Valve actuator

Abstract

This invention discloses a valve actuator, comprising: a first actuator and a second actuator. The first actuator is disposed above the second actuator, and a mounting assembly is disposed below the second actuator. The mounting assembly is used to connect a pipeline. The first actuator and the second actuator are respectively provided with a closed execution chamber and an open execution chamber, which are connected. An execution block is disposed within each of the closed and open execution chambers. One end of the execution block near the mounting assembly is used to open or close the pipeline connection. The lower part of the execution block slides along the circumferential outer wall of the pipeline. Adjusting blocks are spaced apart on the upper part of the execution block, and the adjusting blocks are used to adjust the moving distance of the execution block. The execution block slides within the closed and open execution chambers, thereby causing the lower part of the execution block to slide along the outer wall of the pipeline. By adjusting the moving distance of the execution block using the adjusting blocks, the purpose of adjusting the opening and closing degree of the pipeline is achieved.

Description

Technical Field

[0001] This invention relates to the field of valve actuator technology, specifically to a valve actuator. Background Technology

[0002] A valve actuator is a mechanical component used to control the opening or closing of a valve. It is commonly used in industrial automation control systems. A valve actuator provides a way to convert control signals into valve displacement or torque. By controlling the movement of the actuator, precise control of the valve can be achieved. Valve actuators are usually installed on valves and are classified into manual actuators, electric actuators, hydraulic actuators, and pneumatic actuators, depending on the different control signals.

[0003] Valve actuators can control the valve from fully closed to fully open, and can also adjust the intermediate position. They are an important component for achieving automated control and are widely used in petrochemical, chemical, water conservancy, energy, pharmaceutical and food industries.

[0004] However, the current pneumatic valve actuators have a limited adjustment range and cannot achieve multi-level adjustment, resulting in low flow controllability;

[0005] For example, Chinese patent CN 212178015 U discloses a pneumatic valve actuator, which includes a valve, a bracket and a body. An air compressor is provided in the middle of the top of the body. The air compressor has exhaust ports at the bottom and on the left and right sides. A cylinder is provided horizontally in the middle of the body. The cylinder has air inlets at the top and on the left and right sides. The exhaust ports are connected to the air inlets through air pipes. A controller and a capacitor are provided on the left and right sides below the body, respectively. A movable groove is provided in the bracket in the longitudinal direction. An output shaft is inserted into the movable groove in the longitudinal direction. A gear, a piston rod and a piston are arranged in sequence from the inside to the outside of the cylinder. A shaft groove is provided in the bottom of the cylinder in the longitudinal direction. The top of the output shaft passes through the shaft groove and is connected to the bottom of the gear. The capacitor is electrically connected to the controller and the air compressor.

[0006] In the aforementioned patent, the capacitor is controlled by the circuit inside the controller to ensure the normal operation of the air compressor in the power-off state. The stability of the valve actuator is achieved by improving the stability of the air source. However, the valve actuator does not have the function of flow regulation and only has the effect of connecting and disconnecting the pipeline, which limits its scope of application.

[0007] Therefore, a valve actuator that can improve the stability of flow regulation is needed. Summary of the Invention

[0008] The purpose of this invention is to provide a valve actuator to solve the technical problem of low flow regulation stability of pneumatic valve actuators mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A valve actuator includes: a first actuator and a second actuator. The first actuator is disposed above the second actuator, and a mounting assembly is disposed below the second actuator. The mounting assembly is used to connect a pipeline. The first actuator and the second actuator are respectively provided with a closed execution chamber and an open execution chamber. The closed execution chamber and the open execution chamber are connected. An execution block is disposed in the closed execution chamber and the open execution chamber. One end of the execution block near the mounting assembly is used to open or close the pipeline connection. The lower part of the execution block slides along the circumferential outer wall of the pipeline. Adjusting blocks are disposed at intervals on the upper part of the execution block. The adjusting blocks are used to adjust the moving distance of the execution block.

[0011] Preferably, the installation assembly includes a connecting body, which is provided with an input pipe and an output pipe. One end of the input pipe and the output pipe are respectively used to connect to a second actuator. The lower part of the second actuator is provided with a receiving chamber, the upper part of the receiving chamber is connected to the opening execution chamber, a mating part is provided in the receiving chamber, the bottom of the mating part is connected to the output pipe, and the execution block is slidably disposed on the upper circumferential outer wall of the mating part.

