CN115342210A

CN115342210A - One-way valve

Info

Publication number: CN115342210A
Application number: CN202110852095.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2021-05-14
Filing date: 2021-07-27
Publication date: 2022-11-15

Abstract

The application discloses check valve still includes disk seat, case and elastic component, the disk seat with the valve body welded fastening, the case with the elastic component is located the valve pocket of check valve, the case with the elastic component relatively fixed, the case with the disk seat butt, the case with the inner wall clearance sliding fit of valve body, the disk seat includes sealed face, the case can with sealed face butt or separation are in order to close or open the valve port of check valve, this check valve can improve the outer hourglass of check valve.

Description

One-way valve

Technical Field

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

Background

The check valve is mainly used for controlling the forward and reverse flow of fluid, is widely applied to systems such as refrigeration systems and the like, and is used for controlling the refrigerant in the system to flow only in a certain specified direction.

The check valve shown in fig. 1 includes a valve body 01 having a fluid inlet and a fluid outlet, and a valve seat 02 having a valve port is fixed to an inner cavity of the valve body 01; the poppet 05 can move away from or abut the valve port of the valve seat 02 to open or close the check valve. The check ring 06 is arranged and limited in the inner cavity of the valve body 01, the check ring 06 is used for limiting the maximum travel of the valve core 05 away from the valve port, the magnetic ring 04 made of magnetic materials is sleeved on the valve seat 02, the magnetic ring 04 enables the valve core 05 to move towards the valve port of the valve seat 02 to be attracted with the valve port, when the valve core 05 is attracted with the valve seat 02, the check valve is closed, and when the valve core 05 is separated from the valve seat 02, the check valve is opened. The valve body 01 is a copper cylindrical structure, and the valve body 01 is grooved for limiting the valve seat 02 and the check ring 06, but the risk of being notched or broken exists when the valve body 01 is grooved, so that the risk of leakage exists in the check valve.

Disclosure of Invention

An object of the application is to provide a check valve, including the valve body, still include disk seat, case and elastic component, the disk seat with the valve body welded fastening, the case with the elastic component is located the valve pocket of check valve, the case with the elastic component relatively fixed, the case with the disk seat butt, the case with the inner wall clearance sliding fit of valve body, the disk seat includes sealed face, the case can with sealed face butt or separation are in order to close or open the valve port of check valve, this application can improve the outer hourglass of check valve.

Drawings

FIG. 1 is a schematic structural diagram of a check valve of the prior art;

FIG. 2 is a schematic structural diagram of a first embodiment of a check valve according to the present invention;

FIG. 3 is a perspective view of the valve seat of FIG. 2 in one orientation;

FIG. 4 is a perspective view of the valve seat of FIG. 2 in yet another orientation;

FIG. 5 is a perspective view of the valve cartridge of FIG. 2;

FIG. 6 is a schematic view of the valve cartridge and valve body of FIG. 2 in mating relationship;

FIG. 7 is a schematic view of a check valve according to a second embodiment of the present application;

FIG. 8 is a schematic view of a third embodiment of the present application showing a check valve;

fig. 9 is a schematic structural view of a check valve according to a fourth embodiment of the present application.

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. 2 is a schematic structural diagram of a check valve according to a first embodiment of the present invention. FIG. 3 is a perspective view of the valve seat of FIG. 2 in one orientation; fig. 4 is a perspective view of the valve seat of fig. 2 in yet another orientation. The check valve of the embodiment comprises a valve body 1, a valve seat 2, a connecting piece 3, a valve core 4, an elastic piece 5, a filtering piece 6, a first connecting pipe 7 and a second connecting pipe 8.

As shown in fig. 2 and 3, the valve body 1 is made of a steel pipe, and the valve body 1 has a cylindrical shape and a hollow cylindrical structure when used as a component. The valve seat 2 and the connecting piece 3 are formed by punching plates or reducing pipes. The valve seat 2 and the connecting piece 3 are annular when being used as parts, the valve seat 2 and the connecting piece 3 are at least partially positioned in the valve body 1, the valve core 4 and the elastic piece 5 are positioned in a valve cavity of the one-way valve, and the valve core 4 and the elastic piece 5 are relatively fixed, namely the valve core 4 is displaced along with the deformation of the elastic piece 5, but the two are not separated from each other. The valve seat 2 comprises a first section 21, a second section 22 and a third section 23 located between the first section 21 and the second section 22. The first and

second sections

21 and 22 are annular.

