Leak-proof stop valve

Abstract

The application discloses a leakproof stop valve and relates to the technical field of stop valves. The leakproof stop valve comprises a shell, a valve body is arranged in the shell, a valve cover is arranged on the valve body, a sealing piece is arranged on the valve cover, a pressure regulating assembly is arranged on the valve body, the pressure regulating assembly and a control part are connected through a linkage, a protection piece is arranged on the valve body, a mounting seat is arranged on the valve cover, a sealing shell is arranged on the mounting seat, a sealing air bag is arranged in the sealing shell, an air inlet valve is arranged on the sealing air bag, and a gas supply air bag is connected to the air inlet valve. The air inlet valve is used for filling a certain pressure gas into the sealing air bag, so that the sealing air bag wraps around a valve rod. The ductility of the sealing air bag can ensure that possible leakage points between the valve rod and a sliding hole are filled, hard sealing and soft sealing of the sealing shell and the sealing air bag are double matched, and the sealing effect is improved.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically a leak-proof gate valve. Background Technology

[0002] Gate valves are control components commonly used in fluid transport pipeline systems for shut-off and flow regulation, and are widely used in water supply and drainage, petrochemical, municipal pipe networks, and industrial fluid transport.

[0003] Currently, gate valves generally suffer from three types of defects: First, the valve stem often uses a single packing seal structure, which is prone to seal failure after long-term reciprocating wear, leading to media leakage; second, the valve opening is mostly fixed or manually adjustable, and when the inlet pressure fluctuates significantly, it cannot adaptively adjust the flow area, which easily causes unstable outlet pressure and flow; third, they lack water hammer protection structures, and sudden water hammer effects in pipelines can generate instantaneous high-pressure impacts, causing damage to the valve body and pipeline rupture, significantly shortening the valve's service life. Summary of the Invention

[0004] The purpose of this invention is to provide a leak-proof shut-off valve to solve the problems of poor sealing, inability to self-adjust, and lack of water hammer protection structure in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The leak-proof shut-off valve includes a housing, a valve body installed inside the housing, an inlet end and an outlet end at the two ends of the valve body, a valve disc slidably installed inside the valve body, a valve cover installed on the valve body, a sliding hole opened on the valve cover, a valve stem installed on the valve disc, the valve stem passing through the sliding hole, a control part provided at the end of the valve stem, a sealing element provided on the valve cover, a pressure regulating component provided on the valve body, the pressure regulating component and the control part being connected by a linkage, and a protective element provided on the valve body; The sealing element includes a mounting base, a sealing shell, a sealing airbag, an air intake valve, and an air supply airbag; A mounting base is installed on the valve cover, a sealing shell is installed on the mounting base, a sealing airbag is installed inside the sealing shell, the valve stem passes through the sealing airbag, an air inlet valve is installed on the sealing airbag, and an air supply airbag is connected to the outside of the air inlet valve.

[0006] When in use, the height of the valve disc can be adjusted by rotating the control unit, thereby controlling the opening degree of the valve. Gas of a certain pressure is injected into the sealing bladder through the air inlet valve, so that the sealing bladder wraps around the valve stem, realizing the dual cooperation of hard and soft sealing between the sealing shell and the sealing bladder, improving the sealing effect. The extensibility of the sealing bladder can ensure that all possible leakage points between the valve stem and the sliding hole are filled. The sealing shell provides support for the sealing bladder. The two work together to improve the sealing effect and prevent material leakage. The pressure regulating components and linkages can adjust the opening degree in real time according to the inlet pressure to achieve the function of pressure reduction and flow stabilization, which can protect the valve body and control the flow.

[0007] Protective components can reduce the damage to the valve body caused by water hammer and replenish the air pressure of the sealing airbag, thus extending the service life of the equipment.

[0008] As a preferred technical solution, the control unit includes a rotating block and a mating hole. The upper part of the valve stem is provided with a thread, and the rotating block is rotatably mounted on the outer shell. The rotating block has a mating hole, which is threaded with the valve stem. The threaded part of the valve stem is always inside the mating hole. Rotating the rotating block causes the valve stem to move the valve disc up and down through the threaded engagement. The threaded surface of the valve stem is always inside the mating hole and does not enter the sealing airbag, thus avoiding damage to the sealing airbag by the threads and ensuring sealing performance.

