Butterfly valve for use in ultra-low temperature environment

Abstract

The present invention relates to the technical field of valves, and disclosed is a butterfly valve for use in ultra-low temperature environment. The butterfly valve comprises a valve body (1), a butterfly disc (2) in the valve body (1), a valve seat (3) matching with the butterfly disc (2), a valve stem (4) fixed to the butterfly disc (2), and an operating assembly (5) for driving the valve stem (4) to rotate, wherein a manhole (11) and an observation cover (12) covering the manhole (11) are provided on the valve body (1), and the observation cover (12) is detachably connected to an outer edge of the manhole (11) on the valve body (1); a cleaning assembly (6) is provided on an outer side face of the valve body (1), and the cleaning assembly (6) comprises a cleaning member (61) located above the observation cover (12) and a driving member (62) for driving the cleaning member (61) to slide back and forth on an upper side face of the observation cover (12); and an operating wheel (51) rotates to drive the driving member (62) to operate, and one side of the cleaning member (61) abuts against the upper side face of the observation cover (12), which reduces the difficulty of maintenance of the butterfly valve and improves the efficiency of maintenance of the butterfly valve. In addition, the rotation of the operating wheel (51) can drive the driving member (62) to operate, which in turn drives the cleaning member (61) to clean an outer surface of the observation cover.

Description

A butterfly valve for ultra-low temperature environment Technical Field

[0001] The present application relates to a valve, and in particular to a butterfly valve for use in ultra-low temperature environments. Background Art

[0002] Cryogenic butterfly valve is a valve used in low temperature working conditions. It is usually used in the petroleum, chemical, papermaking, power station, glass and other industries. It is mainly used to regulate flow and cut off fluid.

[0003] In related technologies, when butterfly valves are used to cut off LNG (liquid natural gas) media in ultra-low temperature environments, in order to reduce leakage points between pipelines and equipment under ultra-low temperature conditions and avoid safety accidents, the connection between the butterfly valve and the pipeline is generally optimized from the original flange bolt connection to a welded connection.

[0004] When a butterfly valve is welded to a pipeline, if it leaks and fails to meet operating requirements, it must be repaired or replaced. However, butterfly valves generally use an integral structure, making it impossible to perform online repairs or replace parts. Consequently, if the seal fails, the entire valve must be replaced, which is costly and cumbersome. This results in low maintenance efficiency for butterfly valves, leaving room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a butterfly valve for use in ultra-low temperature environments to solve the problems in the above-mentioned related technologies, namely, when repairing butterfly valves used in ultra-low temperature environments, the cost is high and the repair efficiency is low.

[0006] The butterfly valve provided in this application for use in ultra-low temperature environments adopts the following technical solutions.

[0007] A butterfly valve for use in ultra-low temperature environments, comprising a valve body, a butterfly plate located inside the valve body, a valve seat cooperating with the butterfly plate, a valve stem fixed to the butterfly plate, and an operating assembly for driving the valve stem to rotate; the valve body is provided with a manhole and an observation cover plate covering the manhole, and the observation cover plate is detachably connected to the outer edge of the manhole.

[0008] By adopting the above technical solution, when the butterfly valve needs to be repaired, the interior of the valve body can be observed through the observation cover. When internal parts need to be replaced, the butterfly valve can be adjusted to the closed position first, and then the observation cover can be opened to inspect the connection between the valve seat and the butterfly plate. This configuration reduces the difficulty of butterfly valve repair and improves the efficiency of butterfly valve repair.

[0009] Optionally, a positioning ring groove for the valve seat to be placed in is provided on the inner wall of the valve body, and a fixing member for limiting the valve seat is provided inside the valve body.

[0010] By adopting the above technical solution, the valve seat is arranged in a floating manner through the coordination of the positioning ring groove and the fixing member. When the butterfly valve is in the closed state, the valve seat can slide back and forth within the positioning ring groove for a short distance under the impact of the liquid medium. During this process, the inner side of the valve seat is pressed against the outer periphery of the butterfly plate, thereby improving the sealing performance of the butterfly valve in the closed state.

[0011] Optionally, the fixing member includes a plurality of arc-shaped plates located on a side of the valve seat away from the positioning ring groove and locking bolts for fixing the arc-shaped plates.

