CN218377700U - Stop valve with non-return function - Google Patents

Abstract

The utility model relates to a take stop valve of non return function relates to the valve field. Comprises a valve body, a valve rod and a lifting component; a liquid inlet cavity, a liquid outlet cavity and a valve rod cavity which are communicated with each other are formed in the valve body, and a cut-off through hole is formed in the valve body and used for communicating the liquid inlet cavity with the valve rod cavity; the valve rod penetrates into the valve rod cavity and can move up and down along the axis of the valve rod cavity; the lifting assembly comprises a valve clack, an elastic piece and a pressing piece, the valve clack is positioned above the intercepting channel, and the valve clack is movably connected to the valve rod and can move up and down relative to the valve rod so as to seal or open the intercepting through hole; the pressing piece is fixedly connected to the valve rod and is arranged opposite to the valve clack at intervals; the elastic piece is arranged between the valve clack and the pressing piece. The check valve spring resilience force of the pipeline of the traditional multi-immersed pump system is weakened by connecting the pressing part on the valve rod, so that the fluid backflow risk is caused, and the technical problem of complete closure of the pipeline of the immersed pump system cannot be realized.

Description

Stop valve with non-return function

Technical Field

The utility model relates to a valve field, in particular to take stop valve of non return function.

Background

Generally be equipped with the check valve on LNG many immersed pump system's the pipeline, the effect of check valve prevents the medium refluence in the pipeline, and traditional check valve is after long-term the use, and the resilience force of spring weakens in the check valve, can make the sealed not tight of check valve, and the non return function weakens, has the risk of fluid backward flow, and it is hidden to have certain safety during the use. And when the LNG multi-immersed pump system is maintained, the check valve cannot be completely cut off, and the safety influence on the maintenance process can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a check valve spring resilience of the pipeline of solving current traditional many immersed pump system of LNG weakens, causes the fluid backward flow risk, has safe latent, and can not realize the technical problem who dams completely to the pipeline of immersed pump system.

In order to solve the technical problem, the utility model provides a take stop valve of non return function, include: the valve body is internally provided with a liquid inlet cavity, a liquid outlet cavity and a valve rod cavity which are communicated with each other, and the valve body is provided with a cut-off through hole for communicating the liquid inlet cavity with the valve rod cavity; the valve rod penetrates into the valve rod cavity and can move up and down along the axis of the valve rod cavity; the lifting assembly comprises a valve clack, an elastic piece and a pressing piece, the valve clack is positioned above the intercepting channel, and the valve clack is movably connected to the valve rod and can move up and down relative to the valve rod so as to seal or open the intercepting through hole; the pressing piece is fixedly connected to the valve rod and arranged opposite to the valve clack at an interval, the pressing piece moves up and down along with the valve rod, and the interval distance between the valve clack and the pressing piece can be changed; the elastic piece is arranged between the valve clack and the pressing piece; the pressing piece is located at a first position, the pressure of the elastic piece is smaller than the fluid pressure in the liquid inlet cavity, fluid in the liquid inlet cavity can push the valve clack open, the valve clack moves upwards along the axis of the valve rod, and the intercepting through hole is opened; the fluid pressure of the liquid inlet cavity is weakened, the elastic piece rebounds to press the valve clack to the closure through hole, and the closure through hole is sealed to realize non-return; the pressing piece moves downwards along with the valve rod to a second position, and the pressure of the elastic piece is greater than the fluid pressure in the liquid inlet cavity; the fluid in the liquid inlet cavity can not jack the valve clack, so that the stop is realized.

Optionally, a connecting hole is formed in one side, facing the valve rod, of the valve clack, and the end of the valve rod is slidably arranged in the connecting hole.

Optionally, the elastic member is provided in plurality, and the elastic members are arranged between the valve flap and the pressing member and are arranged at intervals around the axis of the valve rod.

Optionally, the valve further comprises a heat insulation sleeve, the heat insulation sleeve is arranged in the valve rod cavity, and the valve rod penetrates through the heat insulation sleeve.

Optionally, the lifting assembly further comprises a first sealing gasket, a mounting groove is formed on one side of the valve flap facing the shut-off through hole, and the first sealing gasket is arranged in the mounting groove.

Optionally, the lifting assembly further includes a bottom gasket and a retaining nut, the bottom gasket is disposed at the bottom of the valve flap, the bottom gasket presses the inner portion of the first sealing gasket, and the retaining nut penetrates through the bottom gasket and is fixedly connected to the valve flap to fix the first sealing gasket in the mounting groove.

