A low-temperature butterfly valve convenient for sealing adjustment and its adjustment method

Abstract

This invention discloses a cryogenic butterfly valve that facilitates sealing adjustment, relating to the field of butterfly valve technology. The invention includes a valve body with flanges welded to both ends. An integrally formed mounting box is located on the top of the valve body, and a top cover is bolted to the top of the mounting box. A valve seat is installed inside the valve body, and a valve disc is rotatably connected within the valve seat. A through-type valve stem is rotatably connected to the top of the valve body and fixed to the valve disc. A through-type pivot is installed at the bottom of the valve body and inserted into the valve disc. A fixing cover for pivot positioning is bolted to the bottom of the valve body. A worm gear is rotatably connected within the mounting box and fixed to the valve stem. This invention allows for the inflation of a sealing bladder, thereby increasing the sealing effect of the valve disc. Simultaneously, it prevents the medium from impacting the valve disc when closing, extending the valve disc's service life. Furthermore, it allows for the collection and convenient discharge of impurities.

Description

Technical Field

[0001] This invention belongs to the field of butterfly valve technology, and in particular relates to a low-temperature butterfly valve and its adjustment method that facilitates sealing adjustment. Background Technology

[0002] A butterfly valve is a simple regulating valve consisting of a valve body, a butterfly plate, and a valve shaft. Its working principle involves rotating the valve shaft to drive the butterfly plate, thus opening and closing the valve. Butterfly valves primarily function as shut-off and throttling devices in pipelines, possessing excellent fluid control characteristics and widely used to control air, water, steam, and various corrosive media.

[0003] Existing butterfly valves typically achieve sealing through the cooperation of the valve disc and valve seat, but the sealing effect needs improvement. In addition, if the valve disc closes too quickly in the later stages, the medium can easily impact the valve disc, affecting its service life and sealing effect. Therefore, a cryogenic butterfly valve and its adjustment method that facilitates sealing adjustment are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a cryogenic butterfly valve and its adjustment method that facilitates sealing adjustment. It can inflate the sealing bladder, thereby increasing the sealing effect of the valve disc. At the same time, it can prevent the medium from impacting the valve disc when the valve disc is closed, thus improving the service life of the valve disc. It can also concentrate and facilitate the discharge of impurities, thus solving the existing technical problems.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A cryogenic butterfly valve that facilitates sealing and adjustment includes:

[0007] The valve body has flanges welded to both ends. The top of the valve body is integrally formed with a mounting box, and the top of the mounting box is fixed with a top cover by bolts. The valve body has a valve seat installed inside, and a valve disc is rotatably connected inside the valve seat. The top of the valve body is rotatably connected with a through valve stem, and the valve stem is fixed to the valve disc. The bottom of the valve body has a through pivot installed, and the pivot is inserted into the valve disc. The bottom of the valve body is fixed with a fixing cover for positioning the pivot by bolts.

[0008] The mounting box is rotatably connected to a worm gear, which is fixed to the valve stem. The worm gear has an arc-shaped positioning port on its circumference. A through air pipe is fixedly connected to one side of the mounting box. A first piston is slidably connected inside the air pipe. A push rod is fixedly connected to one end of the first piston and passes through the air pipe and cooperates with the positioning port. A first spring for resetting the first piston is installed on one side of the first piston. A main pipe is fixedly connected to one side of the air pipe, and a branch pipe is fixedly connected to one side of the main pipe.

[0009] Both sides of the valve disc are fixedly connected to sealing airbags for sealing the valve disc. The two sealing airbags are respectively connected to the branch pipe and the main pipe. By installing sealing airbags on both sides of the valve seat, air can be injected into the sealing airbags in the later stage of valve disc closure, thereby causing the sealing airbags to expand and increasing the sealing effect of the valve disc.

