Low-temperature butterfly valve convenient to seal and adjust and adjusting method of low-temperature butterfly valve

Abstract

The invention discloses a low-temperature butterfly valve convenient to seal and adjust, and relates to the technical field of butterfly valves. Flanges are welded to the two ends of the valve body respectively, a mounting box is integrally formed at the top of the valve body, a top cover is fixed to the top of the mounting box through bolts, a valve seat is mounted in the valve body, a valve clack is rotationally connected into the valve seat, a through valve rod is rotationally connected to the top of the valve body, and the valve rod is fixed to the valve clack. A through pivot is installed at the bottom of the valve body, the pivot is connected with the valve clack in an inserted mode, a fixing cover used for positioning the pivot is fixed to the bottom of the valve body through a bolt, and a worm gear is rotationally connected into the installation box and fixed to the valve rod. The sealing air bag can be inflated, then the sealing air bag is expanded, the sealing effect of the valve clack is improved, meanwhile, when the valve clack is closed, the impact of a medium on the valve clack can be avoided, the service life of the valve clack is prolonged, and impurities can be concentrated and conveniently discharged.

Description

Technical Field

[0001] The invention belongs to the technical field of butterfly valves, and in particular relates to a low-temperature butterfly valve which is convenient for sealing adjustment and an adjustment method thereof. Background Art

[0002] The butterfly valve is a simple regulating valve, which consists of a valve body, a butterfly plate, a valve shaft and other components. Its working principle is to rotate the valve shaft to drive the butterfly plate to rotate, thereby opening and closing the valve. The butterfly valve mainly plays a cutting and throttling role in the pipeline, has good fluid control characteristics, and can be widely used to control air, water, steam, and various corrosive media.

[0003] When the existing butterfly valve is in use, sealing is usually achieved by the cooperation between the valve disc and the valve seat, but the sealing effect needs to be improved. At the same time, when the valve disc is closed, if the closing speed is too fast in the later stage, the medium is easy to impact the valve disc, affecting the service life and sealing effect of the valve disc. Therefore, a low-temperature butterfly valve and an adjustment method thereof which are easy to adjust the sealing are proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a low-temperature butterfly valve and an adjustment method thereof which are easy to seal and adjust, and can inflate the sealing airbag to expand the sealing airbag, thereby increasing the sealing effect of the valve flap. At the same time, when the valve flap is closed, the impact of the medium on the valve flap can be avoided, thereby increasing the service life of the valve flap. Impurities can also be concentrated and conveniently discharged, thereby solving the existing technical problems.

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

[0006] A low-temperature butterfly valve convenient for sealing adjustment, comprising:

[0007] The valve body has flanges welded on both ends of the valve body. A mounting box is integrally formed on the top of the valve body. A top cover is fixed on the top of the mounting box by bolts. A valve seat is installed in the valve body. A valve disc is rotatably connected in the valve seat. A penetrating valve stem is rotatably connected to the top of the valve body. The valve stem and the valve disc are fixed. A penetrating pivot is installed at the bottom of the valve body. The pivot is plugged into the valve disc. A fixing cover for positioning the pivot is fixed to the bottom of the valve body by bolts.

[0008] A worm gear is rotatably connected in the installation box, the worm gear is fixed to the valve stem, an arc-shaped positioning port is arranged on the circumference of the worm gear, a penetrating air pipe is fixedly connected to one side of the installation box, a first piston is slidably connected in 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 connected 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] Sealing airbags for sealing the valve flap are fixedly connected to both sides of the valve flap, and the two sealing airbags are respectively connected to the branch pipe and the main pipe. By installing the sealing airbags on both sides of the valve seat, air can be inflated into the sealing airbags in the later stage of valve flap closing, thereby expanding the sealing airbags and increasing the sealing effect of the valve flap.

[0010] Furthermore, an adjusting plug is slidingly connected in the air pipe, the first spring is located between the adjusting plug and the first piston, one end of the air pipe is rotatably connected to a threaded rod, the threaded rod and the adjusting plug are threadedly connected, and through the coordinated use of the adjusting plug and the threaded rod, the position of the adjusting plug can be adjusted after rotating the threaded rod, and then when the intake volume decreases, the rotation speed of the worm gear can be reduced, thereby avoiding the impact of the medium on the valve flap when closing the valve flap, thereby increasing the service life of the valve flap.

[0011] Furthermore, a worm meshing with a worm wheel is rotatably connected inside the top cover, one end of the worm wheel is fixedly connected to a drive shaft, the drive shaft rotatably passes through the mounting box, and the worm wheel cooperates to facilitate the driving of the valve disc to rotate.

