CN213512112U - Short-rod low-temperature stop valve - Google Patents

Abstract

The embodiment of the utility model discloses short-rod low-temperature stop valve. The utility model discloses a short-rod low temperature stop valve includes: valve body, valve gap, valve rod, valve clack and top cap, valve body cavity set up, and the valve gap setting is equipped with the third through-hole on the valve gap on the valve body, and the valve rod setting is equipped with first draw-in groove in the third through-hole on the valve rod top, and the valve clack setting is in the bottom of valve rod, and the top cap setting is equipped with first arch and second draw-in groove on the top cap at the top of valve gap, and the second draw-in groove is used for the joint in the outside. The utility model discloses a short-rod low temperature stop valve through setting up valve body, valve gap, valve rod and valve clack, realizes the control flap and opens and shuts and the regulation of flow, through setting up the top cap to set up the second draw-in groove on the top cap, make the top cap joint on the valve gap, the top of valve rod is equipped with first draw-in groove, be equipped with on the top cap with the first arch of first draw-in groove looks adaptation, rotatory top cap is the height of adjustable valve rod promptly when using, and does not set up the filler, the valve rod need not to set up longer.

Description

Short-rod low-temperature stop valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to short-rod low temperature stop valve.

Background

The low-temperature stop valve is a valve with a valve clack moving along the central line of a valve seat, and can regulate and control the flow of a pipeline or cut off the pipeline.

Typically, a low temperature shut-off valve typically comprises: valve body, valve gap, valve rod and valve clack isotructure, and in order to improve the leakproofness between valve rod top and the valve gap, most low temperature stop valves can set up the filler at the top of valve gap, because the temperature of the pipeline of low temperature stop valve installation is lower, in order to guarantee the performance of packing, can set up longer valve rod.

However, in the case where a small installation space is required in actual use, a long-rod low-temperature shutoff valve is inconvenient to use, and thus it is necessary to design a low-temperature shutoff valve in which a valve rod does not need to be too long.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a short-rod low temperature stop valve, through setting up valve body, valve gap, valve rod and valve clack, realize the control flap and open and shut and the regulation of flow, through setting up the top cap to set up the second draw-in groove on the top cap, make the top cap joint on the valve cap, the top of valve rod is equipped with first draw-in groove, be equipped with on the top cap with the first arch of first draw-in groove looks adaptation, rotatory top cap is the height of adjustable valve rod promptly when using, and does not set up the filler, the valve rod need not to set up longer.

The embodiment of the utility model provides a short-rod low temperature stop valve, include: the valve comprises a valve body, a valve cover, a valve rod, a valve clack and a top cover;

the valve body is arranged in a hollow mode, a feeding hole, a discharging hole, a first through hole and a second through hole are formed in the valve body, a first inner cavity and a second inner cavity are formed in the valve body, the first inner cavity is communicated with the feeding hole and the first through hole, the second inner cavity is communicated with the discharging hole, and the second through hole is used for communicating the first inner cavity with the second inner cavity;

the valve cover is arranged on the valve body, a third through hole is formed in the valve cover, a first thread is arranged on the third through hole, and the valve cover is used for covering the first through hole;

the valve rod is arranged in the third through hole, a second thread is arranged on the valve rod, the first thread is matched with the second thread, and a first clamping groove is formed in the top end of the valve rod;

the valve clack is arranged at the bottom end of the valve rod and is used for covering the first through hole;

the top cap sets up the top of valve gap, be equipped with first arch and second draw-in groove on the top cap, first arch is used for the joint to be in the first draw-in groove, just first arch is used for the top cap drives when rotating the valve rod rotates, the second draw-in groove is used for the joint to be in the outside of valve gap, just the second draw-in groove is used for sealing the top of valve gap.

