of the flow channel hole in the inner cavity of the valve seat located downstream is larger than the area of the wall surface in contact between the middle cavity of the valve body and the valve seat located downstream, and a guide valve is provided at the connection part between the first guide hole or the second guide hole or the first guide hole and the second guide hole, so as to connect the inner cavity of the valve seat located downstream and the flow channel hole downstream or disconnect the connection between the inner cavity of the valve seat located downstream and the flow channel hole downstream, and the ball valve can be opened / closed by operating a guide valve, thereby simplifying the operation steps and improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0028] Figure 1 It is a structural schematic diagram of embodiment 1;
[0029] Figure 2 It is a schematic diagram of the enlarged structure at A;
[0030] Figure 3 It is a structural schematic diagram of the second embodiment;
[0031] Figure 4 It is a schematic diagram of the enlarged structure at B;
[0032] Figure 5 This is a schematic diagram of the structure of Embodiment 3;
[0033] Figure 6 This is a schematic diagram of the enlarged structure at C.
[0034] Among them, in embodiment 1: 1. valve body; 2. left valve cover; 3. right valve cover; 4. valve ball; 5. left valve seat; 6. right valve seat; 7. upper valve stem; 8. left flow channel hole; 9. right flow channel hole; 10. left valve seat cavity; 11. right valve seat cavity; 12. left valve seat spring; 13. right valve seat spring; 14. left outer throttling channel; 15. right outer throttling channel; 16. first left guide hole; 17. second left guide hole; 18. first right guide hole; 19. second right guide hole; 20. guide valve; 23. left sealing ring; 24. right sealing ring; 25. lower valve stem; 32. middle cavity.
[0035] In the second embodiment: 1. valve body; 2. left valve cover; 3. right valve cover; 4. valve ball; 5. left valve seat; 6. right valve seat; 7. upper valve stem; 8. left flow channel hole; 9. right flow channel hole; 10. left valve seat cavity; 11. right valve seat cavity; 12. left valve seat spring; 13. right valve seat spring; 14. left outer throttling channel; 15. right outer throttling channel; 16. first left guide hole; 17. second left guide hole; 18. first right guide hole; 19. second right guide hole; 21. left guide valve; 22. right guide valve; 23. left sealing ring; 24. right sealing ring; 25. lower valve stem; 32. middle cavity.
[0036] In the third embodiment: 1. valve body; 2. left valve cover; 3. right valve cover; 4. valve ball; 5. left valve seat; 6. right valve seat; 7. upper valve stem; 8. left flow channel hole; 9. right flow channel hole; 10. left valve seat cavity; 11. right valve seat cavity; 12. left valve seat spring; 13. right valve seat spring; 16. first left guide hole; 17. second left guide hole; 18. first right guide hole; 19. second right guide hole; 21. left guide valve; 22. right guide valve; 23. left sealing ring; 24. right sealing ring; 25. lower valve stem; 26. right valve seat inner cavity; 27. right valve seat outer cavity; 28. right inner throttling channel; 29. left valve seat inner cavity; 30. left valve seat outer cavity; 31. left inner throttling channel; 32. middle cavity; 33. gap. DETAILED DESCRIPTION
[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0039] like Figures 1 to 4 As shown, the utility model provides a hard-sealed ball valve, including a valve body 1, a left valve cover 2, a right valve cover 3, a valve ball 4, a left valve seat 5, a right valve seat 6 and an upper valve stem 7. The left valve cover 2 is provided with a left flow channel hole 8, the right valve cover 3 is provided with a right flow channel hole 9, the left valve cover 2 and the right valve cover 3 are respectively arranged at the left and right ends of the valve body 1, the valve ball 4 with a through hole inside is arranged in the middle cavity 32 of the valve body 1, a left valve seat 5 is arranged between the left valve cover 2 and the valve ball 4, a left valve seat cavity 10 is formed between the left valve seat 5 and the left valve cover 2, and the right valve cover 3 and the valve A right valve seat 6 is provided between the balls 4, a right valve seat cavity 11 is formed between the right valve seat 6 and the right valve cover 3, a left valve seat spring 12 is installed in the left valve seat cavity 10, a right valve seat spring 13 is installed in the right valve seat cavity 11, a left outer throttling channel 14 is provided on the outside of the left valve seat 5, the left valve seat cavity 10 is connected with the left flow channel hole 8 through the left outer throttling channel 14, a right outer throttling channel 15 is provided on the outside of the right valve seat 6, the right valve seat cavity 11 is connected with the right flow channel hole 9 through the right outer throttling channel 15, wherein the outer side refers to the side of the valve seat away from the valve ball 4;
