Pressure regulating pneumatic valve with overflow function

Abstract

The invention provides a pressure regulating pneumatic valve with an overflow function, and belongs to the technical field of valves, the pressure regulating pneumatic valve comprises a valve body, and an execution assembly, an overflow assembly, a sealing assembly and an alarm assembly which are arranged on the valve body, a valve seat is mounted in the valve body, and a fixed seat is mounted on the inner wall of the upper end of the valve body. According to the system, the overflow assembly is arranged, so that the air source can more quickly release pressure when the pressure of the air source is higher than a set value, and therefore, the pressure of the air source in the actuator assembly is quickly reduced, and the system can quickly recover to a stable state; meanwhile, an arranged sealing assembly repeatedly utilizes an overflowing air source when the pressure of the air source is higher than a set value, a sealing column is sealed and fixed through cooperation with an air bag ring, the sealing effect of the valve is further improved, and an arranged alarm assembly gives an alarm when the pressure of the air source is higher than system bearing for a long time; workers are reminded to overhaul the air source system in time, and equipment damage caused by the fact that the air source pressure is higher than the bearing value for a long time is avoided.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a pressure-regulating pneumatic valve with an overflow function. Background Art

[0002] In pneumatic control systems, pressure regulating valves play a key role in stabilizing and regulating the pressure of the gas source. Pressure regulating pneumatic valves are industrial automation components that use compressed air as a power source to regulate and control gas pressure. They are widely used in petroleum, chemical, electric power, metallurgy and other industries, and play an important role in ensuring the stability and safety of the production process.

[0003] In the prior art, ordinary pressure-regulating pneumatic valves may not be able to release pressure in time when facing a sudden high pressure of the gas source pressure, and can only reduce the input of the gas source to slowly release pressure, which increases the risk of overpressure. Excessive pressure will damage the joint parts in the valve. At the same time, the inability to release pressure quickly makes the system take a longer time to return to a stable state. How to invent a pressure-regulating pneumatic valve with overflow function to solve these problems has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a pressure-regulating pneumatic valve with an overflow function, aiming to solve the problem that ordinary pressure-regulating pneumatic valves cannot quickly release pressure when facing a sudden high pressure situation of the air source pressure.

[0005] The present invention is achieved in that: The present invention provides a pressure regulating pneumatic valve with overflow function, comprising a valve body and an actuator assembly, an overflow assembly, a sealing assembly and an alarm assembly arranged on the valve body, wherein a valve seat is installed inside the valve body, a fixing seat is installed on the inner wall of the upper end of the valve body, a pressure regulating spring and a plurality of fixing rods are installed on the upper end of the fixing seat, a top seat is installed on the upper end of the fixing rod, and a fixing disk slidably connected to the fixing rod is installed on the upper end of the pressure regulating spring; The actuator is mounted on the top seat by bolts, and the actuator regulates the pressure of the valve body; The overflow component is installed inside the actuator component, and the overflow component discharges the excess gas source in the actuator component; The sealing component is installed in the valve seat, and the sealing component improves the sealing effect of the valve seat when the valve is closed; The alarm component is installed on the slide rod, and the alarm component alarms when the pressure load of the actuator component is too high.

[0006] Preferably, the actuator assembly comprises two actuator housings, a diaphragm is installed between the two actuator housings by bolts, and an upper positioning plate and a lower positioning plate are installed on upper and lower sides of the diaphragm by bolts.

[0007] Preferably, a valve stem is installed on one side of the lower positioning plate, and the outer wall of the valve stem is slidably connected to the inner walls of the actuator housing, the top seat and the fixed seat respectively, and the outer wall of the valve stem is fixedly connected to the fixed plate.

[0008] Preferably, the overflow assembly includes an overflow block installed on the inner wall of the upper end of the actuator housing, a piston cavity is opened inside the overflow block, two groups of overflow holes connected to the interior of the actuator housing are opened on the inner wall of the piston cavity, a first piston rod fixedly connected to the upper positioning plate is installed on the inner wall of the piston cavity, and an overflow pipe is installed on the upper inner wall of the piston cavity.