Through setting up the valve body, the valve gap, valve rod and valve clack, make the feed inlet on the material from the valve body, second through-hole and discharge gate circulate, through setting up the valve gap on first through-hole, and set up valve rod screw-thread fit in the valve gap, set up the bottom at the valve rod with the valve clack again, top at the valve rod sets up first draw-in groove, with the top cap through first arch and second draw-in groove joint respectively on first draw-in groove and valve gap, twist during the use and twist the position that the top cap is adjustable valve clack and is located the valve body soon, realize the regulation of flow, and seal the clearance between valve rod and valve gap through the top cap at the top, need not to set up the filler, therefore the valve rod need not to set up too long, can effectively satisfy specific user demand, it is longer to have solved among the prior art.

In one possible embodiment, the method further comprises: a bottom cover;

the bottom cover is sleeved on the valve rod, a second protrusion is arranged on the bottom cover, a third clamping groove matched with the second protrusion is arranged on the valve cover, and the height of the third clamping groove is larger than the height of the valve clack descending when the valve clack seals the second through hole. The bottom can be followed to the setting like this and the clearance between valve rod and the valve gap is sealed, reduces the possibility that the material spills over in the clearance between valve rod and the valve gap, and sets up the protruding and third draw-in groove of second, makes the valve rod at the in-process from top to bottom, and the second is protruding to be located the third draw-in groove all the time, makes airtight effect better.

In one possible embodiment, the method further comprises: a first gasket;

the bottom cover is provided with a first groove, the first gasket is arranged in the first groove, and the first gasket is used for sealing a gap between the bottom cover and the valve rod. The sealing effect between bottom cap and the valve rod can be improved to the setting like this, reduces the material and moves the possibility to first screw thread department from the clearance between bottom cap and the valve rod.

In a feasible scheme, a diversion trench is formed in the valve cover or the bottom cover and is used for communicating the top of the third clamping groove with the first inner cavity. Because when using, the second bulge loop or take place to rotate in the third draw-in groove, the material has the possibility of moving to the third draw-in groove relatively, sets up the guiding gutter on third draw-in groove or second arch, enables the material that moves to the third draw-in groove and effectively flows out, guarantees that the valve rod can normal up-and-down motion.

In one possible embodiment, a third protrusion is provided on the top cover, and the third protrusion is used for sealing a gap between the valve rod and the valve cover. The third convex ring extends between the valve rod and the valve cover, and the valve cover and the valve rod are sealed from the top.

In one possible embodiment, the method further comprises: fixing the bolt;

the top cover is provided with an air passage, the air passage communicates the space enclosed by the first protrusion and the second clamping groove with the outside, the top cover is provided with a threaded hole, the fixing bolt is screwed in the threaded hole, and the fixing bolt is used for controlling the opening and closing of the air passage. Set up like this, carry out the control that opens and shuts to the air flue through fixing bolt, when staff adjusting valve flow, open the air flue, be convenient for pass through the air flue business turn over, reduce the produced resistance of airtight space between rotatory valve rod compression top cap and the valve gap, rethread fixing bolt closed air flue after the adjustment finishes.

In one possible embodiment, the method further comprises: rotating the handle;

the top cover is provided with a special-shaped groove, the rotary handle is provided with a bulge matched with the special-shaped groove, and the rotary handle is used for a worker to rotate the top cover. Set up like this and rotate the valve rod through rotatory handle, increase moment reduces the operation degree of difficulty, and sets up through the joint mode, can get at any time and put rotatory handle.

In a feasible scheme, the top cover is provided with a first scale mark and a second scale mark, the first scale mark is used for contrasting the position of the valve clack covering the second through hole, and the second scale mark is used for contrasting the position of the valve clack fully opened. Set up like this and be convenient for the staff and know the condition that opens and shuts of valve, and when the top cap descends to first scale mark, the valve is not closed completely, can know the valve clack and damage.

In a feasible scheme, a first step surface is arranged on the valve cover, and a second step surface matched with the first step surface is arranged on the valve body. The sealing effect between the valve cover and the valve body can be improved by the arrangement.

