Throttle valve with cut-off function

Abstract

The throttle valve with the cut-off function comprises a valve body part, a switch part and a valve element part, the valve body part comprises a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel materials, the main valve body comprises a first shell, a second shell and a seat body, the first shell is made of stainless steel plates or stainless steel pipes, and the second shell is made of stainless steel plates or stainless steel pipes. The seat body is made of stainless steel plates or stainless steel pipes, the seat body comprises a main valve port, the switch component comprises a valve rod, the valve element component comprises a valve element, the valve element comprises an auxiliary valve port, the first shell, the seat body and the second shell are welded and fixed, and the first shell is welded and fixed to the connecting sleeve. The material cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a throttle valve with a cut-off function. Background Art

[0002] Figure 4 The figure shows a schematic diagram of the structure of a throttling stop valve in the background technology. Figure 4 As shown, the control valve includes a valve body component 01, which includes a main valve body 010 formed by a brass casting, a valve stem 03 located inside the main valve body 010, the valve stem 03 being threadedly connected to the main valve body 010, a retaining spring 02 being engaged with a retaining groove 011 on the inner wall of the main valve body 010 to limit the valve stem 03 from slipping out of the main valve body 010, and the valve stem is prevented from slipping out and limited. The material cost of the main valve body 010 of the control valve with this structure is high. Summary of the invention

[0003] The object of the present invention is to provide a throttle valve with a cut-off function, comprising a valve body component, a switch component and a valve core component, the valve body component comprising a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel material, the main valve body comprises a first shell, a second shell and a seat body, the first shell is made of stainless steel plate or stainless steel pipe, the seat body is made of stainless steel plate or stainless steel pipe, the seat body comprises a main valve port, the switch component comprises a valve stem, the valve core component comprises a valve core, the valve core comprises an auxiliary valve port, the first shell, the seat body and the second shell are welded and fixed, and the first shell is welded and fixed to the connecting sleeve; the throttle valve with a cut-off function comprises a first working mode, a second working mode and a third working mode, in the first working mode, the valve core opens the main valve port, the valve stem closes the auxiliary valve port, and the first fluid port is communicated with the second fluid port through the main valve port;

[0004] In the second working mode, the valve core closes the main valve port, the valve stem does not close the auxiliary valve port, and the second fluid port, the auxiliary valve port, the main valve port and the first fluid port are connected;

[0005] In the third working mode, the valve core abuts against the main valve port, the valve stem abuts against the auxiliary valve port, and the first fluid port is not connected to the second fluid port.

[0006] The throttle valve with a shut-off function in the above-mentioned scheme has a connecting sleeve made of stainless steel material, and the main valve body includes a first shell, a second shell and a seat body. The first shell is made of stainless steel plate or stainless steel pipe, and the seat body is made of stainless steel plate or stainless steel pipe. The seat body includes a main valve port, the switch component includes a valve stem, the valve core component includes a valve core, and the valve core includes an auxiliary valve port. The first shell, the seat body, and the second shell are welded and fixed, and the first shell is welded and fixed to the connecting sleeve. Compared with the background technology, the material cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1A It is a structural schematic diagram of the first working mode of the throttle valve with a cut-off function of the present application in the first embodiment;

[0008] Figure 1B It is a structural schematic diagram of the throttle valve with cut-off function in the second working mode shown in the first embodiment of the present application;

[0009] Figure 1C It is a structural schematic diagram of the throttle valve with cut-off function shown in the first embodiment of the present application in the third working mode;

[0010] Figure 2 Shown Figure 1A Schematic diagram of the structure of the middle valve cap, switch component and connecting sleeve;

[0011] Figure 3 Shown Figure 1A A three-dimensional schematic diagram of a valve core of a throttle valve with a cut-off function is shown;

[0012] Figure 3A Shown Figure 3 A schematic cross-sectional view of the valve core shown;

[0013] Figure 4 Shown is a structural schematic diagram of a throttling stop valve in the background technology. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings.

[0015] Herein, the forward direction is defined as the fluid flowing from the second fluid port B to the first fluid port A, and the reverse direction is defined as the fluid flowing from the first fluid port A to the second fluid port B. The "longitudinal direction" mentioned below refers to the operating direction of the switch component of the throttle valve with cut-off function.

[0016] like Figure 1A , 1B As shown in 1C, the throttle valve with cut-off function of this embodiment includes a valve body component 1, a switch component 2 and a valve core component 3.

