A pneumatic diaphragm regulating valve

Abstract

The present invention relates to the technical field of pneumatic diaphragm regulating valves, and more specifically, to a pneumatic diaphragm regulating valve comprising a stroke scale, a first sealing cover, a valve body, a valve core body, a push rod, a locking and fastening device, a second sealing cover, a limit clamp, a return spring, and a pneumatic actuator, wherein the first sealing cover is fixedly mounted on the upper end of the valve body by bolts, the second sealing cover is fixedly connected to the upper end of the first sealing cover by bolts, the pneumatic actuator is fixedly connected to the upper end of the second sealing cover, the limit clamp is fixedly mounted inside the upper end of the second sealing cover, the return spring is arranged inside the limit clamp, and the push rod is slidably arranged in the middle of the first sealing cover and the second sealing cover. The present invention, by providing a control unit and a locking and fastening device, can automatically lock and adjust the extrusion force compensation of the push rod, so that the push rod can always and stably squeeze the valve core body for a long time, so that the valve core body can seal and block the middle of the valve body for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic diaphragm regulating valves, in particular to a pneumatic diaphragm regulating valve. Background Art

[0002] A pneumatic diaphragm control valve uses pneumatic signals to control the position of the valve core to adjust parameters such as flow, pressure, or liquid level. It primarily consists of a pneumatic actuator and a valve body. The pneumatic actuator receives pneumatic signals from the control system and changes the position of the valve core by controlling the opening and closing of the air source and exhaust port, thereby adjusting the flow rate. The valve body, responsible for controlling the flow of the medium, exhibits excellent corrosion resistance and sealing properties. However, during use, existing pneumatic diaphragm control valves experience slight movement of the valve core as the gas pressure acting on the pneumatic diaphragm changes, resulting in poor sealing of the valve body. Furthermore, the valve core and valve body cannot be tightly squeezed together, and the presence of a gap also reduces the valve body's blocking ability. Therefore, a device is needed to address these issues. Summary of the Invention

[0003] In view of the problems in the prior art, the present invention provides a pneumatic diaphragm regulating valve.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a pneumatic diaphragm regulating valve, including a stroke scale, a first sealing upper cover, a valve body, a valve core body, a push rod, a locking clamping device, a second sealing upper cover, a limit clamping seat, a reset spring and a pneumatic actuator, the first sealing upper cover is fixedly installed on the upper end of the valve body by bolts, the second sealing upper cover is fixedly connected to the upper end of the first sealing upper cover by bolts, the pneumatic actuator is fixedly connected to the upper end of the second sealing upper cover, the limit clamping seat is fixedly installed inside the upper end of the second sealing upper cover, and the reset spring is set Inside the limit clamping seat, the push rod is slidably arranged in the middle of the first sealing upper cover and the second sealing upper cover, the stroke scale is arranged on the second sealing upper cover, the locking clamping device is arranged on the first sealing upper cover, the valve core body is fixedly connected to the bottom end of the push rod, and the valve core body is located inside the valve body. By arranging the control part and the locking clamping device, the push rod can be automatically locked and the extrusion force compensation adjustment can be performed, so that the push rod can always stably squeeze the valve core body for a long time, so that the valve core body can seal and block the middle of the valve body for a long time;

[0005] The pneumatic actuator includes an air inlet pipe, an upper cavity of a membrane chamber, a lower cavity of a membrane chamber, a control unit and a fixing bolt. The air inlet pipe is symmetrically fixed on the upper cavity of the membrane chamber. The control unit is fixed between the upper cavity of the membrane chamber and the lower cavity of the membrane chamber by the fixing bolt, and the control unit is located inside the upper cavity of the membrane chamber and the lower cavity of the membrane chamber.