[0012] Preferably, the fitting component is a hollow tube, the upper end of which is closed and the lower end is connected to the output pipe. The outer circumferential wall of the end of the hollow tube away from the output pipe is provided with a plurality of through holes, each of which is arranged along the length of the hollow tube. A ring is provided on the outer circumferential wall of the end of the hollow tube near the output pipe. The inner wall of the ring is connected to the outer wall of the hollow tube. The bottom surface of the ring is connected to the bottom surface of the receiving chamber. A first sealing ring is provided on the top surface of the ring. The first sealing ring is sleeved on the outer circumferential wall of the bottom end of the hollow tube.

[0013] Preferably, the closed execution chamber and the open execution chamber form an adjustment chamber. The adjustment chamber is a cylindrical structure, and the length of the cylindrical structure is slidably arranged parallel to the length of the hollow tube. The execution block is arranged along the length of the adjustment chamber. The upper part of the execution block is the closed execution chamber, and the lower part is the open execution chamber. The bottom surface of the open execution chamber is provided with a first sliding hole, and the lower part of the execution block slides in the first sliding hole. The top surface of the closed execution chamber is provided with a second sliding hole, and the upper part of the execution block slides in the second sliding hole.

[0014] Preferably, the actuator includes an actuator rod and a plugging ring. The inner wall of the plugging ring is connected to the outer circumferential wall of the middle part of the actuator rod. The outer wall of the plugging ring slides on the inner wall of the regulating chamber. A mating hole is provided on the lower end face of the actuator rod. The mating hole is provided along the length direction of the actuator rod. The inner wall of the mating hole is slidably connected to the outer circumferential wall of the hollow tube.

[0015] Preferably, the upper part of the actuator rod is provided with a slide table, which is slidably disposed inside a slide tube. The slide tube is disposed on the top surface of the closed actuator chamber. The upper end of the slide tube is connected to the top surface of the closed actuator chamber, and the lower end is disposed towards the hollow tube. A spring is also disposed inside the closed actuator chamber. One end of the spring is connected to the lower end face of the slide tube, and the other end of the spring is disposed near the upper part of the blocking ring. The spring is sleeved on the circumferential outer wall of the actuator rod, and the end of the spring near the slide tube is disposed near the lower part of the slide table.

[0016] Preferably, both the first actuator and the second actuator are cylindrical structures, and the outer circumferential walls of the first actuator and the second actuator are respectively provided with a first gas port and a second gas port, which are used to connect to a gas source.

[0017] Preferably, the adjusting block includes a pneumatic push rod, and multiple pneumatic push rods are provided. Each pneumatic push rod is arranged along the length direction of the actuator rod, and each pneumatic push rod is respectively arranged on the upper part of the boss.

[0018] Preferably, the pneumatic push rod is disposed inside the enclosed execution chamber, and each of the pneumatic push rods is arranged in a multi-layered annular structure on the circumferential outer wall of the execution rod, and the multi-layered annular structure is arranged along the length direction of the execution rod.

[0019] Preferably, each of the pneumatic push rods located at the same height is connected to a solenoid valve, with one end of each solenoid valve used to connect to the pneumatic push rod and the other end used to connect to an air source.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention provides a valve actuator, comprising: a first actuator and a second actuator, wherein the first actuator is disposed above the second actuator, and a mounting assembly is disposed below the second actuator for connecting a pipeline; the first actuator and the second actuator are respectively provided with a closed execution chamber and an open execution chamber, the closed execution chamber and the open execution chamber being in communication; an execution block is disposed within the closed execution chamber and the open execution chamber; one end of the execution block near the mounting assembly is used to open or close the pipeline connection; the lower part of the execution block slides along the circumferential outer wall of the pipeline; and adjusting blocks are spaced apart on the upper part of the execution block for adjusting the moving distance of the execution block.

