Low-temperature stop valve

Abstract

The invention relates to the technical field of valves, in particular to a low-temperature stop valve which comprises a valve body, a valve seat fixedly arranged in the valve body, a valve clack located above the valve seat and a valve rod driving the valve clack to reciprocate. A protruding part is fixedly arranged on the valve body, a mounting opening is formed in the protruding part, and a valve deck used for blocking the mounting opening is arranged above the valve body. The valve cover comprises a mounting part fixedly arranged on the valve body and an extension part fixedly arranged on one side of the mounting part, the extension part is provided with a threaded through hole which is communicated with the mounting opening and allows the valve rod to be screwed in and penetrate through, and a hand wheel is coaxially and fixedly arranged on the outer end part of the valve rod; two protective covers are symmetrically arranged outside the extending part, the edges of the lower sides of the protective covers are hinged to the peripheral face of the protruding part, receding notches allowing the extending part to be clamped in are formed in the side faces, close to each other, of the upper portions of the two protective covers, and a locking piece is arranged outside the valve body. In the application, the possibility of collision and damage of the extension part in the transportation process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a low-temperature stop valve. Background Art

[0002] Cryogenic globe valves, as key fluid control components specially designed to adapt to extreme low temperature environments, are widely used in many fields with extremely high requirements for cryogenic fluid control. These valves can still maintain excellent performance and sealing under ultra-low temperature conditions, ensuring that the fluid system operates safely and efficiently. They use cryogenic fluids as working media and demonstrate reliability and durability in extreme environments.

[0003] In terms of technical implementation, a typical low-temperature stop valve structure includes a valve body, a valve seat fixed in the valve body, a valve disc located on the valve seat, and a valve cover covering the valve body. A valve stem is cleverly set on the outside of the valve body, and a threaded hole is opened on the valve cover for the internal threaded part of the valve stem to be inserted and extended into the inside of the valve body. The inner end of the valve stem is closely connected to the valve disc to ensure its stable transmission; while the outer end is coaxially fixed with the handwheel for easy manual operation. When the operator turns the handwheel, the valve stem rotates accordingly, thereby driving the valve disc to move up and down above the valve seat. When the valve disc moves down precisely to the valve seat position, its sealing surface fits tightly with the sealing surface of the valve seat, thereby effectively blocking the flow of the medium and achieving precise fluid control.

[0004] However, since this type of stop valve is designed for low-temperature environments, in order to reduce the potential impact of low temperature on valve performance, the length of the valve cover is often deliberately designed to be longer. The design of the extended valve cover can ensure that the temperature of the packing area on the top of the valve cover is always in a range suitable for normal operation, preventing the packing and parts on the upper part of the valve cover from frosting or freezing due to partial overcooling of the stuffing box; in addition, it can ensure that the deep cold state will not be transmitted to the operating actuator, so that the valve can be operated at the maximum pressure difference and the deepest cold at any time.

[0005] Although this design effectively reduces the conduction of low temperature to other parts of the valve, it also brings new problems. During the transportation of the finished stop valve, the long protruding part of the valve cover is very susceptible to collision and damage, which affects the corresponding service life. There is room for improvement. Summary of the invention

[0006] The purpose of the present application is to provide a low-temperature stop valve to solve the problem in the above-mentioned related art that the extended portion of the valve cover is easily damaged by bumps during transportation.

[0007] The low temperature stop valve provided in this application adopts the following technical solution: The closure of the valve body is a function of the valve body being actuated by the spring which is adapted to engage the closure of the valve body and to engage the closure of the valve body with the closure being a function of the closure being actuated by the spring.

[0008] By adopting the above technical solution, during the transportation of the stop valve, due to the combined arrangement of the locking piece and the two protective covers, the protective cover is rotated upward to a state parallel to the valve stem, and is fixed in place by the locking piece, thereby reducing the possibility of the extension part being bumped or damaged during transportation; when the stop valve is used, the two protective covers are also used to protect the extension part, and at this time, the two protective covers also simultaneously protect the connection between the valve cover and the valve body, reducing the possibility of rust on the surface of the connection due to the external humid environment.