The outer diameter of the second section 22 is larger than the outer diameter of the first section 21 and the inner diameter of the second section 22 is larger than the inner diameter of the first section 21. The second section 22 is welded to the valve body 1. The first section 21 includes a valve port 210, and an end surface 211 of the first section 21 away from the second section 22 is ground by a grinding process to serve as a sealing surface for matching with the valve element 4.

The third section 23 is a circular sheet, and the third section 23 includes a first position-limiting portion 231, where the first position-limiting portion 231 is disposed in a plane and is substantially perpendicular to the valve body 1. One end, close to the first connecting pipe 7, of the second connecting pipe 8 extends into the second section 22, the inner wall of the second section 22 is matched with part of the outer wall of the second connecting pipe 8, the first limiting part 231 of the third section 23 can limit the position, inserted into the second section 22, of the second connecting pipe 8, and when the second connecting pipe 8 is abutted to the first limiting part 231, the second connecting pipe 8 is limited.

The connection element 3 comprises a fourth segment 31, a fifth segment 32 and a sixth segment 33 located between the fourth segment 31 and the fifth segment 32. The outer diameter of the fifth section 32 is larger than the outer diameter of the fourth section 31, and the inner diameter of the fifth section 32 is larger than the inner diameter of the fourth section 31. Fifth section 32 and valve body 1 welded fastening, the one end that is close to second takeover 8 of first takeover 7 stretches into in fifth section 32, and the inner wall of fifth section 32 and the cooperation of the partial outer wall of first takeover 7, sixth section 33 include the spacing portion 331 of second, and the spacing portion 331 of second includes spacing terminal surface 3311, and spacing terminal surface 3311 is towards first takeover 7, and it is the vertical setting with valve body 1 roughly. The second limiting portion 331 of the sixth section 33 can limit the position where the first connecting pipe 7 is inserted into the fifth section 32, and when the first connecting pipe 7 abuts against the second limiting portion 331, the first connecting pipe 7 is limited. The second position-limiting portion 331 further includes a supporting end surface 3312. The fourth section 31 is located inside the elastic member 5 and guides the elastic member 5, i.e. the elastic member 5 partially overlaps the fourth section 31. The elastic member 5 is specifically a spring 5 in this embodiment, and a end of the spring 5 close to the first connecting pipe 7 is sleeved on the outer peripheral portion of the fourth section 31 and abuts against the supporting end surface 3312, so that the fourth section 31 can play a certain guiding role for the spring 5, and the sixth section 33 plays a supporting role for the spring 5.

The valve core 4 is formed by a metal material through a stamping process, and the valve core 4 is sheet-shaped in the embodiment. As shown in fig. 5, the valve core 4 further includes more than one flow channel, in this embodiment, the flow channel is more than one notch 41, the notches 41 are recessed from the side edge of the valve core 4 toward the center of the valve core 4, and the notches 41 may be even number in the circumferential direction of the valve core 4 and uniformly distributed in the circumferential direction, which is beneficial to the stability of fluid flow. Each adjacent notch 41 comprises a pawl part 42, the number of the pawl parts 42 corresponds to the number of the notches 41, each pawl part 42 comprises an arc-shaped edge part 421 matched with the valve body 1, and each edge part 421 is in clearance sliding fit with the inner wall of the valve body 1. During machining, each side portion 421 is a circular arc on a concentric circle, so that each side portion 421 and the valve body 1 have a good guiding fit relation. The material used for the first adapter tube 7 and the second adapter tube 8 can be red copper, 304 stainless steel or 20# steel, etc. according to the requirement. When the valve core 4 is processed, the end face of the valve core 4 for sealing and matching with the valve port 210 is ground to be used as a sealing face, so that the sealing reliability of the valve core 4 and the valve port 210 is improved, and internal leakage is improved.

