Ball valve capable of automatically controlling pressure and cutting off

Abstract

The invention belongs to the technical field of valves, and particularly discloses a self-pressure-control cut-off ball valve which comprises a valve shell, a sealing cavity is formed in the middle of the interior of the valve shell, a spherical valve element is rotationally arranged in the middle of the inner wall of the sealing cavity in a sealed mode, the middle of the spherical valve element is in a through opening shape, and an indicating groove is formed in the bottom of the valve shell. When pressure in a pipeline rises, the transmission assembly can be triggered in the valve shell to work so that the spherical valve element can rotate, then the valve shell is opened and conducted, the transmission assembly can be further driven to work along with pressure rising, and when the maximum pressure value of the valve is reached, the transmission assembly can be driven to rotate, so that the transmission assembly can be driven to rotate. At the moment, the opening degree of the spherical valve element in the valve shell is in the maximum state, the limiting assembly is triggered to limit the transmission assembly at the moment, the situation that the spherical valve element continues to rotate, and consequently the opening degree is decreased is prevented, and opening and closing of the valve can be automatically adjusted according to changes of the pressure in the pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a self-pressure control and cutting ball valve. BACKGROUND

[0002] The ball valve is usually used with a ball body with a circular channel as an opening and closing element, and the ball body rotates with the valve body to realize the opening and closing action. The opening and closing element of the ball valve is a ball body with a through hole, which rotates around the axis perpendicular to the channel to achieve the purpose of opening and closing the channel. In industrial or civil infrastructure, pipeline is usually used to transport medium, and the pipeline needs to be adjusted due to pressure changes. In order to adjust the flow, adjusting mechanism is used in the pipeline, especially ball valve, to ensure the best working condition and safety of the environment.

[0003] When the ball valve is used in the pipeline, the existing ball valve usually needs to be manually controlled to be turned on or off. When the pressure in the pipeline changes, the ball valve cannot be automatically cut off or opened immediately to make corresponding adjustment, which affects the normal operation of the pipeline transportation. SUMMARY

[0004] The present application provides a self-pressure control and cutting ball valve to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a self-pressure control and cutting ball valve, comprising a valve shell, a sealing cavity is formed in the middle of the inside of the valve shell, a spherical valve core is sealingly and rotatably arranged in the middle of the inner wall of the sealing cavity, the middle part of the spherical valve core is in the form of a through opening, an indicating groove is formed in the bottom of the valve shell, a transmission cavity is formed above the sealing cavity in the inside of the valve shell, a transmission assembly is arranged in the transmission cavity, and a drainage assembly is arranged in the inside of the valve shell. The top and bottom of the spherical valve core are fixed with rotating shafts, the rotating shaft located at the top of the spherical valve core slides through the transmission cavity, the rotating shaft located at the bottom of the spherical valve core slides through the inside of the indicating groove, and the inside of the valve shell is provided with a limiting assembly for triggering the drainage assembly to work.

[0006] Preferably, the two ends of the valve shell are fixed with butt pipes connected to the inside of the sealing cavity, the outer surfaces of the two butt pipes are provided with sealing nuts, the outer surface of the valve shell is fixed with an alarm lamp ring near one side edge, the top of the valve shell is fixed with a return pipe, and a groove is formed in the top of the valve shell on one side of the return pipe.

[0007] Preferably, the transmission assembly comprises a hollow rubber ring, the hollow rubber ring is fixed between the inner walls of the valve shell and near one side of the sealing cavity, an oil cavity is formed in the inside of the valve shell, one end of the oil cavity is provided with a bent flow channel penetrating into the inside of the hollow rubber ring, a guide groove is formed between the two inner walls of the transmission cavity near the rear side edge, and one end of the guide groove penetrates into the other end of the oil cavity.

[0008] Preferably, a rack is slidably arranged between the inner walls of the guide groove, 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 the outer surface of the piston is provided with a sealing ring near the two side edges, and the outer surfaces of the two sealing rings are in sliding sealing fit with the inner walls of the oil cavity.

[0009] Preferably, a transmission gear ring is arranged inside the transmission cavity, the transmission gear ring is in meshing engagement with the rack, the transmission gear ring is fixed to the rotating shaft at the top of the spherical valve core, a triangular port is formed in the top of the rack near the piston side, an arc-shaped scale bar is arranged inside the indicating groove near one side, a pointer is arranged on the rotating shaft at the bottom of the spherical valve core, and one end of the pointer extends to the inside of the arc-shaped scale bar.