[0010] Furthermore, an adjusting plug is slidably connected inside the air pipe, the first spring is located between the adjusting plug and the first piston, and a threaded rod is rotatably connected to one end of the air pipe. The threaded rod and the adjusting plug are threadedly connected. Through the cooperation of the adjusting plug and the threaded rod, the position of the adjusting plug can be adjusted after rotating the threaded rod. Thus, when the air intake is reduced, the speed of the worm gear can be reduced, thereby avoiding the impact of the medium on the valve disc when closing the valve disc and improving the service life of the valve disc.

[0011] Furthermore, a worm gear meshing with a worm wheel is rotatably connected inside the top cover. One end of the worm gear is fixedly connected to a drive shaft, which rotates through the mounting box. The worm gear and worm wheel work together to facilitate the rotation of the valve disc.

[0012] Furthermore, a handwheel is fixed to one end of the drive shaft by bolts.

[0013] Furthermore, a sinking sedimentation box is fixedly connected to the bottom of the valve body, and a slag discharge pipe is fixedly connected to the bottom of the sedimentation box. A horizontal pipe is fixedly connected to one side of the slag discharge pipe, and a sealing head is threadedly connected to one end of the horizontal pipe. A second piston is slidably connected inside the slag discharge pipe. The second piston is located on one side of the horizontal pipe, and a second spring is fixedly connected between the bottom of the second piston and the bottom of the slag discharge pipe. By installing a sedimentation box at the bottom of the valve body, impurities can enter the horizontal pipe. After the pressure in the pipe decreases, the second piston resets, and the impurities can be removed by removing the sealing head, which is convenient for people to use.

[0014] Furthermore, a guide plate is fixedly connected to the top of the worm gear, and the guide plate rotates through the top cover.

[0015] Furthermore, one end of the trachea is provided with multiple scale lines, and a pointer that works in conjunction with the scale lines is fixedly connected to the circumference of the threaded rod.

[0016] Furthermore, a through-hole positioning bolt is threaded onto one side of the mounting box, and the positioning bolt is used in conjunction with the positioning port.

[0017] Furthermore, a through fixing screw is threaded to one side of the mounting box, and a threaded hole for cooperating with the fixing screw is provided on one side of the positioning port.

[0018] This invention also proposes a method for adjusting a cryogenic butterfly valve that facilitates sealing adjustment, comprising the following steps:

[0019] S1: The valve body is connected to the pipeline via a flange. When adjusting the opening and closing of the pipeline, the handwheel and drive shaft are rotated. The drive shaft drives the worm gear to rotate, the worm gear drives the worm wheel to rotate, the worm wheel drives the valve stem to rotate, and then the valve stem drives the valve disc to rotate, thereby realizing the control of the opening and closing of the pipeline.

[0020] S2: When the valve body is about to close, the positioning port on the worm gear pushes the push rod to move, the push rod pushes the first piston to move, the first piston pushes the air in the air pipe into the main pipe, and then pushes the gas into the sealing air bladder through the main pipe and the branch pipe, thereby entering the sealing air bladder, causing the sealing air bladder to expand and improve the sealing effect of the valve disc.

[0021] S3: Rotate the threaded rod, which drives the adjusting plug to move. The adjusting plug blocks one end of the main pipe, thereby changing the air intake of the main pipe. When the air intake is reduced, the speed of the worm gear can be reduced, thus preventing the medium from impacting the valve disc when closing the valve disc and improving the service life of the valve disc.

[0022] S4: When the medium passes through the sedimentation box, some impurities fall into the sedimentation box and then enter the slag discharge pipe. At the same time, due to the increase in air pressure in the pipe, the second piston moves downward, which in turn allows the impurities to enter the horizontal pipe. After the pressure in the pipe decreases, the second piston returns to its original position. The impurities can be removed by removing the sealing head, which is convenient for people to use.

[0023] The embodiments of the present invention have the following beneficial effects:

[0024] In this invention, by installing sealing airbags on both sides of the valve seat, air can be injected into the sealing airbags during the later stage of valve disc closure, thereby causing the sealing airbags to expand and increasing the sealing effect of the valve disc.

