A ball valve with self-controlled pressure shut-off

Abstract

This invention belongs to the field of valve technology, and specifically discloses a ball valve with self-controlled pressure shut-off. It includes a valve body with a sealing cavity in the center. A spherical valve core is rotatably mounted on the inner wall of the sealing cavity, with a through-hole in the center. An indicator groove is provided at the bottom of the valve body, and a transmission cavity is provided above the sealing cavity inside the valve body. When the pressure in the pipeline rises, a transmission component is triggered inside the valve body to rotate the spherical valve core, thereby opening the valve body for conduction. As the pressure increases, the transmission component is further activated. When the maximum pressure value of the valve is reached, the opening degree of the spherical valve core inside the valve body is at its maximum. At this point, a limiting component is triggered to limit the transmission component, preventing the spherical valve core from continuing to rotate and causing the opening degree to decrease. This device can automatically adjust the opening and closing of the valve according to changes in the internal pressure of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a ball valve that can automatically control pressure and shut off. Background Technology

[0002] A ball valve typically uses a ball with a circular passage as its opening and closing element. The ball rotates with the valve body to achieve the opening and closing action. The opening and closing element of a ball valve is a ball with a through hole that rotates about an axis perpendicular to the passage, thereby achieving the purpose of opening and closing the passage. In industrial or civil infrastructure construction, pipelines are often used to transport media. Due to pressure changes, the pipelines need to be regulated. To regulate flow, regulating mechanisms, especially ball valves, are used in the pipelines to ensure optimal operating conditions and environmental safety.

[0003] When ball valves are used in pipelines, existing ball valves usually require manual control to open and close. When the pressure in the pipeline changes, the ball valve cannot immediately make corresponding adjustment actions to automatically shut off or open the ball valve, which will have a certain impact on the normal operation of pipeline transportation. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a ball valve that can automatically control pressure and shut off.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a ball valve capable of self-controlled pressure cutoff, comprising a valve body, a sealing cavity located in the middle of the valve body, a spherical valve core rotatably disposed in the middle of the inner wall of the sealing cavity, the middle part of the spherical valve core being through-open, an indicator groove being provided at the bottom of the valve body, a transmission cavity being provided above the sealing cavity inside the valve body, a transmission component being disposed inside the transmission cavity, and a flow-draining component being disposed inside the valve body;

[0006] The ball valve core has a rotating shaft fixed at both the top and bottom. The rotating shaft at the top of the ball valve core slides through the transmission cavity, and the rotating shaft at the bottom of the ball valve core slides through the indicator groove. The valve housing is equipped with a limiting component that triggers the flow-guiding assembly to work.

[0007] Preferably, both ends of the valve body are fixed with connecting pipes that communicate with the interior of the sealing cavity. The outer surfaces of the two connecting pipes are provided with sealing nuts. An alarm light ring is fixed on one side edge of the outer surface of the valve body. A return pipe is fixed on the top of the valve body. A groove is opened on the top of the valve body on one side of the return pipe.

[0008] Preferably, the transmission assembly includes a hollow rubber ring, which is fixed between the inner walls of the valve body and close to the sealing cavity. An oil cavity is provided inside the valve body, and a bent flow channel penetrating into the hollow rubber ring is provided at one end of the oil cavity. A guide groove is provided between the inner walls of the two sides of the transmission cavity near the rear edge, and one end of the guide groove penetrates to the other end of the oil cavity.

[0009] Preferably, a rack is slidably arranged between the inner walls of the guide groove, and a piston is slidably arranged between the inner walls of the oil cavity. One end of the rack is fixed to one side of the piston, and sealing rings are provided on the outer surface of the piston near both sides. The outer surfaces of the two sealing rings are slidably and sealingly fitted with the inner wall of the oil cavity.

[0010] Preferably, a transmission gear ring is provided inside the transmission cavity, which meshes with the rack. The transmission gear ring is fixed on the rotating shaft located at the top of the spherical valve core. A triangular opening is provided on the top of the rack near the piston. An arc-shaped scale bar is provided on one side of the bottom surface of the indicator groove. A pointer is provided on the rotating shaft located at the bottom of the spherical valve core, with one end of the pointer extending to the inside of the arc-shaped scale bar.

