Check valve and electromagnetic valve with check valve

Abstract

The utility model discloses a check valve and an electromagnetic valve with the check valve. The check valve comprises a valve body and a check assembly. The valve body is provided with a valve body space, a water inlet channel, a water outlet channel and a mounting cavity, the water inlet channel and the water outlet channel are respectively communicated with the valve body space, the mounting cavity is communicated with the water outlet channel, and the inner diameter of the mounting cavity is larger than that of the water outlet channel, so that the valve body forms a binding surface at an opening of the water outlet channel; the non-return assembly is mounted in the mounting cavity of the valve body and comprises a non-return element, a pressure spring element and an assembling element, the outer diameter of the non-return element is smaller than the inner diameter of the mounting cavity of the valve body, the assembling element is provided with an element penetrating hole, the assembling element is fixedly mounted on the valve body, and the pressure spring element penetrates through the element penetrating hole. The two opposite ends of the compression spring element abut against the assembling element and the non-return element respectively, and the compression spring element presses the end face of the non-return element to the attaching face of the valve body.

Description

Technical Field

[0001] The utility model relates to the field of fluid control, and particularly relates to a check valve and a solenoid valve with a check valve. Background Art

[0002] In the Chinese utility model patent with the authorization announcement number of CN219571016U, the inventor discloses a solenoid valve, which includes a valve body and a flow control unit. The flow control unit can control the water outlet of the valve body to be in an open state or a closed state. When the flow control unit controls the water outlet of the valve body to be in an open state, water is allowed to flow out through the water outlet of the valve body. When the flow control unit controls the water outlet of the valve body to be in a closed state, water is blocked from flowing out through the water outlet of the valve body. During the actual use of the solenoid valve, the inventor found that due to the structural characteristics of the solenoid valve, specifically the structural characteristics of the flow control unit, when the water pressure on one side of the water outlet of the valve body is relatively large, a backflow problem is likely to occur. If the solenoid valve is applied to a water purifier, once backflow occurs, it will inevitably cause the water on the water source side to be polluted, posing a hygiene hazard. Summary of the Utility Model

[0003] An object of the present utility model is to provide a check valve and a solenoid valve with a check valve, wherein the check component of the check valve can effectively solve the backflow problem.

[0004] According to an aspect of the present utility model, the present utility model provides a check valve, which includes:

[0005] A valve body, wherein the valve body has a valve body space, a water inlet channel, a water outlet channel and an installation cavity. The water inlet channel and the water outlet channel are respectively communicated with the valve body space. The installation cavity is communicated with the water outlet channel, and the inner diameter size of the installation cavity is larger than the inner diameter size of the water outlet channel, so that the valve body forms a fitting surface at the opening of the water outlet channel; and

[0006] A check component, wherein the check component is installed in the installation cavity of the valve body. The check component includes a check element, a compression spring element and an assembly element. The outer diameter size of the check element is smaller than the inner diameter size of the installation cavity of the valve body. The assembly element has at least one element through hole. The assembly element is fixedly installed on the valve body. The opposite ends of the compression spring element respectively abut against the assembly element and the check element, and the end surface of the check element is pressed against the fitting surface of the valve body by the compression spring element.

[0007] In an optional example of the present utility model, the fitting surface of the valve body surrounds the periphery of the opening of the water outlet channel.

[0008] In an alternative example of the present utility model, the opposite ends of the compression spring element are respectively mounted on the anti-reverse element and the assembly element.

[0009] In an alternative example of the present utility model, the anti-reverse element has a first mounting post, the assembly element has a second mounting post, one end of the compression spring element is sleeved on the first mounting post of the anti-reverse element, and the other end of the compression spring element is sleeved on the second mounting post of the assembly element.

[0010] In an alternative example of the present utility model, the anti-reverse element has a first mounting post, the assembly element has a second mounting post. In the natural state, the inner diameter dimension of one end of the compression spring element is slightly smaller than the outer diameter dimension of the first mounting post of the anti-reverse element, so that this end of the compression spring element is sleeved on the first mounting post in a manner of being bound to the first mounting post of the anti-reverse element. The inner diameter dimension of the other end of the compression spring element is slightly smaller than the second mounting post of the assembly element, so that this end of the compression spring element is sleeved on the second mounting post in a manner of being bound to the second mounting post of the assembly element.

[0011] In an alternative example of the present utility model, the assembly element is clamped on the valve body.

