Pneumatic diaphragm actuator for gate valve

Abstract

The utility model relates to the technical field of pneumatic diaphragm actuators, and discloses a pneumatic diaphragm actuator for a gate valve, which comprises a valve body, a valve cover mounted at the top of the valve body and a valve plate mounted at the top of the valve body, a valve rod is mounted at the top of the valve plate, a packing is arranged on the side wall of the valve rod, and the valve cover is mounted on the valve plate. A third bolt is installed at the top of the valve deck, a nut is installed on the side wall of the third bolt in a threaded mode, a grease injection valve is fixedly installed on the side wall of the valve deck, a sealing gland is installed at the top of the valve deck, and an upper check ring is installed on the side wall of the sealing gland. The pneumatic diaphragm driver solves the problems that pneumatic diaphragm drivers in the current market are mostly used for adjusting valves, have the limitations of low control pressure, small driving force and short driving stroke, and cannot be directly used for flat gate valves on Christmas trees, and pneumatic diaphragm driving gate valves in the prior art cannot be disassembled and maintained under the state that the gate valves are under pressure, and are inconvenient to use. And great inconvenience is brought to practical application.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic diaphragm actuator technical field, concretely is a kind of pneumatic diaphragm actuator for gate valve. BACKGROUND

[0002] Valve is the control component in fluid conveying system, with the functions of guiding flow, intercepting flow, adjusting, throttling, preventing backflow, shunting or overflow unloading, etc., flat gate valve usually has symmetrical outlet and inlet at both ends, and has cavity for the upward and downward movement of gate to close and open the valve. Gate valves have been used to control various fluids for centuries, in the oil industry, gate valves are used in various positions of pipelines, one particular use is on a Christmas tree used in drilling and production operations, the driving mode of gate valve opening and closing is generally manual driving, pneumatic diaphragm driving, pneumatic piston driving and hydraulic piston driving, etc., the driving device generally includes valve cover assembly connected and sealed with valve body, valve stem driving gate movement and driver, pneumatic diaphragm driving has the advantages of high automation degree and high safety performance compared with manual driving, has the advantages of low control pressure, convenient pressure source acquisition compared with hydraulic driving, and has the advantages of low cost and not easy to jam compared with pneumatic piston;

[0003] At present, pneumatic diaphragm driver on the market is mainly used for regulating valve, which has the limitations of low control pressure, small driving force and short driving stroke, and cannot be directly used for flat gate valve on Christmas tree, the pneumatic diaphragm driving gate valve of prior art cannot be disassembled and maintained under the condition of gate valve pressure, which brings great inconvenience to actual application. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of pneumatic diaphragm actuator for gate valve, to achieve the purpose of solving the problem proposed in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of pneumatic diaphragm actuator for gate valve, including valve body,

[0006] Valve cover is installed in the top position of the valve body;

[0007] Valve plate is installed in the top of the valve body;

[0008] Valve rod is installed in the top position of the valve plate, packing is arranged in the side wall position of the valve rod, bolt three is installed in the top of the valve cover, nut is threadedly installed in the side wall of the bolt three, grease injection valve is fixedly installed in the side wall of the valve cover.

[0009] Preferably, a sealing gland is installed on the top of the valve cover, an upper retaining ring is installed on the side wall of the sealing gland, a lower cylinder head is installed on the side wall of the upper retaining ring, a clamp is installed on the side wall of the lower cylinder head, a spring is provided on the inner wall of the clamp, a screw is installed on the side wall of the clamp, a spring cavity is installed at the top of the screw, a lower cover is fixedly installed on the top of the spring cavity, an upper cover is contacted at the top of the lower cover, a bolt is installed on the inner wall of the upper cover, a nut is threaded on the side wall of the bolt, a plug is installed on the top side wall of the upper cover, a safety valve is installed on the top of the upper cover, an upper connector is installed at the top of the upper cover, and a valve cover sealing ring is provided on the inner wall of the valve cover.