[0011] Preferably, the limiting component includes an insulating plate, an adjustment cavity is provided inside the valve housing, the insulating plate slides between the inner walls of the adjustment cavity, a lifting rod is fixed to the top of the insulating plate, the top of the lifting rod slides through the inside of the groove, and a notch is provided on one side of the outer surface of the lifting rod near the top edge.

[0012] Preferably, a positioning insert is fixed to the bottom of the insulating plate, the bottom of the positioning insert slides through into the interior of the guide groove, and the bottom of the positioning insert engages inside the triangular opening. A spring is fixed to the top of the insulating plate, and the top of the spring is fixed to the inner top surface of the adjustment cavity.

[0013] Preferably, the insulating plate has a metal core inside, with both ends of the metal core extending through to the outer surfaces of both sides of the insulating plate. Copper patches are fixed to the inner walls of both sides of the adjustment cavity near the bottom edge. The two copper patches are electrically connected to the alarm light ring, and both ends of the metal core are in contact with the outer surfaces of the copper patches.

[0014] Preferably, the flow diversion assembly includes a bridge pipe, a reflux hole is provided on the top of the valve housing, the reflux hole is located inside the reflux pipe, the bridge pipe is located inside the reflux hole, and the outer surface of the bridge pipe is slidably sealed to the inner wall of the reflux hole, and an annular opening is provided on the inner top surface of the valve housing.

[0015] Preferably, the annular opening is located outside the reflux hole. The inner wall of the annular opening is provided with multiple first grid openings that penetrate into the reflux hole at equal intervals along the circumferential direction near the top edge. The outer surface of the bridge pipe is provided with multiple second grid openings at equal intervals along the circumferential direction near the bottom edge. The multiple first grid openings are all connected to each other with the second grid openings. The bottom of the bridge pipe extends below the multiple first grid openings. A side opening that penetrates into the reflux hole is provided on one side of the inner wall of the regulating cavity. A connecting rod is slidably arranged between the two inner walls of the side opening. One end of the connecting rod is fixed to the outer surface of the bridge pipe, and the other end is fixed to the outer surface of the insulating plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention can automatically adjust the opening and closing of the valve according to the pressure change inside the pipeline. When the pressure in the pipeline rises, the transmission component inside the valve body will be triggered to work, causing the ball valve core to rotate, thereby opening the valve body and conducting the flow. When the maximum pressure value of the valve is reached, the opening degree of the ball valve core inside the valve body is at its maximum. At this time, the limiting component will be triggered to limit the transmission component, preventing the ball valve core from continuing to rotate and causing the opening degree to decrease. At the same time, when the limiting component works, it will open the flow guiding component to guide the flow inside the valve body.

[0018] 2. When the transmission component of the present invention is working, after the internal pressure of the pipeline rises, the internal pressure of the pipeline will press the hollow rubber ring against the inner wall of the valve body, squeezing the hydraulic oil inside into the oil chamber, pushing the piston towards the transmission chamber. When pushing, it will drive the rack to slide, thereby driving the transmission gear ring to drive the spherical valve core to rotate, so that the opening of the spherical valve core gradually opens between the two connecting pipes, making the valve body conductive.

[0019] 3. When the limiting component of the present invention is working, when the pressure in the pipeline rises to the maximum through pressure value of the valve, the opening of the ball valve core and the opening between the two connecting pipes are at their maximum. At this time, the triangular port on the rack slides to the bottom of the positioning plate. Under the action of the elastic force of the spring, the positioning plate is pressed down and inserted into the triangular port, so as to position the rack.