[0040] At least one valve cover located upstream is provided with a group of valve seat cavity guide holes, the valve seat cavity guide holes include a first guide hole and a second guide hole that are connected, one end of the first guide hole is connected to the valve seat cavity located upstream, and the second guide hole is connected to a flow channel hole for accommodating a downstream medium, and a guide valve is provided at the first guide hole or the second guide hole or at the connection between the first guide hole and the second guide hole to connect the valve seat cavity located upstream and the flow channel hole located downstream or disconnect the connection between the valve seat cavity located upstream and the flow channel hole located downstream.
[0041] When the pressurized medium is introduced from the left side, the left side is the upstream and the right side is the downstream; when the pressurized medium is introduced from the right side, the right side is the upstream and the left side is the downstream.
[0042] Only one group of guide holes in the valve seat cavity can be provided, or two or more groups can be provided. A short pipe connection can be provided between the guide holes in the valve seat cavity and the guide valve. The guide valve is a left and right separate structure, or is one of a valve group structure, a multi-way valve structure, an integral structure, and an upper valve stem transmission structure.
[0043] The second flow guide hole can be directly connected to the flow channel hole located downstream, and the second flow guide hole can also be connected to the flow channel hole located downstream through the middle cavity 32 of the valve body 1. In order to explain the connection between the second flow guide hole and the flow channel hole located downstream in more detail, different embodiments are discussed in detail below.
[0044] Embodiment 1:
[0045] See also Figure 1 , Figure 2 The second flow guide hole is located outside the valve body, and the second flow guide hole is directly connected to the flow channel hole located downstream without passing through the middle cavity 32 of the valve body 1.
[0046] Specifically, taking the left side as the upstream as an example, the guide hole on the left valve cover 2 is called the left valve seat cavity guide hole, and the left valve seat cavity guide hole includes a first left guide hole 16 and a second left guide hole 17. One end of the first left guide hole 16 is connected to the left valve seat cavity 10, and the other end of the first left guide hole 16 is connected to the second left guide hole 17. The second left guide hole 17 is located outside the valve body, and the other end of the second left guide hole 17 passes through the shell of the right valve cover 3 and is connected to the right flow channel hole 9. The second left guide hole 17 can be connected with the right valve seat cavity 11, and thus connected with the right flow channel hole 9 through the right valve seat cavity 11 and the right outer throttling channel 15, or it can directly pass through the shell of the right valve cover 3 and be connected with the right flow channel hole 9 without passing through the right valve seat cavity 11; when the second left guide hole 17 directly passes through the shell of the right valve cover 3 and is connected with the right flow channel hole 9, pressurized medium can only be introduced from one side, and the application scope of the hard-sealed ball valve is limited. For this reason, the present application preferably arranges the second left guide hole 17 to be connected with the right valve seat cavity 11, so that the upstream medium can flow in from both the left and the right, thereby broadening the application scope of the hard-sealed ball valve.