[0009] As a preferred technical solution, the pressure regulating assembly includes a throttling plate, a throttling orifice, an adjusting groove, an adjusting plate, an adjusting rod, a mounting plate, an internally threaded rod, and an adjuster; A throttling plate is installed on the side of the valve body near the inlet end. The throttling plate has a throttling orifice and an adjusting groove. An adjusting plate is slidably installed in the adjusting groove. An adjusting rod is installed on the adjusting plate. An mounting plate is installed on the valve body. An internally threaded rod is rotatably installed on the mounting plate. The adjusting rod extends into the internally threaded rod and is threadedly engaged with the internally threaded rod. An adjuster is installed at the upper end of the internally threaded rod. When the material enters the valve body, it will first pass through the throttling orifice. The diameter of the throttling orifice is smaller than the diameter of the valve body. According to Bernoulli's principle, when the material passes through an orifice that suddenly becomes smaller, the velocity will increase sharply and the pressure will drop significantly. This can reduce the pressure and control the flow rate, buffer the impact, and protect the valve disc. The regulator can be rotated, which drives the internal threaded rod to rotate. Through the threaded engagement, the regulating rod moves the regulating plate up and down, adjusting the effective area of ​​the throttling orifice to achieve different pressure reduction and control purposes.

[0010] As a preferred technical solution, the pressure regulating assembly further includes a connecting ring, a first bidirectional overrunning clutch, and a pressure gauge; A connecting ring is installed on the outside of the internal threaded rod. A first bidirectional overrunning clutch is installed on the mounting plate. The outer ring of the first bidirectional overrunning clutch is connected to the linkage component. The inner ring of the first bidirectional overrunning clutch is connected to the connecting ring. A pressure gauge is installed on the side of the throttle plate near the inlet end. The linkage component is electrically connected to the pressure gauge.

[0011] As a preferred technical solution, the linkage includes a motor frame, a micro motor, a first transmission wheel, a second transmission wheel, a first transmission chain, a second transmission chain, and a second bidirectional overrunning clutch; A motor frame is mounted on the mounting plate, and a micro motor is mounted on the motor frame. The micro motor is a dual-axis motor. A first transmission wheel is mounted on one output shaft of the micro motor. The first transmission wheel is connected to a first bidirectional overrunning clutch via a first transmission chain. A second transmission wheel is mounted on the other output shaft of the micro motor. A second bidirectional overrunning clutch is mounted on the rotating block. The second transmission wheel is connected to the second bidirectional overrunning clutch via a second transmission chain.

[0012] As a preferred technical solution, distance sensors are installed at both the end of the mating hole and the end of the internal threaded rod. A control panel is provided on the housing. The distance sensors are electrically connected to the control panel. The two distance sensors detect the position of the adjusting plate and the position of the valve disc, respectively, to determine the size of the effective area of ​​the throttling orifice and the opening degree of the valve, so as to facilitate the worker to observe the working status of the valve in real time and use it as an adjustment reference.

[0013] As a preferred technical solution, the protective component includes a pressure relief hole, a mounting cylinder, a pressure relief airbag, and a pressure relief pipe; The valve body has a pressure relief hole located between the throttling plate and the valve disc. An installation cylinder is installed outside the pressure relief hole, and a pressure relief airbag is installed inside the installation cylinder. The pressure relief airbag is connected to the air supply airbag through a pressure relief pipe.

[0014] As a preferred technical solution, the intake valve is a pilot-operated normally open one-way valve.

[0015] As a preferred technical solution, the bottom of the outer shell is wedge-shaped, and a drain hole is provided at the bottom of the wedge. A flow meter is installed on the drain hole, and the flow meter is electrically connected to the control panel. When there is a leak in the valve body, the leakage will flow through the wedge to the drain hole and be discharged through the flow meter. The flow meter will detect the leakage rate and feed the data back to the control panel in real time, so that the staff can observe and detect it in time. The bottom of the wedge shape ensures that the leak can be detected in time.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The valve stem is sealed by combining a sealing airbag and a sealing shell, which improves the sealing fit and enhances the sealing effect.

