Side-mounted low-temperature sealing butterfly valve

Abstract

The side-mounted low-temperature sealing butterfly valve comprises a valve body, a butterfly plate, a valve rod and a dynamic executing mechanism, the valve body comprises a medium axial flow channel, flange parts located at the two ends of the valve body and a valve cover located at the upper end of the valve body, and the side face of the valve body is further provided with an inspection hole communicated with the medium axial flow channel and a sealing cover for sealing the inspection hole through a bolt. A bottom cover is arranged at the lower end, opposite to the valve rod, of the valve body, the valve rod comprises an upper valve shaft connected with an executing mechanism and a lower valve shaft in circumferential linkage with the upper valve shaft through a coupler, and the valve rod penetrates through the butterfly plate and is provided with a flat key structure for circumferential linkage arrangement. According to the side-mounted ultralow-temperature butterfly valve, the inspection hole is formed in the side edge of the valve shaft of the valve body, so that the sealing ring and the valve seat are convenient to disassemble and assemble; due to the fact that the valve rod and the butterfly plate are connected through a pin-free flat key, after the bottom cover and the lower shaft sleeve are detached, the valve rod automatically slides out downwards, then the butterfly plate is separated from the valve shaft, the butterfly plate is taken out from the side face inspection hole, and online maintenance and replacement are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a side-mounted cryogenic sealing butterfly valve. Background Technology

[0002] Cryogenic valves are side-mounted cryogenic sealing butterfly valves that operate in cryogenic media. Cryogenic valves operate under harsh conditions, with their working media mostly being flammable, explosive, and highly permeable substances. The lowest operating temperature can reach -269℃. Therefore, their design requirements are higher than those of ordinary valves to prevent various adverse phenomena caused by cryogenic environments.

[0003] In the existing technology, cryogenic valves have a short service life. When the valve is used too many times or exposed to low temperatures for too long, the sealing ring will be permanently deformed and lose some elasticity, forming a gap between the valve body and the sealing ring, which will lead to valve leakage. Therefore, the sealing ring needs to be replaced regularly. However, replacing the sealing ring requires disassembling the butterfly valve, and common butterfly valves are cumbersome to disassemble and difficult to maintain. Utility Model Content

[0004] In view of the existing technology, the purpose of this utility model is to provide a side-mounted cryogenic sealing butterfly valve, a side-mounted triple eccentric hard seal cryogenic butterfly valve, which can meet the requirements of quick and convenient disassembly and maintenance of the butterfly valve structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a side-mounted cryogenic sealing butterfly valve, comprising a valve body, a butterfly plate, a valve stem, and a moving actuator. The valve body includes a medium shaft flow channel, flanges located at both ends of the valve body, and a valve cover at the upper end. The side of the valve body is also provided with an inspection hole connecting to the medium shaft flow channel and a sealing cover for bolting to close the inspection hole. The lower end of the valve body relative to the valve stem is provided with a bottom cover. The valve stem includes an upper valve shaft connected to the actuator and a lower valve shaft that is circumferentially linked to the upper valve shaft by a coupling. The valve stem passes through the butterfly plate and is provided with a flat key structure for circumferential linkage.

[0006] As a further provision of the above scheme, the valve body is also provided with a valve seat, which is fixed in the valve body by a screw and is used to cooperate with the butterfly plate to seal the medium axial flow channel. The end of the screw of the valve seat faces the side with the inspection hole.

[0007] As a further feature of the above solution, a bushing is provided between the valve stem and the valve body, and a limiting sleeve is also provided between the end of the bushing and the mounting part of the butterfly plate for keying with the lower valve shaft.

[0008] As a further feature of the above solution, the flat key structure includes a keyway on the lower valve shaft, an axial groove on the limiting sleeve, and a mounting key with a thickness greater than the keyway depth and less than the combined depth of the axial groove and the keyway.

[0009] As a further provision of the above scheme, the upper valve shaft and the lower valve shaft are provided with a plug-in portion at one end opposite to each other, and the coupling is provided with a snap-fit ​​portion at both ends that matches the plug-in portion. The coupling is circumferentially linked to the upper valve shaft and the lower valve shaft through the plug-in portion and the snap-fit ​​portion.

[0010] As a further feature of the above solution, the valve body has a countersunk step at the bottom of the opening sealed by the bottom cover, and the bushing has a corresponding limiting ring. The bushing is fixed to the opening by the bottom cover.