[0017] The valve body component 1 includes a main valve body 11 and a connecting sleeve 12. The main valve body 11 includes a shell and a seat 112. The shell includes a first shell 111A and a second shell 111B. The first shell 111A and the second shell 111B are made of stainless steel plates or stainless steel pipes and are tubular. The connecting sleeve 12 is made of stainless steel material and is welded and fixed to the first shell 111A.

[0018] The seat body 112 is made of a stainless steel sheet by stamping or made of a stainless steel pipe, and a main valve port 1120 is formed on the seat body 112. The material and process costs of the seat body are reduced. Specifically, the seat body 112 includes a circular plate portion 1121 and an annular portion 1122, the plate portion 1121 has an axial through hole as the main valve port 1120, the annular portion 1122 extends from the outer edge of the plate portion 1121 toward the first fluid port A, the outer wall of the annular portion 1122 of the seat body 112 is welded and fixed to the first shell 111A, and the second shell 111B is welded and fixed to the inner wall of the annular portion 1122. Specifically, the first shell 111A, the seat body 112 and the second shell 111B are fixed by furnace welding together, that is, the three can be furnace welded in a furnace at the same time to improve welding efficiency. Specifically, the outer wall of the annular portion 1122 of the seat body 112 is interference fit with the inner wall of the first shell 111A, the outer wall of the second shell 111B is interference fit with the inner wall of the annular portion 1122 of the seat body 112, and the upper end of the second shell 111B abuts against the plate portion 1121 of the seat body 112, thereby pre-positioning the seat body 112, the first shell 111A and the second shell 111B before welding.

[0019] The valve body component 1 also includes a joint 13, which is also made of stainless steel. In the present embodiment, the joint 13 is specifically made of stainless steel bars by lathing. The first shell 111A has an annular protrusion 1110 drawn out on its side wall by a drawing hole process. One end of the annular protrusion 1110 serves as the first interface B1. One end of the joint 13 extends from the annular protrusion 1110 into the inner cavity of the first shell 111A. The outer wall of the joint 13 is welded and fixed to the annular protrusion 1110. Specifically, the seat body 112, the first shell 111A, the second shell 111B and the joint 13 can be fixed by furnace welding together to further improve the welding efficiency.

[0020] One end of the second shell 111B can be expanded to form a first fluid port A for fluid to enter or flow out, or the second shell 111B can be formed by a shrinking process to form the first fluid port A. The shell adopts a split design of the first shell 111A and the second shell 111B, which makes the processing of the shell simpler than the integral molding of the two, and reduces the process cost.

[0021] The second shell 111B may be formed by a stainless steel tube through one or several combinations of shrinking / stretching / expansion processes, or may be formed by a stainless steel tube made from a stainless steel sheet through one or several combinations of shrinking / stretching / expansion processes.

[0022] In the throttle valve with cut-off function of the above scheme, the connector 13 includes a through hole 131, which is connected to the inner cavity of the first shell 111A, and the end of the connector 13 away from the shell forms a second fluid port B (i.e., the end of the through hole 131 away from the shell) for fluid to enter or flow out.

[0023] It should be noted that, in the embodiments described herein, the connector 13 may not be provided, and the first interface B1 may be directly used as the second fluid port B.

[0024] The throttle valve with a cut-off function also includes a first filter element 4, which is at least partially located in the annular portion 1122 of the seat body 112. The first filter element 4 is also made of stainless steel and is welded and fixed to the seat body 112. The first filter element 4 is located in the second housing 111B, and the function of the first filter element 4 is to filter the fluid entering from the first fluid port A.

[0025] like Figure 2 As shown, the connecting sleeve 12 has internal threads and external threads, the first valve bonnet 5 of the throttle valve with a cut-off function is externally mounted on the connecting sleeve 12 , the first valve bonnet 5 has internal threads, and the internal threads of the first valve bonnet 5 are threadedly connected to the external threads of the connecting sleeve 12 .

[0026] The switch component 2 includes a valve stem 21, which includes an external thread. The valve stem 21 is at least partially located in the connecting sleeve 12. The valve stem 21 is threadedly connected to the connecting sleeve 12. The valve stem 21 can rotate relative to the connecting sleeve 12 under the action of external force and can be longitudinally displaced in the axial direction of the connecting sleeve 12, that is, the longitudinal displacement of the throttle valve with a cut-off function.