[0006] The control part includes a fixing nut, an electrical terminal, a first electric push rod, an extrusion disk, a diaphragm and an extrusion limit spring, the upper end of the push rod is fixedly connected to the middle part of the diaphragm through the fixing nut, the extrusion limit spring is evenly fixedly connected to the upper end of the diaphragm, the extrusion disk is clamped on the upper end of the extrusion limit spring, the driving end of the first electric push rod is fixedly connected to the upper end of the extrusion disk, the electrical terminal is fixedly connected to the first electric push rod, and the electrical terminal is fixedly arranged on the upper cavity of the diaphragm chamber;

[0007] The locking and fixing device includes a limit frame and a locking part, the locking part is symmetrically arranged on the limit frame, the locking part includes a sliding column, a movable push-pull plate, a second electric push rod and an arc-shaped locking clamp ring, the sliding column is symmetrically fixedly installed in the middle of the movable push-pull plate, the arc-shaped locking clamp ring is fixedly connected to the end of the sliding column away from the movable push-pull plate, the second electric push rod is distributed on the inner side of the movable push-pull plate, and the driving end of the second electric push rod is fixedly connected to the movable push-pull plate;

[0008] The valve core body includes an auxiliary sealing portion, a sealing valve core and a connecting plate, wherein the connecting plate is fixedly connected to the upper end of the sealing valve core, the auxiliary sealing portion is arranged on both sides of the sealing valve core, and the auxiliary sealing portion includes a rotating connecting shaft, an auxiliary extrusion sealing plate and an extrusion sealing spring, wherein the rotating connecting shaft is fixedly arranged at the bottom end of the auxiliary extrusion sealing plate, and the extrusion sealing spring is evenly fixedly arranged on the inner side of the auxiliary extrusion sealing plate;

[0009] Mounting holes are provided on both sides of the sealing valve core, and a mounting groove is provided at the bottom end of the sealing valve core. Third electric push rods are fixedly installed inside both sides of the sealing valve core, and the connecting plate is rotatably connected to the driving end of the third electric push rod. The two sides of the sealing valve core are fixedly connected to the auxiliary extrusion sealing plate through the extrusion sealing spring, so that when the sealing valve core squeezes the conveying groove set in the middle of the valve body, the auxiliary extrusion sealing plate is fully in contact with the conveying groove, and the conveying groove is fully blocked. By controlling the third electric push rod inside the sealing valve core and making its front end extend forward a specified distance, the auxiliary extrusion sealing plate can be squeezed and expanded outward, thereby achieving a better sealing effect.

[0010] Preferably, the diaphragm is located between the upper cavity of the membrane chamber and the lower cavity of the membrane chamber, and the fixing bolt is threadedly fixed between the upper cavity of the membrane chamber, the lower cavity of the membrane chamber and the edge of the diaphragm.

[0011] Preferably, a pressure sensor is fixedly installed inside the upper end of the upper cavity of the membrane chamber.

[0012] Preferably, the upper portion of the push rod is extruded onto the upper end of the return spring.

[0013] Preferably, the limiting frame is fixedly mounted on the first sealing upper cover.

[0014] Preferably, the sealing valve core seals the valve body.

[0015] Preferably, the bottom end of the push rod is fixedly connected to the middle part of the upper end of the connecting plate.

[0016] Preferably, the rotating connecting shaft is rotatably engaged in the interior of the mounting groove.

[0017] Preferably, the extrusion sealing spring is fixedly mounted inside the mounting hole, and the connecting plate is connected to the inner side of the auxiliary extrusion sealing plate.

[0018] Preferably, a rubber sheet is fixedly connected to the outer end face of the auxiliary extrusion sealing plate. By fixing the rubber sheet on the outer end face of the auxiliary extrusion sealing plate, when the sealing valve core squeezes the auxiliary extrusion sealing plate to seal and block the middle part of the valve body, the middle part of the valve body can be completely sealed, thereby achieving a better sealing effect.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention can automatically lock and adjust the extrusion force compensation of the push rod by providing a control part and a locking and fixing device, so that the push rod can always stably squeeze the valve core body for a long time, so that the valve core body can seal and block the middle part of the valve body for a long time.

[0021] 2. The two sides of the sealing valve core of the present invention are fixedly connected to the auxiliary extrusion sealing plate through the extrusion sealing spring, so that when the sealing valve core squeezes the conveying groove set in the middle of the valve body, the auxiliary extrusion sealing plate is fully in contact with the conveying groove, and the conveying groove is fully blocked. In addition, by controlling the third electric push rod inside the sealing valve core, its front end is extended forward by a specified distance, so that the auxiliary extrusion sealing plate can be squeezed and expanded outward, thereby achieving a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the pneumatic actuator in the present invention;

[0025] Figure 3 This is a schematic diagram of the disassembly of the pneumatic actuator in the present invention;

[0026] Figure 4 Schematic diagram of the control unit structure in the present invention;

[0027] Figure 5 Schematic diagram of the locking and fastening device in the present invention;

[0028] Figure 6 Schematic diagram of the internal structure of the locking and fastening device in the present invention;

[0029] Figure 7 Schematic diagram of the arc-shaped locking snap ring structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the valve core main structure in the present invention;

[0031] Figure 9 Schematic diagram of the auxiliary sealing portion structure of the present invention;

[0032] Figure 10 It is a schematic diagram of the sealing valve core structure in the present invention.