[0012] In an alternative example of the present utility model, the assembly element is screwed on the valve body.

[0013] In an alternative example of the present utility model, the valve body has an annular clamping groove, the clamping groove communicates with the installation cavity, the outer end of the assembly element has a snap ring, the snap ring protrudes from the outer peripheral wall of the assembly element, and the snap ring of the assembly element is snapped into the clamping groove of the valve body so that the assembly element is clamped on the valve body.

[0014] In an alternative example of the present utility model, the assembly element has a groove, the groove extends from the outer end face towards the inner end direction, the snap ring surrounds the groove, and the surface of the snap ring facing the inner end of the assembly element is an inclined surface.

[0015] In an alternative example of the present utility model, the valve body has a first wall, a second wall and a third wall, the first wall and the third wall face each other, the second wall connects the first wall and the third wall to define the clamping groove by the first wall, the second wall and the third wall, the third wall of the valve body is adjacent to the outer end face of the assembly element, and the third wall is an inclined surface.

[0016] In another aspect of the present utility model, the present utility model further provides a solenoid valve with a check valve, which includes a check valve and a flow control unit disposed on the check valve, wherein the check valve includes:

[0017] A valve body, wherein the valve body has a valve body space, a water inlet passage, a water outlet passage and a mounting cavity, the water inlet passage and the water outlet passage are respectively communicated with the valve body space, the mounting cavity is communicated with the water outlet passage, and the inner diameter of the mounting cavity is larger than the inner diameter of the water outlet passage, so that the valve body forms a fitting surface at the opening of the water outlet passage; and

[0018] A check valve assembly, wherein the check valve assembly is installed in the mounting cavity of the valve body, the check valve assembly includes a check valve element, a compression spring element and an assembly element, the outer diameter of the check valve element is smaller than the inner diameter of the mounting cavity of the valve body, the assembly element has at least one element through hole, the assembly element is fixedly installed on the valve body, and the opposite ends of the compression spring element respectively abut against the assembly element and the check valve element, and the end surface of the check valve element is pressed against the fitting surface of the valve body by the compression spring element, wherein the flow control unit controls the communication state between the valve body space and the water outlet passage of the valve body. Description of the Drawings

[0019] Figure 1 is a schematic cross-sectional view of a state of a solenoid valve with a check valve according to a preferred embodiment of the present utility model.

[0020] Figure 2 is a schematic cross-sectional view of another state of the solenoid valve according to the above preferred embodiment of the present utility model.

[0021] Figure 3 is a three-dimensional schematic view of a perspective of a check valve of the solenoid valve according to the above preferred embodiment of the present utility model.

[0022] Figure 4 is a three-dimensional schematic view of another perspective of the check valve of the solenoid valve according to the above preferred embodiment of the present utility model.

[0023] Figure 5 is an exploded schematic view of a perspective of the check valve of the solenoid valve according to the above preferred embodiment of the present utility model.

[0024] Figure 6 is an exploded schematic view of another perspective of the check valve of the solenoid valve according to the above preferred embodiment of the present utility model.

[0025] Figure 7It is a cross-sectional schematic view of a perspective of the check valve of the solenoid valve according to the above-mentioned preferred embodiment of the present utility model.

[0026] Figure 8 It is a cross-sectional schematic view of another perspective of the check valve of the solenoid valve according to the above-mentioned preferred embodiment of the present utility model.

[0027] Figure 9 is Figure 8 a partial position enlarged view of. Detailed implementation manners

[0028] Before detailing any embodiment of the present utility model, it should be understood that the present utility model is not limited in its application to the details of the construction and arrangement of the components described in the following description or illustrated in the following drawings. The present utility model is capable of other embodiments and of being practiced or carried out in various ways. Additionally, it should be understood that the language and terminology used herein are for the purpose of description and should not be regarded as restrictive. As used herein, the terms "including" or "having" and their variants are intended to cover the listed items and their equivalents as well as additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and their variants are used broadly and cover both direct and indirect mounting, connection, support and coupling. Further, "connected" and "coupled" are not limited to physical or mechanical connection or coupling.

