A bellows shut-off valve

Abstract

The application relates to the technical field of stop valves, and discloses a corrugated pipe stop valve which comprises a valve body and a valve cover, the valve cover is fixedly connected to the valve body, a valve rod is slidably connected to the valve cover and used for opening and closing the valve body, a sealing element is arranged on the valve cover, a corrugated pipe is sleeved on the valve rod, and the corrugated pipe is located on the side of the sealing element close to the valve body. The corrugated pipe is sleeved on the valve rod, so that the fluid is difficult to move along the outer surface of the valve rod; in addition, the corrugated pipe is located on the side of the sealing element close to the valve body, so that the corrugated pipe can limit the fluid from moving to the sealing element, the erosion of the fluid to the sealing element is reduced, the service life of the sealing element is prolonged, and the problem of fluid leakage is avoided; the corrugated pipe is sleeved on the valve rod, in addition, the particulate matter in the fluid can wash the corrugated pipe along with the fluid, due to the ring gap effect, the flow speed of the fluid in the ring gap is reduced, the washing of the fluid to the corrugated pipe is reduced, the damage of the corrugated pipe is reduced, and the corrugated pipe is not easy to be damaged due to direct washing.

Description

Technical Field

[0001] This application relates to the technical field of gate valves, and in particular to a bellows gate valve. Background Technology

[0002] A gate valve is a forced-seal valve that opens and closes through the linear movement of a valve disc. It is widely used in the field of fluid control and can supply heat transfer oil or highly toxic fluids.

[0003] In related technologies, a gate valve includes a valve body and a valve cover. The valve cover is fixedly connected to the valve body, and a valve stem for opening and closing the valve body is slidably connected to the valve cover. A sealing element is sleeved on the valve stem, and the sealing element is located inside the valve cover.

[0004] When fluid passes through the valve body, it may flow along the valve stem toward the seal. If the gate valve is transporting highly toxic or corrosive fluids, these fluids may corrode the seals, making it difficult for them to seal the fluid and causing leakage, which could affect external safety. Summary of the Invention

[0005] To address the issue of potential corrosion of seals by fluid in gate valves, this application provides a bellows gate valve.

[0006] This application provides a bellows-type gate valve, which adopts the following technical solution:

[0007] A bellows gate valve includes a valve body and a valve cover. The valve cover is fixedly connected to the valve body, and a valve stem is slidably connected to the valve cover. The valve stem is used to open and close the valve body. A sealing element is provided on the valve cover, and a bellows is sleeved on the valve stem. The bellows is located on the side of the sealing element close to the valve body.

[0008] By adopting the above technical solution, the bellows is sleeved on the valve stem, making it difficult for fluid to move along the outer surface of the valve stem. In addition, the bellows is located on the side of the seal closer to the valve body, which restricts the fluid movement to the seal, reduces fluid erosion of the seal, extends the service life of the seal, and avoids fluid leakage. By sleeved on the valve stem, and with particulate matter in the fluid able to scour the bellows with the fluid, the fluid velocity in the annular gap is reduced due to the annular gap effect, which reduces the scouring of the bellows and reduces the damage to the bellows, making it less susceptible to damage from direct scouring.

[0009] Optionally, a metal gasket is fixedly connected to the bellows, and an annular groove for the bellows to move is provided on the valve body, with the metal gasket located on the groove wall away from the valve body.

[0010] By adopting the above technical solution, a metal gasket is fixedly connected to the bellows, and the metal gasket is located on the groove wall of the annular groove away from the valve body. This makes it difficult for the end face of the bellows to directly press against the groove wall of the annular groove, allowing the metal gasket to be impacted instead of the bellows, reducing the impact on the bellows, making the bellows less prone to damage, and increasing the service life of the bellows.

[0011] Optionally, the valve stem includes a first operating rod and a second operating rod. The first operating rod is located on the side of the second operating rod away from the valve body. The bellows is disposed on the second operating rod. The first operating rod is provided with a fixing strip. The second operating rod has a fixing groove for inserting the fixing strip. The second operating rod has a fixing hole communicating with the fixing groove. A fixing rod is slidably connected in the fixing hole. The fixing strip has a groove for inserting the fixing rod. When the fixing rod is located in the groove, the fixing strip is located in the fixing groove. At this time, the first operating rod is fixed on the second operating rod.

