Stop valve for gas pressure regulator

Abstract

The invention belongs to the technical field of stop valves, and particularly relates to a stop valve for a gas pressure regulator, which comprises a valve body, a valve seat is arranged in the valve body, the valve body is divided into a high-pressure cavity and a low-pressure cavity through the valve seat, a pressure regulating component is arranged at the top end of the low-pressure cavity, the pressure regulating component is communicated with the low-pressure cavity through a pipeline, and a valve rod is connected to the middle of the pressure regulating component. The valve rod penetrates through the valve seat and is connected with a second valve clack, a cut-off executing mechanism is arranged in the low-pressure cavity, a pressure-bearing triggering mechanism is arranged on one side of the low-pressure cavity, the pressure-bearing triggering mechanism is communicated with the low-pressure cavity, and the pressure-bearing triggering mechanism and the cut-off executing mechanism are in transmission fit through a linkage assembly. The pressure-bearing triggering mechanism triggers the cut-off executing mechanism to execute actions through the linkage assembly and blocks the valve seat. The mechanical pressure sensing and execution integrated design is adopted, so that remarkable technical progress and engineering application value are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cut-off valves, and in particular relates to a cut-off valve for a gas pressure regulator. Background Art

[0002] Gas pressure regulators, also known as pressure reducing valves, are core pressure control devices in gas transmission and distribution systems. They operate by automatically adjusting the valve opening to dynamically adjust gas flow, thereby stabilizing outlet gas pressure within a set safety range. This device plays an irreplaceable role in urban gas pipelines and industrial gas supply scenarios.

[0003] There are two typical risks during the operation of the equipment: First, when the key components inside the pressure regulator (such as valve seals, spring assemblies or diaphragms, etc.) are worn, aged or mechanically malfunction, its pressure regulation function will fail, causing the outlet pressure to continue to rise uncontrollably; second, due to the fluctuation of downstream gas load, the outlet pressure of the pressure regulator may experience periodic pressure oscillations. If these two abnormal operating conditions are not intervened in time, they may cause the pipeline to operate at overpressure, resulting in major safety hazards such as leakage of connectors, damage to equipment and even explosion. In order to build a dual safety protection system, the current technical solutions usually adopt two cut-off protection strategies: first, integrating a self-protection cut-off device into the pressure regulator body; second, adding an independent cut-off valve group to the downstream transmission and distribution pipeline network. However, the existing method of integrating the cut-off valve into the cut-off device is relatively complex in structure and has a high failure rate.

[0004] Therefore, it is necessary to propose a shut-off valve for a gas pressure regulator to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a shut-off valve for a gas pressure regulator to solve the above-mentioned problems in the prior art.

[0006] To achieve the above-mentioned objectives, the present invention provides a shut-off valve for a gas pressure regulator, comprising a valve body, a valve seat being provided in the valve body, the valve body being divided into a high-pressure chamber and a low-pressure chamber by the valve seat, a pressure-regulating assembly being provided at the top of the low-pressure chamber, the pressure-regulating assembly being connected to the low-pressure chamber through a pipeline, a valve stem being connected to the middle part of the pressure-regulating assembly, the valve stem passing through the valve seat and being connected to a valve disc 2, a shut-off actuator being provided in the low-pressure chamber, a pressure-bearing trigger mechanism being provided on one side of the low-pressure chamber, the pressure-bearing trigger mechanism being connected to the low-pressure chamber, the pressure-bearing trigger mechanism and the shut-off actuator being transmitted and coordinated through a linkage assembly, and when the pressure in the low-pressure chamber reaches the starting condition of the pressure-bearing trigger mechanism, the pressure-bearing trigger mechanism triggers the shut-off actuator to perform an action through the linkage assembly and seals the valve seat.

[0007] Optimized, the pressure regulating assembly includes a shell 2 at the top of the low-pressure chamber, a diaphragm 1 is provided in the shell 2, the shell 2 is divided into an upper chamber and a lower chamber by the diaphragm 1, the lower chamber is connected to the low-pressure chamber through a pipeline, trays are provided on both sides of the diaphragm 1, the top of the valve stem passes through the bottom wall of the shell 2 and is connected to the tray, the middle part of the top of the shell 2 is connected to a tube body, a spring 1 is provided in the tube body, the bottom end of the spring 1 abuts against the tray, the top of the spring 1 abuts against a pressure regulating part, and the pressure regulating part is provided at the top of the tube body.