[0029] And, on the one hand, in the disclosure of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model; on the other hand, the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0030] Referring to the specification drawings of the present utility model Figures 1 to 9, a solenoid valve with a check valve (hereinafter referred to as "solenoid valve") according to a preferred embodiment of the present utility model will be disclosed and described hereinafter, wherein the solenoid valve includes a check valve 10 and a flow control unit 20 disposed on the check valve 10, and the flow control unit 20 is used to control the state of water flowing from the water inlet of the check valve 10 to the water outlet, and when the flow control unit 20 prevents water from flowing from the water inlet of the check valve 10 to the water outlet, the check valve 10 is used to prevent water from flowing back.

[0031] Specifically, the check valve 10 includes a valve body 11, the valve body 11 has a valve body space 111, a water inlet channel 112 and a water outlet channel 113, and the water inlet channel 112 and the water outlet channel 113 are respectively communicated with the valve body space 111. The flow control unit 20 is installed on the valve body 11, and the flow control unit 20 is used to control the communication state between the valve body space 111 of the valve body 11 and the water outlet channel 113. When the flow control unit 20 controls the communication between the valve body space 111 of the valve body 11 and the water outlet channel 113, water is allowed to enter the valve body space 111 through the water inlet channel 112 of the valve body 11 and enter the water outlet channel 113 from the valve body space 111, so that the flow control unit 20 controls water to flow from the water inlet of the check valve 10 to the water outlet. When the flow control unit 20 controls the valve body space 111 of the valve body 11 and the water outlet channel 113 not to communicate, water is allowed to enter the valve body space 111 through the water inlet channel 112 of the valve body 11, so that the flow control unit 20 prevents water from flowing from the water inlet of the check valve 10 to the water outlet.

[0032] Appendix Figure 1 and Figure 2A specific example of the flow control unit 20 shown has a specific structure consistent with that of the flow control unit disclosed by the inventor in the Chinese utility model patent with the authorization announcement number CN219571016U. The flow control unit 20 includes an assembly column 21, a magnetizable part 22, a magnetic flow control part 23, a return spring 24, and a coil part 25. The assembly column 21 has an assembly space 211 and a bottom opening 212 communicating with the assembly space 211. The magnetizable part 22 is fixedly arranged at the top of the assembly column 21. The top of the magnetic flow control part 23 is movably arranged in the assembly space 211 of the assembly column 21 through the bottom opening 212 of the assembly column 21. The return spring 24 is sleeved on the bottom of the magnetic flow control part 23, and the opposite ends of the return spring 24 respectively abut against the assembly column 21 and the top of the magnetic flow control part 23. The coil part 25 includes a bracket 251 and a coil 252 wound around the bracket 251. The bracket 251 is sleeved on the top of the assembly column 21. The bottom of the assembly column 21 is assembled to the valve body 11. The bottom of the magnetic flow control part 23 is movably held in the valve body space 111 of the valve body 11, and the bottom of the magnetic flow control part 23 can prevent the valve body space 111 of the valve body 11 from communicating with the water outlet channel 113.

[0033] Specifically, when starting to supply power to the coil 252 of the coil part 25, the magnetizable part 22 is magnetized to adsorb the magnetic flow control part 23 to move upward. At this time, the bottom of the magnetic flow control part 23 allows the valve body space 111 of the valve body 11 to communicate with the water outlet channel 113. Thus, water is allowed to enter the valve body space 111 through the water inlet channel 112 of the valve body 11 and enter the water outlet channel 113 from the valve body space 111. Thus, the flow control unit 20 controls the water to flow from the water inlet of the check valve 10 to the water outlet direction. At the same time, the magnetic flow control part 23 compresses the return spring 24 in the direction towards the assembly column 21, so that the return spring 24 deforms to store elastic potential energy. When stopping supplying power to the coil 252 of the coil part 25, the magnetizable part 22 is demagnetized. When the return spring 24 returns to its initial state, it pushes the magnetic flow control part 23 to move downward. At this time, the bottom of the magnetic flow control part 23 prevents the valve body space 111 of the valve body 11 from communicating with the water outlet channel 113. Thus, water is allowed to enter the valve body space 111 through the water inlet channel 112 of the valve body 11. Thus, the flow control unit 20 prevents the water from flowing from the water inlet of the check valve 10 to the water outlet direction.