[0047] For the convenience of description, the guide hole located on the right valve cover is called the right valve seat cavity guide hole. The right valve seat cavity guide hole includes a first right guide hole 18 and a second right guide hole 19. The first right guide hole 18 is connected to the right valve seat cavity 11. The second left guide hole 17 and the second right guide hole 19 are located outside the valve body 1, and the second right guide hole 19 is connected to or disconnected from the second left guide hole 17 through a guide valve 20. The guide valve 20 can be set on the second right guide hole 19, or on the second left guide hole 17, or at the connection between the second right guide hole 19 and the second left guide hole 17. In this embodiment, the guide valve 20 is preferably set at the connection between the second right guide hole 19 and the second left guide hole 17.
[0048] The working principle of this embodiment is explained by taking the introduction of upstream pressurized medium into the left flow channel hole 8 as an example. When the ball valve and the guide valve 20 are in the closed state, the medium enters the left valve seat cavity 10 through the left outer throttling channel 14. The left valve seat 5 moves to the right to fit the valve ball 4 under the push of the medium pressure in the left valve seat cavity 10, so that the left valve seat 5 is sealed with the valve ball 4. At this time, the right valve seat 6 is not sealed with the valve ball 4. During the closing process of the ball valve, a part of the medium will remain in the middle cavity 32 of the valve body 1. Because the right valve seat cavity 11 is connected with the right flow channel hole 9, the medium remaining in the middle cavity 32 of the valve body 1 will push the right valve seat 6 to move to the right and separate from the valve ball 4, so that the residual medium is discharged from the narrow gap formed between the right valve seat 6 and the valve ball 4 into the right flow channel hole 9 and enter the downstream pipeline, so that no medium residue is generated in the middle cavity 32 of the valve body 1; the working principle when the medium flows in from the right flow channel hole 9 is similar to this, and it will not be repeated here. The valve of this embodiment is a structural form in which the upstream valve seat is sealed and the downstream valve seat is not sealed.
[0049] When the ball valve is opened, the guide valve 20 is opened, and the pressurized medium enters the right flow channel hole 9 through the left valve seat cavity 10, the first left guide hole 16, the second left guide hole 17, the second right guide hole 19, the first right guide hole 18, and the right valve seat cavity 11, so that the medium pressure in the left valve seat cavity 10 is less than the medium pressure in the left flow channel hole 8. The left valve seat 5 moves to the left side and separates from the valve ball 4 under the push of the medium pressure in the left flow channel hole, so that the pressurized medium enters the middle cavity 32 of the valve body 1. Since the right valve seat cavity 11 is connected with the right flow channel hole 9, the pressurized medium in the middle cavity 32 of the valve body 1 can push open the right valve seat 6. At this time, the upper valve stem 7 is rotated to drive the valve ball 4 to rotate 90 degrees, so that the through hole on the valve ball 4 is connected with the flow channel hole of the ball valve, and the ball valve is opened; the working principle when the medium flows in from the right flow channel hole 9 is similar to this, which will not be repeated here.
[0050] When closing the ball valve, the upper valve stem 7 is rotated in the opposite direction to drive the valve ball 4 to rotate 90 degrees, so that the through hole on the valve ball 4 is offset from the flow channel hole of the ball valve to close the ball valve, and then the guide valve 20 is closed, so that the pressurized medium entering the left valve seat cavity and the left valve seat spring 12 push the left valve seat 5 together, so that the left valve seat 5 and the valve ball 4 fit more closely to achieve sealing. The working principle when the medium flows in from the right flow channel hole 9 is similar to this, and it will not be repeated here. For the contents not mentioned in this embodiment, please refer to the previous general description.
[0051] Embodiment 2:
[0052] See also Figure 3 , Figure 4 The second flow guide hole is located inside the valve body 1 , and the second flow guide hole is connected with the flow channel hole located downstream through the middle cavity 32 of the valve body 1 .
[0053] If only one set of valve seat cavity guide holes is provided on the valve cover connected to the upstream medium, the pressurized medium can only be introduced from one side, which limits the use of the sealed ball valve. For this reason, the present embodiment preferably provides valve seat cavity guide holes on both the left valve cover 2 and the right valve cover 3, so that the medium can flow in from both the left flow channel hole and the right flow channel hole, thereby improving the application range of the ball valve.