[0017] 2. Through the pressure regulating component and protective components, adaptive pressure reduction and flow stabilization are achieved, eliminating the need for an additional pressure reducing valve and effectively protecting the valve body.

[0018] 3. Protective components are installed to absorb the impact force generated by water hammer, improve sealing, protect the equipment, and extend its service life. Attached Figure Description

[0019] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the structure of the present invention without a shell from a second perspective; Figure 6 This is a schematic diagram of the cross-sectional structure of the shell-less version of the present invention; Figure 7 This is a schematic diagram of the first partial cross-sectional structure of the present invention; Figure 8 This is a schematic diagram of the second partial cross-sectional structure of the present invention.

[0020] In the diagram: 1. Outer shell; 2. Valve body; 3. Inlet end; 4. Outlet end; 5. Valve disc; 6. Valve cover; 7. Slide hole; 8. Valve stem; 9. Control unit; 901. Rotary block; 902. Mating hole; 10. Seal; 1001. Mounting base; 1002. Sealing shell; 1003. Sealing airbag; 1004. Inlet valve; 1005. Supply airbag; 11. Pressure regulating assembly; 1101. Throttling plate; 1102. Throttling orifice; 1103. Adjusting groove; 1104. Adjusting plate; 1105. Adjusting rod; 1106. Mounting plate; 1107. Internally threaded rod; 1108. Connecting ring; 1109. First bidirectional overrunning clutch; 1110. Pressure gauge; 1111. Regulator; 12. Linkage component; 1201. Motor frame; 1202. Micro motor; 1203. First transmission wheel; 1204. Second transmission wheel; 1205. First transmission chain; 1206. Second transmission chain; 1207. Second bidirectional overrunning clutch; 13. Protective components; 1301. Pressure relief hole; 1302. Mounting cylinder; 1303. Pressure relief airbag; 1304. Pressure relief pipe; 14. Distance sensor; 15. Control panel; 16. Wedge; 17. Drain hole; 18. Flow meter. Detailed Implementation

[0021] 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.

[0022] Example: Figures 1-8 As shown, the present invention provides a leak-proof gate valve technical solution. The leak-proof gate valve includes a shell 1, a valve body 2 installed inside the shell 1, an inlet end 3 and an outlet end 4 at the two ends of the valve body 2 respectively, a valve disc 5 slidably installed inside the valve body 2, a valve cover 6 installed on the valve body 2, a sliding hole 7 opened on the valve cover 6, a valve stem 8 installed on the valve disc 5, the valve stem 8 passing through the sliding hole 7, a control part 9 provided at the end of the valve stem 8, a sealing element 10 provided on the valve cover 6, a pressure regulating component 11 provided on the valve body 2, the pressure regulating component 11 and the control part 9 being connected by a linkage 12, and a protective element 13 provided on the valve body 2. The sealing element 10 includes a mounting base 1001, a sealing shell 1002, a sealing airbag 1003, an air intake valve 1004, and an air supply airbag 1005; A mounting base 1001 is installed on the valve cover 6. A sealing shell 1002 is installed on the mounting base 1001. A sealing airbag 1003 is installed inside the sealing shell 1002. The valve stem 8 passes through the sealing airbag 1003. An air inlet valve 1004 is installed on the sealing airbag 1003. An air supply airbag 1005 is connected to the outside of the air inlet valve 1004.