[0010] Preferably, an upper cover body two is installed on the side wall of the upper rod retainer one, a lower cover body two is disposed at the bottom of the upper cover body two, a bolt two is rotatably installed on the side wall of the lower cover body two, a nut two is threaded on the side wall of the bolt two, a vent is fixedly installed on the top of the upper cover body two, a safety valve one is fixedly installed on the top left side wall of the upper cover body two, an upper connector two is fixedly installed on the upper cover body two, a sealing ring two is fixedly installed on the inner wall of the upper connector two, an upper rod sealing sleeve two is fixedly installed on the top of the sealing ring two, and an upper rod one is disposed on the inner wall of the upper rod sealing sleeve two.

[0011] Preferably, a sealing ring is installed on the inner wall of the upper cover body two, a sealing ring three is installed on the inner wall of the sealing ring, a diaphragm one is installed on the side wall of the sealing ring three, and a locking nut one is provided at the bottom position of the sealing ring three.

[0012] Preferably, a diaphragm 2 is installed on the inner wall of the upper cover 1, an upper rod 2 is installed on the side wall of the diaphragm 2, an O-ring is provided on the side wall of the upper rod 2, a diaphragm support plate 2 is fixedly installed at the bottom of the diaphragm 2, an upper rod retainer 2 is provided at the top of the diaphragm 2, a spring cover is provided at the bottom of the diaphragm support plate 2, and a locking nut 2 is provided at the bottom of the spring cover.

[0013] Preferably, the bottom of the clamp is provided with a screw two, a sealing ring one is installed on the side wall of the upper connector one, an upper rod sealing sleeve one is installed on the side wall of the sealing ring one, a lower cylinder head two is installed on the top of the upper rod sealing sleeve one, and a spring cavity two is provided inside the lower cylinder head two.

[0014] Preferably, a spring 2 is installed on the inner wall of the lower cylinder head 2, a diaphragm support plate 1 is fixedly installed on the top of the spring 2, and an upper rod retainer 1 is installed on the side wall of the diaphragm support plate 1.

[0015] This utility model provides a pneumatic diaphragm actuator for gate valves. It has the following advantages:

[0016] (1) This utility model reduces machining difficulty by eliminating the mechanical connection between the connecting rod and the piston, enabling its application in high-pressure, long-stroke, and high-driving-force parallel and expansion gate valves. It allows for easy disassembly and maintenance of the pneumatic diaphragm drive device even when the flat gate valve is pressurized. This reduces costs and improves work efficiency, solving the problem that current pneumatic diaphragm actuators are mostly used in regulating valves, which have limitations such as low control pressure, small driving force, and short driving stroke, making them unsuitable for direct use on flat gate valves on oil wellheads. Furthermore, existing pneumatic diaphragm-driven gate valves cannot be disassembled and maintained when the gate valve is pressurized, causing significant inconvenience in practical applications. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the pneumatic diaphragm drive device for a flat gate valve according to this utility model.

[0018] Fig. 2 This is a schematic diagram of the pneumatic diaphragm drive device for the flat gate valve of this utility model in its disassembled state.

[0019] Fig. 3 This is a cross-sectional structural schematic diagram of the pneumatic diaphragm drive device for the flat gate valve of this utility model.

[0020] In the diagram: 1. Valve body; 2. Valve plate; 3. Valve stem; 4. Packing; 5. Valve cover; 6. Sealing gland; 7. Upper retaining ring; 8. Lower cylinder head 1; 9. Clamp; 10. Screw 1; 11. Spring cavity 1; 12. Spring 1; 13. Lower cover 1; 14. Nut 1; 15. Bolt 1; 16. Upper cover 1; 17. O-ring; 18. Plug; 19. Upper connector 1; 20. Sealing ring 1; 21. Upper rod sealing sleeve 1; 22. Lower cylinder head 2; 23. Spring 2; 24. Diaphragm support plate 1; 25. Upper rod retainer 1; 26. Upper cover 2; 27. Vent port; 28. Seal 29. Upper rod sealing sleeve 2; 30. Upper rod 1; 31. Upper connector 2; 32. Safety valve 1; 33. Sealing ring; 34. Sealing ring 3; 35. Diaphragm 1; 36. Bolt 2; 37. Nut 2; 38. Lower cover 2; 39. Locking nut 1; 40. Spring cavity 2; 41. Bolt 1; 42. Safety valve 2; 43. Diaphragm 2; 44. Upper rod 2; 45. Diaphragm support plate 2; 46. Upper rod retainer 2; 47. Spring cover; 48. Locking nut 2; 49. Screw 2; 50. Bolt 3; 51. Nut; 52. Grease injection valve; 53. Valve cover sealing ring. Detailed Implementation