[0054] Specifically, the left valve cover 2 is provided with a left valve seat cavity guide hole, and the left valve seat cavity guide hole includes a first left guide hole 16 and a second left guide hole 17. The first left guide hole 16 is connected to the left valve seat cavity 10, and the second left guide hole 17 is connected to the middle cavity 32 of the valve body 1. A left guide valve 21 is provided on the first left guide hole 16 or the second left guide hole 17 or at the connection between the first left guide hole 16 and the second left guide hole 17.
[0055] The right valve cover 3 is provided with a right valve seat cavity guide hole, and the right valve seat cavity guide hole includes a first right guide hole 18 and a second right guide hole 19. The first right guide hole 18 is connected with the right valve seat cavity 11, and the second right guide hole 19 is connected with the middle cavity 32 of the valve body 1. A right guide valve 22 is provided on the first right guide hole 18 or the second right guide hole 19 or at the connecting portion between the first right guide hole 18 and the second right guide hole 19.
[0056] Taking the introduction of upstream pressurized medium into the left flow channel hole 8 as an example, the working principle of this embodiment is explained. When the ball valve and the left guide valve 21 are in the closed state, the medium enters the left valve seat cavity 10 through the left outer throttling channel 14. The left valve seat 5 is pushed by the medium pressure in the left valve seat cavity 10 to move rightward to fit the valve ball 4, so that the left valve seat 5 and the valve ball 4 are sealed. At this time, the right valve seat 6 and the valve ball 4 are not sealed. During the closing process of the ball valve, a part of the medium will remain in the middle cavity 32 of the valve body 1. Because the right valve seat cavity 11 is connected to the right flow channel hole 9, the medium pressure in the right valve seat cavity 11 is less than that of the valve body 1. The medium pressure in the middle cavity 32 of the valve body 1 is increased, so the medium remaining in the middle cavity 32 of the valve body 1 will push the right valve seat 6 to move rightward and separate from the valve ball 4, so that the residual medium is discharged from the narrow gap formed between the right valve seat 6 and the valve ball 4 into the right flow channel hole 9 and enters the downstream pipeline, so that no medium residue is generated in the middle cavity 32 of the valve body 1; the working principle when the medium flows in from the right flow channel hole 9 is similar to this, and it will not be repeated here. The valve of this embodiment also has a structural form in which the upstream valve seat is sealed and the downstream valve seat is not sealed.
[0057] When the ball valve is opened, the left guide valve 21 is opened, and the pressurized medium enters the middle cavity 32 of the valve body 1 through the left valve seat cavity 10, the first left guide hole 16, and the second left guide hole 17. Since the right valve seat cavity 11 is connected to the right flow channel hole 9, the medium pressure in the right valve seat cavity 11 is less than the medium pressure in the middle cavity 32 of the valve body 1, so the pressurized medium in the middle cavity 32 of the valve body 1 can push the right valve seat 6 to move rightward, so that the right valve seat 6 is separated from the valve ball 4, and the pressurized medium flows into the right flow channel hole 9, thereby The medium pressure in the left valve seat cavity 10 is lower than the medium pressure in the left flow channel hole 8. The left valve seat 5 moves to the left side and separates from the valve ball 4 under the push of the medium pressure in the left flow channel hole 8, so that the pressurized medium enters the middle cavity 32 of the valve body 1 through the contact surface between the left valve seat 5 and the valve ball 4. At this time, the upper valve stem 7 is rotated to drive the valve ball to rotate 90 degrees, so that the through hole on the valve ball 4 is connected with the flow channel hole of the ball valve, and the ball valve is opened; the working principle when the medium flows in from the right flow channel hole 9 is similar to this and will not be repeated here.