[0020] 4. When the drainage component of this invention is working, when the positioning plate slides down and inserts into the triangular port, it will simultaneously drive the bridge pipe to slide down. At this time, the multiple second grid ports on the bridge pipe slide to the position opposite to the first grid port, so that the second grid ports and the first grid ports are connected to each other, and the liquid inside the valve body is drained to the outside to prevent the internal pressure from continuing to rise. Attached Figure Description

[0021] Figure 1 A top-view three-dimensional structural diagram of a ball valve capable of self-controlled pressure shut-off is provided for this invention;

[0022] Figure 2 A bottom-view three-dimensional structural diagram of a ball valve capable of self-controlled pressure shut-off is provided for this invention.

[0023] Figure 3 A side-sectional perspective three-dimensional structural diagram of a ball valve capable of self-controlled pressure cutoff proposed in this invention;

[0024] Figure 4 This invention provides a three-dimensional cross-sectional view of the other side of a ball valve capable of self-controlled pressure shut-off.

[0025] Figure 5This invention provides a cross-sectional perspective view of the transmission component in a ball valve capable of self-controlled pressure cutoff.

[0026] Figure 6 This invention provides a cross-sectional perspective view of the limiting component and the flow guiding component in a ball valve capable of self-controlled pressure cutoff.

[0027] Figure 7 The present invention provides a top-view three-dimensional structural diagram of the rack and transmission gear ring in a ball valve that can self-control pressure cut-off.

[0028] Figure 8 For the present invention Figure 4 A magnified view of a portion of point A in the middle;

[0029] Figure 9 For the present invention Figure 6 A magnified view of a portion of point B in the middle.

[0030] In the diagram: 1. Valve housing; 2. Connecting pipe; 3. Sealing nut; 4. Return pipe; 5. Groove; 6. Indicator groove; 7. Arc-shaped scale bar; 8. Pointer; 9. Rotating shaft; 10. Alarm light ring; 11. Sealing cavity; 12. Ball valve core; 13. Hollow rubber ring; 14. Transmission cavity; 15. Oil cavity; 16. Bending flow channel; 17. Transmission gear ring; 18. Rack; 19. Guide groove; 20. Triangular opening; 21. Piston; 22. Sealing ring; 23. Positioning plate; 24. Adjustment cavity; 25. Lifting rod; 26. Spring; 27. Insulating plate; 28. Copper patch; 29. ​​Metal core; 30. Return hole; 31. Bridge pipe; 32. Side opening; 33. Connecting rod; 34. Twisted joint; 35. Annular opening; 36. First grid opening; 37. Second grid opening. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-9 The present invention provides a technical solution: a ball valve that can control pressure and cut off automatically, including a valve body 1, a sealing cavity 11 is provided in the middle of the valve body 1, a spherical valve core 12 is rotatably sealed in the middle of the inner wall of the sealing cavity 11, the middle part of the spherical valve core 12 is open through, an indicator groove 6 is provided at the bottom of the valve body 1, a transmission cavity 14 is provided in the valve body 1 above the sealing cavity 11, a transmission component is provided in the transmission cavity 14, and a flow-draining component is provided in the valve body 1.

[0033] The top and bottom of the spherical valve core 12 are fixed with rotating shafts 9. The rotating shaft 9 at the top of the spherical valve core 12 slides through the transmission cavity 14, and the rotating shaft 9 at the bottom of the spherical valve core 12 slides through the indicator groove 6. The valve housing 1 is provided with a limiting component that triggers the flow guiding component to work. Both ends of the valve housing 1 are fixed with connecting pipes 2 that communicate with the interior of the sealing cavity 11. The outer surfaces of the two connecting pipes 2 are provided with sealing nuts 3. An alarm light ring 10 is fixed near one edge of the outer surface of the valve housing 1. A return pipe 4 is fixed at the top of the valve housing 1. A groove 5 is opened on one side of the return pipe 4 at the top of the valve housing 1.

