An ultra-low temperature stop valve with a check function

Abstract

The present invention belongs to the field of stop valves, in particular to an ultra-low temperature stop valve with a check function. In view of the problems that the existing stop valve cannot achieve the check effect when the valve is closed, and cannot be monitored when the valve returns liquid, the type and flow of the reflux liquid cannot be quickly understood, which increases the difficulty of maintenance of the device, the following scheme is proposed, which includes a valve body, the top of the valve body is fixedly connected to a cover plate by bolts, and two ends of the valve body are respectively provided with a water inlet and a water outlet, and a connecting hole is provided inside the valve body, and the connecting hole is used to connect the water inlet and the water outlet, and a control component for controlling the opening and closing of the valve is provided on the top of the cover plate. In the present invention, after closing the valve, the electromagnet is turned off, and multiple arc blocks are inserted between multiple strip plates to prevent liquid backflow. When the weight gradually increases, the buzzer alarm starts to alarm, reminding the staff, and the reflux liquid flows into the interior of the sampling tube through the L-shaped hole to complete the sampling process.

Description

Technical Field

[0001] The present invention relates to the technical field of stop valves, and in particular to an ultra-low temperature stop valve with a check function. Background Art

[0002] The globe valve, also known as the stop valve, is the most widely used valve. The reason why it is so popular is that the friction between the sealing surfaces during opening and closing is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is suitable not only for medium and low pressures, but also for high pressures. The closing principle of the globe valve is to rely on the pressure of the valve stem to make the valve disc sealing surface fit tightly with the valve seat sealing surface to prevent the flow of medium.

[0003] After searching, the utility model with announcement number CN221145322U provides a flange stop valve, but the stop valve still has the following defects when in use:

[0004] 1. When the valve is closed, the check effect cannot be achieved, and when the valve returns liquid, it cannot be monitored, which may lead to the risk of leakage;

[0005] 2. When the valve returns liquid, it is impossible to quickly understand the type and flow rate of the return liquid, and thus it is impossible to quickly understand the return liquid location, which increases the difficulty of maintenance of the device. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art that when the valve is closed, the check effect cannot be achieved, and when the valve returns liquid, monitoring cannot be performed, which may lead to the risk of leakage. When the valve returns liquid, the type and flow rate of the returning liquid cannot be quickly understood, and the return liquid position cannot be quickly understood, which increases the difficulty of maintenance of the device. A super-low temperature stop valve with a check function is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A cryogenic stop valve with a check function comprises a valve body, a cover plate fixedly connected to the top of the valve body by bolts, a water inlet and a water outlet respectively provided at both ends of the valve body, a connecting hole provided inside the valve body for connecting the water inlet and the water outlet, and a control assembly for controlling the opening and closing of the valve provided on the top of the cover plate;

[0009] A mounting hole is provided at the bottom of the valve body, a circular cylinder is provided inside the mounting hole, and a monitoring component for monitoring reflux liquid is provided inside the circular cylinder;

[0010] A fixing ring is provided inside the connecting hole, and a brake assembly for sealing the valve is provided at the bottom of the fixing ring;

[0011] The bottom of the circular cylinder is rotatably connected to a rotating seat, and a sampling component for sampling the reflux liquid is arranged inside the rotating seat.

[0012] In one possible design, the control assembly includes a mounting seat fixedly connected to the inside of the cover plate, the top of the cover plate is fixedly connected to a fixing plate by bolts, the internal thread of the fixing plate is penetrated by a threaded rod, the top of the threaded rod is provided with an operating panel, the inside of the threaded rod is integrally formed with a first round rod, the first round rod penetrates the mounting seat, the bottom of the first round rod is provided with a valve flap, the bottom of the valve flap is provided with multiple strip plates, and the valve flap is used in conjunction with a fixing ring.