In one possible embodiment, the method further comprises: a second gasket;

the first step surface and the second step surface are respectively provided with a second groove and a third groove, and the second gasket is arranged in the second groove and the third groove. Set up like this, further promote the sealed effect between valve gap and the valve body.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic view of the overall structure of a low-temperature stop valve in an embodiment of the present invention;

fig. 2 is a schematic sectional structure view of the low temperature stop valve in the embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the valve stem and the bottom cap according to the embodiment of the present invention;

fig. 4 is a schematic sectional three-dimensional structure view of the top cover in the embodiment of the present invention;

fig. 5 is a schematic sectional view of a valve cover according to an embodiment of the present invention.

Reference numbers in the figures:

1. a valve body; 2. a valve cover; 3. a valve stem; 4. a valve flap; 5. a top cover; 6. a feed inlet; 7. a discharge port; 8. a first through hole; 9. a second through hole; 10. a first lumen; 11. a second lumen; 12. a third through hole; 13. a first card slot; 14. a first protrusion; 15. a second card slot; 16. a bottom cover; 17. a second protrusion; 18. a third card slot; 19. a first gasket; 20. a first groove; 21. a diversion trench; 22. a third protrusion; 23. fixing the bolt; 24. an airway; 25. rotating the handle; 26. a first scale mark; 27. a second scale mark; 28. a second gasket.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; the connection can be mechanical connection, electrical connection or communication connection; either directly or indirectly through intervening media, either internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is the embodiment of the utility model provides an in the overall structure schematic diagram of low temperature stop valve, fig. 2 is the embodiment of the utility model provides an in the section structure schematic diagram of low temperature stop valve, fig. 3 is the embodiment of the utility model provides an in the section structure schematic diagram of valve rod and bottom, fig. 4 is the embodiment of the utility model provides an in the embodiment of the section spatial structure schematic diagram of top cap, fig. 5 is the embodiment of the utility model provides an in the embodiment of the section structure schematic diagram of valve. As shown in fig. 1 to 5, the short rod low temperature stop valve of the present embodiment includes: the valve comprises a valve body 1, a valve cover 2, a valve rod 3, a valve clack 4 and a top cover 5, wherein the valve body 1 is arranged in a hollow manner, the valve body 1 is provided with a feed inlet 6, a discharge outlet 7, a first through hole 8 and a second through hole 9, a first inner cavity 10 and a second inner cavity 11 are arranged in the valve body 1, the first inner cavity 10 is communicated with the feed inlet 6 and the first through hole 8, the second inner cavity 11 is communicated with the discharge outlet 7, the second through hole 9 is used for communicating the first inner cavity 10 with the second inner cavity 11, the valve cover 2 is arranged on the valve body 1, the valve cover 2 is provided with a third through hole 12, the third through hole 12 is provided with a first thread, the valve cover 2 is used for covering the first through hole 8, the valve rod 3 is arranged in the third through hole 12, the valve rod 3 is provided with a second thread, the first thread is matched with the second thread, the top end of the valve rod 3 is provided with a first clamping groove 13, be equipped with first arch 14 and second draw-in groove 15 on the top cap 5, first arch 14 is used for the joint in first draw-in groove 13, and first arch 14 is used for driving valve rod 3 to rotate when top cap 5 rotates, and second draw-in groove 15 is used for the joint in the outside of valve gap 2, and second draw-in groove 15 is used for the top of sealed valve gap 2.

Specifically, in this embodiment, the valve body 1 is configured as a three-way, a partition plate is integrally disposed inside the valve body 1, the partition plate divides the inner cavity of the valve body 1 into a first inner cavity 10 and a second inner cavity 11, the feed inlet 6 and the discharge outlet 7 are respectively disposed at the left and right sides of the valve body 1, the first through hole 8 is disposed at the top of the valve body 1, the second through hole 9 is disposed on the partition plate, the second through hole 9 is disposed right below the first through hole 8, the valve cap 2 covers the first through hole 8, the third through hole 12 on the valve rod 3 and the second through hole 9 are coaxially disposed, the valve flap 4 is disposed at the bottom end of the valve rod 3, the first thread is disposed on the inner side wall of the through hole of the valve cap 2, the top end of the valve rod 3 is disposed with a first slot 13, the first slot 13 is non-circular, the top cap 5 is cylindrical, the bottom surface of the top cap 5 is hollowed, and the, second draw-in groove 15 and 5 fretworks departments of top cap, with 5 joints of top cap on valve rod 3 during the use, and the inside wall of second draw-in groove 15 this moment is laminated mutually with the outside wall at 2 tops of valve gap, and rotatory top cap 5 can drive valve rod 3 and rotate during the use, and then drives valve clack 4 and reciprocates.