[0025] In this invention, the position of the adjusting plug can be adjusted by rotating the threaded rod, thereby reducing the speed of the worm gear when the air intake is reduced. This prevents the medium from impacting the valve disc when it is closed, thus improving the service life of the valve disc.

[0026] In this invention, by installing a sedimentation box at the bottom of the valve body, impurities can enter the horizontal pipe. After the pressure inside the pipe decreases, the second piston resets, and the impurities can be removed by taking off the sealing head, making it convenient for people to use.

[0027] In this invention, air can be injected into the sealing bladder during the later stage of valve disc closure, thereby expanding the sealing bladder and increasing the sealing effect of the valve disc. At the same time, it can reduce the final speed of the worm gear, thus avoiding the impact of the medium on the valve disc when closing the valve disc, improving the service life of the valve disc, and also allowing impurities to enter the horizontal pipe. After the pressure in the pipeline decreases, the second piston resets, and the sealing head can be removed to remove the impurities, making it convenient for users.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural diagram of a first perspective according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a two-dimensional structure from a second perspective according to an embodiment of the present invention;

[0032] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of the mounting box according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic cross-sectional view of the valve body according to an embodiment of the present invention;

[0035] Figure 6 This is a partial cross-sectional structural diagram of an embodiment of the present invention.

[0036] In the diagram: 1. Valve body; 2. Mounting box; 3. Top cover; 4. Flange; 5. Valve stem; 6. Valve disc; 7. Pivot; 8. Fixed cover; 9. Sedimentation box; 10. Valve seat; 11. Branch pipe; 12. Worm gear; 13. Worm; 14. Drive shaft; 15. Handwheel; 16. Positioning port; 17. Air pipe; 18. First piston; 19. First spring; 20. Push rod; 21. Main pipe; 22. Adjusting plug; 23. Threaded rod; 24. Pointer; 25. Scale line; 26. Fixed screw; 27. Threaded hole; 28. Positioning bolt; 29. ​​Pointer plate; 30. Sealing airbag; 31. Slag discharge pipe; 32. Horizontal pipe; 33. Second piston; 34. Second spring; 35. Sealing head. Detailed Implementation

[0037] 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.

[0038] In the description of this invention, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0039] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0040] Example 1

[0041] Please see Figures 1-6 As shown, this embodiment provides a low-temperature butterfly valve that facilitates sealing and adjustment, comprising: a valve body 1, flanges 4 welded to both ends of the valve body 1 for connecting to pipelines, an integrally formed mounting box 2 on the top of the valve body 1, a top cover 3 fixed to the top of the mounting box 2 by bolts, a valve seat 10 installed inside the valve body 1, a valve disc 6 rotatably connected inside the valve seat 10, a through valve stem 5 rotatably connected to the top of the valve body 1, the valve stem 5 being fixed to the valve disc 6, a through pivot 7 installed at the bottom of the valve body 1, the pivot 7 being inserted into the valve disc 6, a fixing cover 8 for positioning the pivot 7 fixed to the bottom of the valve body 1 by bolts, the valve body 1 being connected to the pipeline by flanges 4, and when adjusting the opening and closing of the pipeline, rotating the valve stem 5, thereby driving the valve disc 6 to rotate, thus realizing the control of the opening and closing of the pipeline;

[0042] A worm gear 12 is rotatably connected inside the mounting box 2. The worm gear 12 is fixed to the valve stem 5 and rotates with the drive shaft 14 via the handwheel 15. An arc-shaped positioning port 16 is provided on the circumference of the worm gear 12. A through air pipe 17 is fixedly connected to one side of the mounting box 2. A first piston 18 is slidably connected inside the air pipe 17. A push rod 20 is fixedly connected to one end of the first piston 18 and passes through the air pipe 17 and cooperates with the positioning port 16. A first spring 19 for resetting the first piston 18 is installed on one side of the first piston 18. A main pipe 21 is fixedly connected to one side of the air pipe 17. A branch pipe 11 is fixedly connected to one side of the main pipe 21. When the valve body 1 is about to close, the positioning port 16 on the worm gear 12 pushes the push rod 20 to move. The push rod 20 pushes the first piston 18 to move. The first piston 18 pushes the air in the air pipe 17 into the main pipe 21.