[0021] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0022] This utility model provides a pneumatic diaphragm actuator for a gate valve, as shown in the example below. Figs. 1 to 3 As shown: A pneumatic diaphragm actuator for a gate valve, comprising a valve body 1,

[0023] Valve cover 5 is installed at the top of valve body 1;

[0024] Valve plate 2 is installed on top of valve body 1;

[0025] A valve stem 3 is installed on the top of the valve plate 2, and a packing 4 is provided on the side wall of the valve stem 3. A bolt 3 50 is installed on the top of the valve cover 5, and a nut 51 is threaded on the side wall of the bolt 3 50. A grease injection valve 52 is fixedly installed on the side wall of the valve cover 5.

[0026] A sealing gland 6 is installed on the top of the valve cover 5. An upper retaining ring 7 is installed on the side wall of the sealing gland 6. A lower cylinder head 8 is installed on the side wall of the upper retaining ring 7. A clamp 9 is installed on the side wall of the lower cylinder head 8. A spring 12 is installed on the inner wall of the clamp 9. A screw 10 is installed on the side wall of the clamp 9. A spring cavity 11 is installed at the top of the screw 10. A lower cover body 13 is fixedly installed on the top of the spring cavity 11. An upper cover body 16 is in contact with the top of the lower cover body 13. A bolt 15 is installed on the inner wall of the upper cover body 16. A nut 14 is threaded on the side wall of the bolt 15. A plug 18 is installed on the top side wall of the upper cover body 16. A safety valve 42 is installed on the top of the upper cover body 16. An upper connector 19 is installed at the top of the upper cover body 16. A valve cover sealing ring 53 is provided on the inner wall of the valve cover 5.

[0027] The upper rod retainer 25 has an upper cover 26 mounted on its side wall. The bottom of the upper cover 26 is in contact with a lower cover 38. The side wall of the lower cover 38 is rotatably mounted with a bolt 36. The side wall of the bolt 36 is threaded with a nut 37. The top of the upper cover 26 is fixedly mounted with a vent 27. The top left side wall of the upper cover 26 is fixedly mounted with a safety valve 32. The upper cover 26 is fixedly mounted with an upper connector 31. The inner wall of the upper connector 31 is fixedly mounted with a sealing ring 28. The top of the sealing ring 28 is fixedly mounted with an upper rod sealing sleeve 29. The inner wall of the upper rod sealing sleeve 29 is provided with an upper rod 30.

[0028] A sealing ring 33 is installed on the inner wall of the upper cover 26, a sealing ring 34 is installed on the inner wall of the sealing ring 33, a diaphragm 35 is installed on the side wall of the sealing ring 34, and a locking nut 39 is provided at the bottom of the sealing ring 34.

[0029] A diaphragm 43 is installed on the inner wall of the upper cover 16. An upper rod 44 is installed on the side wall of the diaphragm 43. An O-ring 17 is provided on the side wall of the upper rod 44. A diaphragm support plate 45 is fixedly installed at the bottom of the diaphragm 43. An upper rod retainer 46 is provided at the top of the diaphragm 43. A spring cover 47 is provided at the bottom of the diaphragm support plate 45. A locking nut 48 is provided at the bottom of the spring cover 47.

