CN216742875U - Stop valve and refrigerating system thereof - Google Patents

Abstract

The utility model relates to a refrigeration technology field especially relates to stop valve and refrigerating system thereof. A shut-off valve comprising: the valve comprises a hollow valve body, a valve seat and a valve port, wherein the valve body is at least provided with a first opening and a second opening; the valve core is at least partially arranged in the valve body and can move along the axial direction of the valve body, the valve core comprises a connecting part and a guide part which are separately arranged, the guide part is close to the valve seat relative to the connecting part, and the guide part moves along with the valve core in the axial direction and is used for opening or blocking the valve port so as to connect or disconnect a passage between the first opening and the second opening. The valve core has the advantages that the valve core can be divided into the connecting part and the guiding part to be processed respectively, the connecting part and the guiding part are combined after the processing is finished, the processing time and the cutting amount are reduced, the cost is reduced, the guiding part can be radially limited by the valve port after being inserted into the valve port, and the problem that the valve core is inclined in the process of opening and closing the valve is avoided.

Description

Stop valve and refrigerating system thereof

Technical Field

The utility model relates to a refrigeration technology field especially relates to stop valve and refrigerating system thereof.

Background

In a refrigeration system, a stop valve is used for playing an important role in cutting off and throttling a medium in a pipeline where the stop valve is located, and an opening and closing part of the stop valve is a valve core and is mainly applied to cutting off the medium in a low-temperature environment.

In the existing stop valve, the valve core has large cutting amount, long time consumption, large cutter loss and higher cost when being processed, and the valve core is easy to deflect in the process of opening and closing the valve.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a stop valve to above-mentioned technical problem, technical scheme as follows:

a shut-off valve comprising:

the valve comprises a hollow valve body, a valve seat and a valve port, wherein the valve body is at least provided with a first opening and a second opening;

the valve element comprises a connecting part and a guide part which are separately arranged, the guide part is close to the valve seat relative to the connecting part, and the guide part moves along the axial direction of the valve element and is used for opening or blocking the valve port so as to connect or disconnect a passage between the first opening and the second opening.

So set up, the connecting portion and the guide portion of case process respectively, make both combine after the processing is accomplished, reduce process time and cutting output, improve production efficiency and cost rate, reduce cost to can be radially spacing by the valve port after the guide portion inserts the valve port, avoid the problem of skew appears in the in-process valve core of ooff valve.

In one embodiment, the guiding portion is located at an end of the connecting portion close to the first opening, and is used for guiding the valve core to be inserted into the first opening so as to achieve sealing fit between the valve core and the first opening.

So set up, the lateral wall and the direct butt of first opening of boss can make first opening spacing more firm to the circumference of boss.

In one embodiment, the guide portion includes a boss that is capable of protruding into the first open valve seat, and an outer side wall of the boss abuts against an inner side wall of the valve seat when the boss is inserted into the valve seat.

So set up, the lateral wall of boss and the direct butt of the inside wall of disk seat make the sealed effect of guide portion and disk seat better, connect more firmly.

In one embodiment, the side wall of the boss is connected to the bottom wall of the boss facing the first opening by a fillet.

So set up, can avoid stress concentration, add intensity, when guide portion inserts in first opening, the guide effect of fillet structure is better, can prevent that the closed angle from forming with first opening and interfering.

In one embodiment, the guide portion includes a flange extending radially outward relative to the guide portion, the flange is provided with a circle around the circumferential extension of the guide portion, the flange is provided with a third sealing member on an end surface facing the first opening, and the third sealing member can be pressed on an end surface facing the valve core of the first opening valve seat in a sealing manner to cut off a passage between the first opening and the second opening.

So set up, the cooperation of third sealing member and first opening towards the terminal surface of case is inseparabler, has strengthened the leakproofness.

In one embodiment, an end surface of the valve seat facing the valve element is provided with an annular protrusion corresponding to the third sealing element, and when the guide portion is inserted into the first opening, the third sealing element is pressed and held on the annular protrusion in a sealing manner.