[0043] Both sides of the valve disc 6 are fixedly connected to sealing airbags 30 for sealing the valve disc 6. The two sealing airbags 30 are respectively connected to the branch pipe 11 and the main pipe 21. Gas is pushed into the sealing airbags 30 through the main pipe 21 and the branch pipe 11, thereby entering the sealing airbags 30, causing the sealing airbags 30 to expand and improve the sealing effect of the valve disc 6.

[0044] Example 2

[0045] Improvements based on Example 1: See Appendix Figures 1-6 ,

[0046] In this invention, an adjusting plug 22 is slidably connected inside the air pipe 17. A first spring 19 is located between the adjusting plug 22 and the first piston 18. One end of the air pipe 17 is rotatably connected to a threaded rod 23. The threaded rod 23 and the adjusting plug 22 are threadedly connected. Rotating the threaded rod 23 drives the adjusting plug 22 to move, changing the air intake of the main pipe 21. When the air intake is reduced, the rotational speed of the worm gear 12 can be reduced, thereby avoiding the impact of the medium on the valve disc 6 when closing the valve disc 6 and improving the service life of the valve disc 6.

[0047] In particular, a worm 13 that meshes with a worm wheel 12 is rotatably connected inside the top cover 3. One end of the worm 13 is fixedly connected to a drive shaft 14. The drive shaft 14 rotates through the mounting box 2, drives the worm 13 to rotate, the worm 13 drives the worm wheel 12 to rotate, and the worm wheel 12 drives the valve stem 5 to rotate. Through the cooperation of the worm wheel 12 and the worm 13, the operation is more labor-saving.

[0048] It should be noted that a handwheel 15 is fixed to one end of the drive shaft 14 by bolts, and the handwheel 15 makes it convenient for people to rotate the drive shaft 14.

[0049] In particular, a sinking sedimentation box 9 is fixedly connected to the bottom of the valve body 1, and a slag discharge pipe 31 is fixedly connected to the bottom of the sedimentation box 9. A horizontal pipe 32 is fixedly connected to one side of the slag discharge pipe 31, and a sealing head 35 is threadedly connected to one end of the horizontal pipe 32. A second piston 33 is slidably connected inside the slag discharge pipe 31. The second piston 33 is located on one side of the horizontal pipe 32, and a second spring 34 is fixedly connected between the bottom of the second piston 33 and the bottom of the slag discharge pipe 31. When the medium passes through the sedimentation box 9, some impurities fall into the sedimentation box 9 and then enter the slag discharge pipe 31. At the same time, due to the increase in air pressure in the pipe, the second piston 33 moves downward, which in turn causes the impurities to enter the horizontal pipe 32. After the pressure in the pipe decreases, the second piston 33 returns to its original position. The impurities can be removed by removing the sealing head 35, which is convenient for people to use.

[0050] In this invention, a guide plate 29 is fixedly connected to the top of the worm gear 12. The guide plate 29 rotates through the top cover 3, and people can easily observe the angle of the valve disc 6 through the guide plate 29.

[0051] It should be noted that one end of the trachea 17 is provided with multiple scale lines 25, and the circumference of the threaded rod 23 is fixedly connected to a pointer 24 that works in conjunction with the scale lines 25. The combination of the scale lines 25 and the pointer 24 makes it easy for people to understand the position of the adjustment valve 22.