[0034] In the solenoid valve of the present utility model, the valve body 11 has an installation cavity 114, and the installation cavity 114 communicates with the water outlet channel 113. The check valve 10 further includes a check component 12, and the check component 12 is installed in the installation cavity 114 of the valve body 11. When the bottom of the magnetic flow control part 23 allows the valve body space 111 of the valve body 11 to communicate with the water outlet channel 113, the water flowing through the water outlet channel 113 of the valve body 11 can further flow through the check component 12. When the bottom of the magnetic flow control part 23 prevents the valve body space 111 of the valve body 11 from communicating with the water outlet channel 113, the check component 12 is used to prevent the water from flowing back, that is, the check component 12 is used to prevent the water from flowing from the water outlet of the check valve 10 towards the water inlet direction.

[0035] Specifically, the inner diameter dimension of the installation cavity 114 of the valve body 11 is larger than the inner diameter dimension of the water outlet channel 113, so that the valve body 11 forms a fitting surface 115 at the opening of the water outlet channel 113. The check component 12 includes a check element 121, a compression spring element 122 and an assembly element 123. The outer diameter dimension of the check element 121 is smaller than the inner diameter dimension of the installation cavity 114 of the valve body 11. The assembly element 123 has at least one element through hole 1231, and the assembly element 123 is fixedly installed on the valve body 11. The opposite ends of the compression spring element 122 respectively abut against the assembly element 123 and the check element 121, and the compression spring element 122 presses the end face of the check element 121 against the fitting surface 115 of the valve body 11.

[0036] When the bottom of the magnetic flow control part 23 allows the valve body space 111 of the valve body 11 to communicate with the water outlet channel 113, as the water pressure in the water inlet channel 112 of the valve body 11 increases, the check element 121 is pushed to move towards the direction close to the assembly element 123, so that a gap 100 is generated between the end face of the check element 121 and the fitting surface 115 of the valve body 11. At this time, water is allowed to enter the installation cavity 114 of the valve body 11 through the gap 100 and flow out through the element perforation 1231 of the assembly element 123. It can be understood that after the check element 121 moves towards the direction close to the assembly element 123, the compression spring element 122 is compressed to store elastic potential energy. When the bottom of the magnetic flow control part 23 prevents the valve body space 111 of the valve body 11 from communicating with the water outlet channel 113, during the process of the compression spring element 122 restoring to its initial state, it pushes the check element 121 to move towards the direction away from the assembly element 123 and presses the end face of the check element 121 against the fitting surface 115 of the valve body 11. At this time, the gap 100 disappears to achieve the check function. Preferably, the compression spring element 122 can be a plastic compression spring.

[0037] Preferably, the fitting surface 115 of the valve body 11 surrounds the opening of the water outlet channel 113. In this way, it is beneficial to improve the check effect of the check valve 10.

[0038] In the Figures 1 to 9 specific example of the solenoid valve shown, the opposite ends of the compression spring element 122 are respectively installed on the check element 121 and the assembly element 123. In this way, when the check assembly 12 is not installed in the installation cavity 114 of the valve body 11, the check element 121, the compression spring element 122 and the assembly element 123 can be an integral body, which is beneficial to the assembly of the valve body 11 and the check assembly 12.

[0039] Specifically, the check element 121 has a first mounting post 1211, and the assembly element 123 has a second mounting post 1232. In the natural state, the inner diameter dimension of one end of the compression spring element 122 is slightly smaller than the outer diameter dimension of the first mounting post 1211 of the check element 121. Thus, after the first mounting post 1211 of the check element 121 is inserted into this end of the compression spring element 122, this end of the compression spring element 122 is sleeved on the first mounting post 1211 in a manner of being constrained by the first mounting post 1211 of the check element 121, for realizing the installation of the compression spring element 122 and the check element 121. The inner diameter dimension of the other end of the compression spring element 122 is slightly smaller than the second mounting post 1232 of the assembly element 123. Thus, after the second mounting post 1232 of the assembly element 123 is inserted into this end of the compression spring element 122, this end of the compression spring element 122 is sleeved on the second mounting post 1232 in a manner of being constrained by the second mounting post 1232 of the assembly element 123. Through the above structure and assembly method, the opposite ends of the compression spring element 122 can be reliably installed on the check element 121 and the assembly element 123, so that the check element 121, the compression spring element 122 and the assembly element 123 are combined into a whole.