[0013] In one possible design, the monitoring assembly includes a piston plate slidably connected to the inside of a circular cylinder, a sealing gasket is fixedly connected to the top of the piston plate, a through hole is opened on the top of the circular cylinder, the through hole is used in conjunction with the sealing gasket, a damper is provided on the bottom inner wall of the circular cylinder, one end of the damper is fixedly connected to the bottom of the piston plate, two symmetrically arranged electromagnets are fixedly connected to the top inner wall of the circular cylinder, and the electromagnets are used in conjunction with the piston plate.

[0014] In one possible design, two symmetrically arranged support rods are fixedly connected to the inner wall of the bottom of the circular cylinder, a convex plate is fixedly connected to one side of one of the support rods, an elastic switch is provided at the bottom of the piston plate, the elastic switch is used in conjunction with the convex plate, and a buzzer alarm is provided at the bottom of the circular cylinder, which is electrically connected to the elastic switch.

[0015] In one possible design, the brake assembly includes a rotating ring rotatably connected to the bottom of the fixed ring, the inner wall of the rotating ring is integrally formed with a plurality of protrusions, the bottom of the fixed ring is provided with a plurality of sliding grooves, a slider is slidingly connected inside the sliding groove, a first spring is fixedly connected between one side of the slider and the inner wall of one side of the sliding groove, an arc block is fixedly connected to the bottom of the slider, the arc block is located inside the rotating ring and is used in conjunction with the protrusions.

[0016] In a possible design, the brake assembly also includes a connecting rod fixedly connected to one side of the bottom of the rotating ring, the bottom of the connecting rod is fixedly connected to an arc-shaped plate, one side of the arc-shaped plate is provided with an inclined groove, the top of the circular cylinder is fixedly connected to a circular ring frame, the outer wall of the circular ring frame is provided with multiple water inlet holes, the inside of the circular ring frame is slidably connected to a circular plate, the bottom of the circular plate is fixedly connected to a push rod, the push rod is used in conjunction with a sealing gasket, and one side of the circular plate is fixedly connected to an insertion rod, the insertion rod is used in conjunction with the inclined groove.

[0017] In one possible design, the sampling assembly includes a plurality of vertical grooves opened on the outer wall of the rotating seat, a placement plate is slidably connected to the interior of the vertical groove, a second round rod is fixedly connected to one side of the placement plate, one end of the second round rod slides through the rotating seat and is fixedly connected to a limiting block, a same tension spring is fixedly connected between one side of the limiting block and one side of the rotating seat, and the tension spring is sleeved on the second round rod.

[0018] In one possible design, a placement groove is provided inside the placement plate, a sampling tube is embedded inside the placement groove, an L-shaped hole is provided inside the circular tube, the L-shaped hole is used in conjunction with the sampling tube, and an operation hole is provided on one side of the placement plate, and the operation hole is connected to the placement groove.

[0019] In a possible design, a limiting ring is provided on the rotating sleeve of the outer wall of the rotating seat, a groove is provided on one side of the limiting ring, a same pull plate is slidably connected between the inner walls on both sides of the groove, a handle is fixedly connected to one side of the pull plate, two symmetrically arranged second springs are fixedly connected between the bottom of the pull plate and the bottom inner wall of the groove, and the pull plate and the limiting ring are both located on one side of multiple placement plates.

[0020] In the present application, when in use, fluid is input from the water inlet, passes through the connecting hole and the fixing ring, and finally discharged through the water outlet. When the valve needs to be closed, the operating disk can be rotated, and the operating disk drives the threaded rod and the first round rod to rotate. The threaded rod rotates and moves downward inside the fixing plate, and the first round rod drives the valve disc and the strip plate to rotate and move downward. At this time, the valve disc moves to the top of the fixing ring and seals the connecting hole.

[0021] At this time, the electromagnet is turned off. At this time, the electromagnet no longer attracts the piston plate. The piston plate and the sealing gasket move downward under the action of gravity. However, due to the presence of the damper, the piston plate still has a certain height. At this time, the push rod and the circular plate fall under the action of gravity, and the circular plate drives the insertion rod to fall. The insertion rod moves along the inclined slot, which can drive the arc plate to rotate. The arc plate can drive the connecting rod to rotate, and the connecting rod drives the rotating ring to rotate. The rotating ring drives multiple protrusions to rotate. The protrusions push the multiple arc blocks to approach each other, and the multiple arc blocks drive the slider to move. The slider squeezes the first spring, and the multiple arc blocks are inserted between the multiple strip plates to prevent the valve disc from loosening and prevent liquid backflow.