[0008] Optimally, the pressure regulating member includes an adjusting bolt threadedly connected to the top end of the tube body, a ball is embedded in the bottom end of the adjusting bolt, the top end of the spring 1 is connected to a top plate, and the ball is in sliding contact with the top plate.

[0009] Optimized, the cut-off actuator includes a spring seat 1 fixedly connected to the top of the low-pressure chamber, a guide tube is slidably sleeved on the valve stem, the top of the guide tube is connected to the spring seat 1, a spring 2 and a pressure plate are slidably provided on the guide tube from top to bottom, the top of the spring 2 is fixed on the spring seat 1, the bottom end of the spring 2 is fixedly connected to the pressure plate, and the bottom end of the pressure plate is connected to a valve disc 1.

[0010] Optimally, the pressure-bearing trigger mechanism includes a protective shell 2, a pressure-bearing component is provided at the top end of the protective shell 2, and a pressure-bearing adjusting member is provided at the bottom end of the protective shell 2, and the pressure-bearing adjusting member is used to adjust the pressure that the pressure-bearing component can withstand.

[0011] Optimized, the pressure-bearing component includes a shell one fixedly arranged at the top end of the protective shell two, a membrane two is arranged inside the shell one, the shell one is divided into an upper chamber and a lower chamber by the membrane two, the upper chamber is connected to the low-pressure chamber through a conduit, the bottom end of the membrane two is connected to a support plate, the support plate is located in the lower chamber, the bottom end of the support plate is fixedly connected to a connecting rod, the connecting rod passes through the bottom wall of the shell one and is connected to the pressure-bearing adjusting member.

[0012] Optimized, the pressure-bearing adjusting member includes a protective shell 1 connected to the bottom end of the shell 1, the bottom end of the protective shell 1 is threadedly connected to a spring seat 2, the spring seat 2 is an annular structure, a fixed tube is slidably connected inside the spring seat 2, the top end of the fixed tube is connected to the bottom end of the connecting rod, a spring 3 is sleeved on the fixed tube, the bottom end of the spring 3 abuts against the spring seat 2, and the spring 3 abuts against the flange on the fixed tube.

[0013] The cam is fixedly mounted on the support frame, and the support frame is rotatably connected to the reset wheel. The connecting rod is fixedly sleeved with a limiting tube, and the limiting tube is provided with an annular groove. The rotating shaft is provided with a torsion spring, and the reset wheel abuts against the annular groove through the torsion spring. The protective shell is rotated to connect the lock plate on one side away from the rotating shaft, and the tip of the lock plate abuts against the rotating shaft through the torsion spring. A notch is provided on the side of the rotating shaft close to the tip of the lock plate. When the rotating shaft is rotated, the tip of the lock plate disengages from the rotating shaft through the notch. The lock plate is provided with a U-shaped notch, and a linkage part is buckled in the U-shaped notch, and the linkage part is connected to a positioning shaft, and the positioning shaft is rotatably connected to the protective shell second. One end of the positioning shaft is connected to a limiting block, and the limiting block is limited by the pressure plate, and the positioning shaft extends out of the protective shell second and is connected to the handle.

[0014] Optimally, the linkage member includes a linkage piece fixedly sleeved on the positioning shaft, a positioning edge of the linkage piece is connected to a locking rod, and the locking rod is limitedly fitted in the U-shaped notch.

[0015] Optimally, a manual button is provided on the second protective shell, and the manual button is used to drive the rotating shaft to rotate.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The present invention provides a shut-off valve for a gas pressure regulator, which drives the valve stem to move up and down according to the pressure adaptability of the low-pressure chamber through a pressure-regulating component. When the pressure in the low-pressure chamber is too high, the pressure-regulating component drives the valve stem to move upward, so that the valve flap 2 is close to the valve seat and the opening is reduced, thereby reducing the pressure in the low-pressure chamber. Conversely, when the low-pressure chamber is too low, the pressure-regulating component drives the valve stem to move downward, so that the valve flap 2 is away from the valve seat and the opening is increased, thereby increasing the pressure in the low-pressure chamber 15. When the pressure-regulating component fails, the pressure in the low-pressure chamber increases, and the pressure-bearing trigger mechanism provided drives the linkage component and finally triggers the shut-off actuator to cut off the valve for protection.

