Cold box stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a cold box stop valve, which has the same price as a common low-temperature stop valve through structural design, but can realize floating installation. The device has the characteristics of economy, reliability and the like, has good practical value, and can generate good economic benefits after being popularized and applied; the valve body is of an angle type structure, an inlet is formed in the bottom of the valve body, an outlet is formed in the left side of the valve body, a mounting boss is arranged on the right side of the valve body and used for being connected with an internal structure of the cold box, a valve clack is arranged in the valve body, a first split ring and a gland are arranged in the valve clack, and the gland is prevented from loosening through an anti-rotation gasket; a lower valve cover is arranged on the upper portion of the valve body, a valve rod nut is arranged on the upper portion of the support, a driving rod is arranged in the valve rod nut and connected with the valve rod through a butt clamping block, the butt clamping block is fastened through a first screw, and a hand wheel is fixed to the top of the driving rod through a second nut.

Description

Technical Field

[0001] This utility model relates to the technical field of shut-off valves, and in particular to shut-off valves for cold boxes. Background Technology

[0002] Gate valves are widely used valves with various structural forms to adapt to different working conditions. They can be used to control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. Gate valves have a relatively short valve stem opening stroke, and the opening height is generally only one-quarter of the valve seat channel diameter. The friction between the sealing surfaces of gate valves is small, resulting in a very reliable shut-off function. Typically, gate valves have only one sealing surface, making them easy to manufacture and maintain. Therefore, gate valves are widely used in industrial systems.

[0003] However, ordinary cryogenic shut-off valves have a drawback: they require high positional accuracy from the cold box during installation. On-site installation is often limited by practical conditions, and the positional accuracy of the cold box opening usually has a significant deviation. To install an ordinary cryogenic shut-off valve, the cold box needs repeated adjustments and grinding, which is time-consuming and labor-intensive, and may also create unnecessary stress on the valve neck. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a cold box shut-off valve.

[0005] This utility model discloses a shut-off valve for a cold box, comprising a valve body, a valve disc, a first split ring, an anti-rotation gasket, a gland, a middle flange gasket, a lower valve cover, an extension sleeve, a valve stem, an upper valve cover, a mounting plate, a lifting screw, a lifting plate, a second split ring, packing, a bracket, a pressure sleeve, a pressure plate, a clamping block, a first screw, a drive rod, a valve stem nut, a handwheel, and a second nut. The valve body has an angle structure, with the bottom as the inlet and the left side as the outlet. The right side of the valve body has a mounting boss for connecting to the internal structure of the cold box. The valve body contains a valve disc, which in turn contains a first split ring and a gland. The gland is secured by an anti-rotation gasket. The first split ring holds the head of the valve stem. A lower valve is located at the top of the valve body. A middle flange gasket is installed between the lower valve cover and the valve body. An extension sleeve is installed above the lower valve cover, and an upper valve cover is installed above the extension sleeve. The upper valve cover is secured to the lifting plate by a second split ring. The lifting plate is fastened to the mounting plate by lifting screws. The upper valve cover has packing, a pressure sleeve, and a pressure plate arranged sequentially. The packing, pressure sleeve, and pressure plate form a dynamic seal for the valve stem. A valve stem nut is installed at the top of the bracket. A drive rod is located inside the valve stem nut. The drive rod is connected to the valve stem via a clamping block, which is secured by a first screw. The handwheel is fixed to the top of the drive rod by a second nut. Through its structural design, the cold box shut-off valve achieves the same price as a regular cryogenic shut-off valve while allowing for floating installation. This utility model is economical and reliable, has good practical value, and its widespread application will generate significant economic benefits.

[0006] Preferably, the valve body is installed inside the cold box using No. 2 screws, and the mounting plate is fixed to the side wall of the cold box using bolts. The mounting sleeve is inserted from the bottom of the mounting plate and is secured to the lifting plate by a No. 2 split ring. The mounting sleeve and the cold box form a seal. There is an increased radial space between the mounting sleeve and the mounting plate, and there is an axial contact area between the mounting sleeve and the mounting plate. The mounting sleeve and the upper valve cover can move freely axially, and there is a longer mating length between the upper valve cover and the mounting sleeve. The increased radial space between the mounting sleeve and the mounting plate can compensate for the dimensional deviation of the cold box. At the same time, the large axial contact area between the mounting sleeve and the mounting plate can ensure that the floating seal is not lost. The mounting sleeve and the upper valve cover can move freely axially, and there is a longer mating length to ensure that the axial floating seal will not slip and that the axial seal will not be lost.

[0007] Preferably, the mounting plate is bolted to the side wall of the cold box.