[0012] By adopting the above technical solution, the valve seat is limited and fixed by the arc plate, and the split setting of the fixing part facilitates the installation and fixation of the arc plate.

[0013] Optionally, the operating assembly includes a transmission member linked to the valve stem and an operating wheel for driving the rotating member to operate, the operating wheel includes a handwheel and a drive rod fixed to one side of the handwheel, and the drive rod is used to drive the transmission member to operate.

[0014] By adopting the above technical solution, during the control of the valve stem, the rotation of the handwheel drives the drive rod to rotate coaxially through the cooperation of the transmission member and the operating wheel, thereby driving the transmission member to operate, and finally driving the valve stem linked to the transmission member to rotate, thereby realizing the rotation of the valve stem and the butterfly plate relative to the valve seat.

[0015] Optionally, a cleaning assembly is provided on the outer side of the valve body, and the cleaning assembly includes a cleaning member located above the observation cover and a driving member for driving the cleaning member to slide back and forth on the upper side of the observation cover. When the operating wheel rotates, the driving member is driven to operate, and one side of the cleaning member abuts against the upper side of the observation cover.

[0016] By adopting the above technical solution, when the valve body needs to be inspected or parts need to be replaced, the butterfly valve is first adjusted from the open state to the closed state by controlling the operating wheel. During this process, the rotation of the operating wheel drives the driving member to operate, and then drives the cleaning member to clean the outer surface of the observation cover. This allows the interior of the valve body to be observed before removing the observation cover, without the need for additional cleaning tools to clean the outer surface of the observation cover, thereby improving the efficiency of internal valve body inspection or part replacement.

[0017] Optionally, the cleaning member includes a connecting plate, a fixing plate and a cleaning block arranged on one side of the fixing plate, the side of the fixing plate away from the cleaning block is detachably connected to the connecting plate, and the driving member is configured to drive the connecting plate to slide.

[0018] By adopting the above technical solution, when the cleaning member is cleaning the outer surface of the observation cover, the operating wheel drives the driving member to operate, and the driving member drives the connecting plate and the cleaning block to slide synchronously, thereby cleaning the outer surface of the observation cover. At the same time, when the cleaning block is damaged, it is also convenient to replace the cleaning block.

[0019] Optionally, a fixing groove for inserting the fixing plate is provided on the connecting plate, an elastic clip is provided on the side of the fixing plate, and a positioning groove for inserting the elastic clip is provided on the side wall of the fixing groove on the connecting plate.

[0020] By adopting the above technical solution, when the cleaning block is replaced, the fixing plate fixed to the new cleaning block is inserted into the inside of the fixing groove, and then the elastic clip on the fixing plate is inserted into the corresponding positioning groove, which not only facilitates the assembly and fixation of the fixing plate and the connecting plate, but also improves the installation stability of the fixing plate inside the fixing groove.

[0021] Optionally, the driving member includes a vertically arranged rotating rod and a horizontally arranged adjusting rod, a first gear and a second gear are respectively provided at both ends of the rotating rod, and a third gear meshing with the first gear is provided on the outer periphery of the driving rod; a first rack is provided on the side of the adjusting rod facing the second gear, and the length direction of the first rack is parallel to the length direction of the adjusting rod, one end of the adjusting rod is fixedly connected to the connecting plate, and the connecting plate can slide along the length direction of the adjusting rod.

[0022] By adopting the above technical solution, the rotation of the handwheel drives the rotation rod around its own axis, which in turn drives the first rack to slide along the length direction of the adjusting rod, and then drives the cleaning member to slide along the length direction of the adjusting rod, ultimately achieving the cleaning of the outer side of the observation cover. When the butterfly valve is in the closed state, the cleaning member is located on the side of the observation cover close to the drive member. In this closed state, the observation cover can be removed and the interior of the valve body can be inspected. When the butterfly valve is in the open state, the cleaning member is located on the side of the observation cover away from the drive member. At this time, the upper side of the observation cover is limited by the adjusting rod to remind the staff that the observation cover should not be opened in this state.

[0023] Optionally, the rotating rod is a telescopic rod with adjustable and lockable length.

[0024] By adopting the above technical solution, since the rotating rod is a telescopic rod with adjustable and lockable length, when there is no need to clean the outer side of the observation cover, the overall length of the rotating rod can be shortened and the engagement between the first rack and the second gear can be released, so that the cleaning member cannot clean the outer side of the observation cover; thereby, the application range of the cleaning component is improved.