[0018] The present invention uses an integrated design of mechanical pressure sensing and execution to ensure the safety of the gas pressure regulating system while improving the response speed, reliability and maintenance convenience, and has significant technological progress and engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0020] Figure 1 This is a schematic diagram of the overall structure of a shut-off valve for a gas pressure regulator proposed by the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 Schematic diagram of the structure of the pressure-bearing trigger mechanism and linkage assembly in the present invention;

[0023] Figure 4 Schematic diagram of the matching relationship between the lock plate and the rotating shaft in the present invention;

[0024] Figure 5 It is a structural diagram of the positioning shaft and the limit block;

[0025] Among them: 1. Valve body; 2. Positioning shaft; 4. Adjusting bolt; 5. Top plate; 6. Spring 1; 7. Tube; 8. Tray; 9. Shell 2; 10. Diaphragm 1; 11. Spring seat 1; 12. Guide tube; 13. Pressure plate; 14. Valve disc 1; 15. Low-pressure chamber; 16. Valve stem; 17. Valve seat; 18. Valve disc 2; 19. High-pressure chamber; 20. Stop block; 21. Spring 2; 23. Spring seat 2; 2 4. Spring three; 25. Protective shell one; 26. Fixed tube; 27. Manual button; 28. Rotating shaft; 29. ​​Bracket; 30. Reset wheel; 31. Torsion spring one; 32. Protective shell two; 33. Notch; 35. Membrane two; 36. Shell one; 37. Limiting tube; 38. Handle; 39. Linkage piece; 40. Lock rod; 41. Lock plate; 42. Blocking plate; 43. Support plate; 44. Connecting rod; 45. Torsion spring two. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 5 As shown, the present invention provides a shut-off valve for a gas pressure regulator, comprising a valve body 1, a valve seat 17 being provided in the valve body 1, the valve body 1 being divided into a high-pressure chamber 19 and a low-pressure chamber 15 by the valve seat 17, a pressure-regulating assembly being provided at the top of the low-pressure chamber 15, the pressure-regulating assembly being communicated with the low-pressure chamber 15 through a pipeline, a valve stem 16 being connected to the middle of the pressure-regulating assembly, the valve stem 16 passing through the valve seat 17 and being connected to a valve flap 18, a shut-off actuator being provided in the low-pressure chamber 15, a pressure-bearing trigger mechanism being provided on one side of the low-pressure chamber 15, the pressure-bearing trigger mechanism being communicated with the low-pressure chamber 15, the pressure-bearing trigger mechanism and the shut-off actuator being transmitted and coordinated through a linkage assembly, and when the pressure in the low-pressure chamber 15 reaches the starting condition of the pressure-bearing trigger mechanism, the pressure-bearing trigger mechanism triggers the shut-off actuator through the linkage assembly to perform an action and seal the valve seat 17.

[0029] The pressure regulating component drives the valve stem 16 to move up and down according to the pressure adaptability of the low-pressure chamber 15. When the pressure in the low-pressure chamber 15 is too high, the pressure regulating component drives the valve stem 16 to move upward, so that the valve disc 18 is close to the valve seat 17 to reduce the opening, thereby reducing the pressure in the low-pressure chamber 15. Conversely, when the low-pressure chamber 15 is too low, the pressure regulating component drives the valve stem 16 to move downward, so that the valve disc 18 is away from the valve seat 17 to increase the opening, thereby increasing the pressure in the low-pressure chamber 15. When the pressure regulating component fails, the pressure in the low-pressure chamber 15 increases, and the pressure-bearing trigger mechanism drives the linkage component and finally triggers the cut-off actuator to cut off the valve for protection.