[0009] Optionally, the protective cover includes a connecting part and a rotating part, one side of the connecting part is hinged to the outer peripheral surface of the protruding part, the edge of the connecting part away from the protruding part is rotatably connected to the rotating part, and an adjusting member for adjusting and fixing the rotation angle of the connecting part and the rotating part is provided outside the valve body.

[0010] By adopting the above technical solution, due to the split setting of the protective cover, the protective cover is divided into two parts: a connecting part and a rotating part, so that the state of the protective cover can be adjusted according to actual needs, thereby improving the corresponding use performance.

[0011] Optionally, a baffle is fixedly provided on the outer periphery of the extension portion located outside the protective cover, and an extrusion plate is fixedly provided on the outer periphery of the valve stem exposed outside, which is located on the side of the baffle away from the protective cover, and a plurality of guide through holes are provided on the baffle along the length direction of the valve stem; a locking rod slidably arranged in the guide through hole and a reset member driving the locking rod to slide and reset in a direction close to the extrusion plate are provided on the outside of the extension portion; the extrusion plate can move with the valve stem in a direction close to the baffle and squeeze the locking rod, and a locking groove is provided on the rotating portion for inserting the end of the locking rod away from the extrusion plate.

[0012] By adopting the above technical solution, due to the combined arrangement of the baffle, the extrusion plate, the locking rod and the reset member, when the two protective covers are in the transport state to protect the extension part, the valve stem is controlled to rotate so that the extrusion plate overcomes the elastic force of the reset member to squeeze the locking rod, and then the lower end of the locking rod is inserted into the corresponding locking groove, thereby further improving the assembly stability of the two protective covers in this state.

[0013] Optionally, the reset member includes a spring in a compressed state and a retaining ring fixed on the outer periphery of the locking rod, and an installation groove for the retaining ring to be placed is provided on the opening edge of the guide through hole away from the protective cover, and the two ends of the spring are respectively pressed against the bottom side of the installation groove and the side of the retaining ring away from the extrusion plate.

[0014] By adopting the above technical solution, due to the combined arrangement of the spring and the retaining ring, the extrusion plate can squeeze the locking rod as the valve stem moves downward. During this process, the spring is further compressed until the lower end of the locking rod is inserted into the locking groove; when the two protective covers do not protect the extension part, due to the arrangement of the reset member, the downward movement of the valve stem can also be elastically limited, thereby reducing the possibility of damage caused by excessive extrusion of the internal valve disc and the valve seat.

[0015] Optionally, the adjusting member includes an adjusting rod and an adjusting bolt, one end of the adjusting rod is rotatably connected to the connecting part, the other end of the adjusting rod is provided with an adjusting through hole, and the rotating part is provided with a plurality of adjusting screw holes that can overlap with the adjusting through hole, and the adjusting bolt can penetrate the adjusting through hole and then be screwed into the adjusting screw hole.

[0016] By adopting the above technical solution, the user can adjust the connecting part and the rotating part to different states according to actual needs, and then pass the adjusting bolt through the adjusting through hole and screw it into the corresponding adjusting screw hole to fix the states of the connecting part and the rotating part.

[0017] Optionally, the adjusting bolt is a butterfly bolt.

[0018] By adopting the above technical solution, since the adjusting bolt is a butterfly bolt, the user can manually tighten or loosen the adjusting bolt, thereby improving the corresponding adjustment efficiency.

[0019] Optionally, the locking member includes a locking plate and locking blocks fixed on the outer periphery of both ends of the locking plate, and a first locking groove is opened on the two rotating parts. The two locking blocks can be respectively inserted into the corresponding first locking grooves when the two protective covers are in a vertical state.

[0020] By adopting the above technical solution, when the two protective covers are in a vertical state and protect the extension part, the staff can insert the locking blocks on the two locking blocks into the corresponding first locking grooves respectively, so as to fix the two protective covers in this state.