[0027] The connecting sleeve 12 includes a first external thread section 121, an insert section 122 and a first radially outwardly protruding section 123. The first external thread section 121 has external threads. The first radially outwardly protruding section 123 is located between the first external thread section 121 and the first insert section 122. The first radially outwardly protruding section 123 radially protrudes outward relative to the root of the first external thread section 121 and the outer wall of the first insert section 122. The first insert section 122 is inserted into the first housing 111A. In the longitudinal direction of the throttle valve with a cut-off function, the first radially outwardly protruding section 123 abuts against the upper end of the first housing 111A. The outer wall of the first insert section 122 is interference-fitted with the inner wall of the first housing 111A. The upper end of the first housing 111A is welded and fixed to the connecting sleeve 12. The design of the first insert section 122 and the first radially outwardly protruding section 123 facilitates the radial positioning and axial positioning of the connecting sleeve 12 and the first housing 111A.

[0028] like Figure 2 As shown, the inner wall of the connecting sleeve 12 includes a first internal thread segment 124, a first radial inward convex segment 125, and a first guide segment 126. The first internal thread segment 124 has an internal thread, and the first radial inward convex segment 125 radially protrudes inward relative to the root of the first internal thread segment 124 and the first guide segment 126. The inner diameter of the first guide segment 126 is larger than the inner diameter of the first radial inward convex segment 125, and the first guide segment 126 can guide the axial movement of the switch component 2.

[0029] In this embodiment, the valve stem 21 is made by lathing a stainless steel bar, and the valve stem 21 includes a second external threaded section 211, a second radially outwardly protruding section 212, a third radially outwardly protruding section 213, a seal installation section 214, and a valve stem guide section 215. The seal installation section 214 is cylindrical, and the seal 22 is sleeved on the seal installation section 214. The seal 22 abuts against the outer wall of the seal installation section 214 and the inner wall of the first guide section 126 of the connecting sleeve 12. The outer wall of the second radially outwardly protruding section 212 and the outer wall of the third radially outwardly protruding section 213 protrude radially outward relative to the outer wall of the seal installation section 214. In the longitudinal direction of the throttle valve with a cut-off function, the second radially outwardly protruding section 212 and the third radially outwardly protruding section 213 limit the seal 22 axially. The cooperation between the first radial inward convex section 125 of the connecting sleeve 12 and the second radial outward convex section 212 of the valve stem 21 prevents the switch component 2 from falling out from the upper end of the connecting sleeve 12 in the longitudinal direction of the throttle valve with a cut-off function. That is, the first radial inward convex section 125 has an axial upward anti-falling effect on the switch component 2. The valve stem 21 is installed from the lower end of the connecting sleeve 12, and there is no need to separately set a part on the connecting sleeve 12 to prevent the valve stem 21 from falling out of the connecting sleeve 12, which reduces the number of parts and simplifies the assembly process. Specifically in this embodiment, the cross-sections of the first radial inward convex section 125 and the second radial outward convex section 212 are both circular, and the outer diameter of the second radial outward convex section 212 is larger than the inner diameter of the first radial inward convex section 125.

[0030] The cross section of the third radial outward protrusion section 213 is also circular. The outer diameters of the second radial outward protrusion section 212 and the third radial outward protrusion section 213 may be equal or unequal. In this embodiment, as a preferred solution, the outer diameters of the two are equal to facilitate processing.

[0031] The second radially outward convex section 212, the third radially outward convex section 213 and the seal 22 are located in the connecting sleeve 12. In the axial direction of the connecting sleeve 12, the seal 22 is located between the second radially outward convex section 212 and the third radially outward convex section 213. The second radially outward convex section 212, the third radially outward convex section 213 and the seal 22 are slidably matched with the first guide section 126 of the connecting sleeve 12, and the seal 22 is dynamically sealed with the first guide section 126.

[0032] The valve stem guide section 215 is located at the lower side of the third radial outward protrusion section 213. In the present embodiment, the valve stem guide section 215 is specifically cylindrical. Of course, the shape of the valve stem guide section 215 is not limited to cylindrical, as long as it can adapt to the valve core component 3 to realize its function.

[0033] The valve stem guide section 215 is provided with a valve core component 3. In this embodiment, the valve core component 3 is specifically a valve core 31, which is made of a non-metallic material. The valve core 31 is selected from a material with high efficiency sealing and excellent temperature resistance. The valve core 31 can be made of a polymer material such as polytetrafluoroethylene with good creep resistance. The valve core 31 includes a secondary valve port 30, and the valve stem 21 can open or close the secondary valve port 30.