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

[0013] Furthermore, a sinking sedimentation box is fixedly connected to the bottom of the valve body, a slag discharge pipe is fixedly connected to the bottom of the sedimentation box, a transverse pipe is fixedly connected to one side of the slag discharge pipe, a sealing head is threadedly connected to one end of the transverse pipe, a second piston is slidably connected in the slag discharge pipe, the second piston is located on one side of the transverse pipe, a second spring is fixedly connected between the bottom of the second piston and the bottom of the slag discharge pipe, and impurities can be entered into the transverse pipe by installing a sedimentation box at the bottom of the valve body. After the pressure in the pipeline is reduced, the second piston is reset, and the impurities can be removed by removing the sealing head, which is convenient for people to use.

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

[0015] Furthermore, one end of the air pipe is provided with a plurality of scale lines, and a pointer used in conjunction with the scale lines is fixedly connected to the circumference of the threaded rod.

[0016] Furthermore, one side of the installation box is threadedly connected with a penetrating positioning bolt, and the positioning bolt is used in conjunction with the positioning port.

[0017] Furthermore, one side of the installation box is threadedly connected with a penetrating fixing screw, and one side of the positioning port is provided with a threaded hole used in conjunction with the fixing screw.

[0018] The present invention also provides a method for adjusting a cryogenic butterfly valve that is convenient for sealing adjustment, comprising the following steps:

[0019] S1: The valve body is connected to the pipeline through the flange. When adjusting the opening and closing of the pipeline, the hand wheel and the drive shaft are rotated, the drive shaft drives the worm to rotate, the worm 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 hole set on the worm gear is used to push the push rod to move, and 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 airbag through the main pipe and the branch pipe, so that the gas enters the sealing airbag, so that the sealing airbag expands and improves the sealing effect of the valve disc;

[0021] S3: Turn the threaded rod, which drives the regulating plug to move. The regulating plug blocks one end of the main pipe, thereby changing the air intake of the main pipe. When the air intake decreases, the speed of the worm gear can be reduced, thereby preventing the medium from impacting the valve disc when closing the valve disc, thereby increasing 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 pipeline, the second piston moves downward, and the impurities enter the horizontal pipe. After the pressure in the pipeline decreases, the second piston resets, and the impurities can be taken out 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 the present invention, by installing sealing airbags on both sides of the valve seat, air can be inflated into the sealing airbags when the valve flap is closed in the later stage, thereby expanding the sealing airbags and improving the sealing effect of the valve flap.

[0025] In the present invention, by using the adjusting plug and the threaded rod in combination, the position of the adjusting plug can be adjusted after rotating the threaded rod, and then when the air intake volume decreases, the rotation speed of the worm gear can be reduced, thereby avoiding the impact of the medium on the valve flap when closing the valve flap, thereby increasing the service life of the valve flap.

[0026] In the present invention, by installing a sedimentation box at the bottom of the valve body, impurities can enter the horizontal pipe. After the pressure in the pipeline is reduced, the second piston is reset and the sealing head is removed to remove the impurities, which is convenient for people to use.

[0027] In the present invention, when the valve flap is closed in the later stage, air can be inflated into the sealing airbag, thereby expanding the sealing airbag and increasing the sealing effect of the valve flap. At the same time, the final rotation speed of the worm gear can be reduced, so as to avoid the impact of the medium on the valve flap when the valve flap is closed, thereby increasing the service life of the valve flap and allowing impurities to enter the cross pipe. After the pressure in the pipeline is reduced, the second piston is reset and the impurities can be removed by removing the sealing head, which is convenient for people to use.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a three-dimensional structure of a first viewing angle according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a three-dimensional structure of a second viewing angle according to an embodiment of the present invention;

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

[0033] Figure 4 It is a schematic cross-sectional structural diagram of an installation box according to an embodiment of the present invention;

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

[0035] Figure 6 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present invention.

[0036] In the figure: 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. hand wheel; 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. fixing screw; 27. threaded hole; 28. positioning bolt; 29. ​​pointing plate; 30. sealing airbag; 31. slag discharge pipe; 32. cross pipe; 33. second piston; 34. second spring; 35. sealing head. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "opening", "upper", "middle", "length", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0040] Embodiment 1

[0041] See also Figure 1-Figure 6 As shown, in this embodiment, a low-temperature butterfly valve that is easy to seal and adjust is provided, including: a valve body 1, flanges 4 are welded at both ends of the valve body 1, the flanges 4 are used to connect the pipeline, the top of the valve body 1 is integrally formed with a mounting box 2, the top of the mounting box 2 is fixed with a top cover 3 by bolts, a valve seat 10 is installed in the valve body 1, a valve flap 6 is rotatably connected in 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 flap 6, a through pivot 7 is installed at the bottom of the valve body 1, the pivot 7 is plugged with the valve flap 6, a fixing cover 8 for positioning the pivot 7 is fixed to the bottom of the valve body 1 by bolts, the valve body 1 is connected to the pipeline through the flange 4, when adjusting the opening and closing of the pipeline, the valve stem 5 is rotated, and then the valve flap 6 is driven to rotate through the valve stem 5, so as to realize the control of the opening and closing of the pipeline;