[0012] By adopting the above technical solution, the fixing strip is inserted into the fixing groove, and the operator slides the fixing rod to insert the fixing rod into the groove, thereby limiting the fixing rod on the fixing strip. This allows the first operating rod and the second operating rod to be relatively fixed. Since the first operating rod is located on the side of the second operating rod away from the valve body, and the bellows is set on the second operating rod, if the bellows is damaged, the operator can disassemble the second operating rod and the first operating rod to replace the second operating rod separately, eliminating the need to replace the first operating rod and reducing the cost of replacing the valve rod.

[0013] Optionally, a movable hole is formed on the outer surface of the metal gasket, and a movable strip is slidably connected in the movable hole. A first magnet is provided on the movable strip, and a second magnet is provided on the fixed rod. The first magnet can attract the second magnet. When one end of the movable strip abuts against the second operating rod, the fixed rod is inserted into the groove. When the fixed rod is located in the movable hole, the fixed rod can disengage from the groove.

[0014] By adopting the above technical solution, the operator slides the movable bar inside the movable hole, and the first magnet attracts the second magnet, which causes the movable bar to move the fixed rod. This allows the fixed rod to move from the fixed hole into the movable hole, enabling it to disengage from the groove and unlock the fixed bar. The movable bar then abuts against the fixed rod, allowing it to smoothly insert into the groove and lock the fixed bar. Furthermore, the movement of the movable bar allows the fixed rod to approach the metal washer in the second operating rod, reducing the overall length of the second operating rod and further reducing the cost of replacing the valve stem.

[0015] Optionally, the valve cover includes a first connecting portion and a second connecting portion, the first connecting portion being located on the side of the second connecting portion away from the valve body, the annular groove being formed on the second connecting portion, the annular groove penetrating the second connecting portion along its length, and the metal gasket abutting against the surface of the first connecting portion.

[0016] By adopting the above technical solution, with the first connecting part located on the side of the second connecting part away from the valve body, the operator can disassemble the first and second connecting parts without having to remove the valve stem from the entire valve cover to find the connection between the first and second operating rods. This allows the operator to find the connection between the first and second operating rods more quickly, enabling the operator to quickly disassemble the first and second operating rods and replace the second operating rod.

[0017] Optionally, a limiting sleeve is provided on the first connecting part, and a movable inclined surface is formed on the surface of the movable strip away from the fixed rod. The distance between the movable inclined surface and the fixed rod gradually increases along the direction from the first connecting part to the second connecting part. The movable inclined surface is located on the moving path of the limiting sleeve. When the limiting sleeve abuts against the second connecting part, the movable strip is fully inserted into the movable hole.

[0018] By adopting the above technical solution, when the first connecting part is installed on the second connecting part, the movable inclined surface is located on the moving path of the limiting sleeve. The limiting sleeve pushes the movable strip to move through the movable inclined surface, allowing the movable strip to move towards the fixed rod, so that the fixed rod can be smoothly inserted into the groove, thereby limiting the fixed rod to the fixed strip. This allows the first operating rod and the second operating rod to be fixed to each other, preventing the operator from neglecting to fix the first operating rod and the second operating rod due to negligence, and increasing the stability of the first operating rod and the second operating rod when fixed.

[0019] Optionally, the second operating lever includes an operating sleeve and an operating bar. The operating sleeve is rotatably connected to the operating bar, and the operating bar is used to open and close the valve body. A fixing groove is formed on the operating sleeve, and the operating bar can be located within the fixing groove. A plurality of receiving blocks are provided on the outer surface of the operating bar, and the plurality of receiving blocks are distributed along the circumference of the operating bar. The receiving blocks are located on the moving path of the fixing rod. The operating sleeve is provided with a rotating component for driving the operating bar to rotate. When the fixing rod is located within the fixing groove, the fixing rod restricts the rotation of the operating bar.

[0020] By adopting the above technical solution, the rotating component drives the operating bar to rotate, enabling the operating bar to rotate. In addition, the operating bar can open and close the valve body, preventing the fluid from continuously scouring the same part of the operating bar, reducing damage caused by fluid scouring, and allowing the operating bar to better seal the valve body. When the fixed rod is in the fixed groove, the receiving block is positioned on the moving path of the fixed rod, allowing the fixed rod to restrict the movement of the receiving block, making it difficult for the receiving block to drive the operating bar to rotate. The operator can move the fixed rod out of the fixed groove, at which point the rotating component can drive the fixed rod to rotate, allowing the operating bar to rotate smoothly, thus enabling the operator to quickly rotate the operating bar.