[0008] Preferably, the mounting boss on the valve body is fixedly mounted on the cold box by a No. 2 screw.

[0009] Preferably, the valve body is mounted on the side and controlled by an operating handwheel.

[0010] Preferably, the lower valve cover and the valve body are fastened with studs and a No. 1 nut.

[0011] Compared with existing technologies, the advantages of this utility model are as follows: the cold box shut-off valve, through structural design, ensures that its price is the same as that of ordinary low-temperature shut-off valves, but it can achieve floating installation. This utility model has the characteristics of being economical and reliable, has good practical value, and can generate good economic benefits after its widespread application. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the cold box shut-off valve;

[0013] Figure 2 This is a schematic diagram of the cold box shut-off valve installation;

[0014] Figure 3 This is an isometric drawing of the cold box shut-off valve installation.

[0015] The following are labels in the attached diagram: 1. Valve body; 2. Valve disc; 3. First split ring; 4. Anti-rotation gasket; 5. Gland; 6. Middle flange gasket; 7. Lower valve cover; 8. Nut No. 1; 9. Stud; 10. Extension sleeve; 11. Valve stem; 12. Upper valve cover; 13. Mounting sleeve; 14. Mounting plate; 15. Lifting screw; 16. Lifting plate; 17. Second split ring; 18. Packing; 19. Bracket; 20. Pressure sleeve; 21. Pressure plate; 22. Clamping block; 23. Screw No. 1; 24. Drive rod; 25. Valve stem nut; 26. Handwheel; 27. Nut No. 2; 28. Bolt; 29. ​​Cold box; 30. Screw No. 2. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example

[0017] like Figures 1 to 3As shown, the cold box shut-off valve of this utility model includes a valve body 1, a valve disc 2, a first split ring 3, an anti-rotation gasket 4, a gland 5, a middle flange gasket 6, a lower valve cover 7, an extension sleeve 10, a valve stem 11, an upper valve cover 12, a mounting plate 14, a lifting screw 15, a lifting plate 16, a second split ring 17, packing 18, a bracket 19, a pressure sleeve 20, a pressure plate 21, a clamping block 22, a first screw 23, a drive rod 24, a valve stem nut 25, a handwheel 26, and a second nut 27. The valve body 1 has an angle structure, with the bottom as the inlet and the left side as the outlet. The right side of the valve body 1 has a mounting boss for connecting to the internal structure of the cold box 29. The valve disc 2 is located inside the valve body 1, and the first split ring 3 and the gland 5 are located inside the valve disc 2. The gland 5 is prevented from loosening by the anti-rotation gasket 4. The first split ring 3 locks the valve stem 11. The valve body 1 has a lower valve cover 7 on its upper part. A middle flange gasket 6 is provided between the lower valve cover 7 and the valve body 1. An extension sleeve 10 is provided on the upper part of the lower valve cover 7. An upper valve cover 12 is provided on the upper part of the extension sleeve 10. The upper valve cover 12 is clamped on the lifting plate 16 by a second split ring 17. The lifting plate 16 is fastened by a lifting screw 15 against the mounting plate 14. The upper part of the upper valve cover 12 is provided with a packing 18, a pressure sleeve 20, and a pressure plate 21 in sequence. The packing 18, the pressure sleeve 20, and the pressure plate 21 form a dynamic seal for the valve stem 11. A valve stem nut 25 is provided on the upper part of the bracket 19. A drive rod 24 is provided inside the valve stem nut 25. The drive rod 24 is connected to the valve stem 11 by a clamping block 22. The clamping block 22 is fastened by a screw 23. A handwheel 26 is fixed to the top of the drive rod 24 by a nut 27 and is used to open and close the valve.

[0018] The valve body 1 is installed inside the cold box 29 by screw No. 2 30. The mounting plate 14 is fixed to the side wall of the cold box 29 by bolt 28. The mounting sleeve 13 is inserted from the bottom of the mounting plate 14 and is locked with the lifting plate 16 by the second split ring 17. The mounting sleeve 13 and the cold box 29 form a seal. There is an increased radial space between the mounting sleeve 13 and the mounting plate 14. There is an axial contact area between the mounting sleeve 13 and the mounting plate 14. The mounting sleeve 13 and the upper valve cover 12 can move freely axially. At the same time, there is a long mating length between the upper valve cover 12 and the mounting sleeve 13.

[0019] The mounting plate 14 is mounted on the side wall of the cold box 29 by bolts 28;

[0020] Valve body 1 is mounted on the side and controlled by an operating handwheel;

[0021] The lower valve cover 7 and the valve body 1 are fastened by studs 9 and nuts 8.