[0042] A worm gear 12 is rotatably connected in the installation box 2, and the worm gear 12 is fixed to the valve stem 5 and rotated with the drive shaft 14 through the hand wheel 15. An arc-shaped positioning hole 16 is provided on the circumference of the worm gear 12. A penetrating air pipe 17 is fixedly connected to one side of the installation box 2, and a first piston 18 is slidably connected in 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 is used in conjunction with the positioning hole 16. A first spring 19 for resetting the first piston 18 is installed on one side of the first piston 18. A connected 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. When the valve body 1 is about to be closed, the positioning hole 16 provided on the worm gear 12 is used to push the push rod 20 to move, and the push rod 20 pushes the first piston 18 to move, and the first piston 18 pushes the air in the air pipe 17 into the main pipe 21;

[0043] Sealing airbags 30 for sealing the valve flap 6 are fixedly connected to both sides of the valve flap 6. The two sealing airbags 30 are respectively connected to the branch pipe 11 and the main pipe 21. The gas is pushed into the sealing airbags 30 through the main pipe 21 and the branch pipe 11, respectively, so that the gas enters the sealing airbags 30, causing the sealing airbags 30 to expand, thereby improving the sealing effect of the valve flap 6.

[0044] Embodiment 2

[0045] Improved on the basis of embodiment 1: Refer to attached Figure 1-Figure 6 ,

[0046] In the present invention, an adjusting plug 22 is slidably connected in 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, and the threaded rod 23 is rotated to drive the adjusting plug 22 to move, thereby changing the air intake of the main pipe 21. When the air intake is reduced, the rotation speed of the worm gear 12 can be reduced, thereby preventing the medium from impacting the valve flap 6 when the valve flap 6 is closed, thereby increasing the service life of the valve flap 6.

[0047] In particular, a worm 13 meshing 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, the drive shaft 14 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, and the cooperation between the worm wheel 12 and the worm 13 makes the operation more labor-saving.

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

[0049] In particular, a sinking sedimentation box 9 is fixedly connected to the bottom of the valve body 1, a slag discharge pipe 31 is fixedly connected to the bottom of the sedimentation box 9, a transverse pipe 32 is fixedly connected to one side of the slag discharge pipe 31, a sealing head 35 is threadedly connected to one end of the transverse pipe 32, a second piston 33 is slidably connected in the slag discharge pipe 31, the second piston 33 is located on one side of the transverse pipe 32, 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 pipeline, the second piston 33 moves downward, and then the impurities enter the transverse pipe 32, and after the pressure in the pipeline is reduced, the second piston 33 is reset, and the impurities can be removed by removing the sealing head 35, which is convenient for people to use.

[0050] In the present invention, a pointing plate 29 is fixedly connected to the top of the worm gear 12 , and the pointing plate 29 rotates and penetrates the top cover 3 , so that people can observe the angle of the valve flap 6 conveniently through the pointing plate 29 .

[0051] It should be noted that a plurality of scale lines 25 are provided at one end of the air pipe 17 , and a pointer 24 used in conjunction with the scale lines 25 is fixedly connected to the circumference of the threaded rod 23 . The scale lines 25 and the pointer 24 cooperate to facilitate people to understand the position of the adjustment race 22 .

[0052] In particular, a positioning bolt 28 is threadedly connected to one side of the installation box 2. The positioning bolt 28 is used in conjunction with the positioning port 16. The positioning bolt 28 can position the angle of the valve flap 6 to increase the accuracy of opening.

[0053] In the present invention, a fixing screw 26 is threadedly connected to one side of the installation box 2, and a threaded hole 27 for use with the fixing screw 26 is opened on one side of the positioning port 16. The fixing screw 26 and the threaded hole 27 cooperate to further maintain the stability of the valve flap 6 when it is opened.

