CN112303245B

CN112303245B - Flow control valve

Info

Publication number: CN112303245B
Application number: CN201910900942.8A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2019-07-29
Filing date: 2019-09-23
Publication date: 2023-04-18
Anticipated expiration: 2039-09-23
Also published as: CN112303245A

Abstract

The invention provides a flow control valve, wherein a valve body assembly comprises a valve body and a positioning piece, a connecting part comprises a connecting frame, a nut sleeve and a connecting sleeve, the connecting sleeve is fixedly connected with the connecting frame, a valve seat part comprises a valve seat and a valve core sleeve, the valve seat comprises a valve seat opening communicated with a first flow opening, the valve core sleeve is fixedly connected with the connecting sleeve, the valve core sleeve comprises a flow regulating channel, the valve core part can axially slide relative to the valve core sleeve to regulate the flow area of the flow regulating channel, the valve body comprises a first positioning part, the connecting frame comprises a second positioning part, the positioning piece is matched with the first positioning part and the second positioning part to limit the circumferential rotation of the connecting frame relative to the valve body, the connecting frame is fixedly connected with the valve body through the nut sleeve, and the flow control valve is beneficial to the control of the circumferential relative positions of the flow regulating channel and a second flow opening through the matching of the positioning piece and the first positioning part and the second positioning part.

Description

Flow control valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a flow control valve.

Background

The flow control valve comprises a control component, a valve body component, a valve seat component, a transmission component and a valve core component. Fig. 13 is a schematic structural view of a flow control valve of the related art. Fig. 14 is a perspective view of the flow regulating member of fig. 13. The valve body part comprises a valve body 01, a flow regulating part 02 is welded and fixed with the valve body 01, a flow regulating channel 021 is formed in the wall of the flow regulating part 02, and when the flow control valve operates, a valve core 03 of the valve core part is axially moved through the transmission of a transmission mechanism under the action of a control part, so that the lower end of the valve core 03 is abutted against or far away from a valve opening part of the flow control valve. The flow control valve, however, is not suitable for controlling the relative position of the flow regulating channel 021 and the fluid port 011 in the circumferential direction because the flow regulating member 02 needs to extend into the valve body 01 for welding.

Disclosure of Invention

The application provides a flow control valve, including valve body subassembly, valve module, the valve body subassembly includes valve body and setting element, the valve body includes first circulation mouth and second circulation mouth, the valve module includes control unit, adapting unit, drive disk assembly, valve seat part and case part, control unit includes casing part, driver and output shaft, the case part includes the case, drive disk assembly include with output shaft threaded connection's nut, the case part with the nut transmission is connected, the nut can drive the case part for the adapter sleeve axial slip is so that the case with the sealing part butt or the separation of valve seat part, adapting unit includes link, nut cover, adapter sleeve, the adapter sleeve with link fixed connection, the valve seat part includes disk seat, case cover, the disk seat include with the disk seat mouth of first circulation mouth intercommunication, the case cover with adapter sleeve fixed connection, the case cover includes the flow control passageway, the case part can for the valve seat cover axial slip is in order to adjust the through flow control passageway area of flow control passageway, the valve body includes first positioning portion, the link includes the second positioning portion, the valve body with the valve body is in order that the second positioning portion connects the cooperation of valve body and the restriction nut connects the nut frame, the valve body connects the cooperation.

The flow control valve of this scheme, the valve body include first location portion, and the link includes second location portion, and setting element and first location portion and the cooperation of second location portion do benefit to the control of flow control passageway and second circulation mouth in circumference relative position.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a flow control valve of the present application;

FIG. 2 is a schematic diagram of the construction of the valve assembly of the flow control valve of FIG. 1;

FIG. 3 is a partial schematic structural view of the connecting member of FIG. 2;

FIG. 4 is a schematic diagram illustrating a structure of the position limiting element in FIG. 3;

FIG. 5 is a schematic view of the valve seat member of FIG. 1;

FIG. 6 is a schematic view of the cartridge housing of FIG. 5;

FIG. 7 shows I in FIG. 1 ₁ A partial structure diagram of (1);

FIG. 8 shows the graph I in FIG. 1 ₂ A partial structure diagram of (1);

FIG. 9 is a perspective view of the connecting bracket of FIG. 1;