[0025] Optionally, a protection assembly for protecting the driving member is provided on the outside of the valve body, and the protection assembly includes a box body and a box door installed on the box body.

[0026] By adopting the above technical solution, the meshing points between the first gear and the third gear, and the second gear and the first rack are protected through the cooperation between the box door and the box body, thereby reducing the impact of external impurities on the meshing points between the first gear and the third gear, and the second gear and the first rack.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Due to the coordinated arrangement of the manhole and the observation cover, when the butterfly valve needs to be inspected, the interior of the valve body can be observed through the observation cover. When internal parts need to be replaced, the butterfly valve can be adjusted to a closed state first, and then the observation cover can be opened to inspect the connection between the valve seat and the butterfly plate; this reduces the difficulty of inspecting the butterfly valve and improves the efficiency of inspecting the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic diagram of the overall structure of Example 1 of the present application;

[0031] FIG2 is a partial cross-sectional view of the installation and cooperation between the butterfly plate and the valve seat in Example 1 of the present application;

[0032] FIG3 is a schematic diagram of a partial structure of the installation and coordination of the operating components according to Example 1 of the present application;

[0033] FIG4 is an exploded view of the distribution of the fixing member and the valve seat according to Example 1 of the present application;

[0034] FIG5 is a cross-sectional view showing the installation and cooperation of the butterfly plate and the first sealing ring in Example 1 of the present application;

[0035] FIG6 is an enlarged schematic diagram of portion A in FIG5 ;

[0036] FIG7 is a partial cross-sectional view of the installation and cooperation between the valve seat and the fixing member in Example 1 of the present application;

[0037] FIG8 is a structural diagram of the cleaning member when the butterfly valve is in an open state according to Embodiment 2 of the present application;

[0038] FIG9 is a partial structural diagram of the cleaning member when the butterfly valve is in a closed state according to Example 2 of the present application;

[0039] FIG10 is a partial cross-sectional view of the installation and coordination of the cleaning member according to Example 2 of the present application;

[0040] FIG11 is an enlarged schematic diagram of portion B in FIG10 ;

[0041] FIG12 is a partial cross-sectional view of the installation and cooperation of the driving member according to the second embodiment of the present application;

[0042] FIG13 is an enlarged schematic diagram of portion C in FIG12;

[0043] FIG14 is a schematic diagram of the partial structure of the installation and coordination of the protective component according to Example 2 of the present application.

[0044] In the figure, 1, valve body; 11, manhole; 12, observation cover; 13, annular pressure plate; 14, first sealing ring; 141, first positioning hole; 15, positioning ring groove; 16, fixing piece; 161, arc plate; 162, locking bolt; 17, positioning pin; 18, guide frame; 19, third ring groove; 2, butterfly plate; 21, first ring groove; 22, second ring groove; 23, second positioning hole; 3, valve seat; 4, valve stem; 5, operating assembly; 51, operating wheel; 511, hand wheel; 512, drive rod; 5121, third Three gears; 52. Transmission part; 6. Cleaning assembly; 61. Cleaning part; 611. Connecting plate; 6111. Fixing groove; 6112. Positioning groove; 612. Fixing plate; 6121. Placement groove; 613. Cleaning block; 62. Driving part; 621. Rotating rod; 622. Adjusting rod; 623. First gear; 624. Second gear; 625. First rack; 63. Elastic clip; 631. Compression spring; 632. Arc-shaped protrusion; 7. Protective assembly; 71. Box body; 72. Box door; 73. Limit block. DETAILED DESCRIPTION

[0045] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0046] Example 1:

[0047] Referring to Figures 1 and 2, a butterfly valve for use in ultra-low temperature environments includes a valve body 1, a butterfly plate 2 located within the valve body 1, a valve seat 3 mating with the butterfly plate 2, a valve stem 4 fixed to the butterfly plate 2, and an operating assembly 5 for rotating the valve stem 4. The valve stem 4 is bolted to one side of the butterfly plate 2. The valve body 1 is provided with a manhole 11 and an observation cover 12 covering the manhole 11. The observation cover 12 is made of a transparent material and is bolted to the outer edge of the manhole 11 on the valve body 1, thereby achieving a detachable connection of the observation cover 12.