The manufacturing method of the check valve comprises the following steps:

step A1, preparing a valve body 1, a valve seat 2, a connecting piece 3, a valve core 4, a spring 5, a first connecting pipe 7 and a second connecting pipe 8. In this embodiment, the valve body 1, the valve seat 2, the connecting member 3, and the valve element 4 are made of steel such as stainless steel. Compared with copper materials, the material cost can be saved, and when the check valve with smaller specification is prepared, the check valve is also convenient to process and good in reliability.

Step A2, assembling a first assembly: and welding the valve seat 2 and the second connecting pipe 8, specifically, after the valve seat 2 and the second connecting pipe 8 are pressed and mounted, furnace welding is performed on the valve seat 2 and the second connecting pipe 8, and the end face 211 of the valve seat 2 is ground to enable the end face 211 to be a sealing surface matched with the valve core 4.

The first assembly may also comprise a filter element 6. Specifically, the filter member 6 includes a fixing portion 61 and a filter portion 62. The filter part 62 is of a bowl-shaped structure, and the fixing part 61 is arranged at the opening end of the filter part 62 in a flanging mode. After the fixing portion 61 of the filter member 6 is seated on the first limiting portion 231 and fixed to the valve seat 2 by resistance welding, the fixing portion 61 and the valve seat 2 as a whole extend into the valve seat 2, so that the fixing portion 61 is located between the first limiting portion 221 and the end face of the second connection pipe 8, that is, the second connection pipe 8 is indirectly abutted against the first limiting portion 221, and then the second connection pipe 8 is furnace-welded to the valve seat 2.

Step A3, assembling a second assembly: the first connecting pipe 7 and the connecting piece 3 are welded and fixed after being pressed and mounted, and particularly when the first connecting pipe 7 is made of copper, the first connecting pipe and the connecting piece can be welded in a furnace.

And A4, assembling a valve body assembly, and welding and fixing the valve body 1 and the connecting piece 3 of the second assembly, wherein the valve body 1 and the connecting piece 3 can be made of steel, and the valve body 1 and the connecting piece 3 are welded and fixed through laser welding.

And step A5, assembling a third assembly, sequentially installing the spring 5 and the valve core 4 into the valve body assembly, and sleeving one end, close to the first connecting pipe, of the spring 5 on the periphery of the fourth section 31 of the connecting piece 3.

And step A6, press-fitting the valve seat 2 of the first assembly and the valve body 1 of the valve body assembly, and welding and fixing the valve body 1 and the valve seat 2. The valve seat 2 and the valve body 1 can be welded and fixed by laser welding.

The above steps A1-A6 do not represent the necessary assembly sequence of the check valves, i.e. there is no limitation to the assembly sequence of the check valves, but only an illustration of one specific embodiment. For example, the first adapter 7 may not be prepared before step A2, but step A4 may be prepared before step A3. The check valve of the present embodiment may not be provided with the filter member 6, and in this case, the assembly of the filter member 6 may be omitted. Alternatively, the filter element 6 can also be welded to the connecting element 3 as shown in fig. 7 below.

Fig. 7 is a schematic structural diagram of a check valve according to a second embodiment of the present invention, in which the structure of each component of the check valve is unchanged from that of the check valve according to the first embodiment, but the matching relationship between the components is changed, and the assembling method includes the following steps:

step A1, preparing a valve body 1, a valve seat 2, a connecting piece 3, a valve core 4, a spring 5, a first connecting pipe 7 and a second connecting pipe 8.

Step A2, assembling a first assembly: and welding the valve seat 2 and the second connecting pipe 8, specifically, after the valve seat 2 and the second connecting pipe 8 are pressed and mounted, furnace welding is performed on the valve seat 2 and the second connecting pipe 8, and then the end face 211 of the valve seat 2 is ground to enable the end face 211 to be a sealing surface matched with the valve core 4. Of course, here, the end surface 211 of the valve seat 2 may be ground and then the valve seat 2 and the second connection pipe 8 may be welded and fixed.

