Control valve

Abstract

The invention relates to the field of adjustment, in particular to a control valve with an accurate matching position of a valve core part and a valve port part, a guide part is positioned at the end part, close to the valve port part, of the valve core part, and in the whole process of opening and closing the control valve, at least part of the guide part is positioned in a fluid channel; at least part of the guide part abuts against at least part of the side wall of the channel, that is, in the whole process of opening and closing the control valve, the side wall of the channel limits the valve element part, the impact influence of fluid from the peripheral side of the valve element part on the valve element part is reduced, and when the control valve is closed, the matching position of the valve element part and the valve port part is accurate.

Description

[Technical field]

[0001] The invention relates to the field of fluid regulation, and in particular to a control valve. [Background technology]

[0002] Control valves are mostly used in the field of regulation. Fig.14 The control valve comprises a first pipeline 1', a second pipeline 2', a valve core 3' and a valve port 4'. The valve core 3' and the valve port 4' cooperate with each other to realize the on-off connection between the first pipeline 1' and the second pipeline 2'. During the process of switching the control valve, the valve core 3' moves toward the valve port 4' until the valve core 3' and the valve port 4' abut against each other, thereby closing the control valve; the valve core 3' moves in a direction away from the valve port 4', thereby opening the control valve; during the movement of the valve core 3', the valve core 3' is impacted by the fluid from the side surrounding the valve core, causing the position of the valve core 3' to shift. During the process of closing the control valve, there is a risk of inaccurate cooperation between the valve core 3' and the valve port 4', resulting in fluid leakage or damage due to collision. [Summary of the invention]

[0003] The technical problem solved by the present invention is to provide a control valve with accurate matching between the valve core part and the valve port part;

[0004] A control valve, the control valve includes a valve seat and a valve core part, the valve seat has a valve mouth part, the control valve includes a first cavity, at least part of the valve core part is located in the first cavity, the valve core part includes a guide part, the guide part is located at the end of the valve core part close to the valve mouth part, the valve mouth part includes a fluid channel, the valve mouth part includes a channel side wall corresponding to at least part of the fluid channel, in the whole process of opening and closing the valve, at least part of the guide part is located in the fluid channel, and at least part of the guide part abuts against at least part of the channel side wall.

[0005] Such a control valve has a guide portion located at the end of the valve core portion near the valve mouth portion. During the entire process of opening and closing the valve, at least part of the guide portion is located in the fluid channel, and at least part of the guide portion abuts against at least part of the channel side wall. That is, during the entire process of opening and closing the control valve, the channel side wall limits the valve core portion, reducing the impact of the fluid from the peripheral side of the valve core portion on the valve core portion, so that when the control valve is closed, the valve core portion and the valve mouth portion are accurately positioned.

Brief Description of the Drawings

[0006] Figure 1 is a cross-sectional view of a control valve of an embodiment in which the guide body portion and the channel side wall abut against each other;

[0007] Figure 2 It is a schematic diagram of a valve core portion of an embodiment in which the guide body portion and the channel side wall abut against each other;

[0008] Figure 3 is a cross-sectional view of a control valve in another embodiment in which the guide body portion and the channel side wall abut against each other;

[0009] Figure 4 It is a schematic diagram of a valve core portion of another embodiment in which the guide body portion and the channel side wall abut against each other;

[0010] Figure 5 is a cross-sectional view of a control valve of an embodiment in which the guide body portion and the channel side wall abut against each other;

[0011] Figure 6 is a cross-sectional view of a control valve of an embodiment in which the guide body portion and the channel side wall abut against each other;

[0012] Figure 7 It is a schematic diagram of a valve core portion of an embodiment in which the guide body portion and the channel side wall abut against each other;

[0013] Figure 8 is a cross-sectional view of a control valve in another embodiment in which the guide body portion and the channel side wall abut against each other;

[0014] Fig. 9 It is a schematic diagram of a valve core portion of another embodiment in which the guide body portion and the channel side wall abut against each other;

[0015] Fig.10 is a cross-sectional view of a control valve in a second state in which the first protrusion abuts against the channel side wall;

[0016] Fig.11 is a cross-sectional view of a first state of a control valve of an embodiment in which the first protrusion abuts against the side wall of the channel;

[0017] Fig.12 The guide portion includes a first protrusion, and a schematic diagram of a valve core portion in one embodiment;

[0018] Fig.13 The guide portion includes a first protrusion, and a cross-sectional view of the valve core portion of an embodiment;

[0019] Fig.14 2 is a cross-sectional view of a control valve of the background art.