FIG. 10 is a perspective view of the nut shell of FIG. 1;

fig. 11 is a schematic structural view of a second embodiment of the flow control valve of the present application;

FIG. 12 shows the symbol I in FIG. 11 ₃ A partial structure diagram of (1);

FIG. 13 is a schematic view of a flow control valve of the prior art;

fig. 14 is a perspective view of the flow control member of fig. 13.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural view of a first embodiment of a flow control valve according to the present invention, fig. 2 is a schematic structural view of a valve assembly of the flow control valve in fig. 1, fig. 3 is a schematic structural view of a portion of a connecting member in fig. 2, fig. 4 is a schematic structural view of a retainer in fig. 3, fig. 5 is a schematic structural view of a seat member in fig. 1, fig. 6 is a schematic structural view of a spool housing in fig. 5, and fig. 7 is a schematic structural view of I in fig. 1 ₁ A partial structure diagram of (1), FIG. 8 is a diagram of the structure I ₂ Fig. 9 is a perspective view of the connection bracket of fig. 1, and fig. 10 is a perspective view of the nut holder of fig. 1.

As shown in fig. 1, 2, and 5, the flow control valve of the present embodiment includes a valve body assembly 100 and a valve assembly 200, the valve body assembly 100 includes a valve body 10, and the valve body 10 includes a first connection pipe 101, a second connection pipe 102, a first connection pipe a, and a second connection pipe B. The valve assembly 200 includes a control member 21, a connecting member 22, a transmission member 23, a valve seat member 24, and a spool member 25. The control member 21 includes a housing member 211, an output shaft 212, and a driver 213 disposed within the housing member 211, and the driver 213 may be embodied as a motor. The connecting member 22 includes a connecting sleeve 221 and a stopper 2231. The transmission member 23 includes a nut 231 screwed to the output shaft 212, and the stopper 2231 restricts circumferential rotation of the nut 231, and the nut 231 is axially movable relative to the stopper 2231. The valve seat member 24 includes a valve seat 241 and a valve body cover 242, the valve seat 241 includes a valve seat port 2411 communicating with the first flow port 101, and an outer wall of the valve seat 241 is clearance-fitted to an inner wall of the valve body 10. The valve core sleeve 242 is fixedly connected with the connecting sleeve 221, and the valve core sleeve 242 is fixedly connected with the valve seat 241. The valve core sleeve 242 comprises a flow regulating channel 2420, the valve core part 25 is in transmission connection with the nut 231, the valve core part 25 comprises a valve core 251, and the nut 231 can drive the valve core part 25 to axially slide relative to the connecting sleeve 221 so as to enable the valve core 251 to abut against or separate from the sealing part 2431 of the valve seat part 24; the spool member 25 is axially slidable relative to the spool sleeve 242 to adjust the flow area of the flow adjustment passage 2420.

According to the flow control valve, the valve core sleeve 242 is fixedly connected with the connecting sleeve 221, the valve core sleeve 242 is fixedly connected with the valve seat 241, the outer wall of the valve seat 241 is in clearance fit with the inner wall of the valve body 10, and the valve core sleeve 242 and the valve seat 241 are not fixed through threads or welding, so that the connecting sleeve 221, the valve core sleeve 242 and the valve seat 241 are fixedly connected into a whole and can be integrally installed into a valve body assembly, even if the valve body 10 is slightly deformed in the machining process, the assembling of the connecting sleeve 221 is basically not influenced, undesired axial deflection cannot be generated after the connecting sleeve 221 is installed into the valve body 10, the reliability of the matching of the valve core 251 and the valve seat opening 2411 is improved, and the requirement on the machining precision of the valve body 10 is lowered. In addition, because the connecting sleeve 221 basically does not deflect undesirably, compared with the prior art, the friction between the valve core sleeve 242 and the valve core 251 during the axial sliding process is reduced or even avoided, and the action flexibility and the action reliability of the flow control valve are improved. The valve core part 25 can axially slide relative to the inner wall of the connecting sleeve 221, the coaxiality of the valve core part 25 after the valve core part 25 is installed in the valve body 10 can be guaranteed only by the connecting sleeve 221, and is not influenced by the machining precision of the valve body 10, when the valve core 251 abuts against the sealing portion 2431 to close the valve, the phenomenon that the valve core 251 is partially lifted away from the sealing portion 2431 relative to the sealing portion 2431 is improved, and the sealing reliability of the flow control valve is improved.