[0010] Preferably, the limiting assembly comprises an insulating plate, an adjusting cavity is formed in the inside of the valve housing, the insulating plate is slidably arranged between the inner walls of the adjusting cavity, a lifting rod is fixed to the top of the insulating plate, the lifting rod is slidably penetrated into the inside of the groove, and a notch is formed in the outer surface of the lifting rod near the top edge on one side.

[0011] Preferably, a positioning plug is fixed to the bottom of the insulating plate, the positioning plug is slidably penetrated into the inside of the guide groove, and the positioning plug is clamped in the triangular port, 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 adjusting cavity.

[0012] Preferably, a metal core is arranged inside the insulating plate, the two ends of the metal core are correspondingly penetrated to the outer surfaces of the two sides of the insulating plate, copper patches are fixed to the inner walls of the two sides of the adjusting cavity near the bottom edges, the two copper patches are electrically connected with the alarm lamp ring, and the two ends of the metal core are correspondingly in mutual fit with the outer surfaces of the copper patches.

[0013] Preferably, the drainage assembly comprises a bridging pipe, a backflow hole is formed in the top of the valve housing, the backflow hole is located on the inner side of the backflow pipe, the bridging pipe is located in the inside of the backflow hole, the outer surface of the bridging pipe is in sliding sealing fit with the inner wall of the backflow hole, and an annular port is formed in the inner top surface of the valve housing.

[0014] Preferably, the annular port is located on the outer side of the backflow hole, a plurality of first grid ports are equidistantly formed in the inner wall of the annular port near the top edge in the circumferential direction and are penetrated into the inside of the backflow hole, a plurality of second grid ports are equidistantly formed in the outer surface of the bridging pipe near the bottom edge in the circumferential direction, the plurality of first grid ports are correspondingly in communication with the second grid ports, the bottom of the bridging pipe extends below the plurality of first grid ports, a side port is formed in the inner wall of one side of the adjusting cavity and is penetrated into the inside of the backflow hole, a connecting rod is slidably arranged between the two inner walls of the side port, one end of the connecting rod is fixed to the outer surface of the bridging pipe, and the other end of the connecting rod is fixed to the outer surface of the insulating plate.

[0015] Compared with the prior art, the present application has the following advantages: 1. The application can automatically adjust the opening and closing of the valve according to the change of the internal pressure of the pipeline, when the pressure in the pipeline rises, the transmission assembly will work in the internal of the valve shell, the spherical valve core will rotate, and then the valve shell will be opened and conducted, when the maximum pressure value of the valve is reached, the opening degree of the spherical valve core in the internal of the valve shell is the maximum state, at this time, the limiting assembly will limit the transmission assembly to prevent the spherical valve core from continuing to rotate and causing the opening degree to become smaller, and at the same time, the limiting assembly will conduct the drainage assembly to drain the flow in the internal of the valve shell; 2. When the transmission assembly works in the application, after the internal pressure of the pipeline rises, the internal pressure of the pipeline will press the hollow rubber ring to the internal wall of the valve shell, and the internal hydraulic oil of the hollow rubber ring will be extruded to the internal of the oil cavity, the piston will be pushed to the transmission cavity side, when pushing, the rack will slide, and then the transmission gear ring will drive the spherical valve core to rotate, the opening of the spherical valve core and the two butt joints will be gradually opened, and the valve shell will be conducted; 3. When the limiting assembly works in the application, when the pressure in the pipeline rises to the maximum passing pressure value of the valve, the opening degree between the opening of the spherical valve core and the two butt joints is the maximum state, and at this time, the triangular port on the rack slides to the bottom of the positioning insert plate, and the positioning insert plate is inserted into the internal of the triangular port under the elastic force of the spring, so as to position the rack; 4. When the drainage assembly works in the application, when the positioning insert plate slides downward and inserts into the triangular port, the bridge pipe will slide downward at the same time, at this time, a plurality of second grid ports on the bridge pipe slide to the opposite position of the first grid port, so that the second grid port and the first grid port are connected with each other, the liquid in the internal of the valve shell is drained to the outside, and the internal pressure is prevented from continuing to rise. DETAILED DESCRIPTION