So set up, when the case inserts first opening, the bellied butt of third sealing member and annular can play the cushioning effect to strengthen sealed effect.

In one embodiment, the connecting portion and the guide portion have an overlap depth in the axial direction of the spool, and a ratio of the overlap depth a to a thickness b of the flange is between 0.3 and 1.

Due to the arrangement, the depth of the connecting part inserted into the guide part is in a proper range, so that the phenomenon that the connecting strength is insufficient due to too shallow insertion depth and the connecting part is easy to separate and slide off is avoided; the problem that the overall strength of the valve core is influenced when the guide part is inserted into the first opening to generate deviation due to too deep insertion depth is solved.

In one embodiment, a second groove is formed in one end, close to the connecting portion, of the guiding portion, the second groove is located in the center of the guiding portion, and one end of the connecting portion is arranged in the second groove, so that the guiding portion and the connecting portion are connected;

or, a second groove is formed in one end, close to the guide portion, of the connecting portion, the second groove is located in the center of the connecting portion, and one end of the guide portion is arranged in the second groove to achieve connection of the guide portion and the connecting portion.

So set up for connecting portion when rotatory, guide portion can follow the connecting portion and carry out coaxial rotation. The guide part is coaxial with the connecting part in the process of opening and closing the valve, so that the guide part can be ensured to smoothly enter or leave the first opening.

In one embodiment, one end of the connecting portion inserted into the guiding portion is provided with a chamfer or one end of the guiding portion inserted into the connecting portion is provided with a chamfer, and/or an insertion opening of the second groove is provided with a chamfer.

So set up, when the installation, the chamfer can guide connecting portion and insert the guide portion, passes through welded connection when guide portion and connecting portion, and the chamfer can make the solder more easily flow in the gap between guide portion and the connecting portion.

In one embodiment, a second groove is formed in the connecting part, one end, close to the connecting part, of the guide part is inserted into the second groove, inner threads are formed in the inner wall of the second groove, external threads are formed at one end, inserted into the second groove, of the guide part, and the connecting part is in threaded connection with the guide part;

or, be equipped with the second recess on the guide portion, connecting portion are close to the one end of guide portion inserts the second recess, the inner wall of second recess is equipped with the internal thread, connecting portion insert the one end of second recess is equipped with the external screw thread, connecting portion with guide portion threaded connection.

Or, the guide part and the connecting part are fixedly connected through welding.

So set up, threaded connection can make things convenient for the device to dismantle, and the welding then can strengthen the intensity that both connect, reduces the processing cost.

Compared with the prior art, the utility model provides a stop valve, the connecting portion and the guide portion of case process respectively, make both combine after the processing is accomplished, reduce process time and cutting output, improve production efficiency and yield, reduce cost to can be radially spacing by the valve port after guide portion inserts the valve port, avoid appearing the oblique problem at the in-process valve core of ooff valve.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of a stop valve provided by the present invention;

fig. 2 is a front view of a first embodiment of a stop valve provided by the present invention;

fig. 3 is a left side view of a first embodiment of a stop valve provided by the present invention;

fig. 4 is a front view of a first embodiment of the valve element provided by the present invention;

fig. 5 is a cross-sectional view of a first embodiment of the valve cartridge provided by the present invention;

fig. 6 is a sectional view of a second embodiment of the valve element provided by the present invention.

The symbols in the figures represent the following:

100. a stop valve; 10. a valve body; 11. a first opening; 111. an annular projection; 12. a second opening; 13. a first communication pipe; 14. a second communicating pipe; 15. an end cap; 151. a second thread segment; 16. a main body; 17. a valve seat; 171. a valve port; 20. a valve core; 21. an operation section; 211. a first thread segment; 22. a connecting portion; 23. a guide section; 231. a boss; 232. a flange; 233. a first groove; 234. a third seal member; 235. a second groove; 25. a first seal member; 26. a second seal member; 30. a valve assembly; 32. a housing; 33. a fourth seal member; 34. a connector; 35. an elastic member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, such a shut-off valve 100 is installed in a refrigeration system to achieve communication and cutoff of pipes.