[0021] Optionally, a second locking groove is provided on the two connecting parts, and the rotating part can be rotated in a direction away from the extending part to a state perpendicular to the connecting part and fixed by an adjusting piece; when the rotating part itself is in a perpendicular state to the connecting part, it can rotate along with the connecting part to a state flush with the lowest side of the valve body, and the two locking blocks can be respectively inserted into the corresponding second locking grooves when the rotating part is flush with the lowest side of the valve body.

[0022] By adopting the above technical solution, when the rotating part is flush with the lowest side of the valve body, the two locking blocks are respectively inserted into the corresponding second locking grooves, and the elastic clamping parts are snapped into the corresponding second positioning grooves, so as to lock the two protective covers in this state; at this time, the installation state of the two protective covers can support the stop valve to prevent the stop valve placed on the ground from tipping over (before being installed on the corresponding pipeline); and the fixed rotating part and the connecting part can also serve as installation steps to reduce the difficulty of installation.

[0023] Optionally, the locking block is provided with an elastic clamping piece, the inner wall of the first locking groove is provided with a first positioning groove for the elastic clamping piece to be clamped into, and the inner wall of the second locking groove is provided with a second positioning groove for the elastic clamping piece to be clamped into.

[0024] By adopting the above technical solution, the two locking blocks are respectively inserted into the first locking groove or the second locking groove, and the elastic clip is snapped into the corresponding first positioning groove or the second positioning groove, thereby improving the installation stability of the locking block in the first locking groove and the second locking groove.

[0025] Optionally, the rotating portion and the connecting portion are both provided with flexible fixing belts for fixing the valve installation and removal tool on the side facing the extending portion when the rotating portion and the connecting portion are in the protective state for the extending portion.

[0026] By adopting the above technical solution, the valve installation and disassembly tools can be placed on the inner side of the rotating part and the connecting part in advance; when the stop valve needs to be inspected or disassembled later, the protective cover can be opened to access the tools placed on the inner wall of the protective cover, thereby reducing the difficulty of subsequent installation and disassembly.

[0027] In summary, this application includes the following beneficial technical effects: During the transportation of the stop valve, the protective cover is rotated upward to a state parallel to the valve stem and fixed in place by a locking piece, thereby reducing the possibility of the extension part being bumped or damaged during transportation; when the stop valve is used, two protective covers are also used to protect the extension part. At this time, the two protective covers also simultaneously protect the connection between the valve cover and the valve body, thereby reducing the possibility of rust on the surface of the connection due to the external humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

[0029] Figure 1 This is a schematic diagram of the structure of the valve body and the valve cover installation and matching in the embodiment of the present application; Figure 2 It is a schematic cross-sectional structure diagram of the installation and matching of the valve body and the valve cover in the embodiment of the present application; Figure 3 It is a schematic diagram of the structure of the embodiment of the present application when the protective cover protects the extension part; Figure 4 It is a schematic cross-sectional structure diagram of the installation and matching of the adjusting member in the embodiment of the present application; Figure 5 This is a schematic diagram of the structure of the embodiment of the present application when the protective cover supports the valve body; Figure 6 It is a cross-sectional structural diagram of the locking member installation and cooperation when the protective cover protects the extension part in the embodiment of the present application; Figure 7 yes Figure 6 A magnified schematic diagram of part A; Figure 8 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application embodying the installation and cooperation of the locking rod and the reset member; Fig. 9 It is a cross-sectional structural diagram of the embodiment of the present application embodied in the installation and cooperation of the locking member when the protective cover supports the valve body; Fig.10 yes Fig. 9 Schematic diagram of the enlarged portion B.