[0030] The bottom of the clamp 9 is provided with screw 49, the side wall of the upper connector 19 is provided with sealing ring 20, the side wall of sealing ring 20 is provided with upper rod sealing sleeve 21, the top of upper rod sealing sleeve 21 is provided with lower cylinder head 22, and the inside of lower cylinder head 22 is provided with spring cavity 40.

[0031] A spring 23 is installed on the inner wall of the lower cylinder head 22. A diaphragm support plate 24 is fixedly installed on the top of the spring 23. An upper rod retainer 25 is installed on the side wall of the diaphragm support plate 24.

[0032] In the specific implementation process, the upper surface of diaphragm 35 is provided with a vulcanized metal ring at its center. The upper and lower end steps of the upper rod retainer 25 have sealing rings 33 that are sealed to the metal ring. Diaphragm 43 has a vulcanized woven fabric layer to provide diaphragm strength so that diaphragm 43 will not burst under high pressure. The upper cover 16 can be removed from the valve body 1. The upper rod 30 and upper rod 44 are installed in the upper cover 16. The upper rod sealing sleeve 21 can prevent contaminants from entering the annular space between the upper rod 30, upper rod 44 and the upper cover 16, thus protecting the seal. The sealing rings 20 and 28 can reduce the friction between the upper rod 44, upper rod 30 and the plug 18. This allows the upper rod 30 and upper rod 44 to move freely up and down. Diaphragm 35 is installed on diaphragm support plates 24 and 45, supporting the diaphragm. Diaphragm 35 and 45 are pressed between the flanges of upper cover 16 and upper cover 26 and lower cover 13 and lower cover 28 by bolts 15, bolts 36 and nuts 14 and 37. The gap between bolts 15, bolts 36 and nuts 14 and 37, diaphragm 35, safety valve 42 and the flanges of upper cover 16 and upper cover 26 is fixed so that when the upper sealing cavity is pressurized, diaphragm 43 and diaphragm 35 are also fixed. 35 will not be pulled out from between the flanges of the upper cover 16, upper cover 26 and lower cover 13, lower cover 28. Diaphragm 1 35 and diaphragm 2 43 are made of nitrile rubber. The lower part of the diaphragm is vulcanized with a woven fabric layer to improve the strength of diaphragm 1 35 and diaphragm 2 43 so that the diaphragm will not burst under high pressure. The pressure source enters through the plug 18, pushing diaphragm 1 35, diaphragm 2 43 and diaphragm support plate 1 24 and diaphragm support plate 2 45. Safety valve 1 32 and safety valve 2 42 on the other side are connected to safety valve 2 42. The set pressure is the maximum working pressure of the pneumatic diaphragm drive device so that when the pressure source is unstable and exceeds the maximum pressure, diaphragm 1 35 and diaphragm 2 43 will be activated by the plug 18. Compressed gas is injected into the top of the upper cover 16 and the upper cover 26 via plug 18 and vent 27. The compressed gas pushes the diaphragm 1 35, diaphragm 2 43, and diaphragm support plate 1 24 and diaphragm support plate 2 45 downward. The diaphragm support plate 1 24 and diaphragm support plate 2 45 push the upper rod 2 44. The upper rod 1 30 pushes the valve stem 3, which in turn pushes the valve plate 2 to open the valve body 1. At the same time, the upper rod 2 44 pushes the spring cover 47 downward to compress the spring 1 12 and spring 2 23, forming a compressive force. After the pressure is released from the plug 18 and vent 27, the spring 1 12 and spring 2 23 return to their original positions and push the diaphragm support plate 1 24 and diaphragm support plate 2 45 upward, which in turn drives the valve stem 3 and the valve plate 2 upward, thus closing the expansion valve body 1.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic diaphragm actuator for a gate valve, comprising a valve body (1). A valve cover (5) is installed at the top of the valve body (1); A valve plate (2) mounted on top of the valve body (1); characterized in that: A valve stem (3) is installed at the top of the valve plate (2), and a packing (4) is provided on the side wall of the valve stem (3). A bolt (50) is installed at the top of the valve cover (5), and a nut (51) is threaded on the side wall of the bolt (50). A grease injection valve (52) is fixedly installed on the side wall of the valve cover (5).