[0022] If there is fluid backflow, the fluid will enter the inside of the circular cylinder. When the weight gradually increases, the piston plate gradually moves down, and the backflowing liquid will enter the inside of the L-shaped hole. When the piston plate moves down to the top of the support rod, the support rod supports the piston plate, and the convex plate contacts the elastic switch, which can trigger the buzzer alarm. The buzzer alarm starts to sound and alert the staff.

[0023] And when in use, if it is necessary to sample the refluxed liquid, the rotating seat can be rotated. At this time, the top of the rotating seat no longer blocks the bottom of the L-shaped hole, and one of the sampling cylinders is moved below the L-shaped hole. At this time, the refluxed liquid flows into the interior of the sampling cylinder through the L-shaped hole, completing the sampling process;

[0024] And when the appropriate sample moves to one side of the groove, the pull plate can be moved vertically downward by the handle first. At this time, the pull plate squeezes the second spring and no longer blocks the placement plate. The placement plate carrying the sampling tube moves laterally under the tension of the tension spring, and the placement plate slides out from the inside of the vertical groove. At this time, the operating hole leaks out, and the placement plate moves to the outside of the circular cylinder, which can push the sampling tube upward, and then the sampling tube can be easily removed from the inside of the placement groove.

[0025] Beneficial effects:

[0026] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of braking the valve disc when the valve is closed through the brake assembly, thereby improving the stability of the connection between the valve disc and the fixing ring and preventing fluid backflow;

[0027] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of monitoring liquid reflux through a monitoring component, and can alarm when the weight of the reflux liquid reaches a certain level, thereby reminding the staff;

[0028] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of sampling the reflux liquid through the sampling component, and can perform multiple samplings through the setting of multiple sampling tubes, and can also help to remove the sampling tubes by popping out the placement plate.

[0029] In the present invention, after closing the valve, the electromagnet is turned off. At this time, the electromagnet no longer absorbs the piston plate. Multiple arc blocks are inserted between multiple strip plates to prevent the valve disc from loosening and prevent liquid reflux. When the weight gradually increases, the piston plate gradually moves down, and the buzzer alarm starts to alarm to remind the staff. The reflux liquid flows into the interior of the sampling tube through the L-shaped hole, completing the sampling process. The sampling tube is helped to be taken out by popping out the placement plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional structural diagram of a cryogenic stop valve with a check function proposed by the present invention;

[0031] Figure 2 This is a schematic diagram of a three-dimensional cross-sectional structure of a cryogenic stop valve with a non-return function proposed by the present invention;

[0032] Figure 3This is a schematic diagram of the explosion structure of a cryogenic stop valve with a non-return function proposed by the present invention;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of the fixed ring and the rotating ring in the ultra-low temperature stop valve with a non-return function proposed by the present invention;

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of the rotating ring and the arc-shaped block in the ultra-low temperature stop valve with a non-return function proposed by the present invention;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the circular plate and water inlet hole in a cryogenic stop valve with a check function proposed by the present invention;

[0036] Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of a circular cylinder in a cryogenic stop valve with a non-return function proposed by the present invention;

[0037] Figure 8 This is a three-dimensional structural diagram of a cryogenic shut-off valve damper with a non-return function and a buzzer alarm proposed by the present invention;

[0038] Figure 9 This is a three-dimensional structural diagram of a limit ring and a rotating seat in a cryogenic stop valve with a non-return function proposed by the present invention;

[0039] Figure 10 This is a schematic diagram of the three-dimensional structure of a rotating seat in a cryogenic stop valve with a non-return function proposed by the present invention.