[0009] By adopting the above technical solution, when the air source pressure inside the actuator assembly fluctuates and is higher than the set value, the first piston rod inside the overflow block slides down to connect the overflow hole and the internal cavity of the actuator housing, so that the excess internal pressure enters the overflow block through the overflow hole and is discharged through the overflow pipe arranged at the upper end, thereby maintaining the constant air source input pressure, maintaining the constancy of the valve, ensuring that the valve outlet pressure fluctuates within the set range, and at the same time, the subsequent input pressure can be reduced more quickly, and the system can return to a stable position more quickly.

[0010] Preferably, a groove is provided at the lower end of the valve stem, a buffer spring is installed on the inner wall of the groove, a sliding rod slidably connected to the inner wall of the groove is installed at one end of the buffer spring, a valve core is installed at one end of the sliding rod, and a sealing column is installed at the lower end of the valve core.

[0011] By adopting the above technical solution, the valve is in a normally open state under normal conditions, and the pressure at the valve outlet controls the pressure of compressed air input into the actuator assembly through the air source pipe, thereby forcing the diaphragm to push the valve stem to move the valve core toward one end of the valve seat, thereby controlling the opening and closing degree of the valve and thus controlling the pressure at the valve outlet to be stable. When the air source pressure is overloaded, the spring arranged at the lower end of the valve stem can reduce the direct pressure between the valve core and the valve seat, thereby avoiding wear between the valve core and the valve seat caused by excessive air source pressure inside the actuator assembly.

[0012] Preferably, the sealing assembly includes an air bag ring installed on the inner wall of the valve seat and an adjustment groove opened at the upper end of the valve seat, the inner wall of the air bag ring is fixedly connected to one end of the overflow pipe, the other end of the air bag ring is installed with an air outlet pipe, and the air bag ring is installed with an exhaust sleeve near the inner wall of the adjustment groove.

[0013] Preferably, an exhaust sleeve is installed at one end of the exhaust pipe, and a plurality of exhaust holes are opened on the outer wall of the exhaust sleeve near the lower end. A positioning spring is installed on the upper inner wall of the exhaust sleeve, and a piston block connected to the piston on the inner wall of the exhaust sleeve is installed on the lower side wall of the positioning spring.

[0014] Preferably, an adjusting spring is installed on the inner wall of the adjusting groove, an adjusting rod slidably connected to the inner wall of the adjusting groove is installed on the upper side wall of the adjusting spring, and a second piston rod connected to the inner wall piston of the piston sleeve is installed on the lower end of the adjusting rod.

[0015] By adopting the above technical solution, when the gas source pressure exceeds the set value, the valve core and the valve seat are closed, and at the same time, the gas in the overflow pipe causes the airbag ring to expand, so that the inner wall of the airbag ring is tightly wrapped around the outer wall of the sealing column, thereby improving the sealing strength between the valve core and the valve seat.

[0016] Preferably, the alarm component includes a fixing frame installed on the sliding rod and a fixing block installed on the outer wall of one side of the fixed plate, the outer wall of the sliding rod and the inner wall of the fixing frame are fixedly connected, a pressure sensor and a buzzer are respectively installed on the upper end of the fixing frame, a contact block is installed on the lower end of the fixing block, and a timer is installed in the pressure sensor.

[0017] By adopting the above technical solution, when the pressure inside the actuator assembly fluctuates to the maximum load, the diaphragm is squeezed to drive the valve stem downward so that the valve core fits tightly against the valve seat, and the slide rod completely enters the groove at the lower end of the valve stem. At the same time, the fixed plate on the outer side of the valve stem slides down, and the contact block on one side squeezes the pressure sensor. When the pressure sensor is squeezed for more than the set time, the buzzer alarms, so that the staff can quickly inspect the input air source system to avoid damage to the equipment caused by long-term overpressure inside the actuator.