[0033] In the figure: 1-stroke scale, 2-first sealing cover, 3-valve body, 4-valve core body, 5-push rod, 6-locking clamping device, 7-second sealing cover, 8-limiting clamping seat, 9-reset spring, 10-pneumatic actuator, 11-inlet pipe, 12-diaphragm chamber upper cavity, 13-diaphragm chamber lower cavity, 14-control part, 15-fixing bolt, 16-fixing nut, 17-electric terminal, 18-first electric push rod, 19-squeeze plate, 20-diaphragm, 21-extrusion limit spring, 22-limit frame, 23-locking part, 24-sliding moving column, 25-moving push-pull plate, 26-second electric push rod, 27-arc-shaped locking clamp, 28-auxiliary sealing part, 29-sealing valve core, 30-connecting plate, 31-rubber sheet, 32-rotating connecting shaft, 33-auxiliary extrusion sealing plate, 34-extrusion sealing spring, 35-connecting plate, 36-third electric push rod, 37-mounting hole, 38-mounting groove. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Example 1, as Figure 1As shown, a pneumatic diaphragm regulating valve of the present invention includes a stroke scale 1, a first sealing upper cover 2, a valve body 3, a valve core body 4, a push rod 5, a locking clamping device 6, a second sealing upper cover 7, a limit clamping seat 8, a reset spring 9 and a pneumatic actuator 10. The first sealing upper cover 2 is fixedly mounted on the upper end of the valve body 3 by bolts, the second sealing upper cover 7 is fixedly connected to the upper end of the first sealing upper cover 2 by bolts, the pneumatic actuator 10 is fixedly connected to the upper end of the second sealing upper cover 7, the limit clamping seat 8 is fixedly mounted inside the upper end of the second sealing upper cover 7, and the reset spring 9 is arranged at the limit Inside the card seat 8, the push rod 5 is slidably arranged in the middle of the first sealing cover 2 and the second sealing cover 7, the stroke scale 1 is arranged on the second sealing cover 7, the locking and fixing device 6 is arranged on the first sealing cover 2, the valve core body 4 is fixedly connected to the bottom end of the push rod 5, and the valve core body 4 is located inside the valve body 3. By providing the control unit 14 and the locking and fixing device 6, the push rod 5 can be automatically locked and the extrusion force compensation adjustment can be performed, so that the push rod 5 can always stably squeeze the valve core body 4 for a long time, so that the valve core body 4 can seal and block the middle of the valve body 3 for a long time;

[0036] like Figure 2 、 Figure 3 and Figure 4 As shown, the pneumatic actuator 10 includes an air inlet pipe 11, an upper cavity 12 of the membrane chamber, a lower cavity 13 of the membrane chamber, a control unit 14 and a fixing bolt 15. The air inlet pipe 11 is symmetrically fixed on the upper cavity 12 of the membrane chamber, and the control unit 14 is fixed between the upper cavity 12 of the membrane chamber and the lower cavity 13 of the membrane chamber by the fixing bolt 15. The control unit 14 is located inside the upper cavity 12 of the membrane chamber and the lower cavity 13 of the membrane chamber. The control unit 14 includes a fixing nut 16, an electrical terminal 17, a first electric push rod 18, an extrusion disk 19, a diaphragm 20 and an extrusion limit spring 21. The upper end of the push rod 5 is fixedly connected to the middle of the diaphragm 20 by the fixing nut 16. The extrusion limit spring 21 is evenly fixed to the diaphragm At the upper end of the diaphragm 20, the extrusion disk 19 is clamped on the upper end of the extrusion limit spring 21, the driving end of the first electric push rod 18 is fixedly connected to the upper end of the extrusion disk 19, the power terminal 17 is fixedly connected to the first electric push rod 18, and the power terminal 17 is fixedly arranged on the upper cavity 12 of the diaphragm chamber. The amount of gas entering the upper cavity 12 of the diaphragm chamber through the air inlet pipe 11 can be controlled to control the extrusion force and push on the diaphragm 20, so that the deformation of the diaphragm 20 can be controlled to move downward. The downward moving diaphragm 20 can push the push rod 5 and compress the reset spring 9, so that the downward moving push rod 5 can push the valve core body 4, so that the valve core body 4 seals the middle part of the valve body 3;