The shutoff valve 100 includes a valve body 10 and a valve spool 20, and the valve body 10 is connected to the valve spool 20. The valve body 10 is hollow inside and is used for accommodating components such as a valve core 20 and the like; at least a portion of the valve spool 20 is disposed inside the valve body 10 and is movable in the axial direction of the valve body 10.

The valve body 10 is also provided with a first opening 11 and a second opening 12. In the present embodiment, when the stop valve 100 is installed vertically as shown in fig. 1 (when the terms of orientation such as up, down, left, and right are referred to, the stop valve 100 is default to the vertically installed state, and will not be described below), the first opening 11 and the second opening 12 are opened at the lower side and the right side of the valve body 10. One side of the first opening 11, which is far away from the valve body 10, is connected with a first communication pipe 13, and the first opening 11 is communicated with the outside through the first communication pipe 13; one side of the second opening 12 far away from the valve body 10 is connected with a second communicating pipe 14, and the second opening 12 is communicated with the outside through the second communicating pipe 14. The first communicating pipe 13 and the second communicating pipe 14 respectively serve as an inlet or an outlet of the medium. When the first communication pipe 13 is used as a medium inlet, the medium enters the stop valve 100 from the first communication pipe 13 and enters the valve body 10 through the first opening 11, and if the stop valve 100 is in an open state, the medium passes through the second opening 12 and flows out of the stop valve 100 through the second communication pipe 14; vice versa, the medium can also enter the valve body 10 from the second connection pipe 14 via the second opening 12 and then exit the shut-off valve 100 via the first opening 11 and the first connection pipe 13.

Alternatively, the positions of the first opening 11 and the second opening 12 are not limited to being opened on the lower side and the right side of the valve body 10 in the present embodiment. In other embodiments, the first opening 11 and the second opening 12 may be disposed on the left and right sides, the upper and lower sides, and the like of the valve body 10, as long as the communication or the blocking between the two valve ports can be achieved by the axial movement of the valve spool 20.

A valve seat 17 is disposed in the valve body 10, a valve port 171 is opened on the valve seat 17, and the valve port 171 is communicated with the first opening 11 and coaxially disposed. When the valve body 20 is inserted into the valve port 171, the first opening 11 and the second opening 12 are blocked.

In this embodiment, the valve seat 17 and the valve body 10 are separately provided and assembled after being processed respectively, so as to reduce the cutting amount and the processing difficulty. In other embodiments, the valve seat 17 may be provided integrally with the valve body 10.

The valve body 10 further comprises a main body 16 and an end cap 15, the main body 16 being located on a side of the valve body 10 remote from the first opening 11, being arranged opposite the first opening 11 and being coaxial with the first opening 11 in this embodiment. The body 16 is used to position the valve element 20 such that the valve element 20 moves axially along the body 16 to effect a transition between the open and closed states of the stop valve 100. The end cap 15 is located at the topmost end of the main body 16, and cooperates with the valve core 20 to seal the valve body 10, so as to prevent impurities such as external dust and powder from entering the interior of the valve body 10, affecting the sealing performance of the on-off valve of the stop valve 100 and the purity of media entering the valve body 10, and preventing affecting the implementation of other related functions of the stop valve 100.

Alternatively, the end cap 15 may be provided inside the main body 16, that is, the outer peripheral side of the end cap 15 may abut against the inner peripheral side of the main body 16, and the inner peripheral side of the end cap 15 may abut against the outer peripheral side of the valve element 20, and thus the end cap 15 and the valve element 20 may also serve to seal the valve element 10. The position of the end cap 15 is not limited to the solution described in this embodiment, and only needs to be able to achieve the above function.