The second assembly may also include a filter element 6. Specifically, the filter member 6 includes a fixing portion 61 and a filter portion 62. The filter part 62 is of a bowl-shaped structure, and the fixing part 61 is arranged at the opening end of the filter part 62 in a flanging mode. The fixing portion 61 of the filter member 6 may be seated on the first limiting portion 231 and fixed to the valve seat 2 by resistance welding, and then, one end of the first connection pipe 7 close to the second connection pipe 8 is inserted into the connecting member 3, and the first connection pipe 7 is furnace-welded to the connecting member 3.

And A4, assembling a valve body assembly, and fixing the valve body 1 and the connecting piece 3 of the second assembly by laser welding.

And step A5, assembling a third assembly, successively installing the spring 5 and the valve core 4 into the valve body assembly, sleeving one end of the spring 5 close to the first connecting pipe 7 on the periphery of the fourth section 31 of the connecting piece 3, abutting against the second limiting part 331 of the sixth section 33 or abutting against the fixing part 61 of the filter piece 6, and matching one end of the spring 5 close to the second connecting pipe 8 with the valve core 4.

And step A6, press-fitting the valve seat 2 of the first assembly and the valve body 1 of the valve body assembly, welding and fixing the valve body 1 and the valve seat 2, and welding and fixing the valve body 1 and the valve seat 2 through laser welding.

The steps A1 to A6 do not represent the necessary assembly sequence of the check valves, i.e. there is no limitation to the assembly sequence of the check valves, but only an illustration of a specific embodiment. For example, the first adapter 7 may be prepared not necessarily before step A2, but step A3 may be before step A2.

The assembly method of the check valve with the structure shown in FIG. 7 can also be as follows:

Step A2, assembling a first assembly: and after the valve seat 2 and the second connecting pipe 8 are pressed and assembled, furnace welding is carried out on the valve seat and the second connecting pipe. After that, the end surface 211 of the valve seat 2 is polished so that the end surface 211 can be a sealing surface to be engaged with the valve element 4.

Step A3, assembling a second assembly: and (3) press-fitting the first connecting pipe 7 and the connecting piece 3, and then performing furnace welding on the first connecting pipe and the connecting piece.

The second assembly may also include a filter element 6. Specifically, the filter member 6 includes a fixing portion 61 and a filter portion 62. The filter part 62 is of a bowl-shaped structure, and the fixing part 61 is arranged at the opening end of the filter part 62 in a flanging mode. The fixing portion 61 of the filter member 6 may be seated on the first limiting portion 231 and fixed to the valve seat 2 by resistance welding, and then, one end of the first connection pipe 7 close to the first connection pipe extends into the connecting member 3, and the first connection pipe 7 is furnace-welded to the connecting member 3.

And step A4, assembling a valve body assembly, and welding and fixing the valve body 1 and the valve seat 2 of the first assembly by laser welding.

And step A5, assembling a third assembly, and sequentially installing the valve core 4 and the spring 5 into the valve body assembly to enable one end, close to the second connecting pipe 8, of the spring 5 to be matched with the valve core 4.

And step A6, press-fitting the connecting piece 3 of the second assembly with the valve body 1 of the valve body assembly, and welding and fixing the valve body 1 and the valve seat 2 through laser welding.

The steps A1 to A6 do not represent the necessary assembly sequence of the check valves, i.e. there is no limitation to the assembly sequence of the check valves, but only an illustration of a specific embodiment. For example, the first adapter 7 may not be prepared before step A2, but step A4 may be prepared before step A3.

Fig. 8 is a schematic structural view showing a third embodiment of the check valve of the present invention. The main difference between the check valve and the check valves of the first and second embodiments is the structure of the connecting member 3. In the present embodiment, the connecting member 3 includes a bottom portion 34 which is in abutting engagement with the first adapter 7, and two