[0018] The beneficial effects of the present invention are: The overflow component is set to release the gas pressure more quickly when the gas source pressure is higher than the set value, thereby quickly reducing the gas source pressure inside the actuator component and allowing the system to quickly return to a stable state. At the same time, the sealing component is set to reuse the overflowed gas source when the gas source pressure is higher than the set value, and cooperate with the air bag ring to seal and fix the sealing column to further improve the sealing effect of the valve. The alarm component is set to alarm when the gas source pressure is higher than the system load for a long time, so as to promptly remind the staff to inspect the gas source system and avoid damage to the equipment caused by the gas source pressure being higher than the load value for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1This is a front view of the overall structure of a pressure regulating pneumatic valve with overflow function provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a pressure regulating pneumatic valve alarm assembly with overflow function provided by an embodiment of the present invention; Figure 3 It is a half-section diagram of the structure of a pressure-regulating pneumatic valve actuator assembly with overflow function provided by an embodiment of the present invention; Figure 4 It is a half-section diagram of a valve body structure of a pressure regulating pneumatic valve with overflow function provided by an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a pressure regulating pneumatic valve sealing assembly with overflow function provided by an embodiment of the present invention; Figure 6 It is a cross-sectional view of a pressure regulating pneumatic valve sealing assembly with overflow function provided by an embodiment of the present invention; Figure 7 A pressure regulating pneumatic valve with overflow function provided by the embodiment of the present invention Figure 6 A magnified view of the structure of area A.

[0021] In the figure: 1. valve body; 11. valve seat; 12. fixed seat; 13. pressure regulating spring; 14. top seat; 15. fixed rod; 16. fixed plate; 2. actuator housing; 21. diaphragm; 22. lower positioning plate; 23. valve stem; 231. groove; 24. buffer spring; 25. slide rod; 26. valve core; 261. sealing column; 27. upper positioning plate; 28. air source pipe; 3. overflow block; 31. overflow hole ; 32. Piston chamber; 33. First piston rod; 34. Overflow pipe; 4. Air bag ring; 41. Piston sleeve; 42. Exhaust pipe; 43. Adjustment groove; 44. Adjustment spring; 45. Adjustment rod; 46. Second piston rod; 47. Exhaust sleeve; 471. Exhaust hole; 48. Positioning spring; 49. Piston block; 5. Fixed bracket; 51. Pressure sensor; 52. Buzzer; 53. Fixed block; 54. Contact block. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0023] Embodiment 1, refer to Figure 1-Figure 7A pressure-regulating pneumatic valve with an overflow function comprises a valve body 1 and an actuator, an overflow assembly, a sealing assembly and an alarm assembly arranged on the valve body 1. A valve seat 11 is installed inside the valve body 1, a fixed seat 12 is installed on the inner wall of the upper end of the valve body 1, a pressure-regulating spring 13 and a plurality of fixed rods 15 are installed on the upper end of the fixed seat 12, a top seat 14 is installed on the upper end of the fixed rod 15, and a fixed disk 16 slidably connected to the fixed rod 15 is installed on the upper end of the pressure-regulating spring 13; the actuator is installed on the top seat 14 by bolts, and the actuator regulates the pressure of the valve body 1; the overflow assembly is installed inside the actuator, and the overflow assembly discharges the excess air source in the actuator; the sealing assembly is installed in the valve seat 11, and the sealing assembly improves the sealing effect of the valve seat 11 when the valve is closed; the alarm assembly is installed on the sliding rod 25, and the alarm assembly alarms when the pressure bearing capacity of the actuator is too high.

[0024] The actuator assembly includes two actuator housings 2, a diaphragm 21 is installed between the two actuator housings 2 by bolts, an upper positioning plate 27 and a lower positioning plate 22 are installed on the upper and lower sides of the diaphragm 21 by bolts, an air source pipe 28 is installed on the inner wall of one end of the actuator housing 2 close to the top of the diaphragm 21, a valve stem 23 is installed on one side of the lower positioning plate 22, the outer wall of the valve stem 23 is slidably connected to the inner walls of the actuator housing 2, the top seat 14 and the fixed seat 12 respectively, and the outer wall of the valve stem 23 is fixedly connected to the fixed plate 16; the overflow assembly includes an overflow block 3 installed on the inner wall of the upper end of the actuator housing 2, a piston chamber 32 is opened inside the overflow block 3, and two groups of overflow holes 31 connected to the inside of the actuator housing 2 are opened on the inner wall of the piston chamber 32, a first piston rod 33 fixedly connected to the upper positioning plate 27 is installed on the inner wall of the piston chamber 32, and an overflow pipe 34 is installed on the upper inner wall of the piston chamber 32.