The valve body 20 includes an operation portion 21, a connection portion 22, and a guide portion 23. One end of the operation part 21 is connected with the connecting part 22, and the other end extends out of the end cover 15; the connecting portion 22 is located between the operation portion 21 and the guide portion 23, and connects the operation portion 21 and the guide portion 23; the guide portion 23 is connected to an end of the connecting portion 22 away from the operating portion 21, and moves axially with the operating portion 21 and the connecting portion 22. The connecting portion 22 and the guide portion 23 are separately provided and processed to reduce the processing time and the amount of cutting, thereby reducing the cost.

In the present embodiment, the operation portion 21 protrudes from the upper end surface of the end cap 15, and is easy to machine and disassemble. The operation part 21 is provided with a hollow structure with an opening at the upper end, and a plurality of planes are uniformly distributed on the inner surface of the operation part 21 at intervals, so that the operation part can adapt to tools such as a hexagon socket wrench and the like. In other embodiments, the planes of the inner surface of the operation portion 21 may be arranged to be unevenly distributed to adapt to irregular wrenches.

The connecting portion 22 is located between the operation portion 21 and the guide portion 23, and is driven by the operation portion 21 to rotate in synchronization with the operation portion 21. The outer peripheral side of the operating portion 21 has a first threaded section 211, and the inner surface of the valve body 10 is provided with a second threaded section 151 that mates with the first threaded section 211. In the working process, the operation part 21 is operated and rotated by an external machine or a tool, so that the first thread section 211 is driven to rotate in the circumferential direction, the first thread section 211 is matched with the second thread section 151, the operation part 21 is driven to perform axial lifting motion, the operation part 21 drives the connecting part 22 connected with the operation part, the connecting part 22 drives the guide part 23 connected with the connecting part, and the axial motion of the valve core 20 is finally realized.

Preferably, the second thread segments 151 may also be provided on an inner surface of the end cap 15, the second thread segments 151 on an inner circumferential side of the end cap 15 cooperating with the first thread segments 211 on an outer circumferential side of the operating portion 21 to axially move the connecting portions 22.

The connecting portion 22 is connected to one end of the operating portion 21 facing the first opening 11, and circumferentially abuts against the inner wall of the main body 16, so that the valve body 20 can move axially along the inner wall of the main body 16. The diameter of the connecting part 22 is larger than that of the operating part 21, so that a step is formed between the connecting part 22 and the operating part 21, a first sealing element 25 is arranged on the step, and the first sealing element 25 can abut against one side, close to the connecting part 22, of the end cover 15. When the valve core 20 moves to the extreme position towards the end cover 15, namely the first sealing member 25 abuts against the end cover 15, the first sealing member 25 can play a role of buffering and enhance the sealing performance between the two.

A second sealing member 26 is further provided at one end of the connecting portion 22 close to the operating portion 21, the second sealing member 26 circumferentially surrounds the outer circumferential side of the connecting portion 22, and the outer circumferential side of the second sealing member 26 circumferentially abuts against the inner wall of the main body 16, thereby sealing the valve body 10 so that the medium does not leak during the circulation of the medium between the first opening 11 and the second opening 12. In other embodiments, the second seal 26 may be replaced with a gasket or the like that also functions as a seal.

The guide portion 23 is located at an end of the connecting portion 22 close to the first opening 11, and is used for guiding the valve element 20 to be inserted into the valve seat 17, so as to achieve sealing fit between the valve element 20 and the valve port 171.

The guide portion 23 includes a boss 231 and a flange 232, the boss 231 is disposed on one side of the flange 232 close to the first opening 11 and can extend into the valve port 171, the flange 232 extends radially outward relative to the boss 231 to form a circle of the flange 232 extending around the circumference of the boss 231, and the flange 232 can axially limit the position of the valve element 20.

Specifically, the side of the boss 231 away from the connecting portion 22 faces the first opening 11, when the shutoff valve 100 is in the closed state, the boss 231 can extend into the valve port 171, so that the axial movement of the valve element 20 is guided, and the boss 231 is circumferentially limited by the valve port 171, which increases the stability of the shutoff valve 100 in the closed state.