[0037] like Figure 5 、 Figure 6 and Figure 7As shown, the locking and fixing device 6 includes a limit frame 22 and a locking portion 23. The locking portion 23 is symmetrically arranged on the limit frame 22. The locking portion 23 includes a sliding column 24, a movable push-pull plate 25, a second electric push rod 26 and an arc-shaped locking clamp 27. The sliding column 24 is symmetrically fixedly installed in the middle of the movable push-pull plate 25. The arc-shaped locking clamp 27 is fixedly connected to the end of the sliding column 24 away from the movable push-pull plate 25. The second electric push rod 26 is distributed on the inner side of the movable push-pull plate 25, and the second electric push rod 26 is distributed on the inner side of the movable push-pull plate 25. The driving end of the push rod 26 is fixedly connected to the movable push-pull plate 25. After the push rod 5 moves downward, the externally arranged controller can control the second electric push rod 26 to operate. The operating second electric push rod 26 can move the arc-shaped locking clamp 27 by moving the push-pull plate 25 and the sliding movable column 24, so that the symmetrically distributed arc-shaped locking clamp 27 can clamp and lock the push rod 5. Therefore, when the valve body 3 needs to be sealed for a long time, the valve core body 4 will not be displaced, so that the long-term sealing effect is good.

[0038] like Figure 8 、 Figure 9 and Figure 10 As shown, the valve core body 4 includes an auxiliary sealing portion 28, a sealing valve core 29 and a connecting plate 30. The connecting plate 30 is fixedly connected to the upper end of the sealing valve core 29. The auxiliary sealing portion 28 is arranged on both sides of the sealing valve core 29. The auxiliary sealing portion 28 includes a rotating connecting shaft 32, an auxiliary extrusion sealing plate 33 and an extrusion sealing spring 34. The rotating connecting shaft 32 is fixedly arranged at the bottom end of the auxiliary extrusion sealing plate 33. The extrusion sealing spring 34 is evenly fixedly arranged on the inner side of the auxiliary extrusion sealing plate 33. The two sides of the sealing valve core 29 are fixedly connected to the auxiliary extrusion sealing plate 33 by the extrusion sealing spring 34, so that when the sealing valve core 29 squeezes the conveying groove set in the middle of the valve body 3, the auxiliary extrusion sealing plate 33 is fully brought into contact with the conveying groove, and the conveying groove is fully blocked. In addition, by controlling the third electric push rod 36 inside the sealing valve core 29, the front end of the push rod 36 is extended forward by a specified distance, so that the auxiliary extrusion sealing plate 33 can be squeezed and expanded outward, thereby achieving a better sealing effect.

[0039] Mounting holes 37 are provided on both sides of the sealing valve core 29, and a mounting groove 38 is provided at the bottom end of the sealing valve core 29. A third electric push rod 36 is fixedly installed inside both sides of the sealing valve core 29, and the connecting plate 35 is rotatably connected to the driving end of the third electric push rod 36, and the connecting plate 35 can be pushed to move by the third electric push rod 36.

[0040] The diaphragm 20 is located between the upper chamber 12 and the lower chamber 13 of the membrane chamber, and the fixing bolts 15 are threadedly fixed between the upper chamber 12 and the lower chamber 13 of the membrane chamber and the edge of the diaphragm 20 to play a role of fixed connection.

[0041] A pressure sensor is fixedly installed inside the upper end of the upper cavity 12 of the membrane chamber to play the role of pressure detection. The upper part of the push rod 5 is extruded and set on the upper end of the reset spring 9. The limit frame 22 is fixedly installed on the first sealing upper cover 2. The sealing valve core 29 seals the valve body 3. The bottom end of the push rod 5 is fixedly connected to the middle part of the upper end of the connecting plate 30. The rotating connecting shaft 32 is rotatably engaged in the inside of the mounting groove 38. The extrusion sealing spring 34 is fixedly installed inside the mounting hole 37. The connecting plate 35 is connected to the inner side of the auxiliary extrusion sealing plate 33 to play the role of adjustment.

