Self-pressure-relief explosion-proof stop valve

Abstract

The utility model relates to the technical field of stop valves, and discloses a self-pressure-relief explosion-proof stop valve which comprises a valve body, the top of the valve body penetrates through and is fixedly connected with a fixing cylinder, the top of the fixing cylinder is fixedly connected with a second flange, the top of the second flange is provided with a rubber pad, the top of the rubber pad is provided with a valve cover, and the valve cover is fixedly connected with the valve body. A packing block penetrates through and is fixedly connected to the middle of the top of the valve deck, a gland penetrates through and is arranged in the middle of the top of the packing block, a valve rod penetrates through and is slidably connected to the top of the gland, a first nut penetrates through and is in threaded connection with the top of the outer ring of the valve rod, and fixing blocks are fixedly connected to the two sides of the outer wall of the first nut. According to the utility model, firstly, the valve can be ensured not to leak in a closed state through internal sealing, and external media can be prevented from entering the valve through external sealing, so that the reliability and the stability of long-time operation of the valve are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a self-pressure-releasing explosion-proof stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. When the stop valve is used to cut off the fluid in the pipeline, the fluid in the stop valve usually exerts a certain degree of pressure on the stop valve. When the internal fluid pressure exceeds the explosion-proof threshold, the stop valve may burst and be damaged.

[0003] After searching, the existing Chinese patent announcement number is: CN220365997U, which provides a self-pressure relief explosion-proof stop valve. This patent quickly and accurately adjusts the pressure value of the pressure relief according to different fluids. When the internal fluid pressure exceeds the explosion-proof threshold, it can quickly relieve pressure to ensure the safety of use.

[0004] Although the above patent can quickly and accurately adjust the pressure value of pressure relief for different fluids, the above self-pressure relief explosion-proof stop valve still has the following problems: the sealing performance of the sealing surface is likely to be substandard, and the medium in the valve body flows out from the gap of the sealing surface.

[0005] In view of the above problems, a self-pressure-relieving explosion-proof stop valve is proposed. Utility Model Content

[0006] The utility model aims to provide a self-decompression explosion-proof stop valve, which solves the problem of poor sealing performance in the background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-depressurized explosion-proof stop valve, comprising a valve body, a fixing cylinder passing through and fixedly connected to the top of the valve body, a second flange being fixedly connected to the top of the fixing cylinder, a rubber pad being arranged on the top of the second flange, a valve cover being arranged on the top of the rubber pad, a stuffing block passing through and fixedly connected to the middle of the top of the valve cover, a pressure cap passing through and arranged on the middle of the top of the stuffing block, a valve stem passing through and slidably connected to the top of the pressure cap, a first nut passing through and threadedly connected to the top of the outer ring of the valve stem, fixing blocks being fixedly connected to both sides of the outer wall of the first nut, a pressure relief assembly being arranged on the bottom of the valve body, a first flange being fixedly connected to the left and right sides of the valve body, and a valve plate being fixedly connected to both sides of the inner wall of the valve body.

[0008] By adopting the above technical solution, when the stop valve is in a closed state, the valve core and the valve plate will prevent the fluid from passing through the pipeline, thereby achieving the purpose of cutting off the fluid; and when the stop valve is in an open state, the fluid can flow freely through the pipeline.

[0009] As a further description of the above technical solution: the pressure relief assembly includes a pressure relief cylinder, which penetrates the valve body and is threadedly connected, and adjustment holes are provided on the front and rear sides of the pressure relief cylinder. A threaded rod is fixedly connected to the bottom of the inner wall of the pressure relief cylinder, and a sliding rod is fixedly connected to the top of the threaded rod, and evenly distributed pressure relief holes are provided on the top of the outer wall of the pressure relief cylinder.

[0010] By adopting the above technical solution, the stop valve can be pressure-relieved through the pressure relief hole.

[0011] As a further description of the above technical solution: a pressure relief plug is slidably connected to the top of the outer ring of the sliding rod, and a second nut is threadedly connected to the bottom of the outer wall of the threaded rod.

[0012] By adopting the above technical solution, the pressure relief degree of the pressure relief plug can be adjusted through the second nut.

[0013] As a further description of the above technical solution: the outer ring of the threaded rod and the sliding rod is provided with a spring, and the spring is in contact with the second nut and the pressure relief plug.

[0014] By adopting the above technical solution, the pressure value of the pressure relief is adjusted through the spring, and the safety of use is guaranteed by rapid pressure relief.

[0015] As a further description of the above technical solution: the top of the valve cover is penetrated and threadedly connected with evenly distributed first bolts, and the first bolts penetrate the rubber pad and the second flange and are threadedly connected.

[0016] By adopting the above technical solution, the rubber pad can be easily replaced through the first bolt.

[0017] As a further description of the above technical solution: second bolts are passed through and threadedly connected to both sides of the top of the filler block, and the second bolts pass through the fixing block and are threadedly connected.

[0018] By adopting the above technical solution, the fixing block and the first nut can be limited by the second bolt.