wall portions

35 and 36 which are connected to the bottom portion 34, respectively. In this embodiment, the connecting member 3 is of an integral structure, i.e., the bottom portion 34 and the wall portions (the first wall portion 35 and the second wall portion 36) are integrally formed. The connecting piece 3 is in a structure with a circular groove, the longitudinal section of the valve body 1 is in two structures similar to a U shape, the first wall part 35 is positioned between the valve body 1 and the first connecting pipe 7, and the second wall part 36 is positioned on the inner side of the first connecting pipe 7. At this time, the surface of the bottom portion 34 facing the first connecting pipe 7 serves as a second stopper 331 for stopping the first connecting pipe 7, and the surface of the bottom portion 34 facing the second connecting pipe 8 serves as a support surface which can directly support the filter member 6, or which can directly or indirectly support the end of the spring 5 close to the first connecting pipe 7. The method of assembly of the check valve shown in fig. 8 is similar to the method of assembly of the check valve shown in fig. 7. As can be seen from the embodiment shown in fig. 7, in the check valve of the embodiment shown in fig. 8, the filter member 6 may be welded and fixed to the valve seat 2 as in the check valve shown in fig. 2.

Fig. 9 is a schematic structural view showing a check valve according to a fourth embodiment of the present invention.

As shown in the drawings, in the present embodiment, the structures of the valve body 1, the second connection pipe 8, the spring 5, the valve core 4 and the valve seat 2 are the same as those in the first embodiment, and in the check valve of the present embodiment, the first connection pipe 7 and the connection member 3 are an integrally formed structure, which is defined as a first component, thereby reducing one part. The first adapter tube 7 comprises a welding part 71 welded and fixed with the valve body 1, the first adapter tube 7 comprises a reducing part 72 and a transition part 73 positioned between the reducing part 72 and the welding part 71, and the outer diameter of the reducing part 72 is smaller than that of the welding part 71, so that the transition part 73 can support the spring 5. That is, one end of the spring 5 near the first adapter 7 abuts the transition portion 73. The end face of the transition portion 73 facing the spring 5 supports the spring 5 as a support surface.

The assembling method comprises the following steps of,

step A1, preparing a valve body 1, a valve seat 2, a valve core 4, a spring 5, a first connecting pipe 7 and a second connecting pipe 8.

Step A2, assembling a first assembly: and welding the valve seat 2 and the second connecting pipe 8, specifically, after the valve seat 2 and the second connecting pipe 8 are pressed and mounted, furnace welding and fixing are performed on the valve seat 2 and the second connecting pipe 8, and then, grinding the end face 211 of the valve seat 2 to enable the end face 211 to be a sealing face matched with the valve core 4. Of course, here, the end face 211 of the valve seat 2 may be ground first and then the valve seat 2 and the second connection pipe 8 may be welded and fixed.

The first assembly may also comprise a filter element 6. Specifically, the filter member 6 includes a fixing portion 61 and a filter portion 62. The filter part 62 is of a bowl-shaped structure, and the fixing part 61 is arranged at the opening end of the filter part 62 in a flanging mode. After the fixing portion 61 of the filter member 6 is located on the first limiting portion 231 and is fixed to the valve seat 2 by resistance welding, the fixing portion 61 and the valve seat 2 as a whole extend into the valve seat 2, so that the fixing portion 61 is located between the first limiting portion 221 and the end face of the second connecting pipe 8, that is, the second connecting pipe 8 is indirectly abutted to the first limiting portion 221, and then the second connecting pipe 8 is furnace-welded to the valve seat 2.

And step A4, assembling a valve body assembly, welding and fixing the valve body 1 and the valve seat 2 of the first assembly, and welding and fixing the valve body 1 and the valve seat 2 through laser welding.

And step A5, assembling a third assembly, and sequentially installing the valve core 4 and the spring 5 into the valve body assembly to enable one end, close to the first connecting pipe, of the spring 5 to be matched with the valve core 4.

And step A6, welding and fixing the valve body 1 of the valve body assembly and the first connecting pipe 7, and welding and fixing the valve body 1 and the first connecting pipe by laser welding.

The above steps A1-A6 do not represent the necessary assembly sequence of the check valves, i.e. there is no limitation to the assembly sequence of the check valves, but only an illustration of one specific embodiment. For example, the first adapter tube 7 may not be prepared before step A2, and the filter member 6 may not be installed in the assembling step.