[0034] Specifically, Figure 3 , Figure 3A As shown, in this embodiment, the valve core 31 is cylindrical as a whole. Of course, its structure is not limited to this, as long as it can cooperate with the valve stem 21 to realize its function. In this embodiment, the valve core 31 is an axial through structure, and the valve core 31 includes an axially through valve core guide section 311 and an axially through valve core sealing section 312. The flow area of ​​the valve core guide section 311 is larger than the flow area of ​​the valve core sealing section 312. In this embodiment, the valve core 31 includes a large-diameter section and a small-diameter section. The inner wall of the large-diameter section is slidably matched with the outer wall of the valve stem 21. The large-diameter section serves as the valve core guide section 311, and the small-diameter section serves as the valve core sealing section 312.

[0035] The cross-sections of the inner holes of the valve core guide section 311 and the valve core sealing section 312 are both circular, and the inner diameter of the valve core guide section 311 is larger than the inner diameter of the valve core sealing section 312. The portion below the valve core guide section 311 is the valve core sealing section 312. The valve stem guide section 215 is at least partially located in the valve core guide section 311 and can be slidably matched with the valve core guide section 311 in a clearance. The valve stem guide section 215 can guide the sliding of the valve core 31, thereby improving the reliability of the operation of the valve core 31. In the longitudinal direction of the throttle valve with a shut-off function, the projection of the outer edge of the valve core guide section 311 of the valve core 31 is located in the projection of the inner wall of the first guide section 126 of the connecting sleeve 12, so that when the throttle valve with a shut-off function is in the first working mode, the valve core guide section 311 of the valve core 31 is at least partially located in the first guide section 126, which is conducive to reasonable use of space and reducing the longitudinal size of the throttle valve with a shut-off function. Furthermore, in the process of switching from the second working mode or the third working mode described below to the first working mode, the first guide section 126 of the connecting sleeve 12 can further guide the axial movement of the valve core 31, that is, starting from the upper end of the valve core 31 sliding into the first guide section 126, the inner side of the valve core 31 is guided by the valve stem guide section 215, and the outer side of the valve core 31 is also guided by the first guide section 126 of the connecting sleeve 12. The valve core 31 is well guided, and the valve core 31 does not deflect axially during its axial displacement, thereby improving the operation reliability of the valve core 31 and preventing it from getting stuck.

[0036] like Figure 3 , Figure 3A As shown, the side wall of the valve core guide section 311 includes a communication channel. When the valve stem 21 opens the auxiliary valve port 30, the communication channel can be communicated with the auxiliary valve port 30. Specifically, in this embodiment, the communication channel is a through hole provided on the side wall of the valve core guide section 311. The communication channel communicates with the side wall and outer wall of the valve core guide section 311. In this embodiment, it is specifically a radial through hole penetrating the side wall of the valve core guide section 311. The communication channel includes a first communication channel 3111 and a second communication channel 3112. The first communication channel 3111 and the second communication channel 3112 are radially connected on the valve core guide section 311, which is convenient for processing. The valve core sealing section 312 of the valve core 31 has the aforementioned auxiliary valve port 30. The valve stem 21 can open or close the auxiliary valve port 30. In this embodiment, the valve core sealing section 312 is located at the lower side of the valve stem guide section 215. Of course, it can be understood that the lower end of the valve stem guide section 215 can also be directly used as the valve core sealing section. It is understandable that the communication channel may also have other structural designs.

[0037] like Figure 1BAs shown, the throttle valve with cut-off function also includes a second filter element 6, which is located in the valve body component 1. In this embodiment, the second filter element 6 is located in the inner cavity of the first shell 111A, and the second filter element 6 is welded and fixed to one end of the connector 13 close to the valve core 31.

[0038] The second filter element 6 is used to filter the fluid entering from the second fluid port B.

[0039] The second filter element 6 is also made of stainless steel.

[0040] The throttle valve with cut-off function of the present application can realize the following three working modes:

[0041] The first working mode:

[0042] like Figure 1A , which shows a schematic diagram of the structure of the throttle valve with a cut-off function in the first working mode of the first embodiment. The valve stem 21 is in a first relative position relative to the connecting sleeve 12, and the fluid enters from the first fluid port A. Under the action of the fluid pressure difference, the fluid flows to the main valve port 1120 and then opens the valve core 31, so that the valve core 31 slides axially upward relative to the valve stem 21, and the valve core 31 leaves the main valve port 1120, and the first fluid port A is connected with the second fluid port B.