[0040] In the figure: 1. valve body; 2. cover plate; 3. fixing plate; 4. threaded rod; 5. operating panel; 6. first round rod; 7. mounting seat; 8. valve disc; 9. water outlet; 10. fixing ring; 11. round cylinder; 12. curved plate; 13. plug rod; 14. water inlet; 15. connecting hole; 16. mounting hole; 17. strip plate; 18. inclined groove; 19. curved block; 20. slide; 21. rotating ring; 22. connecting rod; 23. first spring; 24. slider; 25. protrusion; 26. circular plate; 27. push rod ; 28. Ring rack; 29. ​​Water inlet hole; 30. Electromagnet; 31. Sealing gasket; 32. Piston plate; 33. L-shaped hole; 34. Support rod; 35. Limiting ring; 36. Rotating seat; 37. Damper; 38. Protruding plate; 39. Buzzer alarm; 40. Elastic switch; 41. Pull plate; 42. Handle; 43. Second spring; 44. Groove; 45. Tension spring; 46. Second round rod; 47. Sampling tube; 48. Operating hole; 49. Placement slot; 50. Vertical slot; 51. Limiting block; 52. Placement plate. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1

[0043] Reference Figure 1-10 A cryogenic stop valve with a check function is used in the field of stop valves, comprising: a valve body 1, a cover plate 2 is fixedly connected to the top of the valve body 1 by bolts, a water inlet 14 and a water outlet 9 are respectively provided at both ends of the valve body 1, a connecting hole 15 is provided inside the valve body 1, the connecting hole 15 is used to connect the water inlet 14 and the water outlet 9, a control component for controlling the opening and closing of the valve is provided on the top of the cover plate 2, the control component includes a mounting seat 7 fixedly connected to the inside of the cover plate 2, a fixing plate 3 is fixedly connected to the top of the cover plate 2 by bolts, a threaded rod 4 is passed through the internal thread of the fixing plate 3, an operating panel 5 is provided on the top of the threaded rod 4, and the inside of the threaded rod 4 is integrally formed. There is a first round rod 6, which passes through the mounting seat 7. A valve disc 8 is provided at the bottom of the first round rod 6. A plurality of strip plates 17 are provided at the bottom of the valve disc 8. The valve disc 8 is used in conjunction with the fixing ring 10. The fluid is input from the water inlet 14, passes through the connecting hole 15 and the fixing ring 10, and is finally discharged through the water outlet 9. When the valve needs to be closed, the operating disk 5 can be rotated. The operating disk 5 drives the threaded rod 4 and the first round rod 6 to rotate. The threaded rod 4 rotates and moves downward inside the fixing plate 3. The first round rod 6 drives the valve disc 8 and the strip plates 17 to rotate and move downward. At this time, the valve disc 8 moves to the top of the fixing ring 10 and seals the connecting hole 15.

[0044] A mounting hole 16 is provided at the bottom of the valve body 1, a circular cylinder 11 is provided inside the mounting hole 16, a monitoring component for monitoring reflux liquid is provided inside the circular cylinder 11, the monitoring component includes a piston plate 32 slidably connected to the inside of the circular cylinder 11, a sealing gasket 31 is fixedly connected to the top of the circular cylinder 11, a through hole is provided at the top of the circular cylinder 11, the through hole and the sealing gasket 31 are used in conjunction with each other, a damper 37 is provided on the bottom inner wall of the circular cylinder 11, one end of the damper 37 is fixedly connected to the bottom of the piston plate 32, two symmetrically arranged electromagnets 30 are fixedly connected to the top inner wall of the circular cylinder 11, the electromagnet 30 is used in conjunction with the piston plate 32, and two symmetrically arranged support rods 34 are fixedly connected to the bottom inner wall of the circular cylinder 11. A convex plate 38 is fixedly connected to one side of one support rod 34, and an elastic switch 40 is provided at the bottom of the piston plate 32. The elastic switch 40 is used in conjunction with the convex plate 38. A buzzer alarm 39 is provided at the bottom of the circular cylinder 11. The buzzer alarm 39 is electrically connected to the elastic switch 40. If there is fluid backflow, the fluid will enter the interior of the circular cylinder 11. When the weight gradually increases, the piston plate 32 gradually moves downward, and the refluxed liquid will enter the interior of the L-shaped hole 33. When the piston plate 32 moves down to the top of the support rod 34, the support rod 34 supports the piston plate 32, and the convex plate 38 conflicts with the elastic switch 40. At this time, the buzzer alarm 39 can be triggered, and the buzzer alarm 39 starts to alarm to remind the staff;