Optionally, the lifting assembly further comprises a connecting nut, the connecting nut is slidably sleeved on the valve rod, and the connecting nut is fixedly connected with the inner side wall of the connecting hole.

Optionally, the valve body includes a detachable valve cover, the valve cover is provided with a through hole for the valve rod to pass through, and the valve rod is connected with the valve cover through threads.

Optionally, the valve cover comprises a valve cover body, a sealing ring and a compression nut, wherein the sealing ring is arranged on the valve rod and is positioned at an outlet of the valve rod penetrating through the valve cover body, and is used for sealing the valve body; the compression nut is arranged on the valve rod, is connected with the valve cover body through threads and is used for compressing and fixing the sealing ring.

Optionally, the valve rod further comprises a manual control part, the manual control part comprises a hand wheel and a hand wheel label, and the hand wheel is arranged on the valve rod and used for controlling the valve rod to move up and down; the hand wheel sign is connected on the hand wheel, and the hand wheel sign is provided with directional scales for judging the rotation angle of the hand wheel.

According to the above technical scheme, the beneficial effects of the utility model are that:

the application is fixed connection pressing piece on the valve rod, and the pressing piece can reciprocate along with the valve rod, and then changes the relative distance of pressing piece and valve clack, makes the elasticity of the elastic component of setting between pressing piece and valve clack change. When the resilience of the elastic piece is weakened and the closure through hole is not tightly sealed, the height of the pressing piece can be properly reduced, the distance between the pressing piece and the valve clack is reduced, the elastic piece can still normally work to stop the fluid, the service life of the equipment is prolonged, and the possible fluid backflow risk is reduced. And can through further reduction the height of pressing the piece, increase the pressure of elastic component, press the valve clack lock tightly on damming the through-hole, the fluid in feed liquor chamber can not push open the valve clack, realizes ending totally to two directions of immersed pump system's pipeline, can reassurance overhauls the pipeline, and the maintenance process is safer.

Drawings

Fig. 1 is a schematic view of a shut-off valve with a check function.

Fig. 2 is a partially enlarged schematic view of fig. 1.

The reference numerals are explained below: 100. a stop valve; 10. a valve body; 101. a lower valve body; 11. a liquid inlet cavity; 12. a liquid outlet cavity; 13. a valve stem cavity; 14. a shut-off through hole; 15. a metal sleeve; 16. a valve body seat; 17. a valve cover; 170. a bonnet body; 171. a third sealing gasket; 172. a hexagon bolt; 173. a gasket; 174. a second sealing gasket; 175. a seal ring; 176. pressing the sleeve; 177. a compression nut; 178. locking a ring; 179. an O-shaped ring; 20. a valve stem; 30. a lifting assembly; 31. a valve flap; 311. connecting holes; 32. an elastic member; 33. a pressing member; 34. a connecting nut; 35. a locking washer; 36. a first sealing gasket; 37. a non-return nut; 38. flattening the cushion; 39. a bottom gasket; 40. a manual control section; 41. a hand wheel; 42. a hand wheel label; 43. a spring washer; 44. a cap nut; 50. a heat-insulating sleeve; 60. a circlip is provided.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it is to be understood that the indications of directions or positional relationships (such as up, down, left, right, front, rear, and the like) in the embodiments shown in the drawings are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, the present embodiment provides a stop valve 100 with a check function, which includes a valve body 10, a valve stem 20, a lifting assembly 30 and a manual control portion 40. The lifting assembly 30 is disposed in the valve body 10 and connected to one end of the valve stem 20 penetrating the valve body 10, and the manual control part 40 is disposed at the other end of the valve stem 20, and the valve stem 20 is moved up and down along the axis by rotating the manual control part 40.

The valve body 10 includes a lower valve body 101, a metal sleeve 15, a valve body seat 16, and a bonnet 17. The upper part of the lower valve body 101 is welded with a metal sleeve 15, the upper part of the metal sleeve 15 is welded with a valve body seat 16, and the valve cover 17 is detachably connected on the valve body seat 16. The metal sleeve 15 is a hollow tube with a hollow passage forming the valve stem cavity 13 through which the valve stem 20 passes. A third gasket 171 is provided on the connection surface between the bonnet 17 and the valve body seat 16 to seal the connection surface, thereby preventing fluid leakage. The valve cover 17 and the valve body seat 16 of the embodiment are connected through a plurality of hexagon bolts 172, so that the valve cover 17 can be conveniently detached.