[0043] like Figure 1A As shown, the throttle valve with a cut-off function includes a first flow channel X for fluid to flow from the first fluid port A to the main valve port 1120, and the minimum flow area of ​​the first flow channel X is greater than the flow area of ​​the main valve port 1120, so that the main valve port 1120 has a throttling function in this working mode. When the throttle valve with a cut-off function is applied to an air-conditioning system, in this working mode, the throttle valve with a cut-off function realizes the throttling function in the cooling state.

[0044] The second working mode:

[0045] like Figure 1B , which is a schematic structural diagram of the throttle valve with cut-off function in the first embodiment when it is in the second working mode.

[0046] As shown in the figure, the valve stem 21 is in the first relative position relative to the connecting sleeve 12, and the fluid enters from the second fluid port B. The valve core 31 can slide relative to the valve stem 21 toward the main valve port 1120 under its own gravity and close the main valve port. At this time, the fluid can flow out in sequence through the connecting channel of the valve core 31, the inside of the valve core 31, the main valve port 1120 and the first fluid port A. When the throttle valve with a cut-off function is used in an air-conditioning system, in this working mode, the throttle valve with a cut-off function realizes the throttling function in the heating state.

[0047] In this mode, since the valve core 31 is designed with a valve core guide section 311 and a valve core sealing section 312, the minimum flow area of ​​the valve core sealing section 312 is smaller than the flow area of ​​the main valve port 1120, and the valve core sealing section 312 has a certain length in the axial direction of the valve core 31, then the benefit of the valve core sealing section 312 is equivalent to adding a throttling line between the main valve port 1120 and the second fluid port B, which is also equivalent to extending the throttling time or extending the length of the throttling flow channel, thereby improving the heating effect when it is used in the air-conditioning system.

[0048] The third working mode:

[0049] like Figure 1C As shown, in this working mode, the throttle valve with cut-off function plays a cut-off function. Specifically, as shown in the figure, compared with Figure 1A or Figure 1B The valve stem 21 is shown in a first relative position relative to the connecting sleeve 12. Figure 1C In the state shown, the valve stem 21 is in a second relative position relative to the connecting sleeve 12. The second relative position is in the first relative position state. Figure 1B In the state shown, the valve stem 21 is threadedly rotated relative to the connecting sleeve 12 in the direction close to the main valve port 1120, and the valve stem 21 is axially closed to the auxiliary valve port 30 of the valve core 31 according to the specified torque. The valve core 31 is further pressed against the seat body 112 through force transmission, so that the valve core 31 further closes the main valve port 1120, thereby improving the leakage of the throttle valve with a shut-off function at the main valve port 1120 and cutting off the connection between the first fluid port A and the second fluid port B.

[0050] When the main valve port 1120 needs to be opened, the valve stem 21 is moved upward relative to the connecting sleeve 12 , and then the valve core 31 can leave the main valve port 1120 under the action of the fluid pressure entering from the first fluid port A.

[0051] like Figure 3A As shown, the lower end surface of the valve core 31 abuts against the upper end surface of the seat body 112 to close the main valve port 1120. In order to further improve the sealing performance of the cooperation between the two, at least one circle of annular groove 3121A is designed on the lower end surface of the valve core 31, that is, the end surface of the valve core sealing section 312 facing the main valve port 1120. By setting the aforementioned annular groove 3121A, the contact area between the valve core 31 and the seat body 112 is reduced, thereby increasing the sealing pressure ratio and improving the sealing effect.

[0052] It can be known from the above that the valve stem 21 cooperates with the valve core 31 to open or close the main valve port 1120 .

[0053] The throttle valve with cut-off function in the above-mentioned embodiments may further include a connecting portion Z, which is a copper layer or a copper joint and is located on the inner wall and / or outer wall of the second housing 111B.

[0054] The throttle valve with a cut-off function of the present application has both a throttling function and a cut-off function, and does not need to use brass materials, which not only reduces material costs and process costs, but also facilitates the lightweight and miniaturization of the throttle valve with a cut-off function.