[0019] As a further description of the above technical solution: a locking nut is arranged at the top of the outer ring of the valve stem, a hand wheel is arranged at the bottom of the locking nut, and the hand wheel penetrates and is fixedly connected to the valve stem.

[0020] By adopting the above technical solution, the hand wheel can be disassembled by rotating the locking nut.

[0021] As a further description of the above technical solution: a mounting block is passed through and provided at the bottom of the valve stem, and a valve core is fixedly connected to the bottom of the mounting block.

[0022] By adopting the above technical solution, the inner wall leakage can be prevented through the valve core.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0024] 1. The utility model provides a self-decompression explosion-proof stop valve. First, the rubber pad between the second flange and the valve cover can prevent leakage between the valve body and the valve cover. The packing block and the pressure cover can prevent leakage of the valve cover. The internal seal can ensure that the valve will not leak when it is closed, and the external seal can prevent external media from entering the valve, ensuring the reliability and stability of the valve for long-term operation.

[0025] 2. The utility model provides a self-decompression explosion-proof stop valve. The second nut is rotated through the adjustment hole to make the second nut squeeze the spring, increase the elastic potential energy of the spring, and adjust the pressure of the pressure relief according to different fluids. When the pressure is too high, the fluid squeezes the pressure relief plug, thereby squeezing the spring, causing the pressure relief plug to move downward on the slide rod. When it moves to below the pressure relief hole, the fluid is decompressed through the pressure relief hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 It is a three-dimensional diagram of the utility model;

[0028] Figure 3 It is a schematic diagram of the pressure relief assembly of the utility model;

[0029] Figure 4 It is a cross-sectional view of the utility model;

[0030] Figure 5 It is a schematic diagram of the valve stem of the utility model.

[0031] Legend:

[0032] 1. Valve body; 2. First flange; 3. Fixed cylinder; 4. Second flange; 5. Rubber pad; 6. Valve cover; 7. First bolt; 8. Pressure relief cylinder; 9. Packing block; 10. Pressure cover; 11. Valve stem; 12. First nut; 13. Fixed block; 14. Second bolt; 15. Handwheel; 16. Lock nut; 17. Adjustment hole; 18. Pressure relief hole; 19. Spring; 20. Sliding rod; 21. Threaded rod; 22. Second nut; 23. Pressure relief plug; 24. Mounting block; 25. Valve core; 26. Valve plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0035] Combination Figure 1 The utility model is a self-decompression explosion-proof stop valve, comprising a valve body 1, a fixing cylinder 3 is passed through and fixedly connected to the top of the valve body 1, a second flange 4 is fixedly connected to the top of the fixing cylinder 3, a valve stem 11 is passed through and slidably connected to the top of the gland 10, a first nut 12 is passed through and threadedly connected to the top of the outer ring of the valve stem 11, a fixing block 13 is fixedly connected to both sides of the outer wall of the first nut 12, a pressure relief assembly is arranged at the bottom of the valve body 1, a first flange 2 is fixedly connected to the left and right sides of the valve body 1, a valve plate 26 is fixedly connected to both sides of the inner wall of the valve body 1, a second bolt 14 is passed through and threadedly connected to both sides of the top of the packing block 9, and the second bolt 14 passes through the fixing block 13 and is threadedly connected, a locking nut 16 is arranged at the top of the outer ring of the valve stem 11, a hand wheel 15 is arranged at the bottom of the locking nut 16, and the hand wheel 15 passes through and is fixedly connected to the valve stem 11;

[0036] The first flange 2 facilitates the connection between the valve body 1 and the pipeline, the locking nut 16 facilitates the disassembly of the hand wheel, the first bolt 7 facilitates the disassembly of the valve cover 6, and the second bolt 14, the fixing block 13 and the first nut 12 can limit the position of the valve stem 11.

[0037] Combination Figure 2 and Figure 3 A rubber pad 5 is provided on the top of the second flange 4, a valve cover 6 is provided on the top of the rubber pad 5, a stuffing block 9 is passed through and fixedly connected to the middle of the top of the valve cover 6, a gland 10 is passed through and provided to the middle of the top of the stuffing block 9, a mounting block 24 is passed through and provided to the bottom of the valve stem 11, and a valve core 25 is fixedly connected to the bottom of the mounting block 24;

[0038] The rubber gasket 5 between the second flange 4 and the valve cover 6 can prevent leakage between the valve body 1 and the valve cover 6, the packing block 9 and the pressure cover 10 can prevent leakage of the valve cover 6, the internal seal can ensure that the valve will not leak when it is closed, and the external seal can prevent external media from entering the interior of the valve, ensuring the reliability and stability of the valve during long-term operation.