The valve cover 17 is provided with a through hole for the valve rod 20 to pass through, the valve rod 20 passes through the valve body 10 along the through hole, the valve cover 17 is connected with the valve rod 20 through threads, and when the valve rod 20 is rotated, the valve rod 20 can move up and down relative to the valve body 10.

The bonnet 17 includes a bonnet body 170, a packing 175, and a packing nut 177. The sealing ring 175 is arranged on the valve rod 20 and is positioned at the outlet of the valve rod 20 penetrating out of the bonnet body 170, and is used for sealing the valve body 10; the packing nut 177 is disposed on the valve stem 20 and is threadedly coupled to the bonnet body 170 to compress the fixing packing 175. The sealing ring 175 seals this place against the fluid medium flowing out through the gap between the bonnet 17 and the valve stem 20. Specifically, the valve cover 17 further comprises a gasket 173 for fixedly engaging with a sealing ring 175, a second sealing gasket 174 and a pressing sleeve 176. The gasket 173 and the second sealing gasket 174 are fitted around the lower portion of the sealing ring 175, and the pressing sleeve 176 is fitted around the upper portion of the sealing ring 175. When the valve is installed, the gasket 173 is sleeved on the valve rod 20 to be clamped on the step in the through hole of the valve cover 17, and then the second sealing gasket 174, the sealing ring 175 and the pressing sleeve 176 are sleeved in sequence; the gland nut 177 is movably connected to the bonnet body 170 through threads, and the gland nut 177 is screwed downwards until abutting against an O-ring 179 on the bonnet body 170, so that the sealing ring 175 is fixedly mounted. The compression nut 177 of this embodiment further includes a locking ring 178, and an annular groove is formed on a sidewall of the through hole of the compression nut 177 matching with the valve stem 20, and the locking ring 178 is located in the annular groove for fastening the compression nut 177 to the valve stem 20.

The manual control section 40 includes a hand wheel 41 and a hand wheel label 42. The hand wheel 41 is a circular annular structure, the hand wheel 41 is fixedly connected to the outer side end of the valve rod 20, the hand wheel 41 is rotated to drive the valve rod 20 to rotate, the force arm can be increased, and an operator can easily rotate the valve rod 20. When the hand wheel 41 is screwed to be fully opened, the device is a check valve to perform a one-way passing check function; when the hand wheel 41 is screwed to the full close, the valve is completely closed, and the stop function that both sides do not pass is achieved. The two limits of the rotation of the hand wheel are limited, so that the non-return function and the stop function of the device can be accurately switched, and the control is simpler. The hand wheel label 42 is arranged above the hand wheel 41, and the hand wheel label 42 is provided with a pointing scale, so that the rotation angle of the hand wheel 41 can be judged through the scale. The hand wheel 41 and the hand wheel label 42 are connected with the valve rod 20 through a cover nut 44 and a spring gasket 43, and the cover nut 44 sequentially penetrates through the spring gasket 43, the hand wheel label 42 and the hand wheel 41 and then is connected with the valve rod 20 to realize the fixed connection.

Shut-off valve 100 of the present embodiment also includes a thermal sleeve 50. The heat insulation sleeve 50 is arranged in the valve rod cavity 13 formed by the metal sleeve 15, and the valve rod 20 is arranged in the heat insulation sleeve 50 in a penetrating mode. The heat insulating sleeve 50 is fixed to the valve stem 20 by a circlip 60 provided on the valve stem 20, and the heat insulating sleeve 50 fills the space between the valve stem 20 and the metal sleeve 15. The stop valve 100 of this embodiment is mainly applied to the pipeline of cryogenic liquids such as liquefied natural gas, and when traditional valve setting was on cryogenic liquids pipeline, the low temperature medium can carry out the heat exchange through the valve gap of valve, leads to the low temperature medium temperature to rise. This embodiment prevents heat exchange between the cryogenic liquid and the bonnet 17 by providing a thermal sleeve 50 within the valve stem cavity 13. The heat-insulating sleeve 50 of this embodiment adopts the PTFE material, can realize the heat preservation function, can also prevent the immersion of liquid medium, has increased the heat preservation effect. It is understood that the length of the insulating sleeve 50 is increased moderately according to the insulating effect required, and the length of the metal sleeve 15 is also increased correspondingly.