[0048] During the operation of the butterfly valve, the operating assembly 5 drives the valve stem 4 to rotate relative to the valve seat 3, thereby controlling the rotation of the butterfly plate 2 relative to the valve seat 3, thereby controlling the opening and closing of the butterfly valve. When the butterfly valve needs to be repaired, the butterfly valve is first adjusted to the closed position, and then the inspection cover 12 is opened to inspect the connection between the valve seat 3 and the butterfly plate 2.

[0049] 2 and 3 , the operating assembly 5 includes a transmission member 52 that is linked to the valve stem 4 and an operating wheel 51 for driving the rotating member. The operating wheel 51 includes a handwheel 511 and a drive rod 512 fixed to one side of the handwheel 511. The transmission member 52 is a worm gear structure. The drive rod 512 is coaxially fixedly connected to the worm structure. The worm gear structure is coaxially fixedly connected to the outer end of the valve stem 4, and the worm gear structure and the worm structure are meshed. The handwheel 511 drives the drive rod 512 and the worm structure to rotate coaxially, thereby driving the worm gear structure and the valve stem 4 to rotate synchronously, thereby driving the butterfly plate 2 located inside the valve body 1 to rotate. This is a conventional drive structure and will not be described in detail here.

[0050] 4, 5 and 6, the outer circumferential surface of the butterfly plate 2 is provided with a first sealing ring 14 and an annular pressure plate 13 for fixing the first sealing ring 14. At the same time, a first annular groove 21 for inserting the first sealing ring 14 and a second annular groove 22 for inserting the annular pressure plate 13 are provided on one side of the butterfly plate 2, and the annular pressure plate 13 is fixed to the inside of the second annular groove 22 by bolts.

[0051] 5 and 6 , two first positioning holes 141 are provided on the first sealing ring 14, and a second positioning hole 23 coaxial with the first positioning hole 141 is provided on the butterfly plate 2, and a positioning pin 17 is provided on the side of the butterfly plate 2, which passes through both the first positioning hole 141 and the second positioning hole 23, thereby ensuring the coaxiality of the first sealing ring 14 after the second replacement.

[0052] Referring to Figure 7 , a positioning ring groove 15 for the valve seat 3 is provided on the inner wall of the valve body 1, and a fixing member 16 for limiting the position of the valve seat 3 is provided inside the valve body 1. After the butterfly plate 2, valve seat 3, and valve stem 4 are installed, the centers of the valve stem 4 (see Figure 1), valve seat 3 (see Figure 2), and butterfly plate 2 (see Figure 2) do not coincide, forming three eccentricities. This design allows the butterfly plate 2 (see Figure 2) to rotate smoothly during the opening and closing of the valve, while ensuring effective contact between the first sealing ring 14 and the valve seat 3, thereby achieving good sealing performance.

[0053] 4 and 7 , the fixing member 16 includes a locking bolt 162 and four curved plates 161 located on the side of the valve seat 3 away from the positioning ring groove 15. A third ring groove 19 is provided on the inner wall of the valve body 1 for the curved plates 161 to be inserted into. After the four curved plates 161 are inserted into the third ring groove 19, they are fixed to one side of the valve seat 3 by the locking bolts 162. The locking bolts 162 pass through the curved plates 161 and abut against one side of the valve seat 3. After the four curved plates 161 are installed, they form a four-ring structure, which not only limits the position of the valve seat 3, but also fixes the curved plates 161 themselves. When the butterfly valve is in the closed state, the outer peripheral surface of the first sealing ring 14 is always in close contact with the inner side surface of the valve seat 3, thereby ensuring the sealing performance of the butterfly valve in the closed state.

[0054] The implementation principle of this embodiment is:

[0055] During the operation of the butterfly valve, the operating assembly 5 drives the valve stem 4 to rotate relative to the valve seat 3, thereby controlling the rotation of the butterfly plate 2 relative to the valve seat 3, thereby controlling the opening and closing of the butterfly valve. When the butterfly valve needs to be repaired, the butterfly valve is first adjusted to the closed position, and then the inspection cover 12 is opened to inspect the connection between the valve seat 3 and the butterfly plate 2.