[0021] Optionally, the rotating component includes a rotating magnet and a movable magnet. The rotating magnet is disposed on the operating sleeve, and the movable magnet is disposed on the receiving block. The rotating magnet attracts the movable magnet. When the fixed rod is located in the groove, the fixed rod pushes the receiving block to move and realize the rotation of the operating bar. At this time, the rotating magnet attracts the movable magnet, and the fixed rod abuts against the next receiving block.

[0022] By adopting the above technical solution, when the fixing rod is inserted into the groove, the fixing rod can push a receiving block to realize the rotation of the operating bar driven by the fixing rod. At this time, the next receiving block abuts against the fixing rod, so that the fixing rod restricts the continued movement of the receiving block and realizes the fixing of the operating bar. At this time, the rotating magnet attracts the moving magnet. If the fixing rod disengages from the groove, the fixing rod does not limit the receiving block. The rotating magnet can drive the receiving block to rotate, so that the receiving block can drive the operating rod to rotate. Then, the worker inserts the fixing rod into the groove to realize the limiting of the operating bar by the fixing rod and prevent the operating bar from rotating arbitrarily.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By fitting a bellows onto the valve stem, fluid movement along the outer surface of the stem is restricted. Furthermore, the bellows' location on the side of the seal closest to the valve body further limits fluid movement to the seal, reducing erosion and extending its lifespan, thus preventing leaks. Additionally, the bellows' placement on the valve stem allows particulate matter in the fluid to scour the bellows. Due to the annular gap effect, the fluid velocity within the gap decreases, further reducing scouring and damage to the bellows from direct erosion.

[0025] 2. The metal gasket is fixedly connected to the bellows, and the metal gasket is located on the groove wall of the annular groove away from the valve body. This makes it difficult for the bellows to directly press against the groove wall of the annular groove. The metal gasket is subjected to impact, which reduces the impact on the bellows, making the bellows less prone to damage and increasing the service life of the bellows. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of Example 1;

[0027] Figure 2 This is a cross-sectional view highlighting the valve stem in Example 1;

[0028] Figure 3 This is a cross-sectional view highlighting the valve stem in Embodiment 2;

[0029] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0030] Figure 5 This is a schematic diagram highlighting the second operating lever in Embodiment 2;

[0031] Figure 6 This is a schematic diagram highlighting the first operating lever in Embodiment 2.

[0032] Reference numerals: 1. Valve body; 11. Flow hole; 2. Valve cover; 21. Perforation; 211. Receiving groove; 212. Seal; 213. Annular groove; 22. Operating ring; 23. First connecting part; 231. Limiting sleeve; 24. Second connecting part; 241. Limiting groove; 3. Valve stem; 31. Bellows; 32. Metal gasket; 33. First operating lever; 331. Fixing strip; 332. Groove; 335. Placement groove; 333. Slot; 33 4. Rotate magnet; 34. Second operating lever; 341. Fixed groove; 35. Fixed hole; 351. Fixed rod; 352. Movable hole; 353. Movable bar; 354. First magnet; 355. Second magnet; 356. Movable inclined plane; 357. Movable groove; 358. Movable block; 359. Movable spring; 36. Operating sleeve; 37. Operating bar; 371. Rotating rod; 372. Receiving block; 373. Receiving groove; 374. Moving magnet. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0034] Example 1

[0035] This embodiment discloses a bellows shut-off valve. (Refer to...) Figure 1A bellows gate valve includes a valve body 1 and a valve cover 2. The valve cover 2 is bolted to the valve body 1. A flow hole 11 is provided on the valve body 1 for fluid to pass through.

[0036] Reference Figure 2 A through hole 21 is provided on the valve cover 2, extending along the length of the valve cover 2. A valve stem 3 is slidably connected within the through hole 21. An operating ring 22 is rotatably connected to the side of the valve cover 2. The operating ring 22 is mounted on the valve stem 3 and allows the valve stem 3 to move along the direction from the valve cover 2 to the valve body 1. A receiving groove 211 is provided on the wall of the through hole 21. A sealing element 212 is provided within the receiving groove 211. The sealing element 212 is fitted onto the valve stem 3 to achieve a seal between the valve stem 3 and the through hole 21.

[0037] Reference Figure 2 A bellows 31 is fitted onto the outer surface of the valve stem 3. Metal gaskets 32 are fixedly connected to both ends of the bellows 31, and the material of the metal gaskets 32 is the same as that of the bellows 31. The bellows 31 is made of metal and has elastic deformation capability.