[0034] The effect achieved is as follows: the valve body 1 is connected to the external pipeline through the connecting pipes 2 at both ends. When the pressure in the pipeline is low, the valve body 1 is in a non-working state. When the pressure in the pipeline rises, the transmission component inside the valve body 1 will be triggered to work, causing the ball valve core 12 to rotate, thereby opening the valve body 1 for conduction. As the pressure rises, it will further drive the transmission component to work. When the maximum pressure value of the valve is reached, the opening degree of the ball valve core 12 inside the valve body 1 is at its maximum. At this time, the limit component will be triggered to limit the transmission component, preventing the ball valve core 12 from continuing to rotate and causing the opening degree to decrease. When the limit component works, it will open the flow-draining component to drain the flow inside the valve body 1, preventing the internal pressure from continuing to rise and causing a large pressure difference between the two ends of the valve body 1, which would cause pipeline vibration.

[0035] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the transmission assembly includes a hollow rubber ring 13, which is fixed between the inner walls of the valve housing 1 and near the sealing cavity 11. An oil cavity 15 is formed inside the valve housing 1. A bent flow channel 16, penetrating into the hollow rubber ring 13, is formed at one end of the oil cavity 15. A guide groove 19 is formed between the inner walls of both sides of the transmission cavity 14 near the rear edge. One end of the guide groove 19 extends to the other end of the oil cavity 15. A rack 18 is slidably arranged between the inner walls of the guide groove 19. A piston 21 is slidably arranged between the inner walls of the oil cavity 15. One end of the rack 18 is fixed to one side of the piston 21. A sealing ring 22 is provided on the outer surface of the piston 21 near both sides. The outer surfaces of the two sealing rings 22 are slidably sealed against the inner wall of the oil chamber 15. A transmission gear ring 17 is provided inside the transmission chamber 14. The transmission gear ring 17 meshes with the rack 18. The transmission gear ring 17 is fixed on the rotating shaft 9 located at the top of the ball valve core 12. A triangular opening 20 is provided on the top of the rack 18 near the piston 21. An arc-shaped scale bar 7 is provided on one side of the inner bottom surface of the indicator groove 6. A pointer 8 is provided on the rotating shaft 9 located at the bottom of the ball valve core 12. One end of the pointer 8 extends to the inner side of the arc-shaped scale bar 7.

[0036] The effect achieved is as follows: initially, the hollow rubber ring 13 and the oil cavity 15 are filled with hydraulic oil. The piston 21 is located inside the oil cavity 15 near the bent flow channel 16. The opening of the spherical valve core 12 is located inside the sealing cavity 11 and is not connected to the connecting pipes 2 at both ends of the valve body 1. When the pressure inside the pipeline rises after the valve body 1 is connected, the pressure inside the pipeline will push the hollow rubber ring 13 against the inner wall of the valve body 1. When the hollow rubber ring 13 is under pressure, it will squeeze the internal hydraulic oil into the oil cavity 15, thereby pushing the piston 21 inside the oil cavity 15 towards... The transmission chamber 14 is pushed from one side, which causes the rack 18 to slide, thereby driving the transmission gear ring 17 to drive the ball valve core 12 to rotate. This causes the opening of the ball valve core 12 to gradually open between the two connecting pipes 2, making the valve body 1 conductive. As the ball valve core 12 rotates, it causes the pointer 8 to rotate synchronously. As the ball valve core 12 rotates, one end of the pointer 8 will slide synchronously on the inner side of the arc-shaped scale bar 7. By observing the relative position of one end of the pointer 8 and the inner scale of the arc-shaped scale bar 7, people can determine the position of the ball valve core 12.

[0037] like Figure 1 , Figure 4 , Figure 7 and Figure 8 As shown, the limiting assembly includes an insulating plate 27. An adjustment cavity 24 is provided inside the valve housing 1. The insulating plate 27 slides between the inner walls of the adjustment cavity 24. A lifting rod 25 is fixed to the top of the insulating plate 27. The top of the lifting rod 25 slides through the interior of the groove 5. A bevel 34 is provided on one side of the outer surface of the lifting rod 25 near the top edge. A positioning insert 23 is fixed to the bottom of the insulating plate 27. The bottom of the positioning insert 23 slides through the interior of the guide groove 19, and the bottom of the positioning insert 23 is engaged inside the triangular opening 20. A spring 26 is fixed to the top of the insulating plate 27. The top of the spring 26 is fixed to the inner top surface of the adjustment cavity 24. A metal core 29 is provided inside the insulating plate 27. The two ends of the metal core 29 extend through the outer surfaces of the two sides of the insulating plate 27. Copper patches 28 are fixed to the inner walls of the two sides of the adjustment cavity 24 near the bottom edge. The two copper patches 28 are electrically connected to the alarm light ring 10. The two ends of the metal core 29 are respectively attached to the outer surfaces of the copper patches 28.