[0016] Figure 1 A top view of the application is provided, which is a self-pressure control and cutting ball valve; Figure 2 A bottom view of the application is provided, which is a self-pressure control and cutting ball valve; Figure 3 A side view of the application is provided, which is a self-pressure control and cutting ball valve; Figure 4 Another side view of the application is provided, which is a self-pressure control and cutting ball valve; Figure 5 A sectional view of the transmission assembly in the application is provided, which is a self-pressure control and cutting ball valve; Figure 6 A sectional view of the limiting assembly and the drainage assembly in the application is provided, which is a self-pressure control and cutting ball valve; Figure 7A top perspective view of the rack and transmission gear ring of the self-pressure control and cutting-off ball valve is provided in the present application; Figure 8 A top perspective view of the rack and transmission gear ring of the self-pressure control and cutting-off ball valve is provided in the present application Figure 4 A top perspective view of the rack and transmission gear ring of the self-pressure control and cutting-off ball valve is provided in the present application Figure 9 A top perspective view of the rack and transmission gear ring of the self-pressure control and cutting-off ball valve is provided in the present application Figure 6 A top perspective view of the rack and transmission gear ring of the self-pressure control and cutting-off ball valve is provided in the present application

[0017] In the figure: 1, valve shell; 2, butt joint pipe; 3, sealing nut; 4, return pipe; 5, groove; 6, indicating groove; 7, arc-shaped scale bar; 8, pointer; 9, rotating shaft; 10, alarm lamp ring; 11, sealing cavity; 12, spherical valve core; 13, hollow rubber ring; 14, transmission cavity; 15, oil cavity; 16, bent flow channel; 17, transmission gear ring; 18, rack; 19, guide groove; 20, triangular port; 21, piston; 22, sealing ring; 23, positioning insert plate; 24, adjusting cavity; 25, lifting rod; 26, spring; 27, insulating plate; 28, copper patch; 29, metal core; 30, return hole; 31, bridging pipe; 32, side port; 33, connecting rod; 34, curved port; 35, annular port; 36, first grid port; 37, second grid port. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Please refer to Figures 1-9 The present application provides a technical solution: a self-pressure control and cutting-off ball valve, which comprises a valve shell 1, a sealing cavity 11 is formed in the middle of the inside of the valve shell 1, a spherical valve core 12 is sealingly and rotatably arranged in the middle of the inner wall of the sealing cavity 11, the middle part of the spherical valve core 12 is in the form of a through opening, an indicating groove 6 is formed in the bottom of the valve shell 1, a transmission cavity 14 is formed above the sealing cavity 11 in the inside of the valve shell 1, a transmission assembly is arranged in the transmission cavity 14, and a drainage assembly is arranged in the inside of the valve shell 1; The top and bottom of the spherical valve core 12 are fixed with rotating shafts 9, the rotating shaft 9 located at the top of the spherical valve core 12 is slidably penetrated into the inside of the transmission cavity 14, the rotating shaft 9 located at the bottom of the spherical valve core 12 is slidably penetrated into the inside of the indicating groove 6, the inside of the valve shell 1 is provided with a limiting assembly for triggering the drainage assembly to work, the two ends of the valve shell 1 are fixed with the butt joint pipes 2 which are communicated to the inside of the sealing cavity 11, the outer surfaces of the two butt joint pipes 2 are provided with sealing nuts 3, the outer surface of the valve shell 1 is fixed with the alarm lamp ring 10 near one side edge, the top of the valve shell 1 is fixed with the backflow pipe 4, and the top of the valve shell 1 is provided with the recess 5 on one side of the backflow pipe 4.

[0020] The effect achieved is that the valve shell 1 is connected with external pipelines through the butt joint pipes 2 at the two ends, when the pressure in the pipeline is small, the valve shell 1 is in a non-working state, when the pressure in the pipeline rises, the transmission assembly is triggered to work in the inside of the valve shell 1, the spherical valve core 12 rotates, and then the valve shell 1 is opened and conducted, as the pressure rises, the transmission assembly is further driven to work, when the maximum pressure value of the valve is reached, the opening degree of the spherical valve core 12 in the inside of the valve shell 1 is in the maximum state, at this time, the limiting assembly is triggered to limit the transmission assembly, preventing the spherical valve core 12 from continuing to rotate to cause the opening degree to become small, when the limiting assembly works, the drainage assembly is conducted, the flow in the inside of the valve shell 1 is drained, preventing the internal pressure from continuing to rise to cause the pressure difference between the two ends of the valve shell 1 to be large, thereby causing the pipeline to vibrate.