[0038] Reference Figure 2 An annular groove 213 is formed on the wall of the perforation 21, extending to the surface of the valve cover 2 facing the valve body 1, and allowing the bellows 31 to move. Two metal gaskets 32 are located within the annular groove 213; the metal gasket 32 ​​closer to the valve body 1 is welded to the outer surface of the valve stem 3, and the other metal gasket 32 ​​is welded to the groove wall of the annular groove 213 away from the valve body 1. When the valve stem 3 moves from the valve body 1 to the valve cover 2, the valve stem 3 drives the bellows 31 to move via the metal gaskets 32, causing the bellows 31 to deform.

[0039] The implementation principle of Example 1 is as follows: the operator rotates the operating ring 22, which drives the valve stem 3 to move, allowing the valve stem 3 to open the valve body 1 and realize the opening of the shut-off valve.

[0040] Example 2

[0041] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that the valve cover 2 includes a first connecting portion 23 and a second connecting portion 24, with the first connecting portion 23 located on the side of the second connecting portion 24 away from the valve body 1. The first connecting portion 23 and the second connecting portion 24 are fixedly connected by bolts, and a through hole 21 is formed on the first connecting portion 23 and the second connecting portion 24, allowing the valve stem 3 to move at the first connecting portion 23 and the second connecting portion 24.

[0042] Reference Figure 3 and Figure 4The valve stem 3 includes a first operating lever 33 and a second operating lever 34. The first operating lever 33 is located on the side of the second operating lever 34 away from the valve body 1. A fixing strip 331 is fixedly connected to the end face of the first operating lever 33 facing the second operating lever 34. A fixing groove 341 is formed on the end face of the second operating lever 34 facing the first operating lever 33 for the fixing strip 331 to be inserted. When the fixing strip 331 is inserted into the fixing groove 341, the end faces of the first operating lever 33 and the second operating lever 34 can abut against each other.

[0043] Reference Figure 4 A metal gasket 32 ​​is fitted onto the outer surface of the second operating lever 34, and a bellows 31 is fitted onto the second operating lever 34. An annular groove 213 is formed on the second connecting portion 24, and the annular groove 213 extends through the end face of the second connecting portion 24 near the first connecting portion 23 along the length direction of the second connecting portion 24. When the metal gasket 32 ​​is fitted onto the outer surface of the second operating lever 34, the metal gasket 32 ​​can abut against the surface of the first connecting portion 23 near the second connecting portion 24.

[0044] Reference Figure 4 A fixing hole 35 is provided on the outer surface of the second operating lever 34, and the fixing hole 35 is connected to the fixing groove 341. A fixing rod 351 is slidably connected in the fixing hole 35, and a groove 332 is provided on the outer surface of the fixing strip 331 for the fixing rod 351 to be inserted. The fixing rod 351 can pass through the fixing hole 35 and be inserted into the groove 332. At this time, the fixing strip 331 is located in the fixing groove 341, so as to realize the mutual fixation of the first operating lever 33 and the second operating lever 34.

[0045] Reference Figure 4 A limiting sleeve 231 is fixedly connected to the surface of the first connecting portion 23 near the second connecting portion 24. The limiting sleeve 231 is annular. A limiting groove 241 for inserting the limiting sleeve 231 is formed on the surface of the second connecting portion 24 near the first connecting portion 23, and the limiting groove 241 extends circumferentially along the second connecting portion 24. When the limiting sleeve 231 is inserted into the limiting groove 241, the end face of the first connecting portion 23 near the second connecting portion 24 abuts against the end face of the second connecting portion 24 near the first connecting portion 23.

[0046] Reference Figure 4 A movable hole 352, connecting to a limiting groove 241, is formed on the outer surface of the metal gasket 32. The movable hole 352 extends to the second operating rod 34. A movable strip 353 is slidably connected within the movable hole 352. A first magnet 354 is fixedly connected to the surface of the movable strip 353 near the second operating rod 34, and a second magnet 355 is fixedly connected to the surface of the fixed rod 351 near the movable strip 353. The first magnet 354 can attract the second magnet 355, meaning that the movable strip 353 can drive the fixed rod 351 to slide within the fixed hole 35.

[0047] Reference Figure 4 An active groove 357 is formed on the wall of the active hole 352, and the active groove 357 extends along the length direction of the active hole 352. An active block 358 is fixedly connected to the surface of the active bar 353. An active spring 359 is fixedly connected to the surface of the active block 358 near the second operating rod 34. The surface of the active spring 359 away from the active block 358 is fixedly connected to the active groove 357, and the active spring 359 moves away from the second operating rod 34 through the active block 358.