[0020] Reference numerals:

[0021] Valve seat 1, valve port 11, fluid channel 111, channel side wall 112;

[0022] Valve core part 2, valve core body part 21, third matching part 213, valve core outer wall 212, guide part 22, guide body part 221, first protruding part 222, guide rib 223, guide outer wall 225, conduction port 23, hole 231, notch 232, first matching part 211, second matching part 224, second recessed part 24, second protruding part 25, groove part 6, first recessed part 5;

[0023] First pipeline 3, second pipeline 4;

[0024] First cavity 100, second cavity 200, first state 400, second state 300;

[0025] A first pipeline 1', a second pipeline 2', a valve core 3', and a valve port 4'. [Specific implementation method]

[0026] The technical solution of the specific implementation is described below in conjunction with the accompanying drawings:

[0027] refer to Figure 1-Figure 14 A control valve includes a valve seat 1 and a valve core part 2, the valve seat 1 has a valve mouth part 11, at least part of the valve core part 2 cooperates with at least part of the valve mouth part 11 to realize closing or opening of the control valve; specifically, the valve core part 2 has a valve core body part 21, the valve mouth part 11 includes a fluid channel 111, the control valve includes a first cavity 100 and a second cavity 200, the control valve also includes a first pipe and a second pipe, the first cavity 100 is connected to the inner cavity corresponding to the first pipe, the second cavity 200 is connected to the inner cavity corresponding to the second pipe, and the fluid channel 111 and the second cavity 200 are connected. Connected, at least part of the valve core part 2 is located in the first cavity 100; defined, a first state 400 and a second state 300, in the first state 400, the control valve is in an open valve state, and in the second state 300, the control valve is in a closed valve state; that is, in the second state, at least part of the valve core body part 21 abuts against the wall part corresponding to the valve mouth part 11, the control valve is in a closed state, and the first pipeline 3 and the second pipeline 4 are in a disconnected state; when the control valve is in the first state, the control valve is in an open valve state, that is, the first pipeline 3 and the second pipeline 4 are in a connected state.

[0028] More specifically, the valve core portion 2 includes a guide portion 22, which is located at the end of the valve core portion 2 close to the valve mouth portion 11, that is, the guide portion 22 extends from one end of the valve core body portion 21 close to the valve mouth portion 11 along the extension direction of the fluid channel 111; the valve mouth portion 11 includes a channel side wall 112 corresponding to at least a portion of the fluid channel 111, and during the entire process of controlling the valve to open or close, at least a portion of the guide portion 22 is located in the fluid channel 111, and at least a portion of the guide portion 22 abuts against at least a portion of the channel side wall 112.

[0029] Such a control valve has a guide portion 22 located at the end of the valve core portion 2 close to the valve mouth portion 11. During the entire process of opening and closing the control valve, at least a portion of the guide portion 22 is located in the fluid channel 111, and at least a portion of the guide portion 22 abuts against at least a portion of the channel side wall 112. That is, during the entire process of opening and closing the control valve, the channel side wall 112 limits the valve core portion 2, thereby reducing the impact of the fluid from the peripheral side of the valve core portion 2 on the valve core portion 2, so that when the control valve is closed, the valve core portion 2 and the valve mouth portion 11 are accurately positioned.

[0030] In one embodiment, reference Figure 1-Figure 5 The valve core part 2 includes a valve core body part 21, and the guide part 22 has a guide body part 221. The guide body part 221 extends from one end of the valve core body part 21 close to the valve mouth part 11 along the extension direction of the fluid channel 111. At least part of the guide body part 221 is located in the fluid channel 111. The control valve has a conducting port 23, and the conducting port 23 is located between the guide body part 221 and the channel side wall 112, or the conducting port 23 is located at the wall corresponding to the guide body part 221. In this way, when the control valve is in the first state, the first chamber 100 and the second chamber 200 can be connected.