[0021] As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 , the transmission assembly comprises a hollow rubber ring 13, the hollow rubber ring 13 is fixed between the inner walls of the valve shell 1 and is located near one side of the sealing cavity 11, the inside of the valve shell 1 is provided with an oil cavity 15, one end of the oil cavity 15 is provided with a bent flow channel 16 which is penetrated into the inside of the hollow rubber ring 13, the inside walls between the two sides of the transmission cavity 14 are provided with a guide groove 19 near the rear side edge, one end of the guide groove 19 is penetrated into the other end of the oil cavity 15, the inside walls of the guide groove 19 are slidably provided with a rack 18, the inside walls of the oil cavity 15 are slidably provided with a piston 21, one end of the rack 18 is fixed to one side of the piston 21, the outer surface of the piston 21 is provided with sealing rings 22 near the two side edges, the outer surfaces of the two sealing rings 22 are slidably and sealingly fitted with the inner walls of the oil cavity 15, the inside of the transmission cavity 14 is provided with a transmission gear ring 17, the transmission gear ring 17 is meshed with the rack 18, the transmission gear ring 17 is fixed on the rotating shaft 9 located at the top of the spherical valve core 12, the top of the rack 18 is provided with a triangular port 20 near one side of the piston 21, the inside bottom of the indicating groove 6 is provided with an arc-shaped scale bar 7 near one side, the rotating shaft 9 located at the bottom of the spherical valve core 12 is provided with a pointer 8, one end of the pointer 8 extends to the inside of the arc-shaped scale bar 7.

[0022] 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.

[0023] 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.

[0024] The achieved effect is that the bottom of the positioning plug plate 23 is in sliding fit with the top of the rack 18 when the rack 18 slides, when the pressure in the pipeline rises to the maximum passing pressure value of the valve, at this time, the opening of the ball valve element 12 and the opening degree between the two butt pipes 2 are in the maximum state, and at this time, the triangular port 20 on the rack 18 slides to the bottom of the positioning plug plate 23, and the positioning plug plate 23 is inserted into the triangular port 20 under the elastic force of the spring 26, so as to position the rack 18, prevent it from continuing to drive the transmission gear ring 17 and the ball valve element 12 to continue to rotate, and make the opening degree between the ball valve element 12 and the butt pipe 2 smaller. Before the positioning plug plate 23 is inserted into the triangular port 20, the metal core 29 on the insulating plate 27 is located above the two copper pads 28, when the plug plate 23 is inserted into the triangular port 20, the insulating plate 27 is driven to slide downward, at this time, the two ends of the metal core 29 correspond to each other and are in mutual fit with the two copper pads 28, so as to make the circuit conductive and turn on the external alarm lamp ring 10, thereby warning people that the pressure in the valve shell 1 has reached the maximum value, facilitating people to maintain and overhaul.

[0025] As shown in Figure 3 Figure 6 and Figure 9 The drainage assembly includes a bridge pipe 31, the top of the valve shell 1 is provided with a backflow hole 30, the backflow hole 30 is located inside the backflow pipe 4, the bridge pipe 31 is located inside the backflow hole 30, and the outer surface of the bridge pipe 31 is in sliding and sealing fit with the inner wall of the backflow hole 30, the inner top surface of the valve shell 1 is provided with an annular port 35, the annular port 35 is located outside the backflow hole 30, a plurality of first grid ports 36 penetrating into the backflow hole 30 are equally and circumferentially provided on the inner wall of the annular port 35 close to the top edge, a plurality of second grid ports 37 are equally and circumferentially provided on the outer surface of the bridge pipe 31 close to the bottom edge, the plurality of first grid ports 36 are in mutual communication with the second grid ports 37, the bottom of the bridge pipe 31 extends below the plurality of first grid ports 36, a side port 32 penetrating into the backflow hole 30 is provided on one side of the inner wall of the adjusting cavity 24, a connecting rod 33 is slidingly arranged between the inner walls of the side port 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.

[0026] The achieved effect is that when the positioning plug 23 is not inserted into the triangular port 20, the plurality of second grid ports 37 on the bridging pipe 31 are all located above the first grid port 36, and the first grid port 36 is closed by sliding sealing and fitting between the outer surface of the bridging pipe 31 and the inner wall of the backflow hole 30; when the positioning plug 23 is inserted into the triangular port 20 by sliding downward, the bridging pipe 31 is simultaneously driven to slide downward, at this time, the plurality of second grid ports 37 on the bridging pipe 31 slide to the opposite position of the first grid port 36, at this time, the second grid port 37 and the first grid port 36 are in communication with each other, the fluid in the valve housing 1 can enter the inside of the bridging pipe 31 through the second grid port 37 and the first grid port 36, and then be discharged from the backflow pipe 4, thereby preventing the pressure in the valve body 1 from continuing to rise, and preventing the pressure difference between the two ends of the valve from becoming large to cause the pipeline to vibrate.