In this embodiment, as shown in fig. 2, the connecting component 22 further includes a connecting frame 222 and a limiting member 223 fixed to the connecting frame 222 by welding, the housing component 211 includes a housing 2111, an upper portion of the connecting frame 222 is fixed to the housing 2111 by welding, and a lower portion of the connecting frame 222 is fixed to the connecting sleeve 221 by welding. Optionally, the housing 2111, the connecting frame 222, the limiting member 223 and the connecting sleeve 221 can be fixed by furnace welding in a one-time welding manner, so that the welding steps are reduced. In this embodiment, the housing 2111, the connecting frame 222, the limiting member 223 and the connecting sleeve 221 are all made of stainless steel, so as to reduce the use of copper material.

As shown in fig. 1, 3, 4, and 9, the link 222 includes annular upper and

lower protrusions

2225 and 2222, and a side protrusion 2223. The hole wall of the first through hole 2221 of the link 222 further includes a second stepped portion 2226 having a step facing downward. The inner wall of the connection sleeve 221 includes a first step 2211 with an upward facing step. The lower end of the housing 2111 is sleeved on the outer periphery of the upper projection 2225 of the connecting frame 222, and the lower projection 2222 of the connecting frame 222 is located in the inner cavity of the connecting sleeve 221 and abuts against the step surface of the first step portion 2211. The limiting portion 2231 of the limiting member 223 has a substantially quadrilateral structure with a square second through hole 2232, and the limiting member 223 further includes an external protrusion 2220 extending in a substantially radial direction along a lower end of the limiting portion 2231. The limiting member 223 extends into the first through hole 2221 of the connecting frame 222, and the convex portion 2220 overlaps the second step portion 2226. By the arrangement, the pre-positioning among the parts can be realized before the shell 2111, the connecting frame 222, the limiting part 223 and the connecting sleeve 221 are welded, and the coaxiality among the parts can be ensured.

After the housing 2111, the connecting frame 222, the limiting member 223 and the connecting sleeve 221 are welded into a whole, the driver 213 and the output shaft 212 of the control component 21 extend into the housing 2111 from above the housing 2111, and the lower end of the output shaft 212 extends out of the housing 2111 and then extends into the second through hole 2232 of the limiting member 223. The upper end of the nut 231 of the transmission member 23 extends into the second through-hole 2232 and has its internal thread in mating threaded connection with the external thread of the lower end of the output shaft 212. The shape of the outer wall of the upper end portion of the nut 231 is adapted to the shape of the second through hole 2232, and four sides of the limiting portion 2231 of the limiting member 223 limit the circumferential rotation of the nut 231. Of course, it should be understood that the shape of the second through hole 2232 of the limiting member 223 and the engaging portion of the nut 231 with the limiting member 2231 is not limited to a quadrilateral structure, as long as the nut 231 can move axially without rotating circumferentially after the two are engaged.

As shown in fig. 1 and 5, the valve seat member 24 includes a first seal 243 and an inner liner 244 in addition to the valve seat 241 and the valve body sleeve 242. The lower portion of the valve core sleeve 242 is fixed to the valve seat 241 made of stainless steel by laser welding, and the upper portion of the valve core sleeve 242 is fixed to the connection sleeve 221 by laser welding or by press fitting. In the flow control valve of the present embodiment, after the housing 2111, the connecting frame 222, the limiting member 223, the connecting sleeve 221, the valve core sleeve 242 and the valve seat 241 are fixedly connected, they can be installed as a whole in the valve body cavity of the valve body 10. The coaxiality of the parts is relatively good, and the assembly is also convenient.

The first sealing member 243 is seated on the valve seat 241 and is fixedly connected to the valve seat 241, and the first sealing member 243 includes the aforementioned sealing portion 2431. As shown in fig. 6, the valve core sleeve 242 has a substantially cylindrical structure, and a third step part 2421 with a downward step surface is provided at the lower end of the valve core sleeve 242. The step surface of the third step part 2421 abuts against the upper surface of the first seal 243, the outer edge of the first seal 243 abuts against the step wall of the third step part 2421, and the inner edge of the first seal 243 abuts against the outer wall of the inner bush 244 and is pressed by the step surface of the inner bush 244 facing downward. Thus, the inner end and the outer end of the upper surface of the first seal 243 are pressed by the inner liner 244 and the valve core sleeve 242, respectively, and the first seal 243 is effectively prevented from being lifted off the valve seat 241 by the fluid pressure, thereby improving the sealing reliability of the valve.