[0045] The interior of the connecting hole 15 is provided with a fixing ring 10, and the bottom of the fixing ring 10 is provided with a brake assembly for sealing the valve, the brake assembly includes a rotating ring 21 rotatably connected to the bottom of the fixing ring 10, the inner wall of the rotating ring 21 is integrally formed with a plurality of protrusions 25, the bottom of the fixing ring 10 is provided with a plurality of slide grooves 20, the interior of the slide groove 20 is slidably connected with a slider 24, one side of the slider 24 is fixedly connected to the inner wall of one side of the slide groove 20 with the same first spring 23, the bottom of the slider 24 is fixedly connected to an arc block 19, the arc block 19 is located in the interior of the rotating ring 21 and cooperates with the protrusion 25, the brake assembly also includes a connecting rod 22 fixedly connected to one side of the bottom of the rotating ring 21, the bottom of the connecting rod 22 is fixedly connected to the arc plate 12, one side of the arc plate 12 is provided with an inclined groove 18, the top of the circular cylinder 11 is fixedly connected to a circular frame 28, the outer wall of the circular frame 28 is provided with a plurality of water inlet holes 29, the interior of the ring frame 28 is slidably connected with a circular plate 26, the circular plate 26 The bottom is fixedly connected with a push rod 27, which is used in conjunction with a sealing gasket 31. One side of the circular plate 26 is fixedly connected with an insertion rod 13, which is used in conjunction with the inclined slot 18. At this time, the electromagnet 30 is closed. At this time, the electromagnet 30 no longer adsorbs the piston plate 32. The piston plate 32 and the sealing gasket 31 move downward under the action of gravity. However, due to the presence of the damper 37, the piston plate 32 still has a certain height. At this time, the push rod 27 and the circular plate 26 fall under the action of gravity, and the circular plate 26 drives the insertion rod 13 When the valve disc 8 is lowered, the insertion rod 13 moves along the inclined groove 18, thereby driving the arc plate 12 to rotate. The arc plate 12 can drive the connecting rod 22 to rotate, the connecting rod 22 drives the rotating ring 21 to rotate, the rotating ring 21 drives the multiple protrusions 25 to rotate, the protrusions 25 push the multiple arc blocks 19 to approach each other, the multiple arc blocks 19 drive the slider 24 to move, the slider 24 squeezes the first spring 23, and the multiple arc blocks 19 are inserted between the multiple strip plates 17, which can prevent the valve disc 8 from loosening and prevent liquid backflow;

[0046] The bottom of the circular cylinder 11 is rotatably connected to a rotating seat 36, and a sampling assembly for sampling the reflux liquid is provided inside the rotating seat 36. The sampling assembly includes a plurality of vertical slots 50 opened on the outer wall of the rotating seat 36, and a placement plate 52 is slidably connected inside the vertical slot 50. One side of the placement plate 52 is fixedly connected to a second round rod 46. One end of the second round rod 46 slides through the rotating seat 36 and is fixedly connected to a limiting block 51. One side of the limiting block 51 is fixedly connected to one side of the rotating seat 36 with the same tension spring 45. The tension spring 45 is sleeved on the second round rod 46. The placement plate 52 is opened inside. A placement slot 49 is provided, and a sampling tube 47 is embedded in the interior of the placement slot 49. An L-shaped hole 33 is provided inside the circular cylinder 11, and the L-shaped hole 33 is used in conjunction with the sampling tube 47. An operation hole 48 is provided on one side of the placement plate 52, and the operation hole 48 is connected to the placement slot 49. When in use, if it is necessary to sample the reflux liquid, the rotating seat 36 can be rotated. At this time, the top of the rotating seat 36 no longer blocks the bottom of the L-shaped hole 33, and one of the sampling tubes 47 is moved to the bottom of the L-shaped hole 33. At this time, the reflux liquid flows into the interior of the sampling tube 47 through the L-shaped hole 33, completing the sampling process.