[0058] When closing the ball valve, the upper valve stem 7 is rotated in the opposite direction to drive the valve ball 4 to rotate 90 degrees, so that the through hole on the valve ball 4 is staggered with the flow channel hole of the ball valve to close the ball valve, and then the left guide valve 21 is closed, and the pressurized medium enters the left valve seat cavity 10. The pressurized medium in the left valve seat cavity 10 and the left valve seat spring 12 push the left valve seat 5 together, so that the left valve seat 5 and the valve ball 4 fit more closely to achieve sealing. When the medium flows in from the right flow channel hole 9, the working principle is similar to this, which will not be repeated here. For the contents not mentioned in this embodiment, please refer to the previous general description.
[0059] Whether it is embodiment one or embodiment two, a left sealing ring 23 is further provided between the left valve seat 5 and the left valve cover 2, the first left guide hole 16 and the left outer throttling channel 14 are located on the left side of the left sealing ring 23 to improve the sealing performance of the left valve seat cavity 10, and a right sealing ring 24 is further provided between the right valve seat 6 and the right valve cover 3, the first right guide hole 18 and the right outer throttling channel 15 are located on the right side of the right sealing ring 24 to improve the sealing performance of the right valve seat cavity 11; and the hard-sealed ball valve also includes a lower valve stem 25, which is rotatably connected to the lower end of the valve ball 4, and the valve ball 4 is supported by the lower valve stem 25 to improve the position stability of the valve ball 4 in the valve body 1.
[0060] Example 3: See Figure 5 , Figure 6, the present application also provides another form of hard-sealed ball valve, including a valve body 1, a left valve cover 2, a right valve cover 3, a valve ball 4, a left valve seat 5, a right valve seat 6 and an upper valve stem 7, the left valve cover 2 is provided with a left flow channel hole 8, the right valve cover 3 is provided with a right flow channel hole 9, the left valve cover 2 and the right valve cover 3 are respectively arranged at the left and right ends of the valve body 1, the valve ball 4 with a through hole inside is arranged in the middle cavity 32 of the valve body 1, a left valve seat 5 is arranged between the left valve cover 2 and the valve ball 4, a left valve seat cavity 10 is formed between the left valve seat 5 and the left valve cover 2, a right valve seat 6 is arranged between the right valve cover 3 and the valve ball 4, and a right valve seat cavity 11 is formed between the right valve seat 6 and the right valve cover 3;
[0061] The valve seat located upstream is not sealed with the valve ball 4, and at least the valve seat located downstream is provided with a valve seat cavity guide hole, the valve seat cavity guide hole includes a first guide hole and a second guide hole, one end of the first guide hole is connected to the flow channel hole located downstream, and the other end of the first guide hole is connected to the second guide hole, the valve seat cavity located downstream includes a valve seat inner cavity and a valve seat outer cavity, a valve seat spring is installed in the valve seat outer cavity, the valve seat inner cavity is connected to the other end of the second guide hole, and an inner throttling channel is provided on the inner side of the valve seat located downstream (the inner side refers to the valve seat and the inner throttling channel). The valve seat inner cavity located downstream is connected with the middle cavity 32 of the valve body 1 through the internal throttling channel. The area of the wall perpendicular to the axis of the flow channel hole in the inner cavity of the valve seat located downstream is larger than the area of the wall in contact with the middle cavity of the valve body and the valve seat located downstream. A guide valve is provided at the connection between the first guide hole or the second guide hole or the first guide hole and the second guide hole to connect the inner cavity of the valve seat located downstream and the flow channel hole located downstream or to disconnect the connection between the inner cavity of the valve seat located downstream and the flow channel hole located downstream.
[0062] When the pressurized medium is introduced from the left side, the left side is the upstream and the right side is the downstream; when the pressurized medium is introduced from the right side, the right side is the upstream and the left side is the downstream.