[0030] In the figure, 1, valve body; 11, valve seat; 12, protrusion; 121, installation port; 2, valve stem; 21, valve disc; 22, extrusion plate; 3, valve cover; 31, installation part; 32, extension part; 321, threaded through hole; 322, baffle; 3221, guide through hole; 3222, installation sink groove; 4, hand wheel; 5, protective cover; 51, connecting part; 511, second locking groove; 512, second positioning groove; 52, rotating part; 521, clearance gap; 522, adjustment Screw hole; 523, first locking groove; 5231, first positioning groove; 524, locking groove; 53, adjusting member; 531, adjusting rod; 5311, adjusting through hole; 532, adjusting bolt; 5321, butterfly bolt; 54, flexible fixing belt; 6, locking member; 61, locking plate; 62, locking block; 621, placement groove; 63, elastic clip; 631, compression spring; 632, arc-shaped protrusion; 7, locking rod; 8, reset member; 81, spring; 82, retaining ring. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0032] Example: Reference Figure 1 and Figure 2 A low-temperature stop valve comprises a valve body 1, a valve seat 11 fixed in the valve body 1, a valve disc 21 located above the valve seat 11, and a valve stem 2 for driving the valve disc 21 to move back and forth; a protrusion 12 is integrally formed on the valve body 1, wherein the protrusion 12 is provided with an installation opening 121 for the valve disc 21 to be installed, and a valve cover 3 for blocking the installation opening 121 is provided above the valve body 1; The valve cover 3 includes a mounting portion 31 fixed to the valve body 1 by bolts and an extension portion 32 integrally formed on one side of the mounting portion 31. The extension portion 32 is provided with a threaded through hole 321 communicating with the mounting opening 121 and for the valve stem 2 to pass through. A packing cavity (not shown in the figure) for packing is also provided inside the extension portion 32. A hand wheel 4 is coaxially fixed to the outer end of the valve stem 2. When installing the stop valve, first install the valve stem 2 and the valve disc 21 inside the valve body 1 through the installation port 121, and then install the valve cover 3 on the valve body 1 through bolts to block the installation port 121; when in use, connect the flow channel openings on both sides of the valve body 1 to the corresponding pipelines. When the flow channel needs to be controlled, the user drives the valve stem 2 to rotate synchronously by turning the hand wheel 4, and then controls the valve stem 2 and the valve disc 21 to rise and fall, so as to control the flow channel in the valve body 1.

[0033] Reference Figure 3 and Figure 4Two protective covers 5 are symmetrically arranged on the outside of the extension part 32, wherein the lower edge of the protective covers 5 is hinged to the outer peripheral surface of the protruding part 12, and a clearance notch 521 for the extension part 32 to be inserted is opened on the side surfaces of the upper parts of the two protective covers 5 that are close to each other, and a locking piece 6 is arranged on the outside of the valve body 1; when the two protective covers 5 are rotated upward to a vertical state, the outside of the extension part 32 is protected, and the two protective covers 5 are fixed in this state by the locking piece 6, so as to protect the extended extension part 32 during transportation.

[0034] Reference Figure 4 and Figure 5 The protective cover 5 includes a connecting portion 51 and a rotating portion 52. One side of the connecting portion 51 is hinged to the outer peripheral surface of the protruding portion 12. The edge of the connecting portion 51 away from the protruding portion 12 is rotatably connected to the rotating portion 52. An adjusting member 53 for adjusting and fixing the rotation angle of the connecting portion 51 and the rotating portion 52 is provided on the outside of the valve body 1; wherein the clearance notch 521 is provided on the side edge of the rotating portion 52; The adjusting member 53 includes an adjusting rod 531 and an adjusting bolt 532, wherein the adjusting bolt 532 is a butterfly bolt 5321, one end of the adjusting rod 531 is rotatably connected to the connecting portion 51, and the other end of the adjusting rod 531 is provided with an adjusting through hole 5311, and the rotating portion 52 is provided with a plurality of adjusting screw holes 522 that can overlap with the adjusting through holes 5311, and the adjusting bolt 532 can penetrate the adjusting through holes 5311 and then be screwed into the adjusting screw holes 522; the user can adjust the connecting portion 51 and the rotating portion 52 to different states (parallel or vertical) according to actual needs and fix them through the adjusting member 53.