[0022] When used to open or close the pipeline connection, the closed execution chamber in the first actuator is evacuated, and the open execution chamber in the second actuator is inflated. This pushes the actuator block from the open execution chamber to the closed execution chamber, causing the lower part of the actuator block to slide upwards from one end of the pipeline. The upper part of the pipeline is gradually opened, connecting the two pipelines. As the actuator block moves upwards, the adjusting block is gradually retracted, causing the adjusting block along the length of the actuator block to gradually retract. The actuator block can be suspended at different heights, gradually increasing the exposed space in the pipeline, thus achieving the purpose of adjusting the degree of pipeline opening and closing, and making the flow rate of the medium in the pipeline adjustable. When it is necessary to gradually close the pipeline connection, the closed execution chamber in the first actuator is inflated, and the open execution chamber in the second actuator is evacuated. This causes the actuator block to slide from the closed execution chamber into the open execution chamber, thereby blocking one end of the pipeline and achieving the purpose of closing the pipeline. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the valve actuator structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the valve actuator of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the pneumatic push rod of the present invention;

[0026] Figure 4 This is a schematic diagram of the mating component structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the execution block structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation of the first driving tube of the present invention;

[0029] Figure 7 This is a schematic diagram of the installation of the first sealing block of the present invention.

[0030] In the diagram: 1. First actuator; 2. Second actuator; 3. Mounting assembly; 4. Closed actuator chamber; 5. Open actuator chamber; 6. Actuator block; 7. Adjusting block; 8. Connecting body; 9. Input pipe; 10. Output pipe; 11. Receiving chamber; 12. Mating component; 13. Through hole; 14. Ring; 15. First sealing ring; 16. Adjusting chamber; 17. First sliding hole; 18. Second sliding hole; 19. Actuating rod; 20. Plug ring; 21. Mating hole; 22. Slide table; 23. Slide tube; 24. Spring; 25. First gas port; 26. Second gas port; 27. Pneumatic push rod; 28. Short pipe; 29. ​​Guide platform; 30. Conical guide plate; 31. First drive tube; 32. Second drive tube; 33. First sealing block; 34. Second sealing block; 35. First connecting rod; 36. Second connecting rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example 1

[0035] Please see Figure 1-5 A valve actuator includes: a first actuator 1 and a second actuator 2. The first actuator 1 is disposed above the second actuator 2. The second actuator 2 is provided with a mounting assembly 3 at its lower part. The mounting assembly 3 is used to connect a pipeline. The first actuator 1 and the second actuator 2 are respectively provided with a closed execution chamber 4 and an open execution chamber 5. The closed execution chamber 4 and the open execution chamber 5 are connected. An execution block 6 is provided in the closed execution chamber 4 and the open execution chamber 5. The end of the execution block 6 near the mounting assembly 3 is used to open and close the pipeline connection. The lower part of the execution block 6 slides along the circumferential outer wall of the pipeline. The upper part of the execution block 6 is provided with adjusting blocks 7 at intervals. The adjusting blocks 7 are used to adjust the moving distance of the execution block 6.

[0036] In the above embodiments, when used to open or close the connection of the pipeline, the closed execution chamber 4 in the first actuator 1 is evacuated, and the open execution chamber 5 in the second actuator 2 is inflated, thereby pushing the execution block 6 from the open execution chamber 5 into the closed execution chamber 4. This causes the lower part of the execution block 6 to slide upward from one end of the pipeline, and the upper part of the pipeline is gradually opened, connecting the two pipelines. As the execution block 6 moves upward, the adjusting block 7 is gradually retracted, causing the adjusting block 7 along the length direction of the execution block 6 to gradually retract. The execution block 6 can be suspended at different heights, gradually increasing the exposed space of the pipeline, thereby achieving the purpose of adjusting the degree of opening and closing of the pipeline and making the flow rate of the medium in the pipeline adjustable. When it is necessary to gradually close the connection of the pipeline, the closed execution chamber 4 in the first actuator 1 is inflated, and the open execution chamber 5 in the second actuator 2 is evacuated, causing the execution block 6 to slide from the closed execution chamber 4 into the open execution chamber 5. This causes the execution block 6 to block one end of the pipeline, thereby achieving the purpose of closing the pipeline.