[0031] Specifically, the guide body 221 is or is approximately annular, and the guide body 221 has a guide outer wall 225, at least part of which is in contact with the channel side wall 112, and the control valve has a conducting port 23, and the conducting port 23 is located at the wall corresponding to the guide body 221, and the control valve has a first state 400. In the first state 400, the conducting port 23 connects the first cavity and the second cavity, so that at least part of the guide body 221 is located in the fluid channel 111, and at least part of the guide body 221 is in contact with at least part of the channel side wall 112, that is, in the whole process of opening and closing the control valve, the channel side wall 112 limits the valve core part 2, reduces the impact of the fluid from the peripheral side of the valve core part 2 on the valve core part 2, so that when the control valve is closed, the valve core part 2 and the valve port part 11 are accurately matched.

[0032] The control valve has a conducting port 23, and the conducting port 23 is located at the wall corresponding to the guide main body 221. The control valve has a first state 400. In the first state 400, the conducting port 23 conducts the first cavity and the second cavity. Thus, when the control valve is in the first state 400, conduction between the first cavity and the second cavity is achieved.

[0033] It should be noted that: of course, the position and structure of the conducting opening 23 can be designed differently, for example, Figure 3 and Figure 4 , the conducting port 23 is a hole 231; in example, reference Figure 1 and Figure 2 , the conducting port 23 is a notch 232 ; the conducting portion 23 may be a plurality of holes 231 or notches 232 , which are arranged in a circumferential array on the valve core portion 2 .

[0034] Specifically, refer to Figure 3 , the conduction port 23 is a hole 231, when the valve core portion 2 moves to the maximum position in the direction away from the valve port portion 11, the conduction port 23 is completely located in the first chamber, achieving maximum fluid flow and higher conduction efficiency; as other embodiments, refer to Figure 5When the valve core portion 2 moves to the maximum position in the direction away from the valve mouth portion 11, the conduction port 23 is at least partially located in the first cavity, and the conduction port 23 is at least partially located in the fluid channel 111, that is, when the valve core portion 2 moves to the maximum position in the direction away from the valve mouth portion 11, at least part of the conduction port 23 is blocked by the fluid side wall. Although the communication between the first cavity 100 and the second cavity 200 can be achieved, the utilization rate of the conduction port 23 is reduced, and the conduction efficiency is reduced.

[0035] Of course, reference Figure 1-Figure 4 The valve core body 21 has a valve core outer wall 212, and the outer dimensions of the valve core outer wall 212 are adapted to the dimensions of the channel side wall 112. Specifically, the valve core outer wall 212 coincides with the corresponding surface, and the valve core outer wall 212 and the channel side wall 112 abut against each other. In this way, the valve mouth portion 11 is sealed when the control valve is in the second state 300, that is, when the control valve is closed.

[0036] In one embodiment, reference Figure 6-Figure 9 The valve core part 2 includes a valve core body part 21, and the guide part 22 has a guide body part 221. The guide body part 221 extends from one end of the valve core body part 21 close to the valve mouth part 11 along the extension direction of the fluid channel 111. At least part of the guide body part 221 is located in the fluid channel 111. The control valve has a conducting port 23, and the conducting port 23 is located between the guide body part 221 and the channel side wall 112, or the conducting port 23 is located at the wall corresponding to the guide body part 221. In this way, when the control valve is in the first state, the first chamber 100 and the second chamber 200 can be connected.

[0037] Specifically, the guide main body 221 is or is approximately annular, and has a guide outer wall 225, at least part of which abuts against the channel side wall 112, that is, in the entire process of opening and closing the control valve, the channel side wall 112 limits the valve core part 2, reducing the impact of the fluid from the peripheral side of the valve core part 2 on the valve core part 2, so that when the control valve is closed, the valve core part 2 and the valve mouth part 11 are accurately positioned.

[0038] More specifically, refer to Figure 7 and Fig. 9 The control valve has a first recessed portion 5, which is located at least one of the channel side wall 112 and the guide body portion 221. The control valve has a conducting port 23, which is located between the guide body portion 221 and the channel side wall 112. The control valve has a first state 400. In the first state 400, the conducting port 23 connects the first cavity 100 and the second cavity 200, that is, there is a gap between the valve core body portion 21 and the guide body portion 221, that is, the conducting port 23. In this way, when the control valve is in the first state 400, the conduction between the first cavity and the second cavity is achieved.