Through the discovery that it is difficult to find that the low temperature stop valve of this application seals the valve rod 3 top through second draw-in groove 15 on top cap 5, does not set up the filler, consequently can be shorter with the length setting of valve rod 3, can use under the not enough condition in space.

In addition, it should be noted that the term "inlet port 6" means an inlet port for the material, and the term "outlet port 7" means an outlet port for the material, but the term may be used in practice, that is, the inlet port 6 is used as an outlet port for the material, and the outlet port 7 is used as an inlet port for the material.

Further, the method also comprises the following steps: the bottom cover 16 is sleeved on the valve rod 3, the second protrusion 17 is arranged on the bottom cover 16, the third clamping groove 18 matched with the second protrusion 17 is arranged on the valve cover 2, and the height of the third clamping groove 18 is larger than the descending height of the valve clack 4 when the second through hole 9 is sealed.

Specifically, in this embodiment, the bottom cover 16 is a hollow cylinder, an upper side portion of the bottom cover 16 is hollowed, a second protrusion 17 is formed on a side wall of the hollowed portion, a height of the second protrusion 17 is equal to a height of the third clamping groove 18, when the valve flap 4 is located at the highest position, the valve is completely opened, a top end of the second protrusion 17 is attached to a top surface of the third clamping groove 18, when the valve flap 4 is located at the lowest position, the valve is closed, a top end of the second protrusion 17 is still located in the third clamping groove 18, so that the side wall of the second protrusion 17 can be always attached to the side wall of the third clamping groove 18, and the possibility that a material enters the space between the valve stem 3 and the valve cover 2 from a gap between the second protrusion 17 and the third clamping groove 18 can be reduced.

In addition, because the bottom cover 16 and the valve rod 3 are in a sealed state, when the valve is opened and closed, the air volume between the bottom cover 16 and the valve rod 3 can be changed, which increases the difficulty of the operator to rotate the valve rod 3, and therefore, a sufficient space needs to be arranged between the bottom cover 16 and the valve rod 3 for air compression or expansion, so that the operator can normally rotate the valve rod 3.

Further, the method also comprises the following steps: and a first gasket 19, wherein the bottom cover 16 is provided with a first groove 20, the first gasket 19 is arranged in the first groove 20, and the first gasket 19 is used for sealing a gap between the bottom cover 16 and the valve rod 3. Specifically, in the present embodiment, the first gasket 19 is a flexible gasket, and the inner diameter of the first gasket 19 is smaller than the outer diameter of the valve rod 3, when in use, the first gasket 19 is first installed in the bottom cover 16, and then the bottom cover 16 is sleeved on the fixed position of the valve rod 3, so that the sealing effect between the bottom cover 16 and the valve rod 3 can be improved.

Further, a diversion groove 21 is formed in the valve cover 2 or the bottom cover 16, and the diversion groove 21 is used for communicating the top of the third clamping groove 18 with the first inner cavity 10. Specifically speaking, in this embodiment, guiding gutter 21 sets up on the lateral wall of the outside of third draw-in groove 18, and the height of guiding gutter 21 equals with the height of third draw-in groove 18, and when using, owing to need the valve that opens and shuts, when the valve is closed or not open completely, the material has the possibility of getting into in the third draw-in groove 18 through the clearance between bottom 16 and valve gap 2, can influence valve rod 3 like this and reciprocate, sets up like this and can make the material in the third draw-in groove 18 normally flow out when the second is protruding 17 rises, guarantees the normal use of valve.