The method of assembling the check valve shown in fig. 9 may further include:

The first assembly may also include a filter element 6. Specifically, the filter member 6 includes a fixing portion 61 and a filter portion 62. The filter part 62 is of a bowl-shaped structure, and the fixing part 61 is arranged by flanging the opening end of the filter part 62. After the fixing portion 61 of the filter member 6 is located on the first limiting portion 231 and is fixed to the valve seat 2 by resistance welding, the fixing portion 61 and the valve seat 2 as a whole extend into the valve seat 2, so that the fixing portion 61 is located between the first limiting portion 221 and the end face of the second connecting pipe 8, that is, the second connecting pipe 8 is indirectly abutted to the first limiting portion 221, and then the second connecting pipe 8 is furnace-welded to the valve seat 2.

And step A4, assembling the valve body assembly, and welding and fixing the valve body 1 and the first connecting pipe 7 by laser welding.

And step A5, assembling a third assembly, and sequentially installing the valve core 4 and the spring 5 into the valve body assembly, so that one end, close to the first connecting pipe 7, of the spring 5 is sleeved on the necking part 72 of the first connecting pipe 7.

And step A6, laser welding and fixing the valve body 1 of the valve body assembly and the valve seat 2 of the first assembly.

The steps A1 to A6 do not represent the necessary assembly sequence of the check valves, i.e. there is no limitation to the assembly sequence of the check valves, but only an illustration of a specific embodiment. For example, the first adapter tube 7 may not be prepared before the step A2, and the filter member 6 may not be installed in the assembling step.

After the one-way valve of each embodiment is assembled, as shown in fig. 6, after the one-way valve is assembled, the matching relationship between the valve core 4 and the valve body 1 is as shown in fig. 6, the inner wall of the valve body 1 is in small clearance fit with each edge 421 of the pawl part 42 of the valve core 4, and the single-side clearance is not more than 0.1mm. So that the valve body 1 provides guidance for the movement of the valve core 4 in the valve body 1, and the reliability of the matching of the valve core 4 and the sealing surface 211 of the valve seat 2 is improved. Each notch 41 serves as a flow channel. Here, it is understood that the valve body 4 may include one or more through holes not communicating with the edge of the valve body 4 as the flow passage. That is, after the valve body 4 is separated from the valve port, fluid can flow from one side of the valve body 4 to the other side of the valve body 4. In this embodiment, a port of the second connection pipe 8 at the end not connected to the valve body 1 is an inlet a, and a port of the first connection pipe 7 at the end not connected to the valve body 1 is an outlet B. The valve core 4 can abut against the sealing surface 211 of the valve seat 2 under the action of the elastic force of the spring 5 to close the valve port 210, and after the valve core 4 is separated from the sealing surface 211 of the valve seat 2 under the action of fluid pressure, the valve port 210 of the one-way valve is opened, and the first connecting pipe 7 and the second connecting pipe 8 can be communicated through the flow channel of the valve core 4.

Compared with the background art, the check valve with the structure has no notch structure, the leakage risk is improved, the structure and the processing technology of each part are simple, the assembly is convenient, and the miniaturization of the whole size of the check valve is facilitated.

The foregoing is merely an illustration of specific embodiments of this invention and it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and are intended to be within the scope of the invention.

Claims

1. The check valve comprises a valve body and is characterized by further comprising a valve seat, a valve core and an elastic piece, wherein the valve seat is welded and fixed with the valve body, the valve core and the elastic piece are located in a valve cavity of the check valve, the valve core and the elastic piece are fixed relatively, the valve core is in clearance sliding fit with the inner wall of the valve body, the valve seat comprises a sealing surface, and the valve core can be abutted against or separated from the sealing surface to close or open a valve port of the check valve.

2. The check valve of claim 1, wherein the valve body, the valve seat, and the valve element are made of steel, the valve body is tubular, the elastic member is a spring, the spring abuts against the valve element, the valve element is sheet-shaped, the valve element is located between the elastic member and the valve seat, and the valve element includes one or more notches or through holes.

3. The check valve according to claim 2, wherein the valve seat comprises a first section, a second section and a third section located between the first section and the second section, the first section is annular, the second section is annular, the third section is annular sheet-shaped, the outer diameter of the second section is larger than the outer diameter of the first section, the inner diameter of the second section is larger than the inner diameter of the first section, the second section is welded and fixed with the valve body, and the end face of the first section, which is far away from the second section, serves as the sealing face.