[0042] The working principle of Example 1 is as follows: by controlling the amount of gas entering the upper cavity 12 of the diaphragm chamber through the air inlet pipe 11, the squeezing force and pushing force on the diaphragm 20 can be controlled, thereby causing the diaphragm 20 to deform and move downward. The downwardly moving diaphragm 20 can push the push rod 5 and compress the return spring 9, so that the downwardly moving push rod 5 can push the valve core body 4, so that the valve core body 4 seals the middle part of the valve body 3;

[0043] When the push rod 5 moves downward, the external controller can control the second electric push rod 26 to operate. The operating second electric push rod 26 can move the push-pull plate 25 and the sliding movable column 24 to move the arc-shaped locking clamping ring 27, so that the symmetrically distributed arc-shaped locking clamping ring 27 can clamp and lock the push rod 5. When the valve body 3 needs to be sealed for a long time, the valve core body 4 will not be displaced, so that the long-term sealing effect is good.

[0044] A pressure sensor is fixedly installed inside the upper end of the upper cavity 12 of the diaphragm chamber. When the internal pressure of the upper cavity 12 of the diaphragm chamber becomes smaller, the external controller can control the operation of the first electric push rod 18, so that the first electric push rod 18 pushes the extrusion disk 19 and the extrusion limit spring 21, thereby supplementing the pressure on the diaphragm 20 through the extrusion limit spring 21, so that when the air pressure inside the upper cavity 12 of the diaphragm chamber changes, the diaphragm 20 can maintain sufficient deformation displacement, so that the valve core body 4 can always be squeezed stably to seal the middle part of the valve body 3;

[0045] The two sides of the sealing valve core 29 are fixedly connected to the auxiliary extrusion sealing plate 33 by the extrusion sealing spring 34, so that when the sealing valve core 29 squeezes the conveying groove set in the middle of the valve body 3, the auxiliary extrusion sealing plate 33 is fully in contact with the conveying groove, and the conveying groove is fully blocked. In addition, by controlling the third electric push rod 36 inside the sealing valve core 29, its front end is extended forward by a specified distance, so that the auxiliary extrusion sealing plate 33 can be squeezed and expanded outward, thereby achieving a better sealing effect.

[0046] Example 2, based on Example 1, Figure 9 As shown, the outer end surface of the auxiliary extrusion sealing plate 33 is fixedly connected to the rubber sheet 31 .

[0047] When implementing this embodiment, by fixing the rubber sheet 31 on the outer end face of the auxiliary extrusion sealing plate 33, when the sealing valve core 29 squeezes the auxiliary extrusion sealing plate 33 to seal and block the middle part of the valve body 3, the middle part of the valve body 3 can be completely sealed, thereby achieving a better sealing effect.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic diaphragm regulating valve, comprising a stroke scale (1), a first sealing cover (2), a valve body (3), a valve core body (4), a push rod (5), a locking and fixing device (6), a second sealing cover (7), a limit seat (8), a return spring (9) and a pneumatic actuator (10), characterized in that: The first sealing cover (2) is fixedly mounted on the upper end of the valve body (3) by means of bolts, the second sealing cover (7) is fixedly connected to the upper end of the first sealing cover (2) by means of bolts, the pneumatic actuator (10) is fixedly connected to the upper end of the second sealing cover (7), the limit clamp (8) is fixedly mounted inside the upper end of the second sealing cover (7), the return spring (9) is arranged inside the limit clamp (8), the push rod (5) is slidably arranged in the middle of the first sealing cover (2) and the second sealing cover (7), the travel scale (1) is arranged on the second sealing cover (7), and the locking clamping device (6) is arranged on the upper end of the second sealing cover (7). On the first sealing upper cover (2), the valve core body (4) is fixedly connected to the bottom end of the push rod (5), and the valve core body (4) is located inside the valve body (3); the pneumatic actuator (10) includes an air inlet pipe (11), an upper cavity of the membrane chamber (12), a lower cavity of the membrane chamber (13), a control unit (14) and a fixing bolt (15); the air inlet pipe (11) is symmetrically fixed on the upper cavity of the membrane chamber (12); the control unit (14) is fixed between the upper cavity of the membrane chamber (12) and the lower cavity of the membrane chamber (13) through the fixing bolt (15), and the control unit (14) is located inside the upper cavity of the membrane chamber (12) and the lower cavity of the membrane chamber (13); The control part (14) includes a fixing nut (16), an electrical terminal (17), a first electric push rod (18), an extrusion disk (19), a diaphragm (20) and an extrusion limit spring (21), the upper end of the push rod (5) is fixedly connected to the middle of the diaphragm (20) through the fixing nut (16), the extrusion limit spring (21) is evenly fixedly connected to the upper end of the diaphragm (20), the extrusion disk (19) is clamped on the upper end of the extrusion limit spring (21), the driving end of the first electric push rod (18) is fixedly connected to the upper end of the extrusion disk (19), the electrical terminal (17) is fixedly connected to the first electric push rod (18), and the electrical terminal (17) is fixedly arranged on the upper cavity (12) of the diaphragm chamber; The locking and fastening device (6) includes a limit frame (22) and a locking portion (23), wherein the locking portion (23) is symmetrically arranged on the limit frame (22), and the locking portion (23) includes a sliding column (24), a movable push-pull plate (25), a second electric push rod (26) and an arc-shaped locking snap ring (27), wherein the sliding column (24) is symmetrically fixedly installed in the middle of the movable push-pull plate (25), and the arc-shaped locking snap ring (27) is fixedly connected to one end of the sliding column (24) away from the movable push-pull plate (25), and the second electric push rod (26) is distributed on the inner side of the movable push-pull plate (25), and the driving end of the second electric push rod (26) is fixedly connected to the movable push-pull plate (25).