Referring to fig. 2, a liquid inlet chamber 11, a liquid outlet chamber 12 and a valve rod chamber 13 are formed inside the valve body 10 and are communicated with each other. The liquid inlet cavity 11 is positioned at the bottommost part of the valve body 10, the valve rod cavity 13 is positioned above the liquid inlet cavity 11, and the valve body 10 between the liquid inlet cavity 11 and the valve rod cavity 13 is provided with a cut-off through hole 14 for communicating the liquid inlet cavity 11 with the valve rod cavity 13; the liquid outlet chamber 12 communicates with the side of the valve stem chamber 13, allowing fluid to pass through the liquid inlet chamber 11, the valve stem chamber 13 and the liquid outlet chamber 12.

With continued reference to FIG. 2, a poppet assembly 30 is disposed in the valve stem cavity 13 and is coupled to an end of the valve stem 20; the lifting assembly 30 is used to seal or open the shut-off through hole 14. The lifting assembly 30 includes a valve flap 31, an elastic member 32, and a pressing member 33. The valve flap 31 is movably connected to one end of the valve stem 20 to be movable up and down along the axis of the valve stem 20 to seal or open the shut-off through hole 14. The pressing piece 33 is fixedly connected to the valve rod 20 and is arranged opposite to the valve clack 31 at an interval; the elastic member 32 is connected between the valve flap 31 and the pressing member 33.

Specifically, the valve flap 31 is connected to the valve stem 20. The valve flap 31 is provided with a connecting hole 311 on the side facing the valve rod 20, the end of the valve rod 20 is arranged in the connecting hole 311, and the valve rod 20 can slide up and down along the connecting hole 311. The connection hole 311 is provided to guide the valve rod 20 so that the valve rod 20 does not move up and down or the valve flap does not move up and down 31 and does not move left and right to cause deviation.

In some embodiments, the lift assembly 30 further includes a coupling nut 34 and a lock washer 35 for slidably coupling the valve flap 31 to the valve stem 20. The coupling nut 34 is fitted over the valve stem 20 to be slidable up and down with respect to the valve stem 20, and a locking washer 35 is provided between the coupling nut 34 and a sidewall of the coupling hole 311 to fix the coupling nut 34 to the coupling hole 311 so that the valve flap 31 is slidable up and down with respect to the valve stem 20. This connection facilitates assembly of the valve stem 20. Particularly, in some embodiments, the bottom end of the valve rod 20 is provided with a protrusion, which can be engaged with the coupling nut 34, and when the valve rod 20 moves upward, the protrusion can drive the coupling nut 34 and further drive the valve flap 31 to move upward integrally, which can solve the problem that the valve flap 31 cannot open the shut-off through hole 14 due to corrosion, blockage, and other faults. It is understood that the valve flap 31 and the valve rod 20 may be connected by a sliding block and a sliding groove, as long as the sliding connection between the valve flap 31 and the valve rod 20 is realized.

The pressing member 33 is made of an annular rigid material, is fixedly connected to the valve rod 20 through a snap ring, and is arranged opposite to the valve clack 31 at the bottom of the pressing member at a spacing. Can move up and down along with the movement of the valve rod 20, thereby changing the distance between the valve clack 31 and the pressing piece 33. When the resilience of the elastic element 32 is weakened, the hand wheel 41 can be rotated to reduce the distance between the pressing element 33 and the valve flap 31, so that the elastic element 32 can still work normally to realize the function of stopping. And, when the pressing piece 33 further moves downwards, the pressure of the elastic piece 32 is increased, the valve flap 31 is tightly buckled and pressed on the intercepting through hole 14, the fluid in the liquid inlet cavity 11 can not push the valve flap 31 open, and the pipeline of the immersed pump system is completely cut off.

The elastic member 32 is provided in plural, and the plural elastic members 32 are each provided between the valve flap 31 and the pressing member 33 and arranged at intervals around the axis of the valve stem 20. The elastic member 32 of this embodiment is a spring, and a plurality of springs are connected between the pressing member 33 and the valve flap 31, so that the valve flap 31 is stressed more uniformly, and the sealing effect is better. When the pressing piece 33 or the valve clack 31 approaches, the compression is charged, and when the flow stopping or the flow stopping is needed, the spring provides pressing force to press the valve clack 31 on the flow stopping through hole 14 to seal the flow stopping through hole 14.