[0047] Example 2

[0048] refer to Figure 9-10 , an improvement on the basis of Example 1: a limiting ring 35 is rotatably sleeved on the outer wall of the rotating seat 36, and a groove 44 is opened on one side of the limiting ring 35. A same pulling plate 41 is slidably connected between the inner walls of both sides of the groove 44, and a handle 42 is fixedly connected to one side of the pulling plate 41. Two symmetrically arranged second springs 43 are fixedly connected between the bottom of the pulling plate 41 and the bottom inner wall of the groove 44. The pulling plate 41 and the limiting ring 35 are both located on one side of the multiple placement plates 52, and when a suitable sample is moved to one side of the groove 44, the pulling plate 41 can be moved vertically downward by the handle 42 first. At this time, the pulling plate 41 squeezes the second spring 43 and does not block the placement plate 52. The placement plate 52 carrying the sampling tube 47 moves horizontally under the tension of the tension spring 45, and the placement plate 52 slides out from the inside of the vertical groove 50. At this time, the operation hole 48 leaks out, and the placement plate 52 moves to the outside of the circular cylinder 11, and the sampling tube 47 can be pushed upward, so that the sampling tube 47 can be easily removed from the inside of the placement groove 49.

[0049] However, as is well known to those skilled in the art, the working principles and wiring methods of the electromagnet 30, elastic switch 40 and buzzer alarm 39 are commonplace, and are all conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A cryogenic stop valve with a non-return function, characterized in that: include: A valve body (1), the top of the valve body (1) is fixedly connected to a cover plate (2) by bolts, a water inlet (14) and a water outlet (9) are respectively provided at both ends of the valve body (1), a connecting hole (15) is provided inside the valve body (1), and the connecting hole (15) is used to connect the water inlet (14) and the water outlet (9), and a control component for controlling the opening and closing of the valve is provided on the top of the cover plate (2); The bottom of the valve body (1) is provided with a mounting hole (16), a circular cylinder (11) is provided inside the mounting hole (16), and a monitoring component for monitoring reflux liquid is provided inside the circular cylinder (11); A fixing ring (10) is provided inside the connecting hole (15), and a brake assembly for sealing the valve is provided at the bottom of the fixing ring (10); The bottom of the circular cylinder (11) is rotatably connected to a rotating seat (36), and a sampling component for sampling the reflux liquid is provided inside the rotating seat (36).

2. The ultra-low temperature stop valve with a check function according to claim 1, characterized in that: The control assembly includes a mounting seat (7) fixedly connected to the inside of the cover plate (2), the top of the cover plate (2) is fixedly connected to a fixing plate (3) by bolts, the internal thread of the fixing plate (3) is penetrated by a threaded rod (4), the top of the threaded rod (4) is provided with an operating panel (5), the inside of the threaded rod (4) is integrally formed with a first round rod (6), the first round rod (6) penetrates the mounting seat (7), the bottom of the first round rod (6) is provided with a valve flap (8), the bottom of the valve flap (8) is provided with a plurality of strip plates (17), and the valve flap (8) is used in conjunction with a fixing ring (10).

3. The ultra-low temperature stop valve with a check function according to claim 1, characterized in that: The monitoring component includes a piston plate (32) slidably connected to the inside of a circular cylinder (11), a sealing gasket (31) is fixedly connected to the top of the piston plate (32), a through hole is opened on the top of the circular cylinder (11), and the through hole is used in conjunction with the sealing gasket (31), a damper (37) is provided on the bottom inner wall of the circular cylinder (11), one end of the damper (37) is fixedly connected to the bottom of the piston plate (32), and two symmetrically arranged electromagnets (30) are fixedly connected to the top inner wall of the circular cylinder (11), and the electromagnets (30) are used in conjunction with the piston plate (32).