[0023] When in use, the height of the valve disc 5 can be adjusted by rotating the control unit 9, thereby controlling the opening degree of the valve. Gas of a certain pressure is injected into the sealing airbag 1003 through the air inlet valve 1004, so that the sealing airbag 1003 wraps the valve stem 8, realizing the dual cooperation of hard sealing and soft sealing between the sealing shell 1002 and the sealing airbag 1003, improving the sealing effect. The extensibility of the sealing airbag 1003 can ensure that all possible leakage points between the valve stem 8 and the sliding hole 7 are filled. The sealing shell 1002 provides support for the sealing airbag 1003. The two work together to improve the sealing effect and prevent material leakage. The pressure regulating component 11 and the linkage component 12 can adjust the opening degree in real time according to the inlet pressure to achieve the function of pressure reduction and flow stabilization, which can protect the valve body and control the flow.

[0024] The protective component 13 can reduce the damage of water hammer effect to the valve body 2 and replenish the air pressure of the sealing airbag 1003, thus extending the service life of the equipment.

[0025] The control unit 9 includes a rotating block 901 and a mating hole 902. The upper part of the valve stem 8 is provided with a thread. The rotating block 901 is rotatably mounted on the outer casing 1. The rotating block 901 is provided with a mating hole 902, which is threadedly engaged with the valve stem 8.

[0026] The threaded portion of the valve stem 8 is always within the mating hole 902. Rotating the rotating block 901 causes the valve stem 8 to move the valve disc 5 up and down through the threaded engagement. The threaded surface of the valve stem 8 is always within the mating hole 902 and does not enter the sealing air bladder, thus avoiding damage to the sealing air bladder 1003 by the threads and ensuring sealing performance.

[0027] The pressure regulating assembly 11 includes a throttle plate 1101, a throttle orifice 1102, an adjusting groove 1103, an adjusting plate 1104, an adjusting rod 1105, a mounting plate 1106, an internally threaded rod 1107, and an regulator 1111; A throttling plate 1101 is installed on the side of the valve body 2 near the inlet end 3. The throttling plate 1101 has a throttling orifice 1102 and an adjusting groove 1103. An adjusting plate 1104 is slidably installed in the adjusting groove 1103. An adjusting rod 1105 is installed on the adjusting plate 1104. An mounting plate 1106 is installed on the valve body 2. An internally threaded rod 1107 is rotatably installed on the mounting plate 1106. The adjusting rod 1105 extends into the internally threaded rod 1107 and is threadedly engaged with the internally threaded rod 1107. An adjuster 1111 is installed on the upper end of the internally threaded rod 1107.

[0028] When the material enters the valve body 2, it will first pass through the throttling orifice 1102. The diameter of the throttling orifice 1102 is smaller than the pipe diameter of the valve body 2. According to Bernoulli's principle, when the material passes through an orifice that suddenly becomes smaller, the speed will increase sharply and the pressure will drop significantly. This can reduce the pressure and control the flow rate, buffer the impact, and protect the valve disc 5. The regulator 1111 can be rotated, which drives the internal thread rod 1107 to rotate. Through the threaded engagement, the regulating rod 1105 drives the regulating plate 1104 to move up and down, thereby adjusting the effective area of ​​the throttling orifice 1102 and achieving different pressure reduction and control purposes.

[0029] The pressure regulating assembly 11 also includes a connecting ring 1108, a first bidirectional overrunning clutch 1109, and a pressure gauge 1110; A connecting ring 1108 is installed on the outside of the internal threaded rod 1107. A first bidirectional overrunning clutch 1109 is installed on the mounting plate 1106. The outer ring of the first bidirectional overrunning clutch 1109 is connected to the linkage 12, and the inner ring of the first bidirectional overrunning clutch 1109 is connected to the connecting ring 1108. A pressure gauge 1110 is installed on the side of the throttle plate 1101 near the inlet end 3. The linkage 12 is electrically connected to the pressure gauge 1110.

[0030] Before the material is input, the initial effective area of ​​the throttling orifice 1102 is manually adjusted. During use, the pressure gauge 1110 detects the inlet pressure in real time. When the inlet pressure is too high, in order to maintain the flow rate, the linkage 12 will drive the connecting ring 1108 clevis internal thread rod 1107 to rotate through the first bidirectional overrunning clutch 1109, so that the adjusting plate 1104 moves down, reducing the effective area of ​​the throttling orifice 1102, ensuring the material conveying volume per unit time, and realizing adaptive pressure reduction and stable flow.