2. The pneumatic diaphragm regulating valve according to claim 1, characterized in that: The valve core body (4) includes an auxiliary sealing portion (28), a sealing valve core (29) and a connecting plate (30), wherein the connecting plate (30) is fixedly connected to the upper end of the sealing valve core (29), and the auxiliary sealing portion (28) is arranged on both sides of the sealing valve core (29). The auxiliary sealing portion (28) includes a rotating connecting shaft (32), an auxiliary extrusion sealing plate (33) and an extrusion sealing spring (34), wherein the rotating connecting shaft (32) is fixedly arranged at the bottom end of the auxiliary extrusion sealing plate (33), and the extrusion sealing spring (34) is evenly fixedly arranged on the inner side of the auxiliary extrusion sealing plate (33); Mounting holes (37) are provided on both sides of the sealing valve core (29), a mounting groove (38) is provided at the bottom end of the sealing valve core (29), a third electric push rod (36) is fixedly installed inside both sides of the sealing valve core (29), and a connecting plate (35) is rotatably connected to the driving end of the third electric push rod (36); The diaphragm (20) is located between the upper cavity (12) and the lower cavity (13) of the diaphragm chamber, and the fixing bolt (15) is threadedly fixed between the upper cavity (12) and the lower cavity (13) of the diaphragm chamber and the edge of the diaphragm (20); a pressure sensor is fixedly installed inside the upper end of the upper cavity (12) of the diaphragm chamber.

3. The pneumatic diaphragm regulating valve according to claim 2, characterized in that: The upper portion of the push rod (5) is pressed against the upper end of the return spring (9).

4. The pneumatic diaphragm regulating valve according to claim 3, characterized in that: The limiting frame (22) is fixedly mounted on the first sealing upper cover (2).

5. The pneumatic diaphragm regulating valve according to claim 4, characterized in that: The sealing valve core (29) seals the valve body (3).

6. The pneumatic diaphragm regulating valve according to claim 5, characterized in that: The bottom end of the push rod (5) is fixedly connected to the middle portion of the upper end of the connecting plate (30).

7. The pneumatic diaphragm regulating valve according to claim 6, characterized in that: The rotating connecting shaft (32) is rotatably engaged in the interior of the mounting groove (38).

8. The pneumatic diaphragm regulating valve according to claim 7, characterized in that: The extrusion sealing spring (34) is fixedly mounted inside the mounting hole (37), and the connecting plate (35) is connected to the inner side of the auxiliary extrusion sealing plate (33).

9. The pneumatic diaphragm regulating valve according to claim 8, characterized in that: The outer end surface of the auxiliary extrusion sealing plate (33) is fixedly connected to a rubber sheet (31).

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