2. The pneumatic diaphragm actuator for a gate valve according to claim 1, characterized in that: A sealing cap (6) is installed on the top of the valve cover (5). An upper retaining ring (7) is installed on the side wall of the sealing cap (6). A lower cylinder head (8) is installed on the side wall of the upper retaining ring (7). A clamp (9) is installed on the side wall of the lower cylinder head (8). A spring (12) is provided on the inner wall of the clamp (9). A screw (10) is installed on the side wall of the clamp (9). A spring cavity (11) is installed at the top of the screw (10). A lower cover body (1) is fixedly installed on the top of the spring cavity (11). 3) The top of the lower cover (13) is connected to the upper cover (16), the inner wall of the upper cover (16) is fitted with a bolt (15), the side wall of the bolt (15) is threaded with a nut (14), the top side wall of the upper cover (16) is fitted with a plug (18), the top of the upper cover (16) is fitted with a safety valve (42), the top of the upper cover (16) is fitted with an upper connector (19), and the inner wall of the valve cover (5) is fitted with a valve cover sealing ring (53).

3. A pneumatic diaphragm actuator for a gate valve according to claim 2, characterized in that: The bottom of the clamp (9) is provided with screw two (49), the side wall of the upper connector one (19) is provided with sealing ring one (20), the side wall of the sealing ring one (20) is provided with upper rod sealing sleeve one (21), the top of the upper rod sealing sleeve one (21) is provided with lower cylinder head two (22), and the interior of the lower cylinder head two (22) is provided with spring cavity two (40).

4. A pneumatic diaphragm actuator for a gate valve according to claim 3, characterized in that: The inner wall of the lower cylinder head 2 (22) is equipped with a spring 2 (23), the top of the spring 2 (23) is fixedly equipped with a diaphragm support plate 1 (24), and the side wall of the diaphragm support plate 1 (24) is equipped with an upper rod retainer 1 (25).

5. A pneumatic diaphragm actuator for a gate valve according to claim 4, characterized in that: The upper rod retainer 1 (25) is equipped with an upper cover 2 (26) on its side wall. The bottom of the upper cover 2 (26) is in contact with a lower cover 2 (38). The side wall of the lower cover 2 (38) is rotatably equipped with a bolt 2 (36). The side wall of the bolt 2 (36) is threaded with a nut 2 (37). The top of the upper cover 2 (26) is fixedly equipped with a vent (27). The top left side wall of the upper cover 2 (26) is fixedly equipped with a safety valve 1 (32). The upper cover 2 (26) is fixedly equipped with an upper connector 2 (31). The inner wall of the upper connector 2 (31) is fixedly equipped with a sealing ring 2 (28). The top of the sealing ring 2 (28) is fixedly equipped with an upper rod sealing sleeve 2 (29). The inner wall of the upper rod sealing sleeve 2 (29) is provided with an upper rod 1 (30).

6. A pneumatic diaphragm actuator for a gate valve according to claim 5, characterized in that: The inner wall of the upper cover body 2 (26) is equipped with a sealing ring (33), the inner wall of the sealing ring (33) is equipped with a sealing ring 3 (34), the side wall of the sealing ring 3 (34) is equipped with a diaphragm 1 (35), and a locking nut 1 (39) is provided at the bottom of the sealing ring 3 (34).

7. A pneumatic diaphragm actuator for a gate valve according to claim 2, characterized in that: The inner wall of the upper cover (16) is fitted with a diaphragm (43), the side wall of the diaphragm (43) is fitted with an upper rod (44), the side wall of the upper rod (44) is fitted with an O-ring (17), the bottom of the diaphragm (43) is fixedly fitted with a diaphragm support plate (45), the top of the diaphragm (43) is fitted with an upper rod retainer (46), the bottom of the diaphragm support plate (45) is fitted with a spring cap (47), and the bottom of the spring cap (47) is fitted with a locking nut (48).

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