Further, the sidewall of the boss 231 is connected with the bottom wall of the boss 231 facing the first opening 11 through a fillet, so that the stress concentration can be avoided, the strength can be increased, and when the guide portion 23 is inserted into the valve port 171, the guiding effect of the fillet structure is better.

Alternatively, the boss 231 may be disposed to extend into the valve port 171, and then an outer circumferential side of the boss 231 may abut against an inner wall of the valve port 171, so as to enhance a limiting effect on the boss 231.

The flange 232 is provided with a first groove 233 on the end surface facing the valve seat 17, the first groove 233 is circumferentially arranged around the boss 231, a third sealing member 234 is arranged in the first groove 233, the third sealing member 234 is embedded in the first groove 233, and in the valve closing state, the third sealing member 234 is sealably pressed on the end surface facing the valve core 20 of the valve seat 17 to cut off the passage between the first opening 11 and the second opening 12.

Preferably, the connecting portion 22 and the guide portion 23 have an overlap depth in the axial direction of the spool 20, and a ratio of the overlap depth a to the thickness b of the flange 232 is between 0.3 and 0.1. Due to the arrangement, the depth of the connecting part 22 inserted into the guide part 23 is in a proper range, so that the phenomenon that the connecting strength is insufficient due to too shallow insertion depth and the connecting part is easy to separate and slide is avoided; the problem that the overall strength of the valve body 20 is affected when the guide portion 23 is inserted into the first opening 11 and is displaced due to too deep insertion depth is also avoided.

An annular protrusion 111 corresponding to the third sealing member 234 is provided on an end surface of the first opening 11 facing the valve core 20, and when the shutoff valve 100 is closed, the third sealing member 234 cooperates with the annular protrusion 111 to seal the first opening 11.

Preferably, the annular protrusion 111 is shaped as a smooth circular arc on the side facing the third seal 234, so as to avoid damage to the third seal 234 and ensure the sealing performance between the annular protrusion 111 and the third seal 234.

Alternatively, in other embodiments, the shape of the side of the annular protrusion 111 facing the third seal member 234 may be a rectangle, a triangle, or the like, which may ensure the sealing performance.

One end of the guiding portion 23 close to the connecting portion 22 is provided with a second groove 235, the second groove 235 is located at the central position of the guiding portion 23, and one end of the connecting portion 22 is arranged in the second groove 235, so that the connection between the guiding portion 23 and the connecting portion 22 is realized.

In other embodiments, a second groove 235 is formed at one end of the connecting portion 22 close to the guiding portion 23, the second groove 235 is located at a central position of the connecting portion 22, and one end of the guiding portion is disposed in the second groove 235, so as to connect the guiding portion 23 and the connecting portion 22.

Referring to fig. 4 and 5, in the first embodiment, the connecting portion 22 and the guiding portion 23 are fixedly connected by welding. Preferably, the second groove 235 is provided on the guide portion 23, and one end of the connection portion 22 is inserted into the second groove 235, or the second groove 235 is provided on the connection portion 22, and one end of the guide portion 23 is inserted into the second groove 235, and welding is performed between the connection portion 22 and the guide portion 23 to fix both.

Referring to fig. 6, in the second embodiment, the connecting portion 22 and the guiding portion 23 are connected by a screw, preferably, an external thread is disposed at one end of the connecting portion 22 close to the guiding portion 23, an internal thread is disposed in the second groove 235 of the guiding portion 23, and the external thread of the connecting portion 22 and the internal thread of the second groove 235 are matched with each other, so that the connecting portion 22 and the guiding portion 23 perform a limiting function.

Alternatively, the second groove 235 may also be opened on the connecting portion 22, an inner wall of the second groove 235 is provided with an internal thread, a section of the guiding portion 23 inserted into the second groove 235 is provided with an external thread, and the connecting portion 22 and the guiding portion 23 are connected through a thread.