[0030] Furthermore, the pressure regulating assembly includes a shell 29 at the top of the low-pressure chamber 15, a membrane 10 is provided in the shell 29, the shell 29 is divided into an upper chamber and a lower chamber by the membrane 10, the lower chamber is connected to the low-pressure chamber 15 through a pipeline, and trays 8 are fixed on both sides of the membrane 10. The top of the valve stem 16 passes through the bottom wall of the shell 29 and is connected to the tray 8. The middle part of the top of the shell 29 is connected to the tube body 7, and a spring 16 is provided in the tube body 7. The bottom end of the spring 16 abuts against the tray 8, and the top of the spring 6 abuts against the pressure regulating part, which is provided at the top of the tube body 7.

[0031] When the pressure in the low-pressure chamber 15 changes, the gas enters the lower chamber through the pipeline, causing a pressure difference between the lower chamber and the upper chamber. When the pressure in the low-pressure chamber 15 is too high, the pressure in the lower chamber is greater than the pressure in the upper chamber and overcomes the elastic force of spring 16. The diaphragm 10 drives the tray 8 and the valve stem 16 to move upward, causing the valve disc 18 to move closer to the valve seat 17 and reduce the opening, thereby reducing the pressure in the low-pressure chamber 15. Conversely, the tray 8 drives the tray 8 and the valve stem 16 to move downward under the action of the rebound force of spring 16, causing the valve disc 18 to move away from the valve seat 17 and increase the opening, thereby increasing the gas flow to compensate for the pressure in the low-pressure chamber 15.

[0032] The compression degree of the spring 16 can be adjusted by the pressure regulating member, thereby controlling the pressure of the low-pressure chamber 15, that is, the outlet pressure of the valve.

[0033] Furthermore, the pressure regulating member includes an adjusting bolt 4 threadedly connected to the top of the tube body 7, a ball is embedded in the bottom end of the adjusting bolt 4, and the top end of the spring 6 is connected to the top plate 5, and the ball is in sliding contact with the top plate 5.

[0034] By rotating the adjusting bolt 4, the adjusting bolt 4 presses down the top plate 5 and the spring 1 6, thereby adjusting the compression amount of the spring 1 6, and then adjusting the reaction force of the spring 1 6.

[0035] Furthermore, the cut-off actuator includes a spring seat 11 fixedly connected to the top of the low-pressure chamber 15, a guide tube 12 is slidably sleeved on the valve stem 16, the top of the guide tube 12 is connected to the spring seat 11, and a spring 21 and a pressure plate 13 are slidably provided on the guide tube 12 from top to bottom, the top of the spring 21 is fixed to the spring seat 11, the bottom end of the spring 21 is fixedly connected to the pressure plate 13, and the bottom end of the pressure plate 13 is connected to the valve disc 14.

[0036] In the initial state, the pressure plate 13 is away from the valve seat 17 under the limiting action of the linkage assembly. When it needs to be cut off, the contact point between the linkage assembly and the pressure plate 13 is deflected. Under the reaction force of the spring 21, the pressure plate 13 drives the valve disc 14 to press against the valve seat 17 to seal and realize the cutting off of the valve.

[0037] Furthermore, the pressure-bearing trigger mechanism includes a second protective shell 32, a pressure-bearing component is provided at the top end of the second protective shell 32, and a pressure-bearing adjusting member is provided at the bottom end of the second protective shell 32, and the pressure-bearing adjusting member is used to adjust the pressure that the pressure-bearing component can withstand.

[0038] The pressure at which the pressure trigger mechanism starts cutting can be adjusted by a pressure adjusting member.

[0039] Furthermore, the pressure-bearing component includes a shell 1 36 fixedly arranged at the top of the protective shell 2 32, and a membrane 2 35 is arranged inside the shell 1 36. The shell 1 36 is divided into an upper chamber and a lower chamber by the membrane 2 35. The upper chamber is connected to the low-pressure chamber 15 through a conduit. The bottom end of the membrane 2 35 is connected to a support plate 43, and the support plate 43 is located in the lower chamber. The bottom end of the support plate 43 is fixedly connected to a connecting rod 44, which passes through the bottom wall of the shell 1 36 and is connected to the pressure-bearing adjusting member.