[0037] Example 2

[0038] Please see Figure 1-5 The installation component 3 includes a connecting body 8, which has an input pipe 9 and an output pipe 10. One end of the input pipe 9 and the output pipe 10 are respectively used to connect to the second actuator 2. The second actuator 2 has a receiving chamber 11 at its lower part. The upper part of the receiving chamber 11 is connected to the opening execution chamber 5. The receiving chamber 11 has a mating part 12 inside. The bottom of the mating part 12 is connected to the output pipe 10. The execution block 6 is slidably disposed on the upper circumferential outer wall of the mating part 12.

[0039] In the above embodiment, both the input pipe 9 and the pipe are L-shaped structures. One end of the two L-shaped structures is parallel to each other, and the other end of the two L-shaped structures is vertical and points to the bottom surface of the receiving chamber 11. The input pipe 9 is located on one side of the output pipe 10. The mating part 12 is used to open and close the top of the output pipe 10. When the mating part 12 is separated from the execution block 6, the medium in the receiving chamber 11 enters the output pipe 10 and enters the output pipe 10 from the top of the output pipe 10, and is output from the output pipe 10.

[0040] Example 3

[0041] Please see Figure 1-5The fitting component 12 is a hollow tube, the upper end of which is closed and the lower end is connected to the output pipe 10. A plurality of through holes 13 are provided on the outer circumferential wall of the end of the hollow tube away from the output pipe 10. Each of the through holes 13 is arranged along the length direction of the hollow tube. A ring 14 is provided on the outer circumferential wall of the end of the hollow tube near the output pipe 10. The inner wall of the ring 14 is connected to the outer wall of the hollow tube. The bottom surface of the ring 14 is connected to the inner bottom surface of the receiving chamber 11. A first sealing ring 15 is provided on the top surface of the ring 14. The first sealing ring 15 is sleeved on the outer circumferential wall of the bottom end of the hollow tube.

[0042] In the above embodiment, a plurality of through holes 13 are provided on the circumferential outer wall of the upper end of the hollow tube for accommodating the medium input into the input pipe 9 in the chamber 11 into the hollow tube and out through the output pipe 10. The through holes 13 are arranged along the length of the hollow tube. When the execution block 6 moves upward, the through holes 13 on the surface of the hollow tube are gradually opened, thereby achieving the purpose of regulating the flow. The first closing ring is used to close the space between the execution block 6 and the ring 14 and to buffer the execution block 6.

[0043] Example 4

[0044] Please see Figure 1-5 The closed execution chamber 4 and the open execution chamber 5 together form an adjustment chamber 16. The adjustment chamber 16 is a cylindrical structure, and the length of the cylindrical structure is slidably arranged parallel to the length of the hollow tube. The execution block 6 is arranged along the length of the adjustment chamber 16. The upper part of the execution block 6 is the closed execution chamber 4, and the lower part is the open execution chamber 5. The bottom surface of the open execution chamber 5 is provided with a first sliding hole 17, and the lower part of the execution block 6 slides in the first sliding hole 17. The top surface of the closed execution chamber 4 is provided with a second sliding hole 18, and the upper part of the execution block 6 slides in the second sliding hole 18.

[0045] In the above embodiment, the execution block 6 slides within the regulating chamber 16. By closing the execution chamber 4 and opening the execution chamber 5 to allow air to be drawn in, the execution block 6 is driven to move, thereby achieving the purpose of the execution block 6 moving on the surface of the hollow tube.

[0046] Example 5

[0047] Please see Figure 1-5 The execution block 6 includes an execution rod 19 and a blocking ring 20. The inner wall of the blocking ring 20 is connected to the outer wall of the middle part of the execution rod 19. The outer wall of the blocking ring 20 slides on the inner wall of the regulating chamber 16. A mating hole 21 is provided on the lower end face of the execution rod 19. The mating hole 21 is provided along the length direction of the execution rod 19. The inner wall of the mating hole 21 is slidably connected to the outer wall of the hollow tube.

[0048] In the above embodiment, the plugging ring 20 is used to close the opening execution chamber 5 and the closing execution chamber 4, so that when the closing execution chamber 4 and the opening execution chamber 5 are filled and sucked, the plugging ring 20 drives the execution rod 19 to move. The mating hole 21 at the lower end of the execution rod 19 is used to set a hollow tube. When the execution rod 19 moves, the through hole 13 on the surface of the hollow tube is exposed, so as to accommodate the medium in the chamber 11 to enter the output pipe 10.