Specifically, one end of the connecting portion 22 inserted into the guide portion 23 is chamfered, or the second groove 235 is chamfered with a notch of the flange 232 flush with the end surface of the connecting portion 22, or one end of the second groove 235 inserted into the guide portion 23 is chamfered, while the notch of the flange 232 flush with the end surface of the connecting portion 22 is also chamfered. With this arrangement, when mounting, the chamfer can guide the insertion of the connection portion 22 into the guide portion 23, and when the guide portion 23 and the connection portion 22 are connected by soldering, the chamfer can make the solder more easily flow into the gap between the guide portion 23 and the connection portion 22. When the stop valve 100 is closed, the valve core 20 moves toward the first opening 11, and finally the third sealing member 234 abuts against the annular protrusion 111 on the valve seat 17 to isolate the first opening 11, the first communication pipe 13 and the interior of the valve body 10. Preferably, the third sealing member 234 is made of red copper to ensure the sealing performance between the third sealing member 234 and the valve seat 17. In other embodiments, the third sealing element 234 may be made of hard plastic or the like that also ensures sealing performance.

In addition, the shut-off valve 100 includes a valve assembly 30, the valve assembly 30 being connected to the body 16. In this embodiment, the valve assembly 30 is disposed opposite the second opening 12 as a charge inlet or a discharge outlet for replenishing or discharging the entire refrigerant system with medium. In other embodiments, the axis of the valve assembly 30 may be perpendicular to the axis of the second opening 12, and the valve assembly 30 may be located elsewhere on the body 16.

The valve assembly 30 comprises a connecting body 34, which connecting body 34 is connected to the main body 16, which connecting body 34 serves as a passage for the medium into the valve body 10.

The valve assembly 30 also includes a valve core, a cover 32, and a fourth seal 33. The valve core is arranged in the connecting body 34, so that the interior of the main body 16 can be communicated with or separated from the interior of the connecting body 34, and the cover shell 32 is sleeved on the outer peripheral side of the connecting body 34 and used for protecting the valve core and preventing external impurities from entering; a fourth seal 33 is located between the housing 32 and the connecting body 34 and cooperates with the housing 32 to seal the connecting body 34.

Specifically, one end of the valve core is provided with an elastic member 35. When the valve core is not subjected to the external pressure, the valve core is kept in a closed state, and at the moment, the connecting body 34 keeps sealed and blocks the inside of the valve body 10 from the outside. When the valve core is pressurized, the valve core presses the elastic piece 35 and moves towards the direction close to the main body 16, so that the blockage is removed, the inner part of the main body 16 is communicated with the inner part of the connecting body 34, and a medium can flow into the valve body 10 or flow out of the valve body 10. The elastic member 35 is used for resetting the valve core.

The utility model also provides a refrigerating system, including foretell stop valve 100, stop valve 100 is installed in refrigerating system's medium route to the truncation and the circulation of control route, and be used for supplementing the medium to refrigerating system.

In the operation process of the stop valve 100 of the present embodiment, when the stop valve 100 needs to be closed, the operating portion 21 at the top of the stop valve 100 is screwed, the operating portion 21 and the connecting portion 22 rotate synchronously, and the connecting portion 22 drives the valve element 20 to move axially relative to the end cap 15 through the cooperation of the first threaded portion 211 and the second threaded portion 151, so that the guiding portion 23 at the bottom end of the valve element 20 is inserted into the valve port 171, and the third sealing member 234 abuts against the valve seat 17 to seal the first communication pipe 13, thereby achieving the cut-off between the first communication pipe 13 and the second communication pipe 14.