[0022] In this embodiment, the valve body 1 is installed inside the cold box 29 by screw No. 2 30, and the mounting plate 14 is fixed to the side wall of the cold box 29 by bolts 28. The mounting sleeve 13 is inserted from the bottom of the mounting plate 14 and is locked with the lifting plate 16 by the second split ring 17. The mounting sleeve 13 and the cold box 29 form a seal. There is an increased radial space between the mounting sleeve 13 and the mounting plate 14, which can compensate for the size deviation of the cold box. At the same time, the mounting sleeve 13 and the mounting plate 14 have a large axial contact area, which can ensure that the floating seal is not lost. The mounting sleeve 13 and the upper valve cover 12 can move freely axially and have a long mating length to ensure that the axial floating seal will not slip and that the axial seal will not be lost. The valve body 1 is installed laterally and is controlled by an operating handwheel.

[0023] The main function achieved by this utility model is: a cold box shut-off valve that can compensate for installation deviations by improving the valve cover structure, which has the characteristics of simple structure, convenient disassembly and installation, and low heat loss.

[0024] The mounting sleeve 13 of the cold box shut-off valve of this utility model is purchased from the market. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A cold box shut-off valve, comprising a valve body (1), a valve disc (2), a first split ring (3), an anti-rotation gasket (4), a gland (5), a middle flange gasket (6), a lower valve cover (7), an extension sleeve (10), a valve stem (11), an upper valve cover (12), a mounting plate (14), a lifting screw (15), a lifting plate (16), a second split ring (17), packing (18), a bracket (19), a pressure sleeve (20), a pressure plate (21), a clamping block (22), a first screw (23), a drive rod (24), a valve stem nut (25), a handwheel (26), a second nut (27), and a cold box (29), characterized in that, The valve body (1) has an angle structure with the bottom as the inlet and the left side as the outlet. The right side of the valve body (1) has a mounting boss for connecting with the internal structure of the cold box (29). The valve body (1) has a valve disc (2) inside. The valve disc (2) has a first split ring (3) and a gland (5) inside. The gland (5) is prevented from loosening by an anti-rotation gasket (4). The first split ring (3) holds the head of the valve stem (11). The upper part of the valve body (1) has a lower valve cover (7). A middle flange gasket (6) is provided between the lower valve cover (7) and the valve body (1). The upper part of the lower valve cover (7) has an extension sleeve (10). The upper part of the extension sleeve (10) has an upper valve cover (12). The upper valve cover (12) is connected by two... The first open ring (17) is clamped on the clamping plate (16). The clamping plate (16) is fastened to the mounting plate (14) by the clamping screw (15). The upper part of the upper valve cover (12) is provided with packing (18), pressure sleeve (20) and pressure plate (21) in sequence. The packing (18), pressure sleeve (20) and pressure plate (21) form a dynamic seal of valve stem (11). The upper part of the bracket (19) is provided with valve stem nut (25). The valve stem nut (25) is provided with a drive rod (24) inside. The drive rod (24) is connected to the valve stem (11) through the clamping block (22). The clamping block (22) is fastened by the first screw (23). The handwheel (26) is fixed to the top of the drive rod (24) by the second nut (27).

2. The cold box shut-off valve as described in claim 1, characterized in that, The valve body (1) is installed inside the cold box (29) by screw No. 2 (30). The mounting plate (14) is fixed to the side wall of the cold box (29) by bolts (28). The mounting sleeve (13) is inserted from the bottom of the mounting plate (14) and the clamping plate (16) is locked by the second split ring (17). The mounting sleeve (13) and the cold box (29) form a seal. There is an increased radial space between the mounting sleeve (13) and the mounting plate (14). There is an axial contact area between the mounting sleeve (13) and the mounting plate (14). The mounting sleeve (13) and the upper valve cover (12) can move freely axially. At the same time, there is a longer mating length between the upper valve cover (12) and the mounting sleeve (13).

3. The cold box shut-off valve as described in claim 1, characterized in that, The mounting plate (14) is mounted on the side wall of the cold box (29) by bolts (28).

4. The cold box shut-off valve as described in claim 1, characterized in that, The mounting boss on the valve body (1) is fixedly mounted on the cold box (29) by screw No. 2 (30).

5. The cold box shut-off valve as described in claim 1, characterized in that, The valve body (1) is mounted on the side and controlled by an operating handwheel.

6. The cold box shut-off valve as described in claim 1, characterized in that, The lower valve cover (7) and the valve body (1) are fastened by studs (9) and nut (8).

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