[0052] In particular, a through-hole positioning bolt 28 is threaded on one side of the mounting box 2. The positioning bolt 28 works in conjunction with the positioning port 16. The positioning bolt 28 can position the angle of the valve disc 6, increasing the accuracy of opening.

[0053] In this invention, a through fixing screw 26 is threadedly connected to one side of the mounting box 2, and a threaded hole 27 is provided on one side of the positioning port 16 to cooperate with the fixing screw 26. The cooperation between the fixing screw 26 and the threaded hole 27 can further maintain the stability of the valve disc 6 when it is opened.

[0054] This invention also proposes a method for adjusting a cryogenic butterfly valve that facilitates sealing adjustment, comprising the following steps:

[0055] S1: The valve body 1 is connected to the pipeline through the flange 4. When adjusting the opening and closing of the pipeline, the handwheel 15 and the drive shaft 14 are rotated. The drive shaft 14 drives the worm gear 13 to rotate, the worm gear 13 drives the worm wheel 12 to rotate, the worm wheel 12 drives the valve stem 5 to rotate, and then the valve stem 5 drives the valve disc 6 to rotate, thereby realizing the control of the opening and closing of the pipeline.

[0056] S2: When the valve body 1 is about to close, the positioning port 16 on the worm gear 12 pushes the push rod 20 to move, the push rod 20 pushes the first piston 18 to move, the first piston 18 pushes the air in the air pipe 17 into the main pipe 21, and then pushes the gas into the sealing airbag 30 through the main pipe 21 and the branch pipe 11 respectively, so that the sealing airbag 30 expands and improves the sealing effect of the valve disc 6;

[0057] S3: Rotate the threaded rod 23, which drives the adjusting plug 22 to move. The adjusting plug 22 blocks one end of the main pipe 21, thereby changing the air intake of the main pipe 21. When the air intake is reduced, the speed of the worm gear 12 can be reduced, thus avoiding the impact of the medium on the valve disc 6 when closing the valve disc 6 and improving the service life of the valve disc 6.

[0058] S4: When the medium passes through the sedimentation box 9, some impurities fall into the sedimentation box 9 and then enter the slag discharge pipe 31. At the same time, due to the increase in air pressure in the pipe, the second piston 33 moves downward, which in turn causes the impurities to enter the horizontal pipe 32. After the pressure in the pipe decreases, the second piston 33 returns to its original position. The impurities can be removed by removing the sealing head 35, which is convenient for people to use.

[0059] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0060] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cryogenic butterfly valve that facilitates sealing and adjustment, characterized in that, include: A valve body (1) is provided, with flanges (4) welded to both ends of the valve body (1). A mounting box (2) is integrally formed on the top of the valve body (1). A top cover (3) is fixed to the top of the mounting box (2) by bolts. A valve seat (10) is installed inside the valve body (1). A valve disc (6) is rotatably connected inside the valve seat (10). A through valve stem (5) is rotatably connected to the top of the valve body (1). The valve stem (5) is fixed to the valve disc (6). A through pivot (7) is installed at the bottom of the valve body (1). The pivot (7) is inserted into the valve disc (6). A fixing cover (8) for positioning the pivot (7) is fixed to the bottom of the valve body (1) by bolts. The mounting box (2) is rotatably connected to a worm gear (12), which is fixed to the valve stem (5). The worm gear (12) has an arc-shaped positioning port (16) on its circumference. A through air pipe (17) is fixedly connected to one side of the mounting box (2). A first piston (18) is slidably connected inside the air pipe (17). A push rod (20) is fixedly connected to one end of the first piston (18), which passes through the air pipe (17) and works in conjunction with the positioning port (16). A first spring (19) for resetting the first piston (18) is installed on one side of the first piston (18). A main pipe (21) is fixedly connected to one side of the air pipe (17), and a branch pipe (11) is fixedly connected to one side of the main pipe (21). Both sides of the valve disc (6) are fixedly connected to sealing airbags (30) for sealing the valve disc (6), and the two sealing airbags (30) are respectively connected to the branch pipe (11) and the main pipe (21). An adjusting plug (22) is slidably connected inside the air tube (17). The first spring (19) is located between the adjusting plug (22) and the first piston (18). One end of the air tube (17) is rotatably connected to a threaded rod (23), and the threaded rod (23) and the adjusting plug (22) are threadedly connected.