[0054] The present invention also provides a method for adjusting a cryogenic butterfly valve that is convenient for 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 hand wheel 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, 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 opening 16 provided on the worm gear 12 is used to push the push rod 20 to move, and 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, so that the gas enters the sealing airbag 30, so that the sealing airbag 30 expands, thereby improving the sealing effect of the valve flap 6;

[0057] S3: The threaded rod 23 is rotated, and the threaded rod 23 drives the regulating plug 22 to move. The regulating 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 rotation speed of the worm gear 12 can be reduced, so as to avoid the impact of the medium on the valve disc 6 when the valve disc 6 is closed, thereby increasing 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 pipeline, the second piston 33 moves downward, and then the impurities enter the cross pipe 32. After the pressure in the pipeline is reduced, the second piston 33 is reset, and the impurities can be taken out 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", "second", etc. are merely used to distinguish between various features and have no actual order or directional meaning, and this application is not limited to this.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low temperature butterfly valve that is easy to adjust the seal. It is characterized in that include: A valve body (1), flanges (4) are welded at 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 in the valve body (1), a valve flap (6) is rotatably connected in the valve seat (10), a penetrating valve stem (5) is rotatably connected to the top of the valve body (1), the valve stem (5) is fixed to the valve flap (6), a penetrating pivot (7) is installed at the bottom of the valve body (1), the pivot (7) is plugged with the valve flap (6), and a fixing cover (8) for positioning the pivot (7) is fixed to the bottom of the valve body (1) by bolts; A worm gear (12) is rotatably connected in the installation box (2), the worm gear (12) is fixed to the valve stem (5), a circular arc-shaped positioning opening (16) is arranged on the circumference of the worm gear (12), a penetrating air pipe (17) is fixedly connected to one side of the installation box (2), a first piston (18) is slidably connected in 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 opening (16), a first spring (19) for resetting the first piston (18) is installed on one side of the first piston (18), a connected 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); Sealing air bags (30) for sealing the valve flap (6) are fixedly connected to both sides of the valve flap (6), and the two sealing air bags (30) are respectively connected to the branch pipe (11) and the main pipe (21).

2. A low temperature butterfly valve that is easy to seal and adjust as claimed in claim 1, It is characterized in that An adjusting plug (22) is slidably connected inside the air pipe (17), the 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), and the threaded rod (23) and the adjusting plug (22) are threadedly connected.

3. A low temperature butterfly valve that is easy to seal and adjust as claimed in claim 1, It is characterized in that A worm (13) meshing with the 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) rotatably penetrates the installation box (2).

4. A low temperature butterfly valve that is easy to seal and adjust as claimed in claim 3, It is characterized in that A hand wheel (15) is fixed to one end of the driving shaft (14) via bolts.

5. A low temperature butterfly valve that is easy to seal and adjust as claimed in claim 1, It is 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), one side of the slag discharge pipe (31) is fixedly connected to a transverse pipe (32), one end of the transverse pipe (32) is threadedly connected to a sealing head (35), a second piston (33) is slidably connected inside the slag discharge pipe (31), the second piston (33) is located on one side of the transverse 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).

6. A low temperature butterfly valve for easy sealing adjustment as claimed in claim 1, It is characterized in that A pointing plate (29) is fixedly connected to the top of the worm wheel (12), and the pointing plate (29) rotates and penetrates the top cover (3).

7. A low temperature butterfly valve for easy sealing adjustment as claimed in claim 1, It is characterized in that One end of the air pipe (17) is provided with a plurality of scale lines (25), and a pointer (24) used in conjunction with the scale lines (25) is fixedly connected to the circumference of the threaded rod (23).

8. A low temperature butterfly valve for easy sealing adjustment as claimed in claim 1, It is characterized in that One side of the installation box (2) is threadedly connected with a penetrating positioning bolt (28), and the positioning bolt (28) is used in conjunction with the positioning opening (16).

9. A low temperature butterfly valve for easy sealing adjustment as claimed in claim 1, It is characterized in that One side of the installation box (2) is threadedly connected with a penetrating fixing screw (26), and one side of the positioning opening (16) is provided with a threaded hole (27) for use with the fixing screw (26).

10. A method for adjusting a cryogenic butterfly valve that facilitates seal adjustment according to any one of claims 1 to 9, It is 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 hand wheel (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, 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; S2: When the valve body (1) is about to be closed, the positioning opening (16) provided on the worm gear (12) is used to push the push rod (20) to move, and 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), thereby entering the sealing airbag (30), causing the sealing airbag (30) to expand, thereby improving the sealing effect of the valve flap (6); S3: The threaded rod (23) is rotated, and the threaded rod (23) drives the regulating plug (22) to move, and the regulating plug (22) blocks one end of the main pipe (21), thereby changing the air intake of the main pipe (21). When the air intake decreases, the rotation speed of the worm gear (12) can be reduced, so that when the valve flap (6) is closed, the medium is prevented from impacting the valve flap (6), thereby increasing the service life of the valve flap (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 pipeline, the second piston (33) moves downward, and then the impurities enter the horizontal pipe (32). After the pressure in the pipeline decreases, the second piston (33) is reset, and the impurities can be removed by removing the sealing head (35), which is convenient for people to use.

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