[0063] Only one group of guide holes in the valve seat cavity can be provided, or two or more groups can be provided. A short pipe connection can be provided between the guide holes in the valve seat cavity and the guide valve. The guide valve is a left and right separate structure, or is one of a valve group structure, a multi-way valve structure, an integral structure, and an upper valve stem transmission structure.
[0064] When the valve seat cavity guide hole is only provided on the valve seat located downstream, the pressurized medium can only be introduced from one side. In order to broaden the application scope of the sealed ball valve, the present application provides valve seat cavity guide holes on both the valve seat located upstream and the valve seat located downstream. Specifically, when the left valve seat 5 and the valve ball 4 are not sealed, the right valve cover 3 is provided with a right valve seat cavity guide hole, the right valve seat cavity guide hole includes a first right guide hole 18 and a second right guide hole 19, one end of the first right guide hole 18 is connected to the right flow channel hole 9, and the other end of the first right guide hole 18 is connected to the second right guide hole 19, the right valve seat cavity 11 includes a right valve seat inner cavity 26 and a right valve seat outer cavity 27, the right valve seat spring 13 is disposed in the right valve seat outer cavity 27, the second right guide hole 19 is connected to the right valve seat inner cavity 26, and a right inner throttling channel 28 is provided on the inner side of the right valve seat 6, and the right valve seat inner cavity 26 is connected to the valve body 1 through the right inner throttling channel 28. The middle cavity 32 is connected, and the area of the wall D in the right valve seat inner cavity 26 that is perpendicular to the axis of the flow channel hole is larger than the area of the wall E in contact with the middle cavity 32 of the valve body 1 and the right valve seat 6. In the case where the left valve seat 5 and the right valve seat 6 are an integral structure, the wall D and the wall E only refer to the part located on the right side of the valve ball 4. It is assumed that the pressure exerted by the medium in the right valve seat inner cavity 26 on the right valve seat 6 is F1, and the pressure exerted by the medium in the middle cavity 32 of the valve body 1 on the right valve seat 6 is F2. Since the medium pressure in the right valve seat inner cavity 26 is equal to the medium pressure in the middle cavity 32 of the valve body 1, F1>F2. After the right valve seat inner cavity 26 is filled with the medium, the right valve seat 6 will move to the left under the push of the medium and fit tightly with the valve ball 4. A right guide valve 22 is provided at the connection between the first right guide hole 18 or the second right guide hole 19 or the first right guide hole 18 and the second right guide hole 19;
[0065] When the right valve seat 6 and the valve ball 4 are not sealed, a left valve seat cavity guide hole is provided on the left valve cover 2, and the left valve seat cavity guide hole includes a first left guide hole 16 and a second left guide hole 17. One end of the first left guide hole 16 is connected to the left flow channel hole 8, and the other end of the first left guide hole 16 is connected to the second left guide hole 17. The left valve seat cavity 10 includes a left valve seat inner cavity 29 and a left valve seat outer cavity 30. The left valve seat spring 12 is disposed in the left valve seat outer cavity 30. The second left guide hole 17 is connected to the left valve seat inner cavity 29. A left inner throttling channel 31 is provided on the inner side of the left valve seat 5. The left valve seat inner cavity 29 is connected to the middle cavity of the valve body 1 through the left inner throttling channel 31. 32 are connected, the area of the wall F in the left valve seat inner cavity 29 that is perpendicular to the axis of the flow channel hole is larger than the area of the wall G in contact with the middle cavity 32 of the valve body 1 and the left valve seat 5, wherein, in the case where the left valve seat 5 and the right valve seat 6 are an integral structure, the wall F and the wall G only refer to the part located on the left side of the valve ball 4, which is similar to the situation when the left valve seat 5 and the valve ball 4 are not sealed. When the left valve seat inner cavity 29 is filled with medium, the medium will push the left valve seat 5 to move rightward and fit tightly with the valve ball 4, and a left guide valve 21 is provided at the connection between the first left guide hole 16 or the second left guide hole 17 or the first left guide hole 16 and the second left guide hole 17.