[0031] The linkage 12 includes a motor frame 1201, a micro motor 1202, a first transmission wheel 1203, a second transmission wheel 1204, a first transmission chain 1205, a second transmission chain 1206, and a second bidirectional overrunning clutch 1207. A motor frame 1201 is mounted on the mounting plate 1106. A micro motor 1202 is mounted on the motor frame 1201. The micro motor 1202 is a dual-axis motor. A first transmission wheel 1203 is mounted on one output shaft of the micro motor 1202. The first transmission wheel 1203 is connected to a first bidirectional overrunning clutch 1109 through a first transmission chain 1205. A second transmission wheel 1204 is mounted on the other output shaft of the micro motor 1202. A second bidirectional overrunning clutch 1207 is mounted on the rotating block 901. The second transmission wheel 1204 is connected to the second bidirectional overrunning clutch 1207 through a second transmission chain 1206.

[0032] When the inlet pressure of this valve increases sharply during operation, the excessive pressure will damage the throttling plate 1101 and cause flow blockage in the continuously shrinking throttling orifice 1102, thus rendering the throttling function ineffective. At this time, the electrical signal emitted by the pressure gauge 1110 controls the linkage 12 to drive the effective area of ​​the throttling orifice 1102 to increase, ensuring the normal passage of materials. Simultaneously, when the linkage 12 drives the effective area of ​​the throttling orifice 1102 to increase, it synchronously drives the valve disc 5 to move upward, increasing the valve opening and reducing the damage of high pressure to the valve. This allows the valve to have the function of adaptively adjusting the opening while stabilizing the flow, reducing losses and extending the service life of the equipment. When the micro motor 1202 receives a signal to start, it will drive the first transmission wheel 1203 and the second transmission wheel 1204 to rotate synchronously. The first transmission wheel 1203 and the second transmission wheel 1204 adjust the opening of the valve with the effective area of ​​the throttle orifice 1102 through the first transmission chain 1205 and the second transmission chain 1206 respectively, so as to achieve adaptive adjustment. The use of a two-way overrunning clutch ensures that when manually adjusting the effective area of ​​the throttle orifice 1102 and the valve opening, the power will not be transmitted back along the linkage 12, and the adjustment of the throttle orifice 1102 and the opening and closing of the main valve of the valve disc 5 will not affect each other during the initial manual adjustment stage.

[0033] Distance sensors 14 are installed at the end of the mating hole 902 and the end of the internal thread rod 1107. A control panel 15 is provided on the housing 1, and the distance sensors 14 are electrically connected to the control panel 15.

[0034] Two distance sensors 14 detect the position of the regulating plate 1104 and the valve disc 5 respectively, thereby determining the size of the effective area of ​​the throttle orifice 1102 and the opening degree of the valve, so that workers can observe the working status of the valve in real time and use it as an adjustment reference.

[0035] The protective component 13 includes a pressure relief hole 1301, a mounting cylinder 1302, a pressure relief airbag 1303, and a pressure relief pipe 1304; A pressure relief hole 1301 is provided on the valve body 2. The pressure relief hole 1301 is located between the throttle plate 1101 and the valve disc 5. An installation cylinder 1302 is installed outside the pressure relief hole 1301. A pressure relief airbag 1303 is installed inside the installation cylinder 1302. The pressure relief airbag 1303 is connected to the air supply airbag 1005 through a pressure relief pipe 1304.

[0036] When the worker lowers the valve disc 5 and closes the flow channel, an impact force is generated due to the water hammer effect. The impact force is generated at the valve disc 5 and propagates to the throttling plate 1101. When the impact force propagates to the pressure relief hole 1301, the pressure is propagated outward through the water flow, squeezing the pressure relief airbag 1303 and converting the impact force into air pressure. When the water pressure returns to normal, the air pressure will push the pressure relief airbag 1303 to recover, and it can absorb the impact force again, reducing the damage of the water hammer effect to the valve body 2. Meanwhile, the pressure relief airbag 1303 is connected to the air supply airbag 1005. By increasing the gas capacity, the pressure relief range is expanded, and it can withstand a greater impact force caused by the water hammer effect.