Further, a third protrusion 22 is provided on the top cover 5, and the third protrusion 22 is used for sealing a gap between the valve rod 3 and the bonnet 2. Specifically, in the present embodiment, the third protrusion 22 extends between the valve stem 3 and the bonnet 2, and the top end of the third protrusion 22 abuts against the top end of the second thread, so that the contact area between the third protrusion 22 and the side walls of the valve stem 3 and the bonnet 2 can be enlarged to the maximum, and the sealing effect can be improved to the maximum.

Further, the method also comprises the following steps: fixing bolt 23 is equipped with air flue 24 on the top cap 5, and air flue 24 communicates the space that first arch 14 and second draw-in groove 15 enclose with the external world, is equipped with the screw hole on the top cap 5, and fixing bolt 23 revolves soon in the screw hole, and fixing bolt 23 is used for controlling opening and shutting of air flue 24. Specifically speaking, in this embodiment, air flue 24 sets up in top cap 5, fixing bolt 23 revolves soon in top cap 5's threaded hole, when fixing bolt 23 was screwed up completely, fixing bolt 23's one end extended to in the air flue 24, and then close air flue 24, when needing to open and shut the valve, earlier loosen fixing bolt 23, make the inner space and the external intercommunication of second draw-in groove 15, be convenient for rotate valve rod 3, and set up like this and can be when the valve is closed, set up top cap 5 into the upper surface of inside wall and valve gap 2's top surface and laminate mutually, make this moment valve rod 3, valve gap 2 and top cap 5 be almost solid state, the height of furthest reduction valve. And set up screw hole and air flue 24 respectively, not set up the screw hole on air flue 24, can be in the adjustment only rotatory fixing bolt 23, need not to take off fixing bolt 23, facilitate the use more.

In addition, because the third protrusion 22 is further provided, the air passage 24 needs to communicate with the space between the third protrusion 22 and the first protrusion 14 and the space in the bracket between the third protrusion 22 and the second slot 15 at the same time when the air passage is provided.

Further, the method also comprises the following steps: the rotating handle 25 is provided with a special-shaped groove on the top cover 5, the rotating handle 25 is provided with a bulge matched with the special-shaped groove, and the rotating handle 25 is used for a worker to rotate the top cover 5. Specifically speaking, in this embodiment, rotatory handle 25 passes through protruding joint on top cap 5, drives top cap 5 through rotating rotatory handle 25 during the use and rotates, drives valve rod 3 again and reciprocates, realizes opening and shutting of valve, and the fixed mode of rotatory handle 25 is the joint setting, can pack up rotatory handle 25 when need not the adjustment.

Furthermore, the top cover 5 is provided with a first scale mark 26 and a second scale mark 27, the first scale mark 26 is used for comparing the position of the valve flap 4 covering the second through hole 9, and the second scale mark 27 is used for comparing the position of the valve flap 4 fully opened. Specifically, in the present embodiment, the first scale mark 26 and the second scale mark 27 are vertically disposed on the outer sidewall of the valve cover 2, and the first scale mark 26 and the second scale mark 27 are disposed to facilitate observing the opening and closing condition of the valve.

Furthermore, a first step surface is arranged on the valve cover 2, and a second step surface matched with the first step surface is arranged on the valve body 1. Specifically speaking, in this embodiment, be equipped with the annular groove on the valve body 1, form first step face, be equipped with the annular bulge on the valve gap 2, form second step face, and the diameter of annular groove equals with the bellied diameter of annular, sets up like this and makes two step faces laminate mutually when making valve gap 2 install on valve body 1, improves the sealed effect between valve body 1 and the valve gap 2.