[0066] The working principle of the hard-sealed ball valve is explained by taking the case where the pressurized medium flows in from the left side as an example. When the ball valve is in the closed state, the left valve seat 5 and the valve ball 4 are not sealed, and the pressurized medium from the upstream will squeeze into the fitting part between the left valve seat 5 and the valve ball 4, pushing the left valve seat 5 to move to the left to separate from the valve ball 4. The pressurized medium enters the middle cavity 32 of the valve body 1 through the narrow gap formed between the left valve seat 5 and the valve ball 4, and enters the right valve seat inner cavity 26 through the right inner throttling channel 28. After the medium fills the right valve seat inner cavity 26, the medium pushes the right valve seat 6 to move to the left and fits tightly with the valve ball 4, so that the right valve seat 6 and the valve ball 4 are sealed; the working principle when the pressurized medium flows in from the right side is similar to this, and will not be repeated here. The valve of this embodiment is a structural form in which the upstream valve seat is not sealed and the downstream valve seat is sealed.
[0067] When the ball valve is opened, the pressurized medium from the upstream enters the middle cavity 32 of the valve body 1 through the narrow gap formed between the left valve seat 5 and the valve ball 4, and then the right guide valve 22 is opened, so that the medium in the middle cavity 32 of the valve body 1 flows into the right flow channel hole 9 through the right inner throttling channel 28, the second right guide hole 19, and the first right guide hole 18, so as to relieve the pressure of the right valve seat inner cavity 26, so that the medium pressure in the middle cavity 32 of the valve body 1 is greater than the medium pressure in the right valve seat inner cavity 26, and the medium in the middle cavity 32 of the valve body 1 pushes the right valve seat 6 to move rightward, so that the right valve seat 6 is separated from the valve ball 4, and the medium flows into the right flow channel hole 9 through the narrow gap formed between the right valve seat 6 and the valve ball 4. At this time, the upper valve stem 7 is rotated to drive the valve ball 4 to rotate 90°, so that the through hole on the valve ball 4 is connected with the flow channel hole of the ball valve, and the ball valve is opened; the working principle when the medium flows in from the right flow channel hole 9 is similar to this, which will not be repeated here.
[0068] When closing the ball valve, the upper valve stem 7 is rotated in the opposite direction to drive the valve ball 4 to rotate 90 degrees, so that the through hole on the valve ball 4 is staggered with the flow channel hole of the ball valve to close the ball valve, and then the right guide valve 22 is closed, so that the medium entering the inner cavity 26 of the right valve seat pushes the right valve seat 6 to move in the direction close to the valve ball 4, so that the right valve seat 6 and the valve ball 4 fit tightly to achieve sealing; the working principle when the medium flows in from the right flow channel hole 9 is similar to this and will not be repeated here.
[0069] In order to facilitate the pressurized medium to push open the valve seat, a gap 33 is provided at the position of the valve seat close to the flow channel hole, and the gap 33 does not cover the entire surface of the contact portion between the valve seat and the valve ball 4, so as to improve the sealing performance between the valve seat and the valve ball 4 when acting as the downstream.
[0070] A left sealing ring 23 is also provided between the left valve seat 5 and the left valve cover 2, and the second left guide hole 17 and the left inner throttling channel 31 are located on the right side of the left sealing ring 23 to improve the sealing performance of the left valve seat inner cavity 29. A right sealing ring 24 is also provided between the right valve seat 6 and the right valve cover 3, and the second right guide hole 19 and the right inner throttling channel 28 are located on the left side of the right sealing ring 24 to improve the sealing performance of the right valve seat inner cavity 26. The hard-sealed ball valve also includes a lower valve stem 25, which is rotatably connected to the lower end face of the valve ball 4, and the valve ball 4 is supported by the lower valve stem 25 to improve the position stability of the valve ball 4 in the valve body 1.
[0071] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.