[0038] The effect achieved is that when the rack 18 slides, the bottom of the positioning plate 23 slides and fits against the top of the rack 18. When the pressure in the pipeline rises to the maximum through pressure value of the valve, the opening of the ball valve core 12 and the opening between the two connecting pipes 2 are at their maximum. At this time, the triangular port 20 on the rack 18 slides to the bottom of the positioning plate 23. Under the elastic force of the spring 26, the positioning plate 23 is pressed down and inserted into the triangular port 20, thus positioning the rack 18 and preventing it from continuing to drive the transmission gear ring 17 and the ball valve. As the core 12 continues to rotate, the opening between the ball valve core 12 and the connecting pipe 2 becomes smaller. Before the positioning plate 23 is inserted into the triangular port 20, the metal core 29 on the insulating plate 27 is positioned above the two copper patches 28. When the plate 23 is inserted into the triangular port 20, it will cause the insulating plate 27 to slide downward. At this time, the two ends of the metal core 29 are in contact with the two copper patches 28, which will make the circuit conduction and open the external alarm light ring 10, alerting people that the pressure inside the valve body 1 has reached the maximum value, which will facilitate maintenance and repair.

[0039] like Figure 3 Figure 6 and Figure 9 As shown, the drainage assembly includes a bridging pipe 31. A return hole 30 is formed on the top of the valve housing 1, located inside the return pipe 4. The bridging pipe 31 is located inside the return hole 30, and its outer surface is slidably sealed to the inner wall of the return hole 30. An annular opening 35 is formed on the inner top surface of the valve housing 1, located outside the return hole 30. Multiple first grid openings 36, penetrating into the return hole 30, are equidistantly formed along the circumferential direction on the inner wall of the annular opening 35 near its top edge. Multiple second grid openings 37 are equidistantly provided along the circumferential direction on the outer surface of the tube 31 near the bottom edge. Multiple first grid openings 36 are connected to the second grid openings 37. The bottom of the bridge tube 31 extends below the multiple first grid openings 36. A side opening 32 is provided on one side inner wall of the regulating cavity 24, which penetrates into the reflux hole 30. A connecting rod 33 is slidably provided between the two inner walls of the side opening 32. One end of the connecting rod 33 is fixed on the outer surface of the bridge tube 31, and the other end is fixed on the outer surface of the insulating plate 27.

[0040] The effect achieved is that when the positioning plate 23 is not inserted into the triangular port 20, the multiple second grid ports 37 on the bridge pipe 31 are all located above the first grid port 36. Inside the return hole 30, the first grid port 36 is sealed by sliding and sealing the outer surface of the bridge pipe 31 with the inner wall of the return hole 30. When the positioning plate 23 slides down and inserts into the triangular port 20, it will simultaneously drive the bridge pipe 31 to slide down. At this time, the multiple second grid ports 37 on the bridge pipe 31 slide to the position opposite to the first grid port 36. At this time, the second grid ports 37 and the first grid ports 36 are interconnected. The fluid inside the valve body 1 can enter the bridge pipe 31 through the second grid ports 37 and the first grid ports 36, and then be discharged from the return pipe 4, preventing the pressure inside the valve body 1 from continuing to rise, which would increase the pressure difference between the two ends of the valve and cause vibration in the pipeline.