[0039] More specifically, the first recessed portion 5 is located in the guide main body portion 221, the valve core body portion 21 has a third matching portion 213, the third matching portion 213 is located at the end of the valve core body portion 21 close to the valve mouth portion 11, and the guide portion 22 extends from the third matching portion 213 toward the direction close to the valve mouth portion 11. In the second state 300, the third matching portion 213 and the valve mouth portion 11 are at least partially abutted; that is, the first recessed portion 5 is located downstream of the third matching portion 213. When the control valve switches from the first state 400 to the second state 300, that is, in the process of closing the valve, the first recessed portion 5 is first completely located in the fluid channel 111, and then the third matching portion 213 and the valve mouth portion 11 are abutted, so that the first cavity 100 and the second cavity 200 are disconnected.

[0040] Of course, when the control valve is in the second state 300, that is, when the control valve is closed, the sealing method of the valve mouth portion 11 can be different, for example, refer to Figure 6 The valve core body 21 has a valve core outer wall 212, and the outer dimensions of the valve core outer wall 212 are adapted to the dimensions of the channel side wall 112. More specifically, the valve core outer wall 212 and the corresponding surface coincide with each other, and the valve core outer wall 212 and the channel side wall 112 abut against each other. In this way, the valve port 11 is sealed when the control valve is in the second state 300, that is, when the control valve is closed. For another example, referring to Fig. 9 In the second state 300, the third matching portion 213 and the valve mouth portion 11 are wedge-matched. As a result, when the control valve is closed, the abutment between the third matching portion 213 and the valve mouth portion 11 changes the direction of the impact force of the valve core portion 2 on the valve mouth portion 11, which can reduce the impact of the valve core portion 2 on the valve mouth portion 11; at the same time, the valve mouth portion 11 guides the valve core portion 2, has better centering performance, and can reduce the impact of the fluid from the peripheral side of the valve core portion 2 on the valve core portion 2, so that when the control valve is closed, the valve core portion 22 and the valve mouth portion 11 are accurately matched.

[0041] In one embodiment, reference Figure 10-13 The valve core portion 2 includes a valve core body portion 21, and the guide portion 22 has a guide body portion 221. The guide body portion 221 extends from one end of the valve core body portion 21 close to the valve mouth portion 11 along the extension direction of the fluid channel 111, and at least a portion of the guide body portion 221 is located in the fluid channel 111.

[0042] Specifically, the guide portion 22 further includes a first protrusion 222 , which protrudes from the guided main body 221 toward the outer periphery of the guide main body 221 , and at least a portion of the first protrusion 222 abuts against at least a portion of the channel side wall 112 .

[0043] Such a control valve protrudes from the guided main body 221 toward the outer peripheral side of the guiding main body 221 through the first protrusion 222, at least part of the first protrusion 222 is located in the fluid channel 111, and at least part of the first protrusion 222 abuts against at least part of the channel side wall 112. During the entire process of opening and closing the control valve, at least part of the first protrusion 222 is located in the fluid channel 111, and at least part of the first protrusion 222 abuts against at least part of the channel side wall 112. That is, during the entire process of opening and closing the control valve, the channel side wall 112 limits the valve core part 2, reduces the impact of the fluid from the peripheral side of the valve core part 2 on the valve core part 2, so that when the control valve is closed, the valve core part 2 and the valve mouth part 11 are accurately positioned. In addition, compared with the abutment between the wall portion corresponding to the entire guide body portion 221 and the channel side wall 112, in this embodiment, the contact area between at least a portion of the first protrusion 222 and at least a portion of the channel side wall 112 is smaller, reducing the sliding friction during the valve closing process.

[0044] Specifically, refer to Fig.12 and Fig.13 The valve core portion 2 includes a valve core body portion 21, a guide body portion 221 extending from one end of the valve core body portion 21 close to the valve mouth portion 11 along the extension direction of the fluid channel 111, the first protrusion 222 is a guide rib 223, and the extension direction of the guide rib 223 is consistent with the extension direction of the guide body portion 221; the width of at least part of the guide rib 223 gradually decreases along the direction close to the second cavity 200 and / or the height of at least part of the guide rib 223 gradually decreases along the direction close to the second cavity 200.