Compared with the prior art, the utility model discloses a case 20 can divide connecting portion 22 and guide portion 23 to process respectively, makes both combine after the processing is accomplished, reduces process time and cutting output, reduce cost to guide portion 23 can be radially spacing by valve port 171 after inserting valve port 171, avoids appearing the problem of incline at the in-process case 20 of ooff valve.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A shut-off valve, comprising:

the valve comprises a hollow valve body (10), wherein at least a first opening (11) and a second opening (12) are formed in the valve body (10), a valve seat (17) is arranged in the valve body (10), a valve port (171) is arranged on the valve seat (17), and the valve port (171) is communicated with the first opening (11);

the valve core (20) is arranged in the valve body (10) at least partially and can move along the axial direction of the valve body (10), the valve core (20) comprises a connecting part (22) and a guide part (23) which are arranged in a split mode, the guide part (23) is close to the valve seat (17) relative to the connecting part (22), and the guide part (23) moves along with the valve core (20) in the axial direction and is used for opening or blocking the valve port (171) so as to enable a passage between the first opening (11) and the second opening (12) to be communicated or disconnected.

2. A shut-off valve according to claim 1, wherein the guide portion (23) is located at an end of the connecting portion (22) adjacent to the valve port (171) for guiding the valve cartridge (20) to be inserted into the valve port (171) to achieve the sealing engagement of the valve cartridge (20) and the valve port (171).

3. A shut-off valve according to claim 2, wherein the guide portion (23) comprises a boss (231) that is adapted to project into the valve seat (17), an outer side wall of the boss (231) abutting an inner side wall of the valve seat (17) when the boss (231) is inserted into the valve port (171).

4. A stop valve according to claim 3, wherein the side wall of the boss (231) is connected with the bottom wall of the boss (231) facing the first opening (11) by a fillet.

5. A shut-off valve according to claim 2, characterised in that the guide (23) comprises a flange (232) extending radially outwards relative to the guide (23), the flange (232) being arranged one turn around the circumferential extension of the guide (23), the flange (232) being provided with a third seal (234) on the end face facing the first opening (11), the third seal (234) being sealingly pressable against the end face of the valve seat (17) facing the valve spool (20) to close off the passage between the first opening (11) and the second opening (12).

6. A shut-off valve according to claim 5, characterised in that the end face of the valve seat (17) facing the valve spool (20) is provided with an annular projection (111) corresponding to the third seal (234), the third seal (234) being sealingly pressed against the annular projection (111) when the guide portion (23) is inserted in the first opening (11).

7. A stop valve according to claim 5, characterized in that the connecting portion (22) and the guide portion (23) have an overlap depth in the axial direction of the spool (20), the ratio of the overlap depth a to the thickness b of the flange (232) being between 0.3 and 1.

8. The stop valve according to claim 1, characterized in that one end of the guide part (23) close to the connecting part (22) is provided with a second groove (235), the second groove (235) is positioned at the center of the guide part (23), one end of the connecting part (22) is arranged in the second groove (235) to realize the connection of the guide part (23) and the connecting part (22);

or, a second groove (235) is formed in one end, close to the guide portion (23), of the connecting portion (22), the second groove (235) is located in the center of the connecting portion (22), and one end of the guide portion (23) is arranged in the second groove (235) to achieve connection between the guide portion (23) and the connecting portion (22).

9. A stop valve according to claim 8, characterized in that the end of the connecting portion (22) inserted into the guiding portion (23) is chamfered, or the end of the guiding portion (23) inserted into the connecting portion (22) is chamfered, and/or the insertion opening of the second recess (235) is chamfered.

10. The stop valve according to claim 1, characterized in that a second groove (235) is arranged on the connecting part (22), one end of the guiding part (23) close to the connecting part (22) is inserted into the second groove (235), the inner wall of the second groove (235) is provided with internal threads, one end of the guiding part (23) inserted into the second groove (235) is provided with external threads, and the connecting part (22) is in threaded connection with the guiding part (23);

or a second groove (235) is formed in the guide portion (23), one end, close to the guide portion (23), of the connecting portion (22) is inserted into the second groove (235), internal threads are formed in the inner wall of the second groove (235), external threads are formed in one end, inserted into the second groove (235), of the connecting portion (22), and the connecting portion (22) is in threaded connection with the guide portion (23);

or the guide part (23) and the connecting part (22) are fixedly connected through welding.

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