[0041] Working principle: When using this device, the valve body 1 is connected to the external pipeline through the connecting pipes 2 at both ends. Initially, the hollow rubber ring 13 and the oil chamber 15 are filled with hydraulic oil. The piston 21 is located inside the oil chamber 15 near the bent flow channel 16. The opening of the spherical valve core 12 is located in the sealing cavity 11 and is not connected to the connecting pipes 2 at both ends of the valve body 1. After the valve body 1 is properly connected, when the pressure inside the pipeline rises, the pressure inside the pipeline will push the hollow rubber ring 13 against the inner wall of the valve body 1. When the hollow rubber ring 13 is under pressure, it will squeeze the internal hydraulic oil into the oil chamber 15, thereby pushing the piston 21 inside the oil chamber 15. 1. Pushing towards the transmission chamber 14 causes the rack 18 to slide, which in turn drives the transmission gear ring 17 to rotate the ball valve core 12. This gradually opens the opening of the ball valve core 12 between the two connecting pipes 2, allowing the valve body 1 to conduct. As the rack 18 slides, the bottom of the positioning plate 23 slides against the top of the rack 18. When the pressure in the pipeline rises to the valve's maximum through pressure, the opening of the ball valve core 12 is at its maximum between the opening and the two connecting pipes 2. At this time, the triangular opening 20 on the rack 18 slides to the bottom of the positioning plate 23. Under the elastic force of the spring 26, the positioning plate 23 is pushed... 3. Pressing down into the triangular port 20 positions the rack 18, preventing it from continuing to drive the transmission gear ring 17 and the ball valve core 12 to rotate. This reduces the opening between the ball valve core 12 and the connecting pipe 2. When the positioning insert 23 slides downward, it will cause the insulating plate 27 to slide downward. At this time, the two ends of the metal core 29 are in contact with the two copper patches 28, making the circuit conductive and turning on the external alarm light ring 10. When the positioning insert 23 is not inserted into the triangular port 20, the multiple second grid openings 37 on the bridge pipe 31 are all located above the first grid opening 36. The flow through the bridge pipe 31 inside the return hole 30... The outer surface of the valve body slidably seals against the inner wall of the return hole 30 to close the first grid port 36. When the positioning plate 23 slides down and inserts into the triangular port 20, it will simultaneously drive the bridge pipe 31 to slide down. At this time, the multiple second grid ports 37 on the bridge pipe 31 slide to the position opposite to the first grid port 36. At this time, the second grid ports 37 and the first grid ports 36 are connected to each other. The fluid inside the valve body 1 can enter the bridge pipe 31 through the second grid ports 37 and the first grid ports 36, and then be discharged from the return pipe 4 to prevent the pressure inside the valve body 1 from continuing to rise, which would increase the pressure difference between the two ends of the valve and cause vibration in the pipeline.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-pressurized and self-cutoff ball valve, characterized in that, The valve includes a valve housing (1), a sealing cavity (11) is provided in the middle of the valve housing (1), a spherical valve core (12) is provided in the middle of the inner wall of the sealing cavity (11), the middle part of the spherical valve core (12) is open through, an indicator groove (6) is provided at the bottom of the valve housing (1), a transmission cavity (14) is provided above the sealing cavity (11) inside the valve housing (1), a transmission assembly is provided inside the transmission cavity (14), and a flow-draining assembly is provided inside the valve housing (1). The top and bottom of the spherical valve core (12) are both fixed with rotating shafts (9). The rotating shaft (9) at the top of the spherical valve core (12) slides through into the transmission cavity (14), and the rotating shaft (9) at the bottom of the spherical valve core (12) slides through into the indicator groove (6). The valve housing (1) is provided with a limiting component that triggers the flow-guiding component to work. The transmission assembly includes a hollow rubber ring (13), which is fixed between the inner walls of the valve housing (1) and close to the sealing cavity (11). An oil cavity (15) is provided inside the valve housing (1). A bent flow channel (16) penetrating into the hollow rubber ring (13) is provided at one end of the oil cavity (15). A guide groove (19) is provided between the inner walls of both sides of the transmission cavity (14) near the rear edge. One end of the guide groove (19) extends to the other end of the oil cavity (15). A rack (18) is slidably arranged between the inner walls of the guide groove (19). A piston (21) is slidably arranged between the inner walls of the oil cavity (15). One end of the rack (18) is fixed to one side of the piston (21). (21) has sealing rings (22) on both sides near the outer surface of the outer surface of the two sealing rings (22). The outer surfaces of the two sealing rings (22) are in sliding seal with the inner wall of the oil cavity (15). The transmission cavity (14) has a transmission gear ring (17) inside. The transmission gear ring (17) meshes with the rack (18). The transmission gear ring (17) is fixed on the rotating shaft (9) at the top of the spherical valve core (12). The top of the rack (18) is provided with a triangular opening (20) near the piston (21). The inner bottom surface of the indicator groove (6) is provided with an arc-shaped scale bar (7). The rotating shaft (9) at the bottom of the spherical valve core (12) is provided with a pointer (8). One end of the pointer (8) extends to the inner side of the arc-shaped scale bar (7).