[0045] In such a control valve, the guide body portion 221 extends from one end of the valve core body portion 21 close to the valve mouth portion 11 along the extension direction of the fluid channel 111, and the first protrusion 222 is a guide rib 223, and the extension direction of the guide rib 223 is consistent with the extension direction of the guide body portion 221. As a result, in this embodiment, at least part of the guide rib 223 is located in the fluid channel 111 during at least part of the control valve closing process, and at least part of the guide rib 223 abuts against at least part of the channel side wall 112, and the contact area is reduced compared to the abutment between the corresponding wall portion of the entire guide body portion 221 and the channel side wall 112; and the contact area between the guide rib 223 and the channel side wall 112 is reduced by gradually reducing the width of at least part of the guide rib 223 in the direction close to the second cavity 200 and / or gradually reducing the height of at least part of the guide rib 223 in the direction close to the second cavity 200, so as to reduce the sliding friction between the guide portion 22 and the channel side wall 112 during the valve closing process.

[0046] Specifically, the first protrusion may be a plurality of guide ribs 223 , and the plurality of guide ribs 223 are circumferentially arrayed on the circumferential side of the guide body portion 221 .

[0047] In this embodiment, in the first state 400, the conducting port 23 connects the first cavity 100 and the second cavity 200, that is, there is a gap between the valve core body 21 and the guide body 221, namely, the conducting port 23. In this way, when the control valve is in the first state 400, the communication between the first cavity 100 and the second cavity 200 is achieved; of course, the conducting port 23 can also be simultaneously added to the guide body 221 to increase the flow rate, which will not be repeated here.

[0048] Of course, there can be different ways for the material and molding of the guide portion 22:

[0049] For example, the valve core body 21 can be made of metal, and the guide part 22 can be made of plastic. The valve core body 21 and the guide part 22 are insert-molded, that is, the valve core body 21 is inserted into the mold of the guide part 22. In this embodiment, the installation connection between the guide part 22 and the valve core body 21 is realized during the injection molding process of the guide part 22, and molding and assembly are simpler. Specifically, the material of the guide part 22 can be nylon or PPS, and the material has high wear resistance, which reduces the wear of the guide part 22 caused by the sliding friction between the guide part 22 and the channel side wall 112.

[0050] Specifically, refer to Fig.12 and Fig.13 The valve core body 21 has a first matching portion 211, the guide portion 22 has a second matching portion 224 matching with the first matching portion 211, one of the first matching portion 211 and the second matching portion 224 has a second recessed portion 24, and the other of the first matching portion 211 and the second matching portion 224 has a second protruding portion 25 located at the second recessed portion 24. In this way, the matching area between the first matching portion 211 and the second matching portion 224 can be increased, so that the connection between the valve core body 21 and the guide portion 22 is more secure.

[0051] More specifically, refer to Fig.12 and Fig.13 The second protruding portion 25 may include a boss, and the second recessed portion 24 may be a groove portion 6, which can increase the contact area between the first matching portion 211 and the second matching portion 224, so that the valve core body portion 21 and the guide portion 22 are more firmly connected. Of course, the first matching portion 211 and the second matching portion 224 can also be a curved surface matching or a folded surface matching (not shown in the figure), which will not be described here.

[0052] For another example, the guide portion 22 and the valve core body 21 are made of metal; in an embodiment where the guide portion 22 is made of plastic or in an embodiment where the guide portion 22 is made of metal, the guide portion 22 has higher wear resistance, thereby reducing the wear on the guide portion 22 caused by the sliding friction between the guide portion 22 and the channel side wall 112; the integrated structure of the guide portion 22 and the valve core body 21 reduces the number of assembly steps, making assembly simpler; or the guide portion 22 and the valve core body 21 are welded and fixed, so that the guide portion 22 and the valve core body 21 are more firmly fixed.

[0053] Of course, in this embodiment, the valve core body 21 has a third matching portion, which is located at the end of the valve core body 21 close to the valve mouth 11, and the guide portion 22 extends from the third matching portion toward the direction close to the valve mouth 11. In the second state 300, the third matching portion and the valve mouth 11 are at least partially abutted. In this way, the sealing problem of the control valve when it is closed is achieved in the second state 300, which will not be repeated here.