[0049] Example 6

[0050] Please see Figure 1-5 The actuator 19 is provided with a slide table 22 on its upper part. The slide table 22 is slidably disposed in the slide tube 23. The slide tube 23 is disposed on the top surface of the closed actuator chamber 4. The upper end of the slide tube 23 is connected to the top surface of the closed actuator chamber 4, and the lower end is disposed towards the hollow tube. The closed actuator chamber 4 is also provided with a spring 24. One end of the spring 24 is connected to the lower end face of the slide tube 23, and the other end of the spring 24 is disposed near the upper part of the blocking ring 20. The spring 24 is sleeved on the outer wall of the actuator 19. The end of the spring 24 near the slide tube 23 is disposed near the lower part of the slide table 22.

[0051] In the above embodiment, when the air source fills the closed execution chamber 4 and the open execution chamber 5 with air, the slide table 22 on the upper part of the execution rod 19 slides in the slide tube 23. The slide tube 23 plays a sliding limit role for the execution rod 19. When it is necessary to close the pipeline, the execution rod 19 blocks the output pipeline 10. At the same time, the spring 24 pushes the blocking ring 20, so that the execution rod 19 abuts against the top surface of the first closing ring.

[0052] Example 7

[0053] Please see Figure 1-5 Both the first actuator 1 and the second actuator 2 are cylindrical structures. The outer walls of the first actuator 1 and the second actuator 2 are respectively provided with a first gas port 25 and a second gas port 26, which are used to connect to a gas source.

[0054] In the above embodiments, the first gas port 25 and the second gas port 26 are used to close the execution chamber 4 and open the execution chamber 5 to connect the gas source.

[0055] Example 8

[0056] Please see Figure 1-5 The adjusting block 7 includes a pneumatic push rod 27. Multiple pneumatic push rods 27 are provided. Each pneumatic push rod 27 is arranged along the length direction of the actuator rod 19 and is respectively arranged on the upper part of the boss.

[0057] The pneumatic push rod 27 is disposed inside the closed execution chamber 4. Each pneumatic push rod 27 is arranged in a multi-layered annular structure on the outer circumference of the execution rod 19. The multi-layered annular structure is arranged along the length direction of the execution rod 19.

[0058] Each of the pneumatic push rods 27 located at the same height is connected to a solenoid valve. One end of each solenoid valve is used to connect to the pneumatic push rod 27, and the other end is used to connect to an air source.

[0059] In the above embodiment, the air source is activated to inflate the pneumatic push rod 27, so that the pneumatic push rod 27 supports the bottom surface of the blocking ring 20, thereby achieving the purpose of suspending the actuator 19.

[0060] Example 9

[0061] Please see Figure 1-7 The input pipe 9 has a guide channel at its end, which includes a short pipe 28. The short pipe 28 is located at the end of the input pipe 9 and is spaced apart from the input pipe 9. A guide platform 29 is provided inside the short pipe 28. One end of the guide platform 29 is hemispherical, and the other end is provided with a conical guide plate 30. The small-diameter end of the conical guide plate 30 is connected to the guide platform 29. The conical guide plate 30 is located at the end away from the short pipe 28 and is located outside the short pipe 28. The end of the guide platform 29 near the hemispherical part is located inside the short pipe 28. A manual closing assembly is provided inside the short pipe 28 and the guide platform 29. The manual closing assembly includes a first drive pipe 31 and a second drive pipe 32. A drive tube 32 is provided, with the first drive tube 31 sleeved outside the second drive tube 32. The bottom ends of the first drive tube 31 and the second drive tube 32 are located near the upper part of the conical plate. The first drive tube 31 and the second drive tube 32 pass through the first actuator 1 and the second actuator 2. A first sealing block 33 is provided on the circumferential outer wall of the bottom end of the first drive tube 31. Multiple first sealing blocks 33 are provided. Two first connecting rods 35 are spaced apart between the multiple first sealing blocks 33 and the first drive tube 31. The two first connecting rods 35 form a parallelogram structure with the outer wall of the first drive tube 31 and the outer wall of the first sealing block 33. The two ends of the first connecting rod 35 are respectively hinged to the first drive tube 31 and the first sealing block 33.