[0040] Natural gas is introduced into the upper chamber through the conduit, causing the pressure in the upper chamber to be greater than that in the lower chamber. The natural gas in the upper chamber pushes the support plate 43, which drives the connecting rod 44 to overcome the resistance of the pressure-bearing regulating member and move downward, forcing the linkage assembly to operate, causing the contact point between the linkage assembly and the pressure plate 13 to deflect. Under the reaction force of the spring 2 21, the pressure plate 13 drives the valve disc 14 to press against the valve seat 17 to seal and thereby cut off the valve.

[0041] Furthermore, the pressure-bearing regulating member includes a protective shell 25 connected to the bottom end of the shell 1 36, and the bottom end of the protective shell 25 is threadedly connected to a spring seat 23, and the spring seat 23 is an annular structure. A fixed tube 26 is slidably connected inside the spring seat 23, and the top end of the fixed tube 26 is connected to the bottom end of the connecting rod 44. A spring 3 24 is sleeved on the fixed tube 26, and the bottom end of the spring 3 24 abuts against the spring seat 23, and the spring 3 24 abuts against the flange on the fixed tube 26.

[0042] By rotating the spring seat 23, the compression amount of the spring 3 24 is adjusted, thereby adjusting the pressure value for starting the cutoff.

[0043] Furthermore, the linkage assembly includes a rotating shaft 28 rotatably connected to the protective shell 22, a bracket 29 is fixedly connected to the rotating shaft 28, a reset wheel 30 is rotatably connected to the bracket 29, a limiting tube 37 is fixedly provided on the connecting rod 44, an annular groove is provided on the limiting tube 37, a torsion spring 1 31 is provided on the rotating shaft 28, and the reset wheel 30 abuts in the annular groove through the torsion spring 1 31, and the protective shell 22 is rotatably connected to the lock plate 41 on the side away from the rotating shaft 28, and the tip of the lock plate 41 is connected to the rotating shaft through the torsion spring 2 45. The shaft 28 abuts, and a notch 33 is provided on the side of the rotating shaft 28 near the tip of the lock plate 41. When the rotating shaft 28 rotates, the tip of the lock plate 41 disengages from the rotating shaft 28 through the notch 33. A U-shaped notch is provided on the lock plate 41, and a linkage part is buckled in the U-shaped notch. The linkage part is connected to the positioning shaft 2, and the positioning shaft 2 is rotatably connected to the protective shell 2 32. One end of the positioning shaft 2 is connected to the limit block 20, and the limit block 20 is limited by the pressure plate 13. The positioning shaft 2 extends out of the protective shell 2 32 and is connected to the handle 38.

[0044] When the connecting rod 44 drives the limiting tube 37 to move downward, the reset wheel 30 is forced to disengage from the annular groove and at the same time press against the outer wall of the limiting tube 37. The reset wheel 30 drives the bracket 29 to rotate to overcome the torsion force of the torsion spring 1 31. The rotating bracket 29 drives the rotating shaft 28 to rotate, forcing the tip of the locking plate 41 to pass through the notch 33. At the same time, the locking plate 41 is disengaged from the limit of the rotating shaft 28 and deflected under the torsion force of the torsion spring 2 45. At the same time, the limiting relationship between the U-shaped notch and the linkage part is released. The pressure plate 13 pushes the limiting block 20 to deflect under the elastic force of the spring 2 21, and the limiting block 20 drives the positioning shaft 2 to rotate, thereby achieving cutting.

[0045] The positioning shaft 2 is rotated by rotating the handle 38 to achieve reset.

[0046] Furthermore, the linkage member includes a linkage piece 39 fixedly sleeved on the positioning shaft 2, and a locking rod 40 is connected to the positioning edge of the linkage piece 39, and the locking rod 40 is limitedly fitted in the U-shaped notch.

[0047] The locking rod 40 cooperates with the U-shaped notch to prevent the positioning shaft 2 from rotating.

[0048] Furthermore, a manual button 27 is provided on the second protective shell 32, and the manual button 27 is used to drive the rotating shaft 28 to rotate.

[0049] By pressing the manual button 27, the slide bar on the manual button 27 pushes the bottom end of the bracket 29 to rotate, and the cutting principle is the same as described above, thereby realizing manual cutting, which is convenient for user end maintenance.