[0048] Reference Figure 4 When the fixed rod 351 is located within the movable hole 352, the fixed rod 351 can disengage from the groove 332. At this time, the movable strip 353 remains within the movable hole 352, thus unlocking the fixed rod 351 from the fixed strip 331. When the fixed rod 351 moves into the groove 332, the fixed rod 351 can lock the fixed strip 331.

[0049] Reference Figure 4 A movable inclined surface 356 is formed on the surface of the movable strip 353 near the limiting sleeve 231. The distance between the movable inclined surface 356 and the first connecting part 23 gradually decreases along the direction from the movable strip 353 to the fixed rod 351, and the movable inclined surface 356 is located on the moving path of the limiting sleeve 231. When the limiting sleeve 231 is inserted into the limiting groove 241, the limiting sleeve 231 drives the movable strip 353 to move through the movable inclined surface 356, allowing the movable strip 353 to push the fixed rod 351 to move into the groove 332. At this time, the fixed rod 351 does not protrude from the outer surface of the second operating rod 34, that is, the fixed rod 351 will not affect the sliding of the second operating rod 34, so that the fixed rod 351 limits the fixed strip 331.

[0050] Reference Figure 4 and Figure 5 The second operating lever 34 includes an operating sleeve 36 and an operating bar 37. The operating sleeve 36 is fitted onto the outer surface of the operating bar 37, and the operating bar 37 is used to open and close the valve body 1. A fixing groove 341 is formed on the operating sleeve 36, and one end of the operating bar 37 can extend into the fixing groove 341.

[0051] Reference Figure 4 and Figure 6A rotating rod 371 is fixedly connected to the end face of the operating bar 37. A limiting ring is welded to the outer surface of the rotating rod 371 to prevent the operating sleeve 36 and the operating bar 37 from separating. A placement groove 335 for inserting the rotating rod 371 is formed on the surface of the fixing bar 331 away from the first operating rod 33, and the placement groove 335 is connected to the groove 332. When the fixing bar 331 is inserted into the fixing groove 341, the rotating rod 371 can be located in the placement groove 335. When the rotating rod 371 rotates, it can drive the operating bar 37 to rotate, so that the operating bar 37 is changed to the position with the greatest fluid impact force, thereby increasing the service life of the operating bar 37.

[0052] Reference Figure 4 , Figure 5 and Figure 6 Four receiving blocks 372 are fixedly connected to the outer surface of the rotating rod 371, and the four receiving blocks 372 are arranged in a circumferential array along the rotating rod 371. A rotating component is provided in the placement groove 335 to realize the rotation of the rotating rod 371. The rotating component includes a movable magnet 374 and a rotating magnet 334. A receiving groove 373 is formed on the surface of the receiving block 372 facing another receiving block 372, and the movable magnet 374 is fixedly connected in the receiving groove 373. A slot 333 is formed on the groove wall of the placement groove 335, and the rotating magnet 334 is fixedly connected in the slot 333. The rotating magnet 334 can attract the movable magnet 374, that is, the rotating magnet 334 can drive the receiving block 372 to move, so as to realize the rotation of the rotating rod 371.

[0053] Reference Figure 4 , Figure 5 and Figure 6 The receiving block 372 is located on the moving path of the fixed rod 351. When the fixed rod 351 is in the groove 332, it can be inserted into the placement slot 335, allowing it to push one receiving block 372 to move, thus rotating the rotating rod 371. At this time, the fixed rod 351 is on the moving path of the next receiving block 372, which abuts against the fixed rod 351, thus restricting the movement of the receiving block 372 and the rotation of the rotating rod 371. When the fixed rod 351 disengages from the groove 332, the rotating magnet 334 can move the receiving block 372 by moving the magnet 374, allowing it to move so that the next receiving block 372 is on the moving path of the fixed rod 351 inserted into the groove 332. At this time, the rotating magnet 334 attracts the moving magnet 374, thus restricting the continued movement of the receiving block 372 and stopping the rotating rod 371 from rotating.

[0054] The implementation principle of Example 2 is as follows: First, the operator inserts the fixing strip 331 into the fixing groove 341, so that the rotating rod 371 is located in the placement groove 335. Then, the operator installs the valve stem 3 on the second connecting part 24 and the first connecting part 23 on the second connecting part 24, so that the limiting sleeve 231 is inserted into the limiting groove 241. The limiting sleeve 231 drives the movable strip 353 to move through the movable inclined surface 356, so that the movable strip 353 drives the fixing rod 351 to move, so that the fixing rod 351 is inserted into the groove 332, so that the fixing rod 351 abuts against the receiving block 372, and the fixing rod 351 can restrict the rotation of the rotating rod 371.