Two circulation holes are symmetrically arranged on the circumferential wall of the valve core sleeve 242 at intervals to serve as flow regulating channels 2420. As shown in fig. 2, the valve core component 25 further includes a dynamic seal component 252, a base 253, and a connecting seat 254, the valve core 251 is substantially cylindrical, the connecting seat 254 is welded and fixed to the valve core 251, the connecting seat 254 is in threaded connection with the base 253, the base 253 includes a second overlapping portion 2531, and the nut 231 includes a supporting portion 2311 overlapping with the second overlapping portion 2531, so that the nut 231 drives the valve core component 25 to axially slide relative to the connecting sleeve 221. During the axial sliding process of the valve core component 25 relative to the connecting sleeve 221, the outer edge of the dynamic sealing component 252 is abutted against the inner wall of the connecting sleeve 221, and the inner edge of the dynamic sealing component 252 is abutted against the connecting seat 254. The nut 231 can drive the valve core 251 to axially slide relative to the connecting sleeve 221 so that the valve core 251 is separated from the sealing portion 2431 of the valve seat 241, and in the axial sliding process of the valve core 251, the flow area of the flow adjusting passage 2420 can be adjusted to adjust the flow of the flow control valve. When the valve body 251 abuts against the seal portion 2431 of the valve seat member 24, the movable seal member 252 can prevent leakage between the first fluid port 101 and the second fluid port 102. It will be appreciated that the dynamic seal member 252 may be disposed on the connecting sleeve 221, for example, a step may be disposed at the lower portion of the connecting sleeve 221, and the dynamic seal member 252 may be disposed on the step to slide the valve core member relative to the dynamic seal member 252.

As shown in fig. 1 and 7, the valve body assembly 100 further includes a second sealing member 11, specifically, the valve body 10 includes an inner supporting portion 110, the inner supporting portion 110 includes a first annular groove portion 103, the first annular groove portion 103 includes a first inner wall portion 1031 and a first outer wall portion 1032, the second sealing member 11 is disposed in the first annular groove portion 103, and a lower end surface of the valve seat 241 abuts against an upper end surface of the first inner wall portion 1031 and the second sealing member 11, and thus, when the first flow port 101 is not communicated with the second flow port 102 when the valve needs to be closed, the second sealing member 11 is disposed to limit the fluid leakage between the upper end surface of the first inner wall portion 1031 and the lower end surface of the valve seat 241. The outer wall of the valve seat 241 is in clearance fit with the first outer wall portion 1032, which is also beneficial to the compression fit of the valve seat 241 and the second sealing member 11, and the tight fit between the outer wall of the valve seat 241 and the inner wall of the valve body 10 is avoided to influence the compression of the valve seat 241 and the first sealing member 11.

As shown in fig. 1 and 5, in the process of the fluid flowing from the first connecting pipe a to the second connecting pipe B, the flow path is the first connecting pipe a → the first flow hole 101 → the valve seat opening 2411 → the flow regulating passage 2420 → the second connecting pipe B. Of course, the flow control valve of the present scheme can realize a bidirectional flow function, that is, fluid can also enter from the second connecting pipe B and flow out from the first connecting pipe a. In the process that the housing 2111, the connecting frame 222, the limiting member 223, the connecting sleeve 221, the valve core sleeve 242, the valve seat 241 and the valve core component 25 are integrally assembled and then integrally installed in the valve body cavity of the valve body 10, the relative position relationship between the flow rate adjusting channel 2420 and the second circulation port 102 in the circumferential direction has a large influence on the fluctuation of the flow rate curve of the flow rate control valve. In order to align the adjustment passage 2420 with the second flow port 102 in the circumferential direction as much as possible, in the present embodiment, a set of circumferential positioning mechanisms is designed. As shown in fig. 8 to 9, the connecting frame 222 includes a second positioning portion 2224, the second positioning portion 2224 is a recess provided on an outer wall of the side protrusion 2223 of the connecting frame 222, the upper end portion of the valve body 10 is provided with an insertion hole extending downward from the upper end surface thereof as the first positioning portion 104, the lower end of the rod-shaped positioning member 12 extends into the first positioning portion 104, and a portion of the positioning member 12 that does not extend into the first positioning portion 104 can be inserted into the second positioning portion 2224. Thus, since the connecting frame 222, the connecting sleeve 221 and the valve core sleeve 242 are fixedly connected, under the cooperation of the first positioning portion 104, the second positioning portion 2224 and the positioning member 12, the positional relationship between the flow rate adjusting channel 2420 and the second circulation port 102 is easy to determine and convenient to align during the assembling process, and the rotation of the connecting frame 222, the connecting sleeve 221 and the valve core sleeve 242 relative to the valve body 10 can be limited after the assembling process.