2. The self-pressure-controlling and self-cutting ball valve according to claim 1, wherein: Both ends of the valve housing (1) are fixed with connecting pipes (2) that connect to the inside of the sealing cavity (11). The outer surfaces of the two connecting pipes (2) are provided with sealing nuts (3). An alarm light ring (10) is fixed on one side of the outer surface of the valve housing (1). A return pipe (4) is fixed on the top of the valve housing (1). A groove (5) is opened on the top of the valve housing (1) on one side of the return pipe (4).

3. The ball valve with self-controlled pressure shut-off according to claim 2, characterized in that: The limiting component includes an insulating plate (27), and an adjustment cavity (24) is provided inside the valve housing (1). The insulating plate (27) slides between the inner walls of the adjustment cavity (24). A lifting rod (25) is fixed to the top of the insulating plate (27). The top of the lifting rod (25) slides through the interior of the groove (5). A bevel (34) is provided on one side of the outer surface of the lifting rod (25) near the top edge.

4. A ball valve with self-controlled pressure shut-off according to claim 3, characterized in that: The bottom of the insulating plate (27) is fixed with a positioning insert (23), the bottom of the positioning insert (23) slides through into the interior of the guide groove (19), and the bottom of the positioning insert (23) is engaged in the interior of the triangular opening (20). The top of the insulating plate (27) is fixed with a spring (26), and the top of the spring (26) is fixed on the inner top surface of the adjustment cavity (24).

5. A ball valve with self-controlled pressure shut-off according to claim 4, characterized in that: The insulating plate (27) is provided with a metal core (29) inside. The two ends of the metal core (29) extend to the outer surfaces of both sides of the insulating plate (27). Copper patches (28) are fixed on the inner walls of both sides of the adjustment cavity (24) near the bottom edge. The two copper patches (28) are electrically connected to the alarm light ring (10). The two ends of the metal core (29) are respectively attached to the outer surfaces of the copper patches (28).

6. A ball valve with self-controlled pressure shut-off according to claim 5, characterized in that: The drainage assembly includes a bridge pipe (31), and a return hole (30) is provided on the top of the valve housing (1). The return hole (30) is located inside the return pipe (4). The bridge pipe (31) is located inside the return hole (30), and the outer surface of the bridge pipe (31) and the inner wall of the return hole (30) are slidably sealed together. An annular opening (35) is provided on the inner top surface of the valve housing (1).

7. A ball valve capable of self-controlled pressure shut-off according to claim 6, characterized in that: The annular opening (35) is located outside the reflux hole (30). The inner wall of the annular opening (35) is provided with multiple first grid openings (36) that penetrate into the reflux hole (30) at equal intervals along the circumferential direction near the top edge. The outer surface of the bridge pipe (31) is provided with multiple second grid openings (37) that are provided at equal intervals along the circumferential direction near the bottom edge. The multiple first grid openings (36) are connected to the second grid openings (37). The bottom of the bridge pipe (31) extends below the multiple first grid openings (36). The inner wall of one side of the regulating cavity (24) is provided with a side opening (32) that penetrates into the reflux hole (30). A connecting rod (33) is slidably arranged between the inner walls of the two sides of the side opening (32). One end of the connecting rod (33) is fixed on the outer surface of the bridge pipe (31), and the other end is fixed on the outer surface of the insulating plate (27).

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