Further, the method also comprises the following steps: the second gasket 28, the first step surface and the second step surface are respectively provided with a second groove and a third groove, and the second gasket 28 is arranged in the second groove and the third groove. Specifically, in this embodiment, the second gasket 28 is a flexible gasket, and when the valve cap 2 is mounted, the second gasket 28 is clamped in the second groove, and then the valve cap 2 is fixed on the valve body 1, and the height of the second gasket 28 is greater than the sum of the heights of the second groove and the third groove, so that the second gasket 28 is in a compressed state after the valve cap 2 is fixed, and the sealing effect between the valve body 1 and the valve cap 2 is further improved.

In the present application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first feature or the second feature or indirectly contacting the first feature or the second feature through an intermediate.

Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A short rod cryogenic stop valve comprising: the valve comprises a valve body, a valve cover, a valve rod, a valve clack and a top cover;

the valve body is arranged in a hollow mode, a feeding hole, a discharging hole, a first through hole and a second through hole are formed in the valve body, a first inner cavity and a second inner cavity are formed in the valve body, the first inner cavity is communicated with the feeding hole and the first through hole, the second inner cavity is communicated with the discharging hole, and the second through hole is used for communicating the first inner cavity with the second inner cavity;

the valve cover is arranged on the valve body, a third through hole is formed in the valve cover, a first thread is arranged on the third through hole, and the valve cover is used for covering the first through hole;

the valve rod is arranged in the third through hole, a second thread is arranged on the valve rod, the first thread is matched with the second thread, and a first clamping groove is formed in the top end of the valve rod;

the valve clack is arranged at the bottom end of the valve rod and is used for covering the first through hole;

the top cap sets up the top of valve gap, be equipped with first arch and second draw-in groove on the top cap, first arch is used for the joint to be in the first draw-in groove, just first arch is used for the top cap drives when rotating the valve rod rotates, the second draw-in groove is used for the joint to be in the outside of valve gap, just the second draw-in groove is used for sealing the top of valve gap.

2. The short rod cryogenic stop valve of claim 1, further comprising: a bottom cover;

the bottom cover is sleeved on the valve rod, a second protrusion is arranged on the bottom cover, a third clamping groove matched with the second protrusion is arranged on the valve cover, and the height of the third clamping groove is larger than the height of the valve clack descending when the valve clack seals the second through hole.

3. The short rod cryogenic stop valve of claim 2, further comprising: a first gasket;

the bottom cover is provided with a first groove, the first gasket is arranged in the first groove, and the first gasket is used for sealing a gap between the bottom cover and the valve rod.

4. The short rod low temperature stop valve of claim 2, wherein a guiding groove is formed on the valve cover or the bottom cover, and the guiding groove is used for communicating the top of the third clamping groove with the first inner cavity.

5. The short-rod low-temperature stop valve according to claim 1, wherein a third protrusion is arranged on the top cover and used for sealing a gap between the valve rod and the valve cover.

6. The short rod cryogenic stop valve of claim 1, further comprising: fixing the bolt;

the top cover is provided with an air passage, the air passage communicates the space enclosed by the first protrusion and the second clamping groove with the outside, the top cover is provided with a threaded hole, the fixing bolt is screwed in the threaded hole, and the fixing bolt is used for controlling the opening and closing of the air passage.

7. The short rod cryogenic stop valve of claim 1, further comprising: rotating the handle;

the top cover is provided with a special-shaped groove, the rotary handle is provided with a bulge matched with the special-shaped groove, and the rotary handle is used for a worker to rotate the top cover.

8. The short-rod low-temperature stop valve as claimed in claim 1, wherein the top cover is provided with a first scale mark and a second scale mark, the first scale mark is used for contrasting the position of the valve flap covering the second through hole, and the second scale mark is used for contrasting the position of the valve flap fully opened.

9. The short rod low temperature stop valve of claim 1, wherein the valve cover is provided with a first step surface, and the valve body is provided with a second step surface adapted to the first step surface.

10. The short stem cryogenic stop valve of claim 9, further comprising: a second gasket;

the first step surface and the second step surface are respectively provided with a second groove and a third groove, and the second gasket is arranged in the second groove and the third groove.

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