In a further scheme, in order to facilitate the disassembly, assembly and maintenance of parts installed in the valve body 10 in the using process, the flow control valve is further provided with a mechanism convenient to disassemble and assemble. As shown in fig. 1, 8 and 10. The coupling component 22 further includes a nut sleeve 224, the nut sleeve 224 including a first ledge 2241 and a threaded portion 2242 disposed substantially perpendicular to the first ledge 2241. The first connecting part 2241 includes a fourth through hole 2243, the side protrusion 2223 of the connecting bracket 222 is located outside the connecting sleeve 221, a lower end surface of the first connecting part 2241 is connected to an upper end surface of the side protrusion 2223, a lower end surface of the side protrusion 2223 is connected to an upper end surface of the valve body 10, and the nut housing 224 is screwed to the outer wall of the valve body 10 by a screw part 2242. When maintenance or replacement is needed, after the threaded connection between the nut sleeve 224 and the valve body 10 is released, the components arranged in the valve body 10 except for the second sealing element 11 can be taken out at one time, and the disassembly is convenient. Furthermore, the nut sleeve 224 is sleeved outside the housing 2111, and the diameter of the fourth through hole 2243 of the nut sleeve 224 is smaller than the diameter of the outer edge of the side protrusion 2223 of the connecting frame 222, so that the nut sleeve 224 is limited by the housing part 211 and the connecting frame 222 after being detached from the valve body 10, is not easy to lose, and is convenient to connect with the valve body 10 again.

As shown in fig. 1 and 3, due to the above-mentioned easy-to-detach mechanism, in order to improve, in particular, to prevent the flow control valve from leaking, a static seal member 225 is disposed between the inner wall of the valve body 10 and the connection sleeve 221, specifically, the outer peripheral wall of the connection sleeve 221 is provided with a first annular projection 2211 and a second annular projection 2212 at intervals, the static seal member 225 is disposed between the first annular projection 2211 and the second annular projection 2212, the outer edge of the static seal member 225 abuts against the inner wall of the valve body 10, and the inner edge of the static seal member 225 abuts against the outer wall of the connection sleeve 221.

FIG. 11 is a schematic structural view of a second embodiment of a flow control valve according to the present invention, and FIG. 12 is a view showing I in FIG. 11 ₃ Schematic view of a partial structure of (a). As shown in the drawings, the flow control valve of the present embodiment differs from the first embodiment mainly in the different points related to the installation positioning structure of the second seal. Other points of common with the first embodiment can be understood by referring to the description of the first embodiment.

As shown in fig. 11 and 12, the valve seat member 241 includes the second seal member 11', the valve body 10' includes the inner support portion 110', the inner support portion 110' includes the second annular groove portion 101', the second annular groove portion 101' includes the second inner wall portion 1011' and the second outer wall portion 1012', the second seal member 11' is specifically an O-ring, the second seal member 11' is placed in the second annular groove portion 101', the lower end surface of the valve seat 241 abuts against the second inner wall portion 1011', the second seal member 11' and the second outer wall portion 1012', and the outer wall of the valve seat 241 is in clearance fit with the inner wall of the valve body 10 '. The beneficial effects are the same as those in the first demonstration example, and the description is not repeated here.

The following is a description of the method of assembling the flow control valve described below. It should be noted that the following step numbers are for convenience of description only and do not represent an inevitable order of assembly, and the order of steps, for example, step B, step C, and step D, may be changed to each other on the premise that the assembly of the flow control valve can be achieved.