2. The cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, The top cover (3) is rotatably connected to a worm (13) that meshes with a worm wheel (12). One end of the worm (13) is fixedly connected to a drive shaft (14), which rotates through the mounting box (2).

3. The cryogenic butterfly valve for easy sealing and adjustment as described in claim 2, characterized in that, A handwheel (15) is fixed to one end of the drive shaft (14) by bolts.

4. The cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, The bottom of the valve body (1) is fixedly connected to a sinking sedimentation box (9), the bottom of the sedimentation box (9) is fixedly connected to a slag discharge pipe (31), a horizontal pipe (32) is fixedly connected to one side of the slag discharge pipe (31), a sealing head (35) is threaded to one end of the horizontal pipe (32), a second piston (33) is slidably connected inside the slag discharge pipe (31), the second piston (33) is located on one side of the horizontal pipe (32), and a second spring (34) is fixedly connected between the bottom of the second piston (33) and the bottom of the slag discharge pipe (31).

5. A cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, The top of the worm gear (12) is fixedly connected to a guide plate (29), which rotates through the top cover (3).

6. A cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, One end of the trachea (17) is provided with multiple scale lines (25), and the circumference of the threaded rod (23) is fixedly connected with a pointer (24) that works in conjunction with the scale lines (25).

7. A cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, The mounting box (2) has a threaded connection on one side with a through positioning bolt (28), which is used in conjunction with the positioning port (16).

8. A cryogenic butterfly valve for easy sealing and adjustment as described in claim 1, characterized in that, The mounting box (2) has a through fixing screw (26) threaded to one side, and the positioning port (16) has a threaded hole (27) on one side that is used to cooperate with the fixing screw (26).

9. A method for adjusting a cryogenic butterfly valve that facilitates sealing adjustment as described in any one of claims 1-8, characterized in that, The following steps are involved: S1: The valve body (1) is connected to the pipeline through the flange (4). When adjusting the opening and closing of the pipeline, the handwheel (15) and the drive shaft (14) are rotated. The drive shaft (14) drives the worm (13) to rotate. The worm (13) drives the worm wheel (12) to rotate. The worm wheel (12) drives the valve stem (5) to rotate. Then the valve stem (5) drives the valve disc (6) to rotate, thereby realizing the control of the opening and closing of the pipeline. S2: When the valve body (1) is about to close, the positioning port (16) set on the worm gear (12) is used to push the push rod (20) to move. The push rod (20) pushes the first piston (18) to move. The first piston (18) pushes the air in the air pipe (17) into the main pipe (21). Then, through the main pipe (21) and the branch pipe (11), the gas is pushed into the sealing airbag (30) respectively, thus entering the sealing airbag (30), causing the sealing airbag (30) to expand and improve the sealing effect of the valve disc (6). S3: Rotate the threaded rod (23), which drives the adjusting plug (22) to move. The adjusting plug (22) blocks one end of the main pipe (21), thereby changing the air intake of the main pipe (21). When the air intake is reduced, the speed of the worm gear (12) can be reduced, thus avoiding the impact of the medium on the valve disc (6) when the valve disc (6) is closed, and improving the service life of the valve disc (6). S4: When the medium passes through the sedimentation box (9), some impurities fall into the sedimentation box (9) and then enter the slag discharge pipe (31). At the same time, due to the increase in air pressure in the pipe, the second piston (33) moves downward, which in turn causes the impurities to enter the horizontal pipe (32). After the pressure in the pipe decreases, the second piston (33) resets. The impurities can be removed by removing the sealing head (35), which is convenient for people to use.

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