[0035] Reference Figure 6 and Figure 7 The locking member 6 includes a locking plate 61 and locking blocks 62 fixed on the outer periphery of both ends of the locking plate 61. The two rotating parts 52 are provided with first locking grooves 523. When the two protective covers 5 are in a vertical state, the locking blocks 62 on the two locking blocks 62 are respectively inserted into the corresponding first locking grooves 523; the locking block 62 is provided with an elastic clamping member 63, and the inner wall of the first locking groove 523 is provided with a first positioning groove 5231 for the elastic clamping member 63 to be clamped into; The elastic clamping member 63 includes a compression spring 631 and an arc-shaped protrusion 632. A placement groove 621 is provided on the locking block 62 for the compression spring 631 and the arc-shaped protrusion 632 to be placed. The compression spring 631 presses one side of the arc-shaped protrusion 632 so that a part of the arc-shaped protrusion 632 protrudes out of the placement groove 621, and the protruding portion 12 of the arc-shaped protrusion 632 is divided into an arc surface, and the arc length corresponding to the arc surface is a minor arc; when the locking block 62 is inserted into the first locking groove 523, the elastic clamping member 63 is inserted into the first positioning groove 5231.

[0036] Reference Figure 8The extension portion 32 is integrally formed with a baffle 322 on the outer periphery of the protective cover 5, and the baffle 322 can also play the role of a drip plate (the drip plate can effectively block the transmission of the temperature of the low-temperature valve body 1 to the sealing device above and the upper end of the valve stem 2); and the valve stem 2 is fixedly provided with an extrusion plate 22 located on the side of the baffle 322 away from the protective cover 5 on the outer periphery exposed to the outside, and two guide through holes 3221 are opened on the baffle 322 along the length direction of the valve stem 2 and are respectively located above the two rotating parts 52; The outside of the extension portion 32 is provided with a locking rod 7 slidably arranged in the guide through hole 3221, and a reset member 8 that drives the locking rod 7 to slide and reset toward the direction close to the extrusion plate 22; the extrusion plate 22 can move along with the valve stem 2 toward the direction close to the baffle 322 and squeeze the locking rod 7, and the rotating portion 52 is provided with a locking groove 524 for the end of the locking rod 7 away from the extrusion plate 22 to be inserted.

[0037] When the flow channel in the valve body 1 is in a closed state and the two protective covers 5 protect the extension portion 32, the extrusion plate 22 overcomes the elastic force of the reset member 8 to squeeze the locking rod 7, so that the lower end of the locking rod 7 is inserted into the corresponding locking groove 524; in the transportation state, the locking rod 7 can be used to further lock the two protective covers 5, thereby improving the assembly stability of the two protective covers 5 in this state.

[0038] Reference Figure 8 The reset member 8 includes a spring 81 in a compressed state and a retaining ring 82 fixed on the outer periphery of the locking rod 7, wherein an installation recess 3222 for the retaining ring 82 to be placed is provided on the opening edge of the guide through hole 3221 away from the protective cover 5, and the two ends of the spring 81 are respectively pressed against the bottom side of the installation recess 3222 and the side of the retaining ring 82 away from the extrusion plate 22; When the two protective covers 5 are not protecting the extension portion 32 , the reset member 8 can also elastically limit the downward movement of the valve stem 2 , thereby reducing the possibility of damage caused by excessive squeezing of the internal valve disc 21 and the valve seat 11 .

[0039] Reference Fig. 9 and Fig.10 The two connecting parts 51 are provided with second locking grooves 511 for the locking blocks 62 to be inserted into, and the inner wall of the second locking grooves 511 is provided with second positioning grooves 512 for the elastic clamping members 63 to be inserted into; before the stop valve is installed on the corresponding pipeline, the stop valve needs to be placed on the ground in advance, and at this time, the state of the protective cover 5 can be adjusted to support the stop valve to prevent the stop valve placed on the ground from tipping over; The specific adjustment method is as follows: first, rotate the rotating part 52 in the direction away from the extending part 32 to a state perpendicular to the connecting part 51 and fix it through the adjusting part 53, and then rotate the connecting part 51 to a state perpendicular to the length direction of the valve stem 2. At this time, the lower side surface of the rotating part 52 is flush with the lowest side of the valve body 1; when the rotating part 52 is flush with the lowest side of the valve body 1, the two locking blocks 62 are respectively inserted into the corresponding second locking grooves 511, and the elastic clip 63 is snapped into the corresponding second positioning groove 512, so as to lock the two protective covers 5 in this state.