[0050] Furthermore, in order to facilitate maintenance, a maintenance port is opened at the bottom end of the valve body 1. The maintenance port is blocked by a blocking plate 42, and the blocking plate 42 is fastened to the valve body 1 by bolts.

[0051] The shut-off valve for a gas pressure regulator provided by the present invention has a working principle as follows: when in use, the high-pressure chamber 19 is connected to the gas inlet, and the low-pressure chamber 15 is connected to the gas outlet. When the pressure regulation fails, the amount of natural gas entering the upper chamber continues to increase, causing the pressure in the upper chamber to be greater than the pressure in the lower chamber. When the pressure is greater than the rebound force of the spring 21, the support plate 43 drives the connecting rod 44 to move downward, forcing the reset wheel 30 to disengage from the annular groove on the limit tube 37 and at the same time press against the outer wall of the limit tube 37. The reset wheel 30 drives the bracket 29 to overcome the torsion of the torsion spring 31. The force rotates, and the rotating bracket 29 drives the rotating shaft 28 to rotate, forcing the tip of the locking plate 41 to pass through the notch 33. At the same time, the locking plate 41 is disengaged from the limit of the rotating shaft 28 and deflected under the torsion force of the torsion spring 2 45. At the same time, the locking rod 40 is disengaged from the U-shaped notch on the locking plate 41 to release the limit, thereby realizing the restraint of the positioning shaft 2. The pressure plate 13 pushes the limit block 20 to deflect under the elastic force of the spring 2 21, and the limit block 20 drives the positioning shaft 2 to rotate. Then the pressure plate 13 drives the valve disc 14 to press against the valve seat 17 to achieve cut-off.

[0052] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] The above are only preferred specific implementation methods of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A shut-off valve for a gas pressure regulator, characterized in that: The invention comprises a valve body (1), wherein a valve seat (17) is provided in the valve body (1), and the valve body (1) is divided into a high-pressure chamber (19) and a low-pressure chamber (15) by the valve seat (17); a pressure regulating assembly is provided at the top of the low-pressure chamber (15), and the pressure regulating assembly is communicated with the low-pressure chamber (15) through a pipeline; a valve stem (16) is connected to the middle of the pressure regulating assembly, and the valve stem (16) passes through the valve seat (17) and is connected to a second valve flap (18); a cut-off actuator is provided in the low-pressure chamber (15); a pressure-bearing trigger mechanism is provided on one side of the low-pressure chamber (15), and the pressure-bearing trigger mechanism is communicated with the low-pressure chamber (15); the pressure-bearing trigger mechanism and the cut-off actuator are transmitted and matched through a linkage assembly; when the pressure in the low-pressure chamber (15) reaches the starting condition of the pressure-bearing trigger mechanism, the pressure-bearing trigger mechanism triggers the cut-off actuator to perform an action through the linkage assembly and blocks the valve seat (17).

2. The shut-off valve for a gas pressure regulator according to claim 1, characterized in that: The pressure regulating assembly includes a shell 2 (9) at the top of the low-pressure chamber (15), a membrane 1 (10) is provided in the shell 2 (9), the shell 2 (9) is divided into an upper chamber and a lower chamber by the membrane 1 (10), the lower chamber is connected to the low-pressure chamber (15) through a pipeline, trays (8) are fixed on both sides of the membrane 1 (10), the top of the valve stem (16) passes through the bottom wall of the shell 2 (9) and is connected to the tray (8), the middle of the top of the shell 2 (9) is connected to the tube body (7), a spring 1 (6) is provided in the tube body (7), the bottom end of the spring 1 (6) abuts against the tray (8), the top of the spring 1 (6) abuts against a pressure regulating member, and the pressure regulating member is provided at the top of the tube body (7).

3. The shut-off valve for a gas pressure regulator according to claim 2, characterized in that: The pressure regulating member includes an adjusting bolt (4) threadedly connected to the top end of the tube body (7), a ball is embedded in the bottom end of the adjusting bolt (4), and the top end of the spring (6) is connected to a top plate (5), and the ball is in sliding contact with the top plate (5).