[0011] As a further feature of the above solution, the size of the inspection hole is larger than the size of the butterfly plate.

[0012] Beneficial effects: This utility model of a side-mounted cryogenic butterfly valve has an inspection hole on the side of the valve body and valve shaft. During maintenance, after the valve cover is removed, the inspection hole is located on one side of the butterfly plate. When disassembling and assembling the sealing ring and valve seat, it is only necessary to remove the side inspection hole cover, remove the three-part retaining ring, valve seat, pressure ring and sealing ring respectively, and replace them with new sealing rings and valve seats. Moreover, since the valve stem and butterfly plate are connected without pins or keys, after removing the bottom cover and lower bushing, the valve stem will automatically slide down, and then the butterfly plate will disengage from the valve shaft and be taken out through the side inspection hole. The operation is convenient and facilitates online maintenance and replacement. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the side-mounted butterfly valve structure of this utility model.

[0014] Figure 2 This is a schematic cross-sectional view of the butterfly valve in this embodiment.

[0015] Figure 3 This is a schematic cross-sectional view of the inspection hole on the side of the butterfly valve in this embodiment.

[0016] Figure 4 This is a schematic diagram of the horizontal cross-sectional structure of this embodiment.

[0017] Reference numerals: 1. Bottom cover; 2. Valve seat; 3. Valve body; 5. Valve stem; 7. Limit sleeve; 8. Butterfly plate; 9. Lower valve shaft; 10. Flat key structure; 11. Medium shaft flow channel; 12. Flange; 13. Inspection hole; 14. Coupling; 15. Upper valve shaft; 19. Sealing cover; 20. Shaft sleeve; 21. Actuator; 22. Screw; 31. Lower opening; 32. Countersunk step; 33. Limit ring; 91. Mounting part; 92. Insertion part; 93. Snap-fit ​​part; 97. Axial groove; 98. Keyway; 99. Mounting key. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0019] like Figure 1-4 The illustrated side-mounted cryogenic sealing butterfly valve includes a valve body 3, a butterfly plate 8, a valve stem 5, and a moving actuator 21. The valve body 3 includes a medium shaft flow channel 11, flange portions 12 at both ends of the valve body 3, and a valve cover 16 at the upper end. The side of the valve body 3 also has an inspection hole 13 connecting to the medium shaft flow channel 11 and a sealing cover 19 for bolting to close the inspection hole 13. A bottom cover 1 is provided at the lower end of the valve body 3 relative to the valve stem 5. The valve stem 5 includes an upper valve shaft 15 connected to the actuator 21 and... By setting a coupling 14 to circumferentially link the lower valve shaft 9 of the upper valve shaft 15, the valve stem 5 passes through the butterfly plate 8 and is provided with a flat key structure 10 for circumferential linkage. The valve stem 5 of this utility model has a split structure, and the lower valve shaft 9, which is circumferentially linked with the butterfly plate 8, is detachable. After conveniently removing the lower valve shaft 9, the butterfly plate 8 can be quickly removed, which makes it convenient for staff to easily remove, clean, maintain, and replace the valve seat 2, sealing components, butterfly plate 8, and lower valve shaft 9.

[0020] As a further provision of the above scheme, a valve seat 2 is also provided inside the valve body 3. The valve seat 2 is fixed inside the valve body 3 by a screw 22 and is used to cooperate with the butterfly plate 8 to seal the medium axial flow channel 11. The end of the screw 22 of the valve seat 2 faces the side with the inspection hole 13.

[0021] As a further provision of the above scheme, a bushing 20 is provided between the valve stem 5 and the valve body 3. A limiting sleeve 7 is also provided between the end of the bushing 20 and the mounting part 91 of the butterfly plate 8 for keying with the lower valve shaft 9. The key structure 10 includes a keyway 98 provided on the lower valve shaft 9, an axial groove 97 provided on the limiting sleeve 7, and a mounting key 99 with a thickness greater than the depth of the keyway 98 and less than the combined depth of the axial groove 97 and the keyway 98.

[0022] As a further provision of the above scheme, the upper valve shaft 15 and the lower valve shaft 9 are provided with a plug-in portion 92 at one end, and the coupling 14 is provided with a snap-fit ​​portion 93 at both ends that matches the plug-in portion 92. The coupling 14 is circumferentially linked to the upper valve shaft 15 and the lower valve shaft through the plug-in portion 92 and the snap-fit ​​portion 93.