Step A: preparing a valve body 10 from a copper material, forming external threads on the upper portion of the valve body 10, wherein the prepared valve body 10 includes a first circulation port and a second circulation port, and an insertion hole is formed in the upper end portion of the prepared valve body 10 as a first positioning portion 104; preparing a connecting sleeve 221 with an inner cavity; preparing a coupling frame 222 having a first through hole 2221, and processing a recess as a second positioning part 2224 at an outer wall of a side protrusion 2223 of the coupling frame 222; preparing a limiting member 223 having a limiting portion; preparing a valve core sleeve 242 with a flow regulating channel 2420; preparing a valve seat 241 having a valve seat opening 2411; preparing a nut 231; preparing a spool part 25 including a spool 251, preparing a case part 211 including a case 2111; a nut sleeve 224 having an internal thread is prepared. The housing 2111, the connecting frame 222, the limiting member 223, the connecting sleeve 221, the valve core sleeve 242 and the valve seat 241 are made of stainless steel materials.

And B: inserting the limiting member 223 into the first through hole 2221, and fixedly connecting the connecting frame 222, the limiting member 223 and the connecting sleeve 221 by furnace welding to form a first pre-assembly;

and C: welding and fixing the valve core sleeve 242 and the valve seat 241 by laser to form a second preassembled assembly;

step D: the nut 231 and the valve core part 25 are fixed by laser welding to form a third pre-assembly;

step E: assembling the third pre-assembly with the first pre-assembly, and then fixedly connecting the connecting sleeve 221 of the first pre-assembly with the valve core sleeve 242 of the second pre-assembly to form a valve assembly;

step F: the second packing 11/11 'is installed on the inner support portion 110/110' of the valve body 10, the valve assembly is partially inserted into the valve body cavity of the valve body 10 from the upper end of the valve body 10, the positioning member 12 is inserted into the first positioning portion 104 and is snapped into the second positioning portion 2224, and then the coupling bracket 222 and the valve body 10 are fixedly coupled by the nut housing 224.

According to the assembling method of the flow control valve, the connecting sleeve 221, the valve core sleeve 242 and the valve seat 241 are fixedly connected and then integrally installed in the valve body cavity of the valve body 10, the connecting sleeve 221 is not fixedly connected with the valve body 10, and the valve seat 241 is not fixedly connected with the valve body 10, so that the requirement on the machining precision of the valve body 10 is lowered. Furthermore, before the connecting frame 222, the connecting sleeve 221, the valve core sleeve 242 and the valve seat 241 are fixedly connected and then installed in the valve body cavity of the valve body 10, the valve core component 25, the connecting sleeve 221 and the connecting frame 222 are assembled first, the coaxiality between the valve core 251 and the connecting sleeve 221 of the valve core component 25 is relatively good, the valve core 251 and the connecting sleeve 221 are basically not affected by the machining precision of the valve body 10, and the matching reliability of the valve core 251 and the valve seat opening 2411 is improved.

The foregoing is merely an illustration of specific embodiments of the invention, and it should be understood that various modifications and adaptations of the invention may occur to those skilled in the art without departing from the spirit of the invention and should be considered within the scope of the invention.

Claims

1. The utility model provides a flow control valve, includes valve body subassembly, valve module, its characterized in that, the valve body subassembly includes valve body and setting element, the valve body includes first circulation mouth and second circulation mouth, the valve module includes control part, adapting unit, drive disk assembly, valve seat part and case part, the control part includes driver and output shaft, the case part includes the case, adapting unit includes link, nut cover, adapter sleeve, the adapter sleeve with link fixed connection, drive disk assembly include with output shaft threaded connection's nut, the case part with nut transmission is connected, the nut can drive the case part for adapter sleeve axial sliding so that the case with the sealing portion butt or the separation of valve seat part, the valve seat part includes valve seat, valve core cover, the valve seat include with the valve seat mouth of first circulation mouth intercommunication, the valve core cover with adapter sleeve fixed connection, the valve core cover includes the flow control passageway, the case part can for valve core cover axial sliding is in order to adjust the through-flow area of flow control passageway, the valve body includes first positioning portion, the link includes second positioning portion, with second positioning portion with the cooperation of valve body cover is connected through the nut connection.