[0054] It should be noted that: although this specification has described the present invention in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify, combine or replace the present invention with equivalents, and all technical solutions and improvements thereto that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control valve, comprising a valve seat (1) and a valve core (2), wherein the valve seat (1) has a valve opening (11), the control valve comprises a first chamber (100), at least part of the valve core (2) is located in the first chamber (100), and characterized in that: The valve core portion (2) includes a guide portion (22), and the guide portion (22) is located at the end of the valve core portion (2) close to the valve mouth portion (11), and the valve mouth portion (11) includes a fluid channel (111), and the valve mouth portion (11) includes a channel side wall (112) corresponding to at least a portion of the fluid channel (111). During the entire process of opening and closing the valve, at least a portion of the guide portion (22) is located in the fluid channel (111), and at least a portion of the guide portion (22) abuts against at least a portion of the channel side wall (112).

2. The control valve according to claim 1, characterized in that: The valve core part (2) comprises the valve core body part (21), the guide part (22) comprises a guide body part (221), the guide body part (221) extends from one end of the valve core body part (21) close to the valve mouth part (11) along the extension direction of the fluid channel (111), and at least a part of the guide body part (221) is located in the fluid channel (111); the control valve comprises a conducting port (23), the conducting port (23) is located between the guiding body part (221) and the channel side wall (112), or the conducting port (23) is located at the wall part corresponding to the guiding body part (221).

3. The control valve according to claim 2, characterized in that: The guide body part (221) is in or approximately in an annular shape, and has a guide outer wall (225). At least a portion of the guide outer wall (225) abuts against the channel side wall (112). The conducting port (23) is located at a wall portion corresponding to the guide body part (221). The control valve has a first state (400). In the first state (400), the conducting port (23) conducts the first chamber (100) and the second chamber (200).

4. The control valve according to claim 2, characterized in that: The guide body (221) is in or approximately in an annular shape, and has a guide outer wall (225), at least a portion of which abuts against the channel side wall (112); the control valve has a first recessed portion (5), and the first recessed portion (5) is located at least one of the channel side wall (112) and the guide body (221); the conduction port (23) is located between the guide body (221) and the channel side wall (112); the control valve has a first state (400), and in the first state (400), the conduction port (23) connects the first cavity and the second cavity.

5. The control valve according to claim 2, characterized in that: The guide portion (22) comprises a first protrusion (222), the first protrusion (222) protruding from the guide body portion (221) toward the outer peripheral side of the guide body portion (221), at least a portion of the first protrusion (222) abutting against the channel side wall (112), the conduction port being located between the guide body portion (221) and the channel side wall (112), the control valve having a first state (400), in which the conduction port (23) connects the first chamber (100) and the second chamber (200).

6. The control valve according to claim 5, characterized in that The first protruding portion (222) is a guide rib (223), and the extension direction of the guide rib (223) is consistent with the extension direction of the guide main body (221); the width of at least part of the guide rib (223) gradually decreases along the direction approaching the second cavity (200) and / or the height of at least part of the guide rib (223) gradually decreases along the direction approaching the second cavity (200).

7. The control valve according to any one of claims 1 to 6, characterized in that: The valve core part (2) comprises a valve core body part (21) and a guide part (22), wherein the guide part (22) extends from one end of the valve core body part (21) close to the valve mouth part (11) along the extension direction of the fluid channel (111), the valve core body part (21) is made of metal, and the guide part (22) is made of plastic, and the valve core body part (21) and the guide part (22) are insert-molded.

8. The control valve according to claim 7, characterized in that: The valve core body (21) has a first matching portion (211), the guide portion (22) has a second matching portion (224) matching with the first matching portion (211), one of the first matching portion (211) and the second matching portion (224) has a second recessed portion (24), and the other of the first matching portion (211) and the second matching portion (224) has a second protruding portion (25) located on the second recessed portion (24).

9. The control valve according to claim 4 or 5, characterized in that: The control valve includes a second state (300). In the second state (300), the first chamber and the second chamber are disconnected, the valve core body (21) has a third matching portion (213), and the third matching portion (213) is located at the end of the valve core body (21) close to the valve mouth (11). The guide portion (22) extends from the third matching portion (213) toward the valve mouth (11). In the second state (300), the third matching portion (213) and the valve mouth (11) are at least partially abutted.

10. According to the control valve according to any one of claims 1 to 6, the valve core part (2) includes a valve core body part (21) and a guide part (22), the guide part (22) extends from one end of the valve core body part (21) close to the valve mouth part (11) along the extension direction of the fluid channel (111), and the guide part (22) and the valve core body part (21) are made of metal; the guide part (22) and the valve core body part (21) are an integral structure, or the guide part (22) and the valve core body part (21) are welded and fixed.

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