[0023] As described above, in this embodiment, the valve stem 5 is divided into an upper valve shaft 15 and a lower valve shaft 9, which are linked circumferentially by a coupling 14. Due to the split valve stem 5 structure, disassembly only requires opening the side sealing cover 19, then disassembling the screw rod 22, and finally removing the three-part retaining ring, valve seat 2, pressure ring, and sealing ring. Figure 1 Since the valve stem 5 and the butterfly plate 8 are connected without pins, the valve stem 5 will automatically slide down after the bottom cover 1 and the bushing 20 located on the side of the lower disassembly port 31 are removed through the axially unrestricted flat key structure 10. Then the butterfly plate 8 will disengage from the lower valve shaft 9, and the butterfly plate 8 can be taken out from the side inspection hole 13 to complete the disassembly of the sealing structure. After maintenance, the components can be assembled by reversing the operation. Finally, the sealing cover 19 and the bottom cover 1 are bolted to seal the inspection hole 13 and the lower disassembly port 31.

[0024] As a further feature of the above scheme, the valve body 3 has a countersunk step 32 in the lower opening 31 that is closed by the bottom cover 1, and the bushing 20 has a corresponding limiting ring 33. The bushing 20 is fixed at the lower opening 31 by the bottom cover 1.

[0025] As described above, in this embodiment, the bushing 20 replaces the friction between the valve stem 5 and the valve body 3 and is used to position the butterfly plate 8.

[0026] As a further feature of the above scheme, the size of the inspection hole 13 is larger than the size of the butterfly plate 8.

[0027] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A side-mounted cryogenic sealing butterfly valve, comprising a valve body (3), a butterfly plate (8), a valve stem (5), and a moving actuator (21), characterized in that: The valve body (3) includes a medium shaft flow channel (11), flanges (12) at both ends of the valve body (3), and a valve cover (16) at the upper end. The valve body (3) also has an inspection hole (13) connecting the medium shaft flow channel (11) and a sealing cover (19) for bolt sealing the inspection hole (13) on the side. The valve body (3) has a bottom cover (1) at the lower end relative to the valve stem (5). The valve stem (5) includes an upper valve shaft (15) connected to the actuator (21) and a lower valve shaft (9) that circumferentially links the upper valve shaft (15) through a coupling (14). The valve stem (5) passes through the butterfly plate (8) and is provided with a flat key structure (10) for circumferential linkage.

2. The side-mounted cryogenic sealing butterfly valve according to claim 1, characterized in that: The valve body (3) is also provided with a valve seat (2), which is fixed in the valve body (3) by a screw (22) for cooperating with the butterfly plate (8) to seal the medium axial flow channel (11). The end of the screw (22) of the valve seat (2) faces the side with the inspection hole (13).

3. A side-mounted cryogenic sealing butterfly valve according to claim 1, characterized in that: A bushing (20) is provided between the valve stem (5) and the valve body (3), and a limiting sleeve (7) is also provided between the end of the bushing (20) and the mounting part (91) of the butterfly plate (8) for keying with the lower valve shaft (9).

4. A side-mounted cryogenic sealing butterfly valve according to claim 3, characterized in that: The flat key structure (10) includes a keyway (98) provided on the lower valve shaft (9), an axial groove (97) provided on the limiting sleeve (7), and a mounting key (99) with a thickness greater than the depth of the keyway (98) and less than the combined depth of the axial groove (97) and the keyway (98).

5. A side-mounted cryogenic sealing butterfly valve according to claim 3, characterized in that: The valve body (3) has a countersunk step (32) at the bottom of the lower opening (31) which is closed by the bottom cover (1). The bushing (20) has a corresponding limiting ring (33). The bushing (20) is fixed at the lower opening (31) by the bottom cover (1).

6. A side-mounted cryogenic sealing butterfly valve according to claim 1, characterized in that: The upper valve shaft (15) and the lower valve shaft (9) are provided with a plug-in part (92) at one end opposite to each other. The coupling (14) is provided with a snap-fit ​​part (93) at both ends that matches the plug-in part (92). The coupling (14) circumferentially links the upper valve shaft (15) and the lower valve shaft through the plug-in part (92) and the snap-fit ​​part (93).

7. A side-mounted cryogenic sealing butterfly valve according to claim 1, characterized in that: The size of the inspection hole (13) is larger than the size of the butterfly plate (8).

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