[0037] The intake valve 1004 is a pilot-operated normally open check valve.

[0038] The pilot-operated normally open check valve allows compressed gas in the pressure relief bladder 1303 to enter the sealing bladder 1003 to replenish air when the air pressure inside the sealing bladder 1003 decreases, ensuring a tight seal. When the air pressure inside the sealing bladder 1003 is sufficient, gas in the pressure relief bladder 1303 will not enter, preventing excessively high air pressure inside the sealing bladder 1003 from affecting the normal movement of the valve stem 8.

[0039] The bottom of the outer casing 1 is wedge-shaped 16, and a drain hole 17 is provided at the bottom of the wedge 16. A flow meter 18 is installed on the drain hole 17, and the flow meter 18 is electrically connected to the control panel 15.

[0040] When there is a leak in valve body 2, the liquid will flow through wedge 16 to drain hole 17 and then through flow meter 18. Flow meter 18 will detect the leakage rate and feed the data back to control panel 15 in real time, so that staff can observe and detect it in time. The bottom surface of wedge 16 ensures that the leak can be detected in time.

[0041] Working principle of the invention: Before use, the valve is manually adjusted by the regulator 1111 and the rotary block 901 to determine the initial effective area of ​​the throttling orifice 1102 and the valve opening degree. The maximum inlet pressure threshold is set on the control panel 15. Then, when the pressure gauge 1110 feeds back the detection result to the control panel 15, and the inlet pressure increases, the control panel 15 controls the regulating plate 1104 to reduce the effective area of ​​the throttling orifice 1102 and simultaneously controls the valve disc 5 to move down, so as to achieve adaptive pressure reduction and flow stabilization. No additional pressure reducing valve is required, which effectively protects the valve body 2. According to the preset maximum inlet pressure threshold, when the inlet pressure exceeds the threshold, continuing to reduce the effective area of ​​the throttle orifice 1102 will cause damage to the valve body 2 and failure of the throttle orifice 1102. At this time, it is necessary to increase the effective area of ​​the throttle orifice 1102 according to the pressure to protect the valve body 2. At the same time, the control panel 15 will issue a warning to remind the staff.

[0042] The valve stem 8 is sealed by combining the sealing airbag 1003 and the sealing shell 1002, thereby improving the sealing fit and enhancing the sealing effect.