[0025] A pressure regulating pneumatic valve with overflow function, in order to solve the problem that the traditional pneumatic pressure regulating valve cannot discharge the excess gas when the gas source pressure is too high; The valve is in a normally open state in a normal state, and the pressure of the air source entering the actuator assembly is controlled by the pressure at the valve outlet. When the air source pressure entering the actuator assembly fluctuates and is overloaded, the pressure inside the actuator housing 2 near the top of the diaphragm 21 increases, forcing the diaphragm 21 to deform downward while driving the valve stem 23 to move downward. At the same time, a depression occurs above the diaphragm 21, causing the first piston rod 33 to move downward. When the outer wall of the first piston rod 33 is separated from the blockage of the overflow hole 31, part of the air source inside the actuator assembly enters the overflow block 3 through the overflow hole 31 and is discharged through the air source pipe 28, thereby quickly reducing the air source pressure inside the actuator assembly, avoiding excessive air source pressure from acting on the connection points of various parts on the actuator assembly to cause damage, and improving the protection of the equipment. At the same time, the overflow group set when the air source pressure rises abnormally adds an outlet for the air source, so that the air source can be depressurized more quickly, so that the air source system can quickly return to a stable state.

[0026] In the second embodiment, a groove 231 is provided at the lower end of the valve stem 23, a buffer spring 24 is installed on the inner wall of the groove 231, a slide rod 25 slidably connected to the inner wall of the groove 231 is installed at one end of the buffer spring 24, a valve core 26 is installed at one end of the slide rod 25, a sealing column 261 is installed at the lower end of the valve core 26, and the sealing assembly includes an airbag ring 4 installed on the inner wall of the valve seat 11 and an adjusting groove 43 provided at the upper end of the valve seat 11, the inner wall of the airbag ring 4 is fixedly connected to one end of the overflow pipe 34, an air outlet pipe 42 is installed at the other end of the airbag ring 4, and the airbag ring 4 is close to the adjusting groove 43. An exhaust sleeve 47 is installed on the inner wall, an exhaust sleeve 47 is installed on one end of the exhaust pipe 42, a plurality of exhaust holes 471 are opened on the outer wall of the exhaust sleeve 47 near the lower end, a positioning spring 48 is installed on the upper inner wall of the exhaust sleeve 47, a piston block 49 connected to the inner wall piston of the exhaust sleeve 47 is installed on the lower side wall of the positioning spring 48, an adjusting spring 44 is installed on the inner wall of the adjusting groove 43, an adjusting rod 45 slidably connected to the inner wall of the adjusting groove 43 is installed on the upper side wall of the adjusting spring 44, and a second piston rod 46 connected to the inner wall piston of the piston sleeve 41 is installed on the lower end of the adjusting rod 45; In this embodiment, in order to avoid excessive pressure on the contact surface between the valve core 26 and the valve seat 11 when the gas source pressure is overloaded, causing damage and affecting the sealing effect of the valve.