2. The flow control valve according to claim 1, wherein the control member includes a housing member including a housing, the connection frame includes an upper protrusion located in an inner cavity of the housing, a side protrusion fixedly connected to the housing, the side protrusion located outside the connection sleeve, the nut sleeve includes a first overlapping portion and a threaded portion, a lower end of the first overlapping portion overlaps the side protrusion, and the nut sleeve is threadedly connected to an outer wall of the valve body through the threaded portion.

3. The flow control valve according to claim 2, wherein the first positioning portion includes an insertion hole, the second positioning portion includes a recess provided in an outer wall of the side protrusion, the positioning member is substantially columnar, the first land at least partially covers the positioning member, and a lower end surface of the first land abuts against an upper end surface of the side protrusion.

4. The flow control valve according to claim 2 or 3, wherein the connecting member further comprises a limiting member, the housing is welded and fixed to the connecting frame, the connecting frame is welded and fixed to the limiting member, the connecting sleeve is welded and fixed to the connecting frame, and the connecting sleeve is welded and fixed to the valve core sleeve or fixed to the valve core sleeve in a press-fitting manner.

5. The flow control valve according to claim 4, wherein the valve seat is welded and fixed with the valve core sleeve, a static sealing component is arranged between the inner wall of the valve body and the connecting sleeve, the outer edge of the static sealing component is abutted against the inner wall of the valve body, and the inner edge of the static sealing component is abutted against the connecting sleeve.

6. The flow control valve according to claim 5, wherein the housing, the connecting frame, the limiting member, and the connecting sleeve are fixed by furnace welding, the connecting sleeve and the valve core sleeve are fixed by laser welding, and the valve core sleeve and the valve seat are fixed by laser welding.

7. The flow control valve of claim 5, wherein the outer wall of the valve seat is in clearance fit with the inner wall of the valve body, the valve seat member includes a first sealing member fixedly connected to the valve seat, the first sealing member includes the sealing portion, the valve body assembly includes a second sealing member, the valve body includes an inner support portion, the inner support portion includes a first annular groove portion, the first annular groove portion includes a first inner wall portion and a first outer wall portion, the second sealing member is disposed in the first annular groove portion, the lower end surface of the valve seat abuts the upper end surface of the first inner wall portion and the second sealing member, and the outer wall of the valve seat is in clearance fit with the first outer wall portion.

8. The flow control valve of claim 4, wherein the outer wall of the valve seat is in clearance fit with the inner wall of the valve body, the valve seat member includes a first sealing member fixedly connected to the valve seat, the first sealing member includes the sealing portion, the valve body assembly includes a second sealing member, the valve body includes an inner support portion, the inner support portion includes a second annular groove portion, the second annular groove portion includes a second inner wall portion and a second outer wall portion, the second sealing member is disposed in the second annular groove portion, the lower end surface of the valve seat abuts the second inner wall portion, the second sealing member, and the second outer wall portion, and the outer wall of the valve seat is in clearance fit with the inner wall of the valve body.

9. The flow control valve according to claim 4, wherein the connecting member further comprises a limiting member, the connecting frame comprises a first through hole, the limiting member is at least partially located in the first through hole, the connecting frame is fixedly connected to the limiting member, the limiting member comprises a limiting portion, the limiting portion comprises a second through hole, the nut is at least partially located in the second through hole, the limiting portion limits circumferential rotation of the nut, the nut is axially movable relative to the limiting portion, and the lower end of the output shaft is in threaded connection with the nut.

10. The flow control valve according to claim 4, wherein the valve element further includes a movable sealing member, a base, and a connecting base, the valve element is substantially cylindrical, the connecting base is welded and fixed to the valve element, the connecting base is in threaded connection with the base, the base includes a second lap joint portion, the nut includes a supporting portion lapped with the second lap joint portion, the outer edge of the movable sealing member abuts against the inner wall of the connecting sleeve, the inner edge of the movable sealing member abuts against the connecting base, the valve seat member further includes a lining sleeve, the valve element sleeve includes a step surface facing the third step portion of the valve seat, the outer edge of the first sealing member of the valve seat member abuts against the step wall of the third step portion, the inner edge of the first sealing member abuts against the outer wall of the lining sleeve, and the upper end surface of the first sealing member abuts against the step surface of the third step portion.