[0056] Example 2:

[0057] 8 and 9 , the difference between the embodiment of the present application and embodiment 1 is that a cleaning assembly 6 for cleaning the outer side of the observation cover 12 is provided on the outer side of the valve body 1, wherein the cleaning assembly 6 includes a cleaning member 61 located above the observation cover 12 and a driving member 62 for driving the cleaning member 61 to slide on the upper side of the observation cover 12, and one side of the cleaning member 61 abuts against the upper side of the observation cover 12.

[0058] Referring to Figure 10 , the cleaning member 61 includes a connecting plate 611, a fixing plate 612, and a cleaning block 613 fixedly mounted on one side of the fixing plate 612. The side of the fixing plate 612 facing away from the cleaning block 613 is fixedly connected to one side of the connecting plate 611, and the driving member 62 is capable of slidingly driving the connecting plate 611. The cleaning block 613 is made of sponge or rubber, and the connecting plate 611 is provided with a fixing slot 6111 for the fixing plate 612 to be inserted into, thereby achieving the assembly and fixation of the cleaning member 61.

[0059] 10 and 11 , a resilient clip 63 is provided on the side of the fixing plate 612. The resilient clip 63 includes a compression spring 631 and an arc-shaped protrusion 632. A placement groove 6121 is provided on the fixing plate 612 for receiving the compression spring 631 and the arc-shaped protrusion 632. The compression spring 631 squeezes the arc-shaped protrusion 632, causing a portion of the arc-shaped protrusion 632 to protrude from the placement groove 6121. The protruding portion of the arc-shaped protrusion 632 is an arc surface, and the arc length corresponding to the arc surface is a minor arc. A positioning groove 6112 is provided on the side wall of the fixing groove 6111 on the connecting plate 611, into which the protruding portion of the arc-shaped protrusion 632 is inserted. This allows for quick replacement of the cleaning block 613 and facilitates its removal.

[0060] 12 and 13 , the driving member 62 includes a vertically arranged rotating rod 621 and two horizontally arranged adjusting rods 622, wherein the two ends of the rotating rod 621 are fixedly sleeved with a first gear 623 and a second gear 624, and a third gear 5121 meshing with the first gear 623 is fixedly provided on the outer periphery of the driving rod 512. The first gear 623 and the third gear 5121 are bevel gears, and the second gear 624 is a normal gear.

[0061] A first rack 625 is fixedly provided on the side of the adjusting rod 622 facing the second gear 624, wherein the length direction of the first rack 625 is parallel to the length direction of the adjusting rod 622, and one end of the adjusting rod 622 is fixedly connected to the connecting plate 611, and the connecting plate 611 can slide along the length direction of the adjusting rod 622.

[0062] 8 and 9 , a guide frame 18 for slidingly limiting the two adjusting rods 622 is fixedly provided on the outer side surface of the valve body 1. A first rack 625 is provided on the adjusting rod 622 located below the rotating rod 621 of the two adjusting rods 622, and the other one only serves as a support and guide. This is a conventional support structure and will not be described in detail here.

[0063] Rotation of the handwheel 511 causes the rotating rod 621 to rotate about its own axis, which in turn causes the first rack 625 to slide along the length of the adjusting rod 622, which in turn causes the cleaning member 61 to slide along the length of the adjusting rod 622, ultimately cleaning the outer surface of the observation cover 12. When the butterfly valve is in the closed state, the cleaning member 61 is located on the side of the observation cover 12 closest to the driving member 62; when the butterfly valve is in the open state, the cleaning member 61 is located on the side of the observation cover 12 away from the driving member 62.

[0064] Referring to Figure 12 , the rotating rod 621 is a telescopic rod with adjustable length. Once adjusted, the rotating rod 621 is locked in place using a butterfly bolt. This is a conventional telescopic structure and will not be described in detail here. This arrangement allows for adjustments based on the specific application of the butterfly valve. For example, when cleaning the exterior of the observation cover 12 is not necessary, the overall length of the rotating rod 621 can be shortened, and the first rack 625 and second gear 624 can be disengaged.

[0065] Referring to Figures 12 and 14 , a protective assembly 7 for protecting the driver 62 is provided on the exterior of the valve body 1. The protective assembly 7 comprises a housing 71 secured to the exterior of the valve body 1 and a door 72 mounted on the housing 71. One side of the door 72 is hinged to the housing 71, and the other side of the door 72 is detachably connected to the housing 71 via a conventional locking mechanism. A clearance notch is provided on the bottom side of the housing 71 for the adjustment rod 622 and the first rack 625 to pass through. This arrangement reduces the impact of external impurities on the meshing of the first gear 623 and the third gear 5121, and the meshing of the second gear 624 and the first rack 625.