4. The check valve of claim 3, further comprising a first connecting pipe and a second connecting pipe, wherein the third section comprises a first limiting portion, and one end of the second connecting pipe, which is close to the first connecting pipe, abuts against the first limiting portion.

5. The check valve of any of claims 1-4, further comprising a connector, wherein the valve seat and the connector are at least partially located within the valve body, the valve seat is annular, the connector is welded to the valve body, one end of the spring directly or indirectly abuts the connector, and the other end of the spring abuts the valve element.

6. The check valve according to any one of claims 1 to 4, further comprising a connecting member, wherein the valve seat and the connecting member are at least partially located in the valve body, the valve seat is annular, the connecting member is welded to the valve body, the connecting member includes a fourth section, a fifth section, and a sixth section located between the fourth section and the fifth section, an outer diameter of the fifth section is greater than an outer diameter of the fourth section, an inner diameter of the fifth section is greater than an inner diameter of the fourth section, the fifth section is welded to the valve body, one end of the first connecting pipe close to the second connecting pipe is located in the fifth section, the sixth section includes a second limiting portion, the first connecting pipe abuts against the second limiting portion, the fourth section is located in the elastic member, and one end of the elastic member close to the first connecting pipe abuts against the second limiting portion.

7. The check valve of claim 5, wherein the first adapter is integrally formed with the connector to define a first member, the first member includes a weld secured to the valve body, the first member further includes a reduced diameter portion and a transition portion between the reduced diameter portion and the weld, the reduced diameter portion has an outer diameter smaller than an outer diameter of the weld, and the resilient member abuts the transition portion.

8. The check valve of any of claims 1-4, wherein the connector comprises a bottom and a first wall and a second wall, the first nipple abutting the bottom, the first wall being located between the valve body and the first nipple, the second wall being located inside the first nipple.

9. The check valve of claim 4, wherein the valve core is made of a metal material through stamping forming, the valve seat is connected with the second connecting pipe through furnace welding, the valve seat is connected with the valve body through furnace welding, the valve seat comprises a ground end face, the end face serves as the sealing face, and the valve core can be abutted to or separated from the end face.

10. The check valve according to claim 1, wherein the valve seat is ring-shaped, the check valve further comprises a connecting member, a filtering member, a first connecting pipe and a second connecting pipe, the valve element is made of metal materials through punch forming, the valve seat and the connecting member are at least partially located in the valve body, the valve seat is connected with the second connecting pipe through furnace welding, the valve seat is connected with the valve body through furnace welding, the valve seat comprises a ground end face, the valve element can be abutted against or separated from the end face, the end face serves as the sealing face, the connecting member is ring-shaped, the connecting member is welded and fixed with the valve body, the valve seat comprises a first section, a second section and a third section located between the first section and the second section, the first section is ring-shaped, the second section is ring-shaped, the third section is ring-shaped sheet, and the outer diameter of the second section is larger than the outer diameter of the first section, the inner diameter of the second section is larger than that of the first section, the second section is welded and fixed with the valve body, the end face, far away from the second section, of the first section is used as the sealing face, the third section comprises a first limiting portion, one end, close to the first connecting pipe, of the second connecting pipe is abutted to the first limiting portion, one end of the elastic piece is directly or indirectly abutted to the connecting piece, the other end of the elastic piece is abutted to the valve core, the connecting piece comprises a fourth section, a fifth section and a sixth section located between the fourth section and the fifth section, the outer diameter of the fifth section is larger than that of the fourth section, the inner diameter of the fifth section is larger than that of the fourth section, the fifth section is welded and fixed with the valve body, one end, close to the second connecting pipe, of the first connecting pipe is located in the fifth section, the sixth section comprises a second limiting part, the first connecting pipe is abutted to the second limiting part, the fourth section is located in the elastic piece, one end, close to the first connecting pipe, of the elastic piece is abutted to the second limiting part, and the filtering piece is welded and fixed with the connecting piece or the valve seat.