[0043] The protective component 13 can absorb the impact force generated by the water hammer effect through the pressure relief airbag 1303. At the same time, the high pressure gas generated by the compression of the pressure relief airbag 1303 can replenish the gas in the sealing airbag 1003, further ensuring the sealing performance of the valve body 2, reducing the maintenance frequency, and extending the service life.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A leak-proof shut-off valve, characterized in that: The leak-proof shut-off valve includes a housing (1), a valve body (2) installed inside the housing (1), an inlet end (3) and an outlet end (4) at both ends of the valve body (2), a valve disc (5) slidably installed inside the valve body (2), a valve cover (6) installed on the valve body (2), a sliding hole (7) opened on the valve cover (6), a valve stem (8) installed on the valve disc (5), the valve stem (8) passing through the sliding hole (7), a control part (9) provided at the end of the valve stem (8), a sealing element (10) provided on the valve cover (6), a pressure regulating component (11) provided on the valve body (2), the pressure regulating component (11) and the control part (9) connected by a linkage (12), and a protective element (13) provided on the valve body (2). The sealing element (10) includes a mounting base (1001), a sealing shell (1002), a sealing airbag (1003), an air inlet valve (1004), and an air supply airbag (1005). A mounting base (1001) is installed on the valve cover (6), a sealing shell (1002) is installed on the mounting base (1001), a sealing airbag (1003) is installed inside the sealing shell (1002), the valve stem (8) passes through the sealing airbag (1003), an air intake valve (1004) is installed on the sealing airbag (1003), and an air supply airbag (1005) is connected to the outside of the air intake valve (1004). The control unit (9) includes a rotating block (901) and a mating hole (902). The upper part of the valve stem (8) is provided with a thread. The rotating block (901) is rotatably mounted on the outer shell (1). The rotating block (901) is provided with a mating hole (902). The mating hole (902) is threadedly engaged with the valve stem (8). The pressure regulating assembly (11) includes a mounting plate (1106), a throttle plate (1101), and an internal thread rod (1107). The mounting plate (1106) is mounted on the valve body (2), and the internal thread rod (1107) is rotatably mounted on the mounting plate (1106). The throttle plate (1101) is mounted on the side of the valve body (2) near the inlet end (3). The pressure regulating assembly (11) also includes a connecting ring (1108), a first bidirectional overrunning clutch (1109), and a pressure gauge (1110). A connecting ring (1108) is installed on the outside of the internal threaded rod (1107). A first bidirectional overrunning clutch (1109) is installed on the mounting plate (1106). The outer ring of the first bidirectional overrunning clutch (1109) is connected to the linkage (12). The inner ring of the first bidirectional overrunning clutch (1109) is connected to the connecting ring (1108). A pressure gauge (1110) is installed on the side of the throttle plate (1101) near the inlet end (3). The linkage (12) is electrically connected to the pressure gauge (1110). The linkage component (12) includes a motor frame (1201), a micro motor (1202), a first transmission wheel (1203), a second transmission wheel (1204), a first transmission chain (1205), a second transmission chain (1206), and a second bidirectional overrunning clutch (1207). A motor frame (1201) is mounted on the mounting plate (1106), and a micro motor (1202) is mounted on the motor frame (1201). The micro motor (1202) is a dual-axis motor. A first transmission wheel (1203) is mounted on one output shaft of the micro motor (1202). The first transmission wheel (1203) is connected to a first bidirectional overrunning clutch (1109) through a first transmission chain (1205). A second transmission wheel (1204) is mounted on the other output shaft of the micro motor (1202). A second bidirectional overrunning clutch (1207) is mounted on the rotating block (901). The second transmission wheel (1204) is connected to the second bidirectional overrunning clutch (1207) through a second transmission chain (1206).

2. The leak-proof shut-off valve according to claim 1, characterized in that: The pressure regulating assembly (11) includes a throttle orifice (1102), an regulating groove (1103), an regulating plate (1104), an regulating rod (1105), and a regulator (1111). The throttling plate (1101) is provided with a throttling hole (1102) and an adjusting groove (1103). An adjusting plate (1104) is slidably installed in the adjusting groove (1103). An adjusting rod (1105) is installed on the adjusting plate (1104). The adjusting rod (1105) extends into the internal thread rod (1107) and is threadedly engaged with the internal thread rod (1107). An adjuster (1111) is installed at the upper end of the internal thread rod (1107).

3. The leak-proof shut-off valve according to claim 2, characterized in that: Distance sensors (14) are installed at the end of the mating hole (902) and the end of the internal thread rod (1107). A control panel (15) is provided on the housing (1). The distance sensors (14) are electrically connected to the control panel (15).

4. A leak-proof shut-off valve according to claim 3, characterized in that: The protective component (13) includes a pressure relief hole (1301), a mounting cylinder (1302), a pressure relief airbag (1303), and a pressure relief pipe (1304). A pressure relief hole (1301) is provided on the valve body (2). The pressure relief hole (1301) is located between the throttle plate (1101) and the valve disc (5). An installation cylinder (1302) is installed outside the pressure relief hole (1301). A pressure relief airbag (1303) is installed inside the installation cylinder (1302). The pressure relief airbag (1303) is connected to the air supply airbag (1005) through a pressure relief pipe (1304).

5. A leak-proof shut-off valve according to claim 3, characterized in that: The intake valve (1004) is a pilot-operated normally open check valve.

6. A leak-proof shut-off valve according to claim 3, characterized in that: The bottom of the outer casing (1) is wedge-shaped (16), and a drain hole (17) is provided at the bottom of the wedge (16). A flow meter (18) is installed on the drain hole (17), and the flow meter (18) is electrically connected to the control panel (15).

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