[0027] When the gas source pressure reaches the set value, the valve core 26 just seals with the valve seat 11, and the valve core 26 presses against the adjusting rod 45 to make the second piston rod 46 slide down to the lowest position of the piston sleeve 41, thereby reducing the gas storage volume inside the air bag ring 4. When the gas source pressure is over-pressured, the valve stem 23 continues to move under the action of the buffer spring 24, and the valve core 26 seals on the valve seat 11 while maintaining the stability of the contact surface pressure, avoiding the damage of the sealing surface caused by the excessive pressure of the valve core 26 on the valve seat 11, thereby maintaining the sealing effect. At the same time, the overflowing gas during the over-pressure process enters the air bag ring 4 to expand it, and then the inner wall of the air bag ring 4 is tightly covered on the outer wall of the sealing column 261, so as to seal and fix the sealing column 261, further improving the sealing effect of the valve, and at the same time, one end of the air bag ring 4 is exhausted. The exhaust sleeve 47 arranged on the tube 42 pushes the piston block 49 to squeeze the positioning spring 48 to slide when the airbag ring 4 reaches the maximum bearing air pressure, and discharges the excess gas through the air outlet 471 to prevent the airbag ring 4 from bursting while maintaining the expansion of the airbag ring 4, thereby protecting the airbag ring 4 in real time. At the same time, in the subsequent process of pressure recovery and stabilization, in order to improve the sensitivity of the movement of the valve stem 23, the valve stem 23 drives the valve core 26 to slide upward, and at the same time, the adjusting rod 45 drives the second piston rod 46 to slide upward, thereby increasing the gas storage volume inside the airbag ring 4. At this time, the internal gas flows to fill the piston sleeve 41 to reduce the expansion volume of the airbag ring 4, thereby reducing the friction between the sealing column 261, so that the valve core 26 can be smoothly disengaged, so that the valve stem 23 can quickly respond to the system to move.

[0028] Embodiment 3, the alarm assembly includes a fixing frame 5 installed on the slide bar 25 and a fixing block 53 installed on the outer wall of one side of the fixing plate 16, the outer wall of the slide bar 25 and the inner wall of the fixing frame 5 are fixedly connected, the upper end of the fixing frame 5 is respectively installed with a pressure sensor 51 and a buzzer 52, the lower end of the fixing block 53 is installed with a contact block 54, and the pressure sensor 51 is installed with a timer; In this embodiment, in order to prevent the pressure relief speed of the overflow component from being lower than the speed of the air source pressure fluctuation overload, causing overpressure damage to the actuator component; When the gas source is over-pressured for a long period of time, the pressure relief speed is lower than the pressure increase speed inside the actuator assembly, and the valve stem 23 squeezes the buffer spring 24 to reach the maximum compression of the spring and remains fixed. At the same time, the fixed disk 16 outside the valve stem 23 slides downward at the same time, and the contact block 54 and the pressure sensor 51 at one end of the valve stem 23 are squeezed when the valve stem 23 is stationary. When the squeezing state lasts for more than the set value, the buzzer 52 is triggered to alarm, reminding the staff to promptly inspect the gas source system to avoid damage to the equipment caused by the gas source pressure being higher than the load value for a long time.

[0029] The working principle of a pressure regulating pneumatic valve with overflow function: The valve is in the normally open state under normal conditions, and the compressed air source enters the actuator assembly through the air source pipe 28. When the pressure at the valve outlet is higher than the set value, the air source pressure increases, forcing the valve stem 23 to drive the valve core 26 to move to one side of the valve seat 11, thereby reducing the flow of the fluid and thus reducing the pressure at the outlet. When the air source pressure fluctuates and exceeds the set value, the valve is closed at this time, and the overflow assembly opens to discharge the excess air source into the sealing assembly to expand the airbag ring 4 to improve the sealing effect of the valve. At the same time, the excess air source is discharged through the exhaust sleeve 47. When the pressure of the compressed air source is always greater than the system bearing pressure for a certain period of time, the pressure sensor 51 starts timing from being triggered. When the triggering time exceeds the set time, the buzzer 52 alarms, so that the staff can quickly adjust the system of the input air source to avoid long-term overpressure inside the actuator causing damage to the equipment.

[0030] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure regulating pneumatic valve with overflow function, comprising a valve body (1) and an actuator component, an overflow component, a sealing component and an alarm component arranged on the valve body (1), characterized in that: A valve seat (11) is installed inside the valve body (1), a fixing seat (12) is installed on the inner wall of the upper end of the valve body (1), a pressure regulating spring (13) and a plurality of fixing rods (15) are installed on the upper end of the fixing seat (12), a top seat (14) is installed on the upper end of the fixing rod (15), and a fixing plate (16) slidably connected to the fixing rod (15) is installed on the upper end of the pressure regulating spring (13); The actuator is mounted on the top seat (14) by means of bolts, and the actuator regulates the pressure of the valve body (1); The overflow component is installed inside the actuator component, and the overflow component discharges the excess gas source in the actuator component; The sealing component is installed in the valve seat (11), and the sealing component improves the sealing effect of the valve seat (11) when the valve is closed; The alarm component is mounted on the slide bar (25), and the alarm component gives an alarm when the pressure load of the actuator component is too high.