[0040] Reference Fig. 9 When the rotating portion 52 and the connecting portion 51 are in the protective state of the extending portion 32, a flexible fixing belt 54 for fixing the valve installation and removal tools is fixed on the side of the extending portion 32; the staff can place the valve installation and removal tools, cleaning tools, etc. on the inner side of the rotating portion 52 and the connecting portion 51 in advance to reduce the difficulty of subsequent installation and cleaning.

[0041] When the stop valve needs to be inspected and repaired at a later stage, the rotating part 52 and the connecting part 51 can be adjusted to a parallel state and fixed, and then the protective cover 5 as a whole can be rotated along with the connecting part 51 to a state perpendicular to the valve stem 2 and fixed, so as to facilitate the use of installation tools; when the stop valve is used, two protective covers 5 are used to protect the extension part 32. At this time, the two protective covers 5 also synchronously protect the connection between the valve cover 3 and the valve body 1, reducing the possibility of rust on the surface of the connection due to the external humid environment.

[0042] The implementation principle of the embodiment of the present application is: During the transportation of the stop valve, the protective cover 5 is rotated upward to be parallel to the valve stem 2, and is fixed by the locking member 6, the adjusting member 53 and the locking rod 7, thereby reducing the possibility of the extension portion 32 being bumped or damaged during transportation; Before installing the stop valve on the corresponding pipeline, the stop valve needs to be placed on the ground in advance. At this time, the state of the protective cover 5 can be adjusted to support the stop valve to prevent the stop valve placed on the ground from tipping over. When the stop valve is used, the two protective covers 5 are used again to protect the extension portion 32. At this time, the two protective covers 5 also simultaneously protect the connection between the valve cover 3 and the valve body 1, thereby reducing the possibility of rust on the surface of the connection due to the external humid environment. When the stop valve needs to be inspected at a later stage, the rotating part 52 and the connecting part 51 can be adjusted to a parallel state and fixed, and then the protective cover 5 as a whole can be rotated along with the connecting part 51 to a state perpendicular to the valve stem 2 and fixed, so as to facilitate the use of the installation tools placed on the inner side of the protective cover 5.

[0043] Unless otherwise defined, the terms or scientific terms used in this application should be 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. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" 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.

[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low-temperature stop valve, comprising a valve body (1), a valve seat (11) fixedly arranged in the valve body (1), a valve disc (21) located above the valve seat (11), and a valve stem (2) driving the valve disc (21) to move back and forth; a protrusion (12) is fixedly arranged on the valve body (1), a mounting opening (121) is provided on the protrusion (12) for the valve disc (21) to be installed, a valve cover (3) is provided above the valve body (1) for blocking the mounting opening (121); the valve cover (3) comprises a mounting portion (31) fixedly arranged on the valve body (1) and an extension portion (32) fixedly arranged on one side of the mounting portion (31), a threaded through hole (321) is provided on the extension portion (32) and is communicated with the mounting opening (121) and is provided for the valve stem (2) to be screwed in and penetrated, and a hand wheel (4) is coaxially fixedly arranged on the outer end of the valve stem (2); It is characterized in that Two protective covers (5) are symmetrically arranged on the outside of the extension part (32); the lower edges of the protective covers (5) are hinged to the outer peripheral surface of the protruding part (12); the upper sides of the two protective covers (5) close to each other are provided with a clearance notch (521) for the extension part (32) to be inserted into; and a locking piece (6) is arranged on the outside of the valve body (1); when the two protective covers (5) are rotated upward to a vertical state, they protect the outside of the extension part (32) and are fixed in this state by the locking piece (6).