[0062] Multiple second sealing blocks 34 are spaced apart on the outer circumferential wall of the bottom end of the second drive tube 32. Each second sealing block 34 is respectively disposed between two adjacent first sealing blocks 33. Two second rods are disposed between the second sealing block 34 and the second drive tube 32. The second connecting rod 36 forms a parallelogram structure with the second sealing block 34 and the second drive tube 32. The two ends of the second connecting rod 36 are respectively hinged to the second drive tube 32 and the second sealing block 34.

[0063] In the above embodiment, when a gas source failure prevents the pipeline from closing, the first drive pipe 31 is pushed, causing the first drive pipe 31 to move the first sealing block 33 downward through the two second connecting rods 36. This causes the first sealing block 33 to block the gap between the short pipe 28 and the input pipe 9. The gap between each first sealing block 33 is used to adjust the flow rate. Subsequently, when the gap is completely closed, the second drive pipe 32 is pushed, causing the second drive pipe 32 to move the second sealing block 34 downward through the second connecting rod 36. This causes the second sealing block 34 to block the gap between each first sealing block 33, thereby achieving the purpose of completely sealing the input pipe 9.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A valve actuator, characterized in that, include: A first actuator (1) and a second actuator (2) are provided. The first actuator (1) is located on the upper part of the second actuator (2). The lower part of the second actuator (2) is provided with an installation component (3). The installation component (3) is used to connect the pipeline. The first actuator (1) and the second actuator (2) are respectively provided with a closed execution chamber (4) and an open execution chamber (5). The closed execution chamber (4) and the open execution chamber (5) are connected. The closed execution chamber (4) and the open execution chamber (5) are provided with an execution block (6). The end of the execution block (6) near the installation component (3) is used to open and close the pipeline connection. The lower part of the execution block (6) slides along the outer wall of the pipeline. The upper part of the execution block (6) is provided with an adjustment block (7) at intervals. The adjustment block (7) is used to adjust the moving distance of the execution block (6). The installation component (3) includes a connecting body (8), an input pipe (9) and an output pipe (10) are provided inside the connecting body (8), one end of the input pipe (9) and the output pipe (10) are respectively used to connect to the second actuator (2), the lower part of the second actuator (2) is provided with a receiving chamber (11), the upper part of the receiving chamber (11) is connected to the opening execution chamber (5), a mating part (12) is provided inside the receiving chamber (11), the bottom of the mating part (12) is connected to the output pipe (10), and an execution block (6) is slidably provided on the upper circumferential outer wall of the mating part (12); The input pipe (9) is provided with a guide channel at its end. The guide channel includes a short pipe (28). The short pipe (28) is provided at the end of the input pipe (9) and is spaced apart from the input pipe (9). A manual closing assembly is provided inside the short pipe (28). The manual closing assembly includes a first drive pipe (31) and a second drive pipe (32). The first drive pipe (31) is sleeved outside the second drive pipe (32). The first drive pipe (31) and the second drive pipe (32) pass through the first actuator (1) and the second actuator (28). The actuator (2) is provided with a first sealing block (33) on the outer wall of the bottom end of the first drive tube (31). Multiple first sealing blocks (33) are provided. Two first connecting rods (35) are provided between the first sealing block (33) and the first drive tube (31) at intervals. The two first connecting rods (35) form a parallelogram structure with the outer wall of the first drive tube (31) and the outer wall of the first sealing block (33). The two ends of the first connecting rod (35) are respectively hinged to the first drive tube (31) and the first sealing block (33). The bottom circumferential outer wall of the second drive tube (32) is provided with a plurality of second sealing blocks (34) spaced apart. Each second sealing block (34) is respectively disposed between two adjacent first sealing blocks (33). Two second connecting rods are provided between the second sealing block (34) and the second drive tube (32). The second connecting rod (36) forms a parallelogram structure with the second sealing block (34) and the second drive tube (32). The two ends of the second connecting rod (36) are respectively hinged to the second drive tube (32) and the second sealing block (34). When the gas source fails and the pipeline cannot be closed, the first drive tube (31) is pushed, so that the first drive tube (31) drives the first sealing block (33) to move down through the two second connecting rods (36), so that the first sealing block (33) blocks the gap between the short pipe (28) and the input pipe (9). The gap between each first sealing block (33) is used to adjust the flow rate. Then, when the gap is completely closed, the second drive tube (32) is pushed, so that the second drive tube (32) drives the second sealing block (34) to move down through the second connecting rod (36), so that the second sealing block (34) blocks the gap between each first sealing block (33), thereby achieving the purpose of completely closing the input pipe (9).