The lift assembly 30 also includes a first sealing gasket 36 for sealing. The valve flap 31 is provided with a mounting groove on a side facing the shut-off through hole 14, and a first sealing gasket 36 is disposed in the mounting groove. In this embodiment, the first sealing gasket 36 is circular, the Zhou Ce of the intercepting through-hole 14 is provided with an annular protrusion, and when the valve flap 31 moves downwards to seal the intercepting through-hole 14, the annular protrusion on the peripheral side of the intercepting through-hole 14 is pressed against the first sealing gasket 36 to form a sealing ring, so as to prevent leakage.

In this embodiment, the lifting assembly 30 further includes a bottom gasket 39 and a retaining nut 37 for securing the first sealing gasket 36 in the mounting groove of the valve flap 31. The bottom gasket 39 is arranged at the bottom of the valve clack 31, the diameter of the bottom gasket 39 is larger than the diameter of the inner ring of the first sealing gasket 36 and smaller than the diameter of the outer ring of the first sealing gasket 36, so that the edge of the bottom gasket 39 is pressed against part of the first sealing gasket 36, and the bottom gasket 39 is fixed at the bottom of the valve clack 31 through the retaining nut 37 and the flat gasket 38, and the first sealing gasket 36 is also fixed in the mounting groove of the valve clack 31. It is contemplated that the first sealing gasket 36 can be directly fixed in the mounting groove of the valve flap 31 by interference fit or adhesion.

The stop valve 100 with the check function in this embodiment has two working states, one is used as a check valve under normal operation, and performs the check function of one-way passing; the other is that when the pipeline needs to be checked, the valve is completely closed to achieve the stop function that both sides do not pass through.

(1) The function of check is performed. The hand wheel 41 rotates to the full-open limit, so that the pressing piece 33 on the valve rod 20 is located at the first position, and at this time, the elastic piece 32 is in a compressed state and has a certain pressure on the valve clack 31. When the liquid inlet cavity 11 starts to feed liquid and the pressure of the liquid is increased and is larger than the pressure generated by the elastic element 32, the liquid will push the valve clack 31 open, so that the valve clack 31 moves upwards along the axis of the valve rod 20, at the moment, the elastic element 32 is further compressed, the cut-off through hole 14 is opened, and the medium passes through in one way. When the fluid pressure in the fluid inlet cavity 11 is reduced, the elastic member 32 rebounds and presses against the valve flap 31, so that the valve flap 31 moves downwards to the closure through hole 14, the closure through hole 14 is sealed, and the check is realized. In this case, the fluid medium can only pass in one direction in the direction of the inlet chamber 11, the valve rod chamber 13 and the outlet chamber 12.

The height of the first position, i.e. the initial position of the distance between the pressing member 33 and the valve flap 31, is determined by the elastic coefficient of the elastic member 32 and the standard pressure of the fluid in the fluid inlet chamber 11. As long as the pressure in the liquid inlet chamber 11 reaches the standard value, the fluid in the liquid inlet chamber 11 can push the valve flap 31 open. When the resilience of the resilient member 32 is reduced over a long period of use, the valve stem 20 can be rotated to bring the pressing member 33 into proper proximity with the valve flap 31, and by reducing the height of the first position of the pressing member 33, the entire device can still perform a check function without leakage.

(2) Performs the cutoff function. When the system pipeline needs to be overhauled; the hand wheel 41 is rotated to the full closed limit position to move the valve stem 20 downwardly. The pressing member 33 is driven to move downwards to the second position, and the elastic member 32 is further compressed; the valve flap 31 is pressed against the intercepting through hole 14, at the moment, the valve flap 31 is tightly buckled on the intercepting through hole 14, the pressure generated by the elastic piece 32 is far greater than the pressure of the fluid in the liquid inlet cavity 11, the fluid in the liquid inlet cavity 11 cannot push the valve flap 31 open, at the moment, the fluid in the liquid inlet cavity 11 and the liquid outlet cavity 12 cannot pass through the stop valve 100, and the two directions of the pipeline are stopped. A reliable seal is formed.

The height of the second position, i.e. the distance between the pressing member 33 and the valve flap 31, is also determined by the elastic coefficient of the elastic member 32 and the internal pressure of the fluid. In some embodiments, when the elastic member 32 is completely failed, the valve stem 20 is directly rotated, so that the bottom end face of the valve stem 20 directly presses against the valve flap 31, and the shut-off through hole 14 is sealed, thereby achieving shut-off.