4. The shut-off valve for a gas pressure regulator according to claim 1, characterized in that: The cut-off actuator includes a spring seat 1 (11) fixedly connected to the top end of the low-pressure chamber (15), a guide tube (12) is slidably sleeved on the valve stem (16), the top end of the guide tube (12) is connected to the spring seat 1 (11), a spring 2 (21) and a pressure plate (13) are slidably arranged on the guide tube (12) from top to bottom, the top end of the spring 2 (21) is fixed to the spring seat 1 (11), the bottom end of the spring 2 (21) is fixedly connected to the pressure plate (13), and the bottom end of the pressure plate (13) is connected to a valve flap 1 (14).

5. The shut-off valve for a gas pressure regulator according to claim 4, characterized in that: The pressure-bearing trigger mechanism includes a second protective shell (32), a pressure-bearing component is provided at the top end of the second protective shell (32), and a pressure-bearing adjusting member is provided at the bottom end of the second protective shell (32), and the pressure-bearing adjusting member is used to adjust the pressure that the pressure-bearing component can withstand.

6. The shut-off valve for a gas pressure regulator according to claim 5, characterized in that: The pressure-bearing component includes a shell one (36) fixedly arranged at the top end of the protective shell two (32), a membrane two (35) is arranged inside the shell one (36), the shell one (36) is divided into an upper chamber and a lower chamber by the membrane two (35), the upper chamber is connected to the low-pressure chamber (15) through a conduit, the bottom end of the membrane two (35) is connected to a support plate (43), the support plate (43) is located in the lower chamber, the bottom end of the support plate (43) is fixedly connected to a connecting rod (44), the connecting rod (44) passes through the bottom wall of the shell one (36) and is connected to the pressure-bearing regulating member.

7. The shut-off valve for a gas pressure regulator according to claim 6, characterized in that: The pressure-bearing regulating member includes a protective shell 1 (25) connected to the bottom end of the housing 1 (36), the bottom end of the protective shell 1 (25) is threadedly connected to a spring seat 2 (23), the spring seat 2 (23) is an annular structure, a fixed tube (26) is slidably connected inside the spring seat 2 (23), the top end of the fixed tube (26) is connected to the bottom end of the connecting rod (44), a spring 3 (24) is sleeved on the fixed tube (26), the bottom end of the spring 3 (24) is in contact with the spring seat 2 (23), and the spring 3 (24) is in contact with the flange on the fixed tube (26).

8. The shut-off valve for a gas pressure regulator according to claim 6, characterized in that: The linkage assembly includes a rotating shaft (28) rotatably connected to the second protective shell (32), a bracket (29) fixedly connected to the rotating shaft (28), a reset wheel (30) rotatably connected to the bracket (29), a position limiting tube (37) fixedly sleeved on the connecting rod (44), an annular groove provided on the position limiting tube (37), a torsion spring (31) provided on the rotating shaft (28), the reset wheel (30) abuts against the annular groove through the torsion spring (31), the side of the second protective shell (32) away from the rotating shaft (28) is rotatably connected to the lock plate (41), the tip of the lock plate (41) is connected to the rotating shaft (28) through the torsion spring (45). A notch (33) is provided on one side of the rotating shaft (28) close to the tip of the locking plate (41). When the rotating shaft (28) rotates, the tip of the locking plate (41) is separated from the rotating shaft (28) through the notch (33). A U-shaped notch is provided on the locking plate (41). A linkage member is buckled in the U-shaped notch. The linkage member is connected to a positioning shaft (2). The positioning shaft (2) is rotatably connected to the second protective shell (32). One end of the positioning shaft (2) is connected to a limiting block (20). The limiting block (20) is limitedly matched with the pressing plate (13). The positioning shaft (2) extends out of the second protective shell (32) and is connected to a handle (38).

9. The shut-off valve for a gas pressure regulator according to claim 8, characterized in that: The linkage member comprises a linkage piece (39) fixedly sleeved on the positioning shaft (2); a positioning edge of the linkage piece (39) is connected to a locking rod (40); and the locking rod (40) is limitedly fitted in the U-shaped notch.

10. The shut-off valve for a gas pressure regulator according to claim 8, characterized in that: The second protective shell (32) is provided with a manual button (27), and the manual button (27) is used to drive the rotating shaft (28) to rotate.

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