[0055] The above description is only an example of a specific embodiment of the present invention and should not be construed as a limitation on the protection points of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A throttle valve with a cut-off function, comprising a valve body component, a switch component and a valve core component, the valve body component comprising a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel, the main valve body comprises a first shell, a second shell and a seat body, the first shell is made of a stainless steel plate or a stainless steel pipe, the seat body is made of a stainless steel plate or a stainless steel pipe, the seat body comprises a main valve port, the switch component comprises a valve stem, the valve core component comprises a valve core, the valve core comprises a secondary valve port, the first shell, the seat body and the second shell are welded and fixed, and the first shell is welded and fixed to the connecting sleeve; The throttle valve with cut-off function includes a first working mode, a second working mode and a third working mode. In the first working mode, the valve core opens the main valve port, the valve stem closes the auxiliary valve port, and the first fluid port is connected with the second fluid port through the main valve port; In the second working mode, the valve core closes the main valve port, the valve stem does not close the auxiliary valve port, and the second fluid port, the auxiliary valve port, the main valve port and the first fluid port are connected; In the third working mode, the valve core abuts against the main valve port, the valve stem abuts against the auxiliary valve port, and the first fluid port is not connected to the second fluid port.

2. The throttle valve with cut-off function according to claim 1, characterized in that: The first shell, the seat body and the second shell are fixed together by furnace welding.

3. The throttle valve with cut-off function according to claim 2, characterized in that: The main valve body includes a joint, and the joint includes a through hole. The through hole is connected to the inner cavity of the first shell. The joint is made of stainless steel. The first shell, the seat body, the second shell and the joint are fixed by furnace welding.

4. The throttle valve with cut-off function according to claim 2, characterized in that: The seat body includes a plate portion and an annular portion extending from the outer edge of the plate portion toward the first fluid port, the plate portion includes the main valve port, the inner wall of the first shell is welded and fixed to the outer wall of the annular portion, and the outer wall of the second shell is welded and fixed to the inner wall of the annular portion.

5. The throttle valve with cut-off function according to claim 3, characterized in that: The throttle valve with a cut-off function includes a first filter element and a second filter element, the first filter element is welded and fixed to the seat body, the first filter element can filter the fluid entering from the first fluid port, the side wall portion of the first shell includes an annular protrusion, one end of the joint is located on the annular protrusion, the second filter element is located in the inner cavity of the first shell, the second filter element is welded and fixed to the joint, and the second filter element can filter the fluid entering from the second fluid port.

6. The throttle valve with cut-off function according to any one of claims 1 to 5, characterized in that: The connecting sleeve is cylindrical and includes a first radially outwardly protruding section. In the axial direction of the connecting sleeve, the first radially outwardly protruding section abuts against the upper end of the first shell.

7. The throttle valve with cut-off function according to any one of claims 1 to 5, characterized in that: It also includes a valve stem and a valve core, wherein the outer wall of the valve stem is threadedly connected to the inner wall of the connecting sleeve, the valve core is axially through-cylindrical, and part of the inner wall of the valve core is slidably matched with the outer wall of the valve stem.

8. The throttle valve with cut-off function according to claim 7, characterized in that: It also includes a sealing member, the connecting sleeve is made by turning a bar, the valve stem is made by turning a stainless steel bar, the inner wall of the connecting sleeve includes a first radial inner convex portion, the valve stem includes a second radial outer convex section, a third radial outer convex section and a sealing member installation section, the sealing member is sleeved in the sealing member installation section, the sealing member is located between the second radial outer convex section and the third radial outer convex section, the sealing member abuts against the outer wall of the sealing member installation portion and the inner wall of the connecting sleeve, and in the axial direction of the connecting sleeve, the first radial inner convex portion can limit the axial upward movement of the valve stem relative to the connecting sleeve.

9. The throttle valve with cut-off function according to claim 8, characterized in that: The valve core includes a communication channel. When the throttle valve with a cut-off function is in the second working mode, the second fluid port, the communication channel, the auxiliary valve port, the main valve port and the first fluid port are connected in sequence.

10. The throttle valve with cut-off function according to claim 9, characterized in that: The valve core is made of non-metallic material, and includes a large-diameter section and a small-diameter section. The inner wall of the large-diameter section is slidably matched with the outer wall of the valve stem, and the small-diameter section includes the auxiliary valve port. The connecting channel is a through hole connecting the inner wall and the outer wall of the large-diameter section.

11. The throttle valve with cut-off function according to any one of claims 1 to 5, characterized in that: It also includes a connecting part, which is a copper layer or a copper joint, and the connecting part is located on the inner wall and / or outer wall of the second shell.

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