2. A pressure regulating pneumatic valve with overflow function according to claim 1, characterized in that: The actuator assembly comprises two actuator housings (2), a diaphragm (21) mounted between the two actuator housings (2) by means of bolts, an upper positioning plate (27) and a lower positioning plate (22) mounted on the upper and lower sides of the diaphragm (21) by means of bolts, and an air source pipe (28) mounted on the inner wall of one end of the actuator housing (2) above the diaphragm (21).

3. A pressure regulating pneumatic valve with overflow function according to claim 2, characterized in that: A valve stem (23) is mounted on one side of the lower positioning plate (22); the outer wall of the valve stem (23) is slidably connected to the inner wall of the actuator housing (2), the top seat (14) and the fixed seat (12), respectively; and the outer wall of the valve stem (23) is fixedly connected to the fixed plate (16).

4. A pressure regulating pneumatic valve with overflow function according to claim 3, characterized in that: The overflow assembly comprises an overflow block (3) mounted on the inner wall of the upper end of the actuator housing (2); a piston chamber (32) is provided inside the overflow block (3); two groups of overflow holes (31) are provided on the inner wall of the piston chamber (32) and are connected to the interior of the actuator housing (2); a first piston rod (33) fixedly connected to the upper positioning plate (27) is mounted on the inner wall of the piston chamber (32); and an overflow pipe (34) is mounted on the inner wall of the upper end of the piston chamber (32).

5. The pressure regulating pneumatic valve with overflow function according to claim 4, characterized in that: A groove (231) is formed at the lower end of the valve stem (23), a buffer spring (24) is installed on the inner wall of the groove (231), a slide rod (25) slidably connected to the inner wall of the groove (231) is installed at one end of the buffer spring (24), a valve core (26) is installed at one end of the slide rod (25), and a sealing column (261) is installed at the lower end of the valve core (26).

6. The pressure regulating pneumatic valve with overflow function according to claim 5, characterized in that: The sealing assembly comprises an air bag ring (4) mounted on the inner wall of the valve seat (11) and an adjusting groove (43) provided at the upper end of the valve seat (11); the inner wall of the air bag ring (4) is fixedly connected to one end of an overflow pipe (34); an air outlet pipe (42) is mounted on the other end of the air bag ring (4); and an exhaust sleeve (47) is mounted on the inner wall of the air bag ring (4) close to the adjusting groove (43).

7. The pressure regulating pneumatic valve with overflow function according to claim 6, characterized in that: An exhaust sleeve (47) is installed at one end of the exhaust pipe (42); a plurality of exhaust holes (471) are provided on an outer wall of the exhaust sleeve (47) near the lower end; a positioning spring (48) is installed on the inner wall of the upper end of the exhaust sleeve (47); and a piston block (49) connected to a piston on the inner wall of the exhaust sleeve (47) is installed on the side wall of the lower end of the positioning spring (48).

8. The pressure regulating pneumatic valve with overflow function according to claim 7, characterized in that: An adjusting spring (44) is mounted on the inner wall of the adjusting groove (43); an adjusting rod (45) slidably connected to the inner wall of the adjusting groove (43) is mounted on the upper side wall of the adjusting spring (44); and a second piston rod (46) piston-connected to the inner wall of the piston sleeve (41) is mounted on the lower end of the adjusting rod (45).

9. The pressure regulating pneumatic valve with overflow function according to claim 8, characterized in that: The alarm assembly comprises a fixing frame (5) mounted on a slide bar (25) and a fixing block (53) mounted on an outer wall of one side of a fixing plate (16); the outer wall of the slide bar (25) and the inner wall of the fixing frame (5) are fixedly connected; a pressure sensor (51) and a buzzer (52) are respectively mounted on the upper end of the fixing frame (5); a contact block (54) is mounted on the lower end of the fixing block (53); and a timer is mounted in the pressure sensor (51).

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