The embodiment can adjust the distance between the pressing piece 33 and the valve clack 31 through the pressing piece 33 fixedly connected to the valve rod 20 to control the pressure of the elastic piece 32 on the valve clack 31, so that the technical problems that the resilience force of a spring in the check valve is weakened, the check valve is not tight in sealing, the check function is weakened, and the risk of fluid backflow exists are solved, the pipeline of the LNG multi-immersed pump system can be completely stopped by continuously increasing the elasticity of the elastic piece 32, the check function is realized, and the stopping can be realized.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A stop valve with a check function is characterized by comprising:

the valve body is internally provided with a liquid inlet cavity, a liquid outlet cavity and a valve rod cavity which are communicated with each other, and the valve body is provided with a cut-off through hole for communicating the liquid inlet cavity with the valve rod cavity;

the valve rod penetrates into the valve rod cavity and can move up and down along the axis of the valve rod cavity;

the lifting assembly comprises a valve clack, an elastic piece and a pressing piece, the valve clack is positioned above the intercepting through hole, and the valve clack is movably connected to the valve rod and can move up and down relative to the valve rod so as to seal or open the intercepting through hole; the pressing piece is fixedly connected to the valve rod and arranged opposite to the valve clack at intervals, the pressing piece moves up and down along with the valve rod, and the distance between the valve clack and the pressing piece can be changed; the elastic piece is arranged between the valve clack and the pressing piece;

the pressing piece is located at the first position, the pressure of the elastic piece is smaller than the fluid pressure in the liquid inlet cavity, the fluid in the liquid inlet cavity can push the valve clack open, the valve clack moves upwards along the axis of the valve rod, and the intercepting through hole is opened; the fluid pressure of the liquid inlet cavity is weakened, the elastic piece rebounds to press the valve clack to the closure through hole, and the closure through hole is sealed to realize non-return; the pressing piece moves downwards along with the valve rod to a second position, and the pressure of the elastic piece is greater than the fluid pressure in the liquid inlet cavity; the fluid in the liquid inlet cavity can not jack the valve clack, so that the valve clack is cut off.

2. The check valve with check function of claim 1, wherein a connecting hole is formed on one side of the valve clack facing the valve rod, and the end part of the valve rod is slidably arranged in the connecting hole.

3. The check valve with check function according to claim 1, wherein said elastic member is provided in plurality, and a plurality of said elastic members are each provided between said valve flap and said pressing member and arranged at intervals around an axis of said valve stem.

4. The stop valve with the check function according to claim 1, further comprising a heat-insulating sleeve, wherein the heat-insulating sleeve is arranged in the valve stem cavity, and the valve stem is arranged in the heat-insulating sleeve in a penetrating manner.

5. The check valve of claim 1, wherein the poppet assembly further comprises a first sealing gasket, a mounting groove is formed on a side of the valve flap facing the shut-off through hole, and the first sealing gasket is disposed in the mounting groove.

6. The check valve of claim 5, wherein the lifting assembly further comprises a bottom gasket disposed at a bottom of the valve flap, the bottom gasket pressing against an inner portion of the first sealing gasket, and a retaining nut passing through the bottom gasket and fixedly coupled to the valve flap to secure the first sealing gasket in the mounting groove.

7. The stop valve with the check function according to claim 2, wherein the lifting assembly further comprises a connection nut, the connection nut is slidably sleeved on the valve rod, and the connection nut is fixedly connected with the inner side wall of the connection hole.

8. The stop valve with the check function according to claim 1, wherein the valve body comprises a detachable valve cover, the valve cover is provided with a through hole for the valve rod to pass through, and the valve rod is connected with the valve cover through threads.

9. The stop valve with the check function according to claim 8, wherein the bonnet comprises a bonnet body, a seal ring and a compression nut, the seal ring is arranged on the valve rod and is positioned at an outlet of the valve rod, which penetrates out of the bonnet body, and is used for sealing the valve body; the compression nut is arranged on the valve rod, is connected with the valve cover body through threads and is used for compressing and fixing the sealing ring.

10. The stop valve with the check function according to claim 1, further comprising a manual control part, wherein the manual control part comprises a hand wheel and a hand wheel label, and the hand wheel is arranged on the valve rod and used for controlling the valve rod to move up and down; the hand wheel sign is connected on the hand wheel, and the hand wheel sign is provided with directional scales for judging the rotation angle of the hand wheel.

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