2. A valve actuator according to claim 1, characterized in that: The fitting component (12) is a hollow tube. The upper end of the hollow tube is closed, and the lower end is connected to the output pipe (10). Several through holes (13) are provided on the outer circumferential wall of the end of the hollow tube away from the output pipe (10). Each through hole (13) is arranged along the length of the hollow tube. A ring (14) is provided on the outer circumferential wall of the end of the hollow tube close to the output pipe (10). The inner wall of the ring (14) is connected to the outer wall of the hollow tube. The bottom surface of the ring (14) is connected to the inner bottom surface of the receiving chamber (11). A first sealing ring (15) is provided on the top surface of the ring (14). The first sealing ring (15) is sleeved on the outer circumferential wall of the bottom end of the hollow tube.

3. A valve actuator according to claim 2, characterized in that: The closed execution chamber (4) and the open execution chamber (5) together form an adjustment chamber (16). The adjustment chamber (16) is a cylindrical structure. The length of the cylindrical structure is parallel to the length of the hollow tube and is slidably arranged. The execution block (6) is arranged along the length of the adjustment chamber (16). The upper part of the execution block (6) is the closed execution chamber (4), and the lower part is the open execution chamber (5). The bottom surface of the open execution chamber (5) is provided with a first sliding hole (17). The lower part of the execution block (6) slides in the first sliding hole (17). The top surface of the closed execution chamber (4) is provided with a second sliding hole (18). The upper part of the execution block (6) slides in the second sliding hole (18).

4. A valve actuator according to claim 3, characterized in that: The execution block (6) includes an execution rod (19) and a blocking ring (20). The inner wall of the blocking ring (20) is connected to the outer wall of the middle part of the execution rod (19). The outer wall of the blocking ring (20) slides on the inner wall of the regulating chamber (16). A mating hole (21) is provided on the lower end face of the execution rod (19). The mating hole (21) is provided along the length direction of the execution rod (19). The inner wall of the mating hole (21) is slidably connected to the outer wall of the hollow tube.

5. A valve actuator according to claim 4, characterized in that: The upper part of the actuator (19) is provided with a slide (22), which is slidably disposed in the slide tube (23). The slide tube (23) is disposed on the top surface of the closed actuator chamber (4). The upper end of the slide tube (23) is connected to the top surface of the closed actuator chamber (4), and the lower end is disposed towards the hollow tube. A spring (24) is also disposed in the closed actuator chamber (4). One end of the spring (24) is connected to the lower end face of the slide tube (23), and the other end of the spring (24) is disposed near the upper part of the plugging ring (20). The spring (24) is sleeved on the outer wall of the actuator (19), and the end of the spring (24) near the slide tube (23) is disposed near the lower part of the slide (22).

6. A valve actuator according to claim 5, characterized in that: The first actuator (1) and the second actuator (2) are both cylindrical structures. The first actuator (1) and the second actuator (2) are respectively provided with a first gas port (25) and a second gas port (26) on their circumferential outer walls. The first gas port (25) and the second gas port (26) are respectively used to connect to the gas source.

7. A valve actuator according to claim 6, characterized in that: The adjusting block (7) includes a pneumatic push rod (27), and multiple pneumatic push rods (27) are provided. Each pneumatic push rod (27) is arranged along the length direction of the actuator (19), and each pneumatic push rod (27) is respectively arranged on the upper part of the boss.

8. A valve actuator according to claim 7, characterized in that: The pneumatic push rod (27) is set inside the closed execution chamber (4). Each pneumatic push rod (27) is arranged in a multi-layer ring structure on the outer wall of the execution rod (19). The multi-layer ring structure is set along the length of the execution rod (19).

9. A valve actuator according to claim 8, characterized in that: Each of the pneumatic push rods (27) located at the same height is connected to a solenoid valve. One end of each solenoid valve is used to connect to the pneumatic push rod (27), and the other end is used to connect to the air source.

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