[0027] Working principle: when using the device, the valve shell 1 is connected with the external pipeline through the butt joint pipe 2 at both ends, 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 in the sealing cavity 11, and it is not communicated with the butt joint pipe 2 at both ends of the valve shell 1. When the pipeline internal pressure rises after the valve shell 1 is butt jointed, the pressure in the pipeline will press the hollow rubber ring 13 towards the inner wall of the valve shell 1, and when the hollow rubber ring 13 is pressed, it will extrude the internal hydraulic oil to the inside of the oil cavity 15, and then push the piston 21 inside the oil cavity 15 to the transmission cavity 14 side, which will drive the rack 18 to slide, and then drive the transmission gear ring 17 to drive the spherical valve core 12 to rotate, so that the opening of the spherical valve core 12 is gradually opened between the two butt joint pipes 2, and the valve shell 1 is communicated. When the rack 18 slides, the bottom of the positioning plug plate 23 is in sliding fit with the top of the rack 18, and when the pressure in the pipeline rises to the maximum passing pressure value of the valve, the opening degree between the opening of the spherical valve core 12 and the two butt joint pipes 2 is the maximum, and at this time the triangular port 20 on the rack 18 slides to the bottom of the positioning plug plate 23, and under the elastic force of the spring 26, the positioning plug plate 23 is pressed downwards and inserted into the triangular port 20, so that the rack 18 is positioned, preventing it from continuing to drive the transmission gear ring 17 and the spherical valve core 12 to rotate, so that the opening degree between the spherical valve core 12 and the butt joint pipe 2 becomes smaller. When the positioning plug plate 23 slides downward, it will drive the insulating plate 27 to slide downward, at this time the two ends of the metal core 29 correspond to the two copper pads 28, which are in mutual fit, so that the circuit is communicated to turn on the external alarm lamp ring 10. When the positioning plug plate 23 is not inserted into the triangular port 20, the plurality of second grid ports 37 on the bridge pipe 31 are located above the first grid port 36, and the first grid port 36 is closed by the sliding sealing fit between the outer surface of the bridge pipe 31 and the inner wall of the backflow hole 30. When the positioning plug plate 23 slides downward and is inserted into the triangular port 20, it will simultaneously drive the bridge pipe 31 to slide downward, at this time the plurality of second grid ports 37 on the bridge pipe 31 slide to the opposite position of the first grid port 36, at this time the second grid port 37 and the first grid port 36 are in communication with each other, and the fluid inside the valve shell 1 can enter the bridge pipe 31 through the second grid port 37 and the first grid port 36, and then be discharged from the backflow pipe 4, preventing the internal pressure of the valve body 1 from continuing to rise, so that the pressure difference between the two ends of the valve becomes large, causing the pipeline to vibrate.

[0028] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-pressurized and self-cutoff ball valve, characterized in that, The utility model provides a valve, including valve shell (1), the inside of valve shell (1) is located in the middle and is opened with sealed cavity (11), the inner wall of sealed cavity (11) is sealed rotationally arranged with spherical valve core (12) in the middle, the middle part of spherical valve core (12) is through opening, the bottom of valve shell (1) is opened with indicating groove (6), the inside of valve shell (1) is located in sealed cavity (11) and is opened with transmission cavity (14), transmission cavity (14) is internally provided with transmission assembly, the inside of valve shell (1) is provided with drainage assembly, The top and bottom of spherical valve core (12) are fixed with rotating shaft (9), the rotating shaft (9) of spherical valve core (12) top is slid through to the inside of transmission cavity (14), the rotating shaft (9) of spherical valve core (12) bottom is slid through to the inside of indicating groove (6), the inside of valve shell (1) is provided with the limiting component of triggering drainage assembly work.

2. The self-pressure-controlling and self-cutting ball valve according to claim 1, wherein: The both ends of valve shell (1) are fixed with the butt joint pipe (2) communicated to the inside of sealed cavity (11), the outer surface of two butt joint pipe (2) is provided with sealing nut (3), the outer surface of valve shell (1) is fixed with alarm lamp ring (10) near one side edge, the top of valve shell (1) is fixed with backflow pipe (4), the top of valve shell (1) is opened with recess (5) on one side of backflow pipe (4).