[0055] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A bellows gate valve, comprising a valve body (1) and a valve cover (2), wherein the valve cover (2) is fixedly connected to the valve body (1), a valve stem (3) is slidably connected to the valve cover (2), the valve stem (3) is used to open and close the valve body (1), and a sealing element (212) is provided on the valve cover (2), characterized in that: A bellows (31) is fitted on the valve stem (3), and the bellows (31) is located on the side of the seal (212) close to the valve body (1); A metal gasket (32) is fixedly connected to the bellows (31), and an annular groove (213) for the bellows (31) to move is provided on the valve body (1). The metal gasket (32) is located on the groove wall of the annular groove (213) away from the valve body (1). The valve stem (3) includes a first operating rod (33) and a second operating rod (34). The bellows (31) is disposed on the second operating rod (34). The first operating rod (33) is located on the side of the second operating rod (34) away from the valve body (1). The first operating rod (33) is provided with a fixing strip (331). The second operating rod (34) is provided with a fixing groove (341) for inserting the fixing strip (331). The second operating rod (34) is provided with a fixing hole (35) communicating with the fixing groove (341). A fixing rod (351) is slidably connected in the fixing hole (35). The fixing strip (331) is provided with a groove (332) for inserting the fixing rod (351). When the fixing rod (351) is located in the groove (332), the fixing strip (331) is located in the fixing groove (341). At this time, the first operating rod (33) is fixed on the second operating rod (34). The outer surface of the metal gasket (32) is provided with a movable hole (352), and a movable strip (353) is slidably connected in the movable hole (352). A first magnet (354) is provided on the movable strip (353), and a second magnet (355) is provided on the fixed rod (351). The first magnet (354) can attract the second magnet (355). When one end of the movable strip (353) abuts against the second operating rod (34), the fixed rod (351) is inserted into the groove (332). When the fixed rod (351) is located in the movable hole (352), the fixed rod (351) can disengage from the groove (332). The valve cover (2) includes a first connecting part (23) and a second connecting part (24). The first connecting part (23) is located on the side of the second connecting part (24) away from the valve body (1). The annular groove (213) is formed on the second connecting part (24). The annular groove (213) passes through the second connecting part (24) along the length direction of the second connecting part (24). The metal gasket (32) abuts against the surface of the first connecting part (23). The first connecting part (23) is provided with a limiting sleeve (231), and the movable bar (353) is provided with a movable inclined surface (356) on the surface away from the fixed rod (351). The distance between the movable inclined surface (356) and the fixed rod (351) gradually increases along the direction from the first connecting part (23) to the second connecting part (24). The movable inclined surface (356) is located on the moving path of the limiting sleeve (231). When the limiting sleeve (231) abuts against the second connecting part (24), the movable bar (353) is fully inserted into the movable hole (352).

2. The bellows stop valve according to claim 1, characterized in that: The second operating lever (34) includes an operating sleeve (36) and an operating bar (37). The operating sleeve (36) is rotatably connected to the operating bar (37). The operating bar (37) is used to open and close the valve body (1). The fixing groove (341) is opened on the operating sleeve (36). The operating bar (37) can be located in the fixing groove (341). The outer surface of the operating bar (37) is provided with a plurality of receiving blocks (372). The plurality of receiving blocks (372) are distributed along the circumference of the operating bar (37). The receiving blocks (372) are located on the moving path of the fixing rod (351). The operating sleeve (36) is provided with a rotating component for driving the operating bar (37) to rotate. When the fixing rod (351) is located in the groove (332), the fixing rod (351) restricts the rotation of the operating bar (37).

3. A bellows shut-off valve according to claim 2, characterized in that: The rotating component includes a rotating magnet (334) and a movable magnet (374). The rotating magnet (334) is disposed on the operating sleeve (36), and the movable magnet (374) is disposed on the receiving block (372). The rotating magnet (334) attracts the movable magnet (374). When the fixed rod (351) is located in the groove (332), the fixed rod (351) pushes the receiving block (372) to move to realize the rotation of the operating bar (37). At this time, the rotating magnet (334) attracts the movable magnet (374), and the fixed rod (351) abuts against the next receiving block (372).

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