2. A cryogenic shut-off valve according to claim 1, characterized in that: The protective cover (5) comprises a connecting portion (51) and a rotating portion (52); one side of the connecting portion (51) is hinged to the outer peripheral surface of the protruding portion (12); the edge of the connecting portion (51) away from the protruding portion (12) is rotatably connected to the rotating portion (52); and an adjusting member (53) for adjusting and fixing the rotation angle of the connecting portion (51) and the rotating portion (52) is provided on the outside of the valve body (1).

3. A cryogenic shut-off valve according to claim 2, characterized in that: A baffle (322) is fixedly provided on the outer periphery of the extension portion (32) located outside the protective cover (5); an extrusion plate (22) is fixedly provided on the outer periphery of the valve stem (2) exposed to the outside and located on the side of the baffle (322) away from the protective cover (5); and a plurality of guide through holes (3221) are opened on the baffle (322) along the length direction of the valve stem (2); The extension portion (32) is provided with a locking rod (7) slidably arranged in the guide through hole (3221) and a reset member (8) for driving the locking rod (7) to slide and reset in a direction close to the extrusion plate (22); the extrusion plate (22) can move along with the valve stem (2) in a direction close to the baffle plate (322) and squeeze the locking rod (7); the rotating portion (52) is provided with a locking groove (524) for the end of the locking rod (7) away from the extrusion plate (22) to be inserted.

4. A cryogenic shut-off valve according to claim 3, characterized in that: The reset member (8) comprises a spring (81) in a compressed state and a retaining ring (82) fixed on the outer periphery of the locking rod (7); an installation recess (3222) for the retaining ring (82) to be placed is provided on the opening edge of the guide through hole (3221) away from the protective cover (5); two ends of the spring (81) are respectively pressed against the bottom side of the installation recess (3222) and the side of the retaining ring (82) away from the extrusion plate (22).

5. A cryogenic shut-off valve according to claim 2, characterized in that: The adjusting member (53) comprises an adjusting rod (531) and an adjusting bolt (532); one end of the adjusting rod (531) is rotatably connected to the connecting portion (51); the other end of the adjusting rod (531) is provided with an adjusting through hole (5311); the rotating portion (52) is provided with a plurality of adjusting screw holes (522) that can overlap with the adjusting through hole (5311); the adjusting bolt (532) can penetrate the adjusting through hole (5311) and then be screwed into the adjusting screw hole (522).

6. A cryogenic shut-off valve according to claim 5, characterized in that: The adjusting bolt (532) is a butterfly bolt (5321).

7. A cryogenic shut-off valve according to claim 2, characterized in that: The locking member (6) comprises a locking plate (61) and locking blocks (62) fixedly arranged on the outer periphery of both ends of the locking plate (61); first locking grooves (523) are provided on the two rotating parts (52); and the two locking blocks (62) can be respectively inserted into corresponding first locking grooves (523) when the two protective covers (5) are in a vertical state.

8. A cryogenic shut-off valve according to claim 7, characterized in that: The two connecting parts (51) are provided with second locking grooves (511), and the rotating part (52) can be rotated in a direction away from the extending part (32) to a state perpendicular to the connecting part (51) and fixed by an adjusting member (53); When the rotating portion (52) is in a perpendicular state to the connecting portion (51), it can rotate along with the connecting portion (51) to a state where it is flush with the lowest side of the valve body (1), and the two locking blocks (62) can be respectively inserted into the corresponding second locking grooves (511) when the rotating portion (52) is flush with the lowest side of the valve body (1).

9. A cryogenic shut-off valve according to claim 8, characterized in that: The locking block (62) is provided with an elastic clamping piece (63), the inner wall of the first locking groove (523) is provided with a first positioning groove (5231) for the elastic clamping piece (63) to be clamped in, and the inner wall of the second locking groove (511) is provided with a second positioning groove (512) for the elastic clamping piece (63) to be clamped in.

10. A cryogenic shut-off valve according to claim 8, characterized in that: The rotating portion (52) and the connecting portion (51) are both provided with a flexible fixing belt (54) for fixing a valve installation and removal tool on the side facing the extension portion (32) when the rotating portion (52) and the connecting portion (51) are in a state of protecting the extension portion (32).

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