3. The self-pressurized cutting ball valve according to claim 2, characterized in that: Transmission assembly includes hollow rubber ring (13), hollow rubber ring (13) is fixed between the inner wall of valve shell (1), and is close to the one side of sealed cavity (11), the inside of valve shell (1) is opened with oil cavity (15), one end of oil cavity (15) is opened with the bending flow channel (16) through to the inside of hollow rubber ring (13), the both sides inner wall of transmission cavity (14) is opened with guide groove (19) near rear side edge, one end of guide groove (19) is through to the other end of oil cavity (15).

4. The self-pressurized cutting ball valve according to claim 3, characterized in that: The inner wall of guide groove (19) is slid with rack (18), the inner wall of oil cavity (15) is slid with piston (21), one end of rack (18) is fixed on the one side of piston (21), the outer surface of piston (21) is provided with sealing ring (22) near both side edges, the outer surface of two sealing rings (22) is slid with the inner wall of oil cavity (15) and is sealed and is matched.

5. A self-pressurized cutting ball valve according to claim 4, characterized in that: The inside of transmission cavity (14) is provided with transmission gear ring (17), transmission gear ring (17) is intermeshed with rack (18), transmission gear ring (17) is fixed on the rotating shaft (9) of spherical valve core (12) top, the top of rack (18) is opened with triangular port (20) near the one side of piston (21), the inside bottom of indicating groove (6) is provided with arc scale bar (7) near one side, the rotating shaft (9) on the bottom of spherical valve core (12) is provided with pointer (8), one end of pointer (8) extends to the inside of arc scale bar (7).

6. A self-pressurized cutting ball valve according to claim 5, characterized in that: The limiting assembly comprises an insulating plate (27), an adjusting cavity (24) is arranged in the valve shell (1), the insulating plate (27) is slidably arranged between the inner walls of the adjusting cavity (24), a lifting rod (25) is fixed to the top of the insulating plate (27), the lifting rod (25) is slidably arranged in the recess (5), and a notch (34) is arranged on the outer surface of one side of the lifting rod (25) close to the top edge.

7. A self-pressurized cutting ball valve according to claim 6, characterized in that: A positioning plug (23) is fixed to the bottom of the insulating plate (27), the positioning plug (23) is slidably arranged in the guide groove (19), and the bottom of the positioning plug (23) is clamped in the triangular notch (20), a spring (26) is fixed to the top of the insulating plate (27), and the top of the spring (26) is fixed to the inner top surface of the adjusting cavity (24).

8. The self-pressurized cutting ball valve according to claim 7, characterized in that: A metal core (29) is arranged in the insulating plate (27), the metal core (29) is arranged on the outer surfaces of the two ends of the insulating plate (27), copper patches (28) are arranged on the inner walls of the two sides of the adjusting cavity (24) close to the bottom edges, the two copper patches (28) are electrically connected with the alarm lamp ring (10), and the two ends of the metal core (29) are respectively attached to the outer surfaces of the copper patches (28).

9. The self-pressurized cutting ball valve according to claim 8, characterized in that: The drainage assembly comprises a bridging pipe (31), a backflow hole (30) is arranged in the top of the valve shell (1), the backflow hole (30) is arranged on the inner side of the backflow pipe (4), the bridging pipe (31) is arranged in the backflow hole (30), and the outer surface of the bridging pipe (31) is slidably and sealingly attached to the inner wall of the backflow hole (30), and an annular notch (35) is arranged in the inner top surface of the valve shell (1).

10. The self-pressurizing and self-cutting ball valve according to claim 9, wherein: The annular notch (35) is arranged on the outer side of the backflow hole (30), a plurality of first grid notches (36) are equidistantly arranged on the inner wall of the annular notch (35) close to the top edge and penetrating into the backflow hole (30) in the circumferential direction, a plurality of second grid notches (37) are equidistantly arranged on the outer surface of the bridging pipe (31) close to the bottom edge in the circumferential direction, the plurality of first grid notches (36) are respectively communicated with the second grid notches (37), the bottom of the bridging pipe (31) extends below the plurality of first grid notches (36), a side notch (32) is arranged in the side wall of the adjusting cavity (24) and penetrating into the backflow hole (30), and a connecting rod (33) is slidably arranged between the two inner walls of the side notch (32), one end of the connecting rod (33) is fixed to the outer surface of the bridging pipe (31), and the other end of the connecting rod (33) is fixed to the outer surface of the insulating plate (27).

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