Claims
1. A hard-sealed ball valve, characterized in that: The invention comprises a valve body, a left valve cover, a right valve cover, a valve ball, a left valve seat, a right valve seat and an upper valve stem. The left valve cover and the right valve cover with flow channel holes therein are respectively disposed at the left and right ends of the valve body. The valve ball with a through hole therein is disposed in the middle cavity of the valve body. The left valve seat is disposed between the left valve cover and the valve ball. A left valve seat cavity is formed between the left valve seat and the left valve cover. The right valve seat is disposed between the right valve cover and the valve ball. A right valve seat cavity is formed between the right valve seat and the right valve cover. A left valve seat spring is installed in the left valve seat cavity. A right valve seat spring is installed in the right valve seat cavity. The valve seat located upstream is not sealed with the valve ball. A valve seat cavity guide hole is provided on at least the valve seat located downstream. The valve seat cavity guide hole comprises a first guide hole and a second guide hole. One end of the first guide hole is connected to the valve ball. The flow channel holes located downstream are connected, the other end of the first guide hole is connected to the second guide hole, the valve seat cavity located downstream includes a valve seat inner cavity and a valve seat outer cavity, the valve seat spring is arranged in the valve seat outer cavity, the valve seat inner cavity is connected to the second guide hole, and an inner throttling channel is provided on the inner side of the valve seat located downstream, the valve seat inner cavity is connected to the middle cavity of the valve body through the inner throttling channel, the area of the wall surface perpendicular to the axis of the flow channel hole in the inner cavity of the valve seat located downstream is larger than the area of the wall surface contacting the middle cavity of the valve body and the valve seat located downstream, and a guide valve is provided at the connecting part of the first guide hole or the second guide hole or the first guide hole and the second guide hole to connect the inner cavity of the valve seat located downstream and the flow channel hole downstream or disconnect the connection between the inner cavity of the valve seat located downstream and the flow channel hole downstream.
2. The hard-sealed ball valve according to claim 1, characterized in that: The left valve seat is not sealed with the valve ball, a right valve seat cavity guide hole is provided on the right valve seat, the right valve seat cavity guide hole includes a first right guide hole and a second right guide hole, the first right guide hole is connected with the flow channel hole of the right valve cover, the right valve seat cavity includes a right valve seat inner cavity and a right valve seat outer cavity, a right valve seat spring is disposed in the right valve seat outer cavity, the right valve seat inner cavity is connected with the second right guide hole, a right inner throttling channel is provided on the inner side of the right valve seat, the right valve seat inner cavity is connected with the middle cavity of the valve body through the right inner throttling channel, and a right guide valve is provided at the first right guide hole or the second right guide hole or at the connection between the first right guide hole and the second right guide hole; The right valve seat is not sealed with the valve ball, a left valve seat is provided with a left valve seat chamber guide hole, the left valve seat chamber guide hole includes a first left guide hole and a second left guide hole, the first left guide hole is communicated with the flow channel hole of the left valve cover, the left valve seat chamber includes a left valve seat inner chamber and a left valve seat outer chamber, a left valve seat spring is disposed in the left valve seat outer chamber, the left valve seat inner chamber is communicated with the second left guide hole, a left inner throttling channel is provided on the inner side of the left valve seat, the left valve seat inner chamber is communicated with the middle chamber of the valve body through the left inner throttling channel, and a left guide valve is provided at the first left guide hole or the second left guide hole or at the connection between the first left guide hole and the second left guide hole.
3. The hard-sealed ball valve according to claim 2, characterized in that: A left sealing ring is also provided between the left valve seat and the left valve cover, and the second left guide hole and the left inner throttling channel are located on the right side of the left sealing ring. A right sealing ring is also provided between the right valve seat and the right valve cover, and the second right guide hole and the right inner throttling channel are located on the left side of the right sealing ring.
4. The hard-sealed ball valve according to claim 3, characterized in that: It also includes a lower valve stem, which is rotatably connected to the lower end of the valve ball.