[0040] When assembling the valve body 11 and the check assembly 12, first, the check element 121 is allowed to be inserted into the installation cavity 114 of the valve body 11. Second, the assembly element 123 is inserted into the installation cavity 114 of the valve body 11. After the assembly element 123 and the valve body 11 are fixed, the assembly element 123 and the compression spring element 122 can press the end face of the check element 121 against the fitting surface 115 of the valve body 11. During use, the first mounting post 1211 of the check element 121 and the second mounting post 1232 of the assembly element 123 can ensure that the compression spring element 122 is reliably held between the check element 121 and the assembly element 123, so as to ensure the reliability of the solenoid valve.

[0041] Optionally, in other examples of the solenoid valve of the present utility model, the outer diameter dimension of the first mounting post 1211 of the check element 121 may also be smaller than the inner diameter dimension of the corresponding end of the compression spring element 122. In this case, after the end of the compression spring element 122 is sleeved on the first mounting post 1211 of the check element 121, although the end of the compression spring element 122 cannot bind the first mounting post 1211 of the check element 121, the first mounting post 1211 of the check element 121 can ensure that the end of the compression spring element 122 abuts against the check element 121. Correspondingly, the outer diameter dimension of the second mounting post 1232 of the assembly element 123 may also be smaller than the inner diameter dimension of the corresponding end of the compression spring element 122. In this case, after the end of the compression spring element 122 is sleeved on the second mounting post 1232 of the assembly element 123, although the end of the compression spring element 122 cannot bind the second mounting post 1232 of the assembly element 123, the second mounting post 1232 of the assembly element 123 can ensure that the end of the compression spring element 122 abuts against the assembly element 123. During use, the first mounting post 1211 of the check element 121 and the second mounting post 1232 of the assembly element 123 can ensure that the compression spring element 122 is reliably held between the check element 121 and the assembly element 123 to ensure the reliability of the solenoid valve.

[0042] In the Figures 1 to 9 In this specific example of the solenoid valve of the present utility model shown in the accompanying drawings, the assembly element 123 is snap-fitted to the valve body 11 to mount the check assembly 12 in the mounting cavity 114 of the valve body 11. Specifically, the valve body 11 has an annular card slot 116, the card slot 116 communicates with the mounting cavity 114, and the outer end of the assembly element 123 has a snap ring 1233, the snap ring 1233 protruding from the outer peripheral wall of the assembly element 123, wherein the snap ring 1233 of the assembly element 123 is snapped into the card slot 116 of the valve body 11 so that the assembly element 123 is snap-fitted to the valve body 11.

[0043] Optionally, in other examples of the solenoid valve of the present utility model, the assembly element 123 may also be screwed to the valve body 11 to mount the check assembly 12 in the mounting cavity 114 of the valve body 11. Specifically, the outer peripheral wall of the assembly element 123 has an external thread, and the inner wall of the valve body 11 for defining the mounting cavity 114 has an internal thread, and the external thread of the assembly element 123 and the internal thread of the valve body 11 cooperate with each other for screwing the assembly element 123 to the valve body 11.

[0044] Continue to refer to the appendix Figure 1 , Figure 2 , Figures 5 to 9 , the assembly element 123 has a groove 1234, the groove 1234 extends from the outer end of the assembly element 123 towards the inner end, the snap ring 1233 surrounds the groove 1234, and the surface of the snap ring 1233 facing the inner end of the assembly element 123 is an inclined surface. The process of installing the check assembly 12 into the installation cavity 114 of the valve body 11 is as follows: First, insert the check element 121 and the compression spring element 122 into the installation cavity 114 of the valve body 11, and allow the inclined surface of the snap ring 1233 of the assembly element 123 to fit against the opening edge of the installation cavity 114 of the valve body 11. Second, press the assembly element 123 into the installation cavity 114 of the valve body 11. During this process, the inner wall of the valve body 11 that defines the installation cavity 114 presses the snap ring 1233 of the assembly element 123. Since the snap ring 1233 surrounds the groove 1234 of the assembly element 123, when the snap ring 1233 of the assembly element 123 is pressed, the outer end of the assembly element 123 will undergo slight deformation. After the position of the snap ring 1233 of the assembly element 123 moves to the position of the card slot 116 of the valve body 11, the outer end of the assembly element 123 returns to its original shape, causing the snap ring 1233 of the assembly element 123 to be snapped into the card slot 116 of the valve body 11, thereby causing the assembly element 123 to be clamped to the valve body 11.