[0066] Referring to Figure 12 , the inner wall of the housing 71 is provided with a stopper 73 that limits the circumferential and axial position of the rotating rod 621, thereby preventing radial movement or axial sliding of the rotating rod during rotation. This is a conventional stopper structure and will not be described in detail here. In other embodiments, a support structure (not shown) may be provided on the side of the guide frame 18 to provide rotational support for the lower end of the rotating rod 621. This means that there are multiple structures for limiting and supporting the rotating rod, and this will not be described in detail here.

[0067] Unless otherwise defined, the terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "A" or "one" and other similar words do not indicate a quantity limit, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A butterfly valve for use in ultra-low temperature environments, comprising a valve body (1), a butterfly plate (2) located inside the valve body (1), a valve seat (3) cooperating with the butterfly plate (2), a valve stem (4) fixed to the butterfly plate (2), and an operating assembly (5) for driving the valve stem (4) to rotate; It is characterized by: The valve body (1) is provided with a manhole (11) and an observation cover (12) covering the manhole (11), and the observation cover (12) is detachably connected to the outer edge of the manhole (11); the operating assembly (5) includes a transmission member (52) linked to the valve stem (4) and an operating wheel (51) for driving the transmission member (52) to operate, the operating wheel (51) includes a handwheel (511) and a driving rod (512) fixed to one side of the handwheel (511), and the driving rod (512) is used to drive the transmission member (52) to operate; The outer side surface of the valve body (1) is provided with a cleaning assembly (6), and the cleaning assembly (6) includes a cleaning member (61) located above the observation cover (12) and a driving member (62) for driving the cleaning member (61) to slide back and forth on the upper side surface of the observation cover (12). When the operating wheel (51) rotates, the driving member (62) is driven to operate, and one side of the cleaning member (61) abuts against the upper side surface of the observation cover (12); The cleaning member (61) comprises a connecting plate (611), a fixing plate (612), and a cleaning block (613) arranged on one side of the fixing plate (612); a side of the fixing plate (612) away from the cleaning block (613) is detachably connected to the connecting plate (611); and the driving member (62) is configured to drive the connecting plate (611) to slide. The driving member (62) includes a vertically arranged rotating rod (621) and a horizontally arranged adjusting rod (622); a first gear (623) and a second gear (624) are respectively provided at both ends of the rotating rod (621); and a third gear (5121) meshing with the first gear (623) is provided on the outer periphery of the driving rod (512); A first rack (625) is provided on the side of the adjusting rod (622) facing the second gear (624), and the length direction of the first rack (625) is parallel to the length direction of the adjusting rod (622). One end of the adjusting rod (622) is fixedly connected to the connecting plate (611), and the connecting plate (611) can slide along the length direction of the adjusting rod (622).

2. The butterfly valve for use in ultra-low temperature environments according to claim 1, characterized in that: A positioning ring groove (15) for the valve seat (3) to be placed is provided on the inner wall of the valve body (1), and a fixing member (16) for limiting the position of the valve seat (3) is provided inside the valve body (1).

3. The butterfly valve for use in ultra-low temperature environments according to claim 2, characterized in that: The fixing member (16) comprises a plurality of arc-shaped plates (161) located on a side of the valve seat (3) away from the positioning ring groove (15) and locking bolts (162) for fixing the arc-shaped plates (161).

4. The butterfly valve for use in ultra-low temperature environments according to claim 1, characterized in that: The connecting plate (611) is provided with a fixing groove (6111) for inserting the fixing plate (612), an elastic clamping member (63) is provided on the side surface of the fixing plate (612), and a positioning groove (6112) is provided on the side wall of the fixing groove (6111) for inserting the elastic clamping member (63).

5. The butterfly valve for use in ultra-low temperature environments according to claim 1, characterized in that: The rotating rod (621) is a telescopic rod with adjustable length and lockable structure.

6. The butterfly valve for use in ultra-low temperature environments according to claim 5, characterized in that: A protection assembly (7) for protecting the driving member (62) is provided on the outside of the valve body (1). The protection assembly (7) comprises a box body (71) and a box door (72) installed on the box body (71).

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