4. The ultra-low temperature stop valve with a check function according to claim 3, characterized in that: Two symmetrically arranged support rods (34) are fixedly connected to the inner wall of the bottom of the circular cylinder (11), one side of one of the support rods (34) is fixedly connected to a convex plate (38), an elastic switch (40) is provided at the bottom of the piston plate (32), and the elastic switch (40) is used in conjunction with the convex plate (38), and a buzzer alarm (39) is provided at the bottom of the circular cylinder (11), and the buzzer alarm (39) is electrically connected to the elastic switch (40).

5. The ultra-low temperature stop valve with a check function according to claim 1, characterized in that: The brake assembly includes a rotating ring (21) rotatably connected to the bottom of the fixed ring (10), the inner wall of the rotating ring (21) is integrally formed with a plurality of protrusions (25), the bottom of the fixed ring (10) is provided with a plurality of slide grooves (20), the interior of the slide groove (20) is slidably connected with a slider (24), one side of the slider (24) and the inner wall of one side of the slide groove (20) are fixedly connected with the same first spring (23), the bottom of the slider (24) is fixedly connected with an arc block (19), the arc block (19) is located inside the rotating ring (21) and is used in conjunction with the protrusions (25).

6. The ultra-low temperature stop valve with a check function according to claim 4, characterized in that: The brake assembly further comprises a connecting rod (22) fixedly connected to one side of the bottom of the rotating ring (21); the bottom of the connecting rod (22) is fixedly connected to an arc plate (12); one side of the arc plate (12) is provided with an inclined groove (18); the top of the circular cylinder (11) is fixedly connected to an annular frame (28); the outer wall of the annular frame (28) is provided with a plurality of water inlet holes (29); the inside of the annular frame (28) is slidably connected to a circular plate (26); the bottom of the circular plate (26) is fixedly connected to a push rod (27); the push rod (27) is used in conjunction with a sealing gasket (31); one side of the circular plate (26) is fixedly connected to an insertion rod (13); the insertion rod (13) is used in conjunction with the inclined groove (18).

7. The cryogenic stop valve with a check function according to claim 1, characterized in that: The sampling assembly includes a plurality of vertical grooves (50) opened on the outer wall of the rotating seat (36), the interior of the vertical grooves (50) is slidably connected to a placement plate (52), one side of the placement plate (52) is fixedly connected to a second round rod (46), one end of the second round rod (46) slides through the rotating seat (36) and is fixedly connected to a limiting block (51), one side of the limiting block (51) and one side of the rotating seat (36) are fixedly connected with the same tension spring (45), and the tension spring (45) is sleeved on the second round rod (46).

8. The ultra-low temperature stop valve with a check function according to claim 7, characterized in that: A placement groove (49) is provided inside the placement plate (52), a sampling tube (47) is embedded inside the placement groove (49), an L-shaped hole (33) is provided inside the circular cylinder (11), the L-shaped hole (33) is used in conjunction with the sampling tube (47), an operating hole (48) is provided on one side of the placement plate (52), and the operating hole (48) is connected to the placement groove (49).

9. The ultra-low temperature stop valve with a check function according to claim 8, characterized in that: The outer wall of the rotating seat (36) is rotatably sleeved with a limiting ring (35), a groove (44) is opened on one side of the limiting ring (35), a same pull plate (41) is slidably connected between the inner walls on both sides of the groove (44), a handle (42) is fixedly connected to one side of the pull plate (41), two symmetrically arranged second springs (43) are fixedly connected between the bottom of the pull plate (41) and the bottom inner wall of the groove (44), and the pull plate (41) and the limiting ring (35) are both located on one side of the multiple placement plates (52).

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