[0045] Preferably, refer to the appendix Figure 9 , the valve body 11 has a first wall 1161, a second wall 1162, and a third wall 1163. The first wall 1161 and the third wall 1163 face each other, and the second wall 1162 connects the first wall 1161 and the third wall 1163 to form the card slot 116 by the first wall 1161, the second wall 1162, and the third wall 1163. Wherein the third wall 1163 of the valve body 11 is adjacent to the outer end face of the assembly element 123, and the third wall 1163 of the valve body 11 is an inclined surface. In this way, when the assembly element 123 is subjected to a large pulling force, it is easy to disassemble the check assembly 12 from the installation cavity 114 of the valve body 11. For example, after assembling the check valve 10, if the inspection of the check valve 10 fails, it is necessary to disassemble the check assembly 12 from the installation cavity 114 of the valve body 11 and install another check assembly 12 into the installation cavity 114 of the valve body 11, so as to avoid waste of the valve body 11.

[0046] Those skilled in the art should understand that the embodiments of the present utility model described above and shown in the accompanying drawings are only examples and do not limit the present utility model. The object of the present utility model has been fully and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and explained in the embodiments, and without departing from the said principles, any deformation or modification can be made to the embodiments of the present utility model.

Claims

1. Check valve, characterized in that: include: a valve body, wherein the valve body has a valve body space, a water inlet channel, a water outlet channel and an installation cavity, the water inlet channel and the water outlet channel are respectively connected to the valve body space, the installation cavity is connected to the water outlet channel, and the inner diameter of the installation cavity is larger than the inner diameter of the water outlet channel, so that the valve body forms a fitting surface at the opening of the water outlet channel; and A non-return assembly, wherein the non-return assembly is installed in the installation cavity of the valve body, the non-return assembly includes a non-return element, a compression spring element and an assembly element, the outer diameter of the non-return element is smaller than the inner diameter of the installation cavity of the valve body, the assembly element has at least one element through hole, the assembly element is fixedly installed on the valve body, the opposite ends of the compression spring element respectively abut against the assembly element and the non-return element, and the compression spring element presses the end face of the non-return element toward the fitting surface of the valve body. 2 . The check valve according to claim 1 , wherein the fitting surface of the valve body surrounds the opening of the water outlet channel. 3 . The check valve according to claim 1 , wherein opposite ends of the compression spring element are mounted to the check element and the fitting element, respectively.

4. The check valve according to claim 1, wherein the check element has a first mounting column, the assembly element has a second mounting column, one end of the compression spring element is sleeved on the first mounting column of the check element, and the other end of the compression spring element is sleeved on the second mounting column of the assembly element.

5. The check valve according to claim 3, wherein the check element has a first mounting column, and the assembly element has a second mounting column, and in a natural state, the inner diameter of one end of the compression spring element is slightly smaller than the outer diameter of the first mounting column of the check element, so that the end of the compression spring element is mounted on the first mounting column in a manner constrained to the first mounting column of the check element, and the inner diameter of the other end of the compression spring element is slightly smaller than the second mounting column of the assembly element, so that the end of the compression spring element is mounted on the second mounting column in a manner constrained to the second mounting column of the assembly element.

6. The check valve according to any one of claims 1 to 5, wherein the assembly element is clamped to the valve body.

7. The check valve according to any one of claims 1 to 5, wherein the fitting element is screwed onto the valve body.

8. A check valve according to claim 6, wherein the valve body has an annular groove, the groove is connected to the installation cavity, the outer end of the assembly element has a clamping ring, the clamping ring protrudes from the outer peripheral wall of the assembly element, wherein the clamping ring of the assembly element is clamped into the groove of the valve body so that the assembly element is clamped to the valve body.

9. The check valve according to claim 8, wherein the assembly element has a groove extending from the end surface of the outer end toward the inner end, the retaining ring surrounds the groove, and the surface of the retaining ring facing the inner end of the assembly element is a slope.

10. A check valve according to claim 8, wherein the valve body has a first wall, a second wall and a third wall, the first wall and the third wall are face to face, the second wall connects the first wall and the third wall so that the groove is defined by the first wall, the second wall and the third wall, the third wall of the valve body is adjacent to the outer end surface of the assembly element, and the third wall is a slope.

11. A solenoid valve with a check valve, characterized in that: include: a flow control unit; and The check valve according to any one of claims 1 to 10, wherein the flow control unit is installed on the valve body of the check valve, and the flow control unit controls the communication state between the valve body space of the valve body and the water outlet channel.

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