[0039] Combination Figure 4The pressure relief assembly includes a pressure relief cylinder 8, which penetrates and is threadedly connected to the valve body 1. Adjustment holes 17 are provided on both the front and rear sides of the pressure relief cylinder 8. A threaded rod 21 is fixedly connected to the bottom of the inner wall of the pressure relief cylinder 8. A slide rod 20 is fixedly connected to the top of the threaded rod 21. Evenly distributed pressure relief holes 18 are provided on the top of the outer wall of the pressure relief cylinder 8. A pressure relief plug 23 is slidably connected to the top of the outer ring of the slide rod 20. A second nut 22 is threadedly connected to the bottom of the outer wall of the threaded rod 21. A spring 19 is sleeved on the outer rings of the threaded rod 21 and the slide rod 20, and the spring 19 is in contact with the second nut 22 and the pressure relief plug 23.

[0040] The second nut 22 is rotated through the adjustment hole 17, and the second nut 22 moves axially on the threaded rod 21, thereby squeezing the spring 19, thereby increasing the elastic potential energy of the spring 19, so as to adjust the pressure of the pressure relief according to different fluids. When the pressure is too large, the fluid squeezes the pressure relief plug 23, thereby squeezing the spring 19, so that the pressure relief plug 23 moves downward on the slide rod 20. When it moves to the bottom of the pressure relief hole 18, the fluid is depressurized through the pressure relief hole 18, and the pressure relief plug 23 will not leave the slide rod 20.

[0041] Working principle: the hand wheel 15 is fixed to the valve stem 11 with a locking nut 16. Turning the hand wheel 15 to rotate the valve stem 11 will drive the valve stem 11 to move axially, that is, up and down. The lower end of the valve stem 11 is connected to the valve core 25. When the stop valve is in a closed state, the valve core 25 is tightly connected to the valve plate 26 to ensure that the fluid in the stop valve will not leak. When the stop valve is in an open state, the hand wheel 15 is rotated counterclockwise to make the valve stem 11 rise, that is, the valve core 25 leaves the position of the valve plate 26. The rubber pad 5, the stuffing block 9 and the gland 10 can prevent external media from entering the interior of the valve. When the pressure is too high, the pressure in the valve body 1 is relieved through the pressure relief assembly.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-decompression explosion-proof stop valve, comprising a valve body (1), characterized in that: A fixing cylinder (3) is passed through and fixedly connected to the top of the valve body (1), a second flange (4) is fixedly connected to the top of the fixing cylinder (3), a rubber pad (5) is arranged on the top of the second flange (4), a valve cover (6) is arranged on the top of the rubber pad (5), a stuffing block (9) is passed through and fixedly connected to the middle of the top of the valve cover (6), a pressure cover (10) is passed through and fixedly connected to the middle of the top of the stuffing block (9), a valve stem (11) is passed through and slidably connected to the top of the pressure cover (10), a first nut (12) is passed through and threadedly connected to the top of the outer ring of the valve stem (11), and both sides of the outer wall of the first nut (12) are fixedly connected to fixing blocks (13), a pressure relief assembly is arranged at the bottom of the valve body (1), the left and right sides of the valve body (1) are fixedly connected to the first flange (2), and both sides of the inner wall of the valve body (1) are fixedly connected to the valve plate (26).

2. A self-decompression explosion-proof stop valve according to claim 1, characterized in that: The pressure relief assembly comprises a pressure relief cylinder (8), the pressure relief cylinder (8) penetrates the valve body (1) and is threadedly connected, the front and rear sides of the pressure relief cylinder (8) are provided with adjustment holes (17), the bottom of the inner wall of the pressure relief cylinder (8) is fixedly connected with a threaded rod (21), the top of the threaded rod (21) is fixedly connected with a sliding rod (20), and the top of the outer wall of the pressure relief cylinder (8) is provided with evenly distributed pressure relief holes (18).

3. A self-decompression explosion-proof stop valve according to claim 2, characterized in that: The top of the outer ring of the sliding rod (20) is slidably connected to a pressure relief plug (23), and the bottom of the outer wall of the threaded rod (21) is threadedly connected to a second nut (22).

4. A self-decompression explosion-proof stop valve according to claim 2, characterized in that: The outer sleeves of the threaded rod (21) and the sliding rod (20) are provided with a spring (19), and the spring (19) is in contact with the second nut (22) and the pressure relief plug (23).

5. The self-decompression explosion-proof stop valve according to claim 1, characterized in that: The top of the valve cover (6) is penetrated by first bolts (7) which are evenly distributed and threadedly connected, and the first bolts (7) penetrate the rubber pad (5) and the second flange (4) and are threadedly connected.

6. A self-decompression explosion-proof stop valve according to claim 1, characterized in that: Second bolts (14) penetrate through and are threadedly connected to both sides of the top of the filler block (9), and the second bolts (14) penetrate through the fixing block (13) and are threadedly connected.

7. The self-decompression explosion-proof stop valve according to claim 1, characterized in that: A locking nut (16) is arranged at the top of the outer ring of the valve stem (11), a hand wheel (15) is arranged at the bottom of the locking nut (16), and the hand wheel (15) penetrates and is fixedly connected to the valve stem (11).

8. The self-decompression explosion-proof stop valve according to claim 1, characterized in that: A mounting block (24) is passed through and provided at the bottom of the valve stem (11), and a valve core (25) is fixedly connected to the bottom of the mounting block (24).

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