Check valve

Abstract

The utility model relates to the technical field of valves, and discloses a check valve. The check valve comprises a valve body, a limiting piece and a check assembly, a flow channel and a sealing face formed on the flow channel wall of the flow channel are arranged in the valve body, the outlet end of the flow channel is used for being connected with an external pipeline, the flow channel wall, close to the outlet end, of the flow channel is further provided with a limiting groove, and a check cavity is formed between the sealing face and the limiting groove; the limiting piece is mounted in the limiting groove; the check assembly is arranged in the check cavity and comprises a check bush and a check valve clack, the end, away from the check valve clack, of the check bush abuts against the limiting piece, a guide hole is formed in the check bush, the check valve clack comprises a sealing part and a guide rod part which are connected, and the guide rod part is arranged in the guide hole in a sliding and penetrating mode. The sealing part can be in sealing fit with the sealing face. According to the check valve, the arrangement of a check valve cover is omitted, the machining difficulty can be reduced, the machining and assembling efficiency can be improved, and it can be guaranteed that the check valve has good use performance.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a check valve. Background Technology

[0002] A check valve is a valve that automatically prevents the backflow of a medium (such as liquid, gas, or steam). It opens or closes automatically according to the direction of medium flow without external operation. When the medium flows in the forward direction, it pushes the valve disc to open, allowing the medium to pass through; when the medium flows in the reverse direction, the medium pressure and spring force work together to close the valve disc, preventing backflow.

[0003] A check valve typically includes a valve body and a check assembly. The valve body contains a flow channel and a sealing surface formed on the channel wall. The check assembly includes a check valve cover, a valve disc, and a resilient element. The check valve cover is connected to the outlet of the flow channel, and the valve disc is movably disposed within the flow channel and can press the sealing surface tightly under the elastic pressure of the resilient element. However, this configuration usually presents the following problems:

[0004] 1) To prevent the valve disc from becoming eccentric during operation, a guide hole is integrally formed on the check valve cover. The valve disc includes a connected sealing part and a guide rod part. The sealing part can seal with the sealing surface, and the guide rod part slides through the guide hole of the check valve cover. However, this design usually requires high machining precision for the check valve cover, making machining difficult and costly.

[0005] 2) When the check valve cover is threaded to the valve body, in order to ensure the sealing effect, it is usually necessary to wrap Teflon tape or apply anaerobic adhesive at the threaded connection as a sealing structure, which results in more assembly steps and lower assembly efficiency; and if the sealing structure is too thick, the check valve cover and the valve body cannot be connected, and if the sealing structure is too thin, leakage is likely to occur between the check valve cover and the valve body.

[0006] Therefore, there is an urgent need for a check valve to solve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide a check valve that simplifies the processing steps, reduces processing difficulty and cost, and improves the safety of the check valve in use.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A check valve, comprising:

[0010] The valve body has a flow channel and a sealing surface formed on the flow channel wall. The outlet end of the flow channel is used to connect to an external pipeline. A limiting groove is also provided on the flow channel wall near the outlet end. A check cavity is formed between the sealing surface and the limiting groove.

[0011] A limiting component is installed in the limiting groove;

[0012] A check valve assembly is disposed in the check cavity. The check valve assembly includes a check bushing and a check valve disc. The end of the check bushing away from the check valve disc abuts against the limiting member, and the check bushing is provided with a guide hole. The check valve disc includes a sealing part and a guide rod part connected to each other. The guide rod part slides through the guide hole, and the sealing part can seal with the sealing surface.

[0013] As a preferred embodiment of the check valve provided by this utility model, the valve body is an integral structure.

[0014] As a preferred embodiment of the check valve provided by this utility model, the limiting member has an opening on one side.

[0015] As a preferred embodiment of the check valve provided by this utility model, the check bushing is made of plastic; and / or the check valve disc is made of plastic.

[0016] As a preferred embodiment of the check valve provided by this utility model, the guide rod portion and the guide hole are in clearance fit.

[0017] As a preferred embodiment of the check valve provided by this utility model, the check bushing includes a bushing body and at least two limiting claws. Each of the limiting claws is arranged at intervals along the circumference of the bushing body, and the sealing part is limited within the limiting space formed by the limiting claws.

[0018] As a preferred embodiment of the check valve provided by this utility model, the bushing body includes an inner ring bushing, an outer ring bushing, and a connecting rod portion. The inner ring bushing is annular, and the inner ring hole of the inner ring bushing forms the guide hole. The outer ring bushing is disposed around the inner ring bushing. The two ends of the connecting rod portion are respectively connected to the outer wall of the inner ring bushing and the inner wall of the outer ring bushing. The limiting claw is connected to the outer ring bushing.

[0019] As a preferred embodiment of the check valve provided by this utility model, the number of connecting rods is at least two, and each connecting rod is arranged at intervals along the circumference of the inner ring bushing.

[0020] As a preferred embodiment of the check valve provided by this utility model, a limiting portion is formed on the flow channel wall, and the end of the check bushing away from the limiting member abuts against the limiting portion.

[0021] As a preferred embodiment of the check valve provided by this utility model, the check valve is a check gate valve, a check ball valve, a check stop valve, or a check pressure reducing valve.

[0022] The beneficial effects of this utility model are as follows:

[0023] The check valve provided by this utility model, by incorporating a check component, can prevent the backflow of liquid medium downstream of the flow channel. By directly connecting the outlet end of the flow channel to an external pipeline, the check valve cover required in existing technologies can be omitted, thereby eliminating the steps of processing and assembling the check valve cover, reducing processing difficulty, and improving processing and assembly efficiency. By providing a guide hole on the check bushing that slides with the guide rod of the check valve disc, the movement of the check valve disc in the flow channel is guided, thus preventing eccentricity during movement and ensuring a proper seal on the sealing surface. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the check valve provided in this embodiment of the utility model;

[0026] Figure 2 This is a cross-sectional schematic diagram of the check valve provided in this embodiment of the utility model;

[0027] Figure 3 This is a cross-sectional schematic diagram of the valve body provided in an embodiment of this utility model;

[0028] Figure 4 This is one of the exploded structural diagrams of the anti-return assembly and the limiting member provided in this embodiment of the utility model;

[0029] Figure 5 This is the second exploded structural diagram of the anti-return component and the limiting component provided in this embodiment of the utility model;

[0030] Figure 6 This is one of the structural schematic diagrams of the check bushing provided in this utility model embodiment;

[0031] Figure 7 This is the second schematic diagram of the structure of the check bushing provided in this embodiment of the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the limiting member provided in this embodiment of the utility model.

[0033] Figure label:

[0034] 10. Valve body assembly; 11. Valve body; 111. Flow channel; 1110. Sealing surface; 1111. Outlet end; 1112. Limiting part; 1113. Limiting groove; 1114. Check cavity; 112. Mounting port; 12. Main valve cover; 121. Through hole; 1211. Limiting step surface; 122. Limiting structure;

[0035] 20. Check valve assembly; 21. Check valve bushing; 211. Bushing body; 2110. Guide hole; 2111. Inner ring bushing; 2112. Outer ring bushing; 2113. Connecting rod; 212. Limiting claw; 22. Check valve disc; 221. Sealing part; 2211. Receiving groove; 222. Guide rod; 23. Check valve elastic element; 24. Check valve seal;

[0036] 30. Valve stem assembly; 31. Valve stem; 311. Limiting protrusion; 32. Valve core; 33. Handle;

[0037] 40. Limiting component; 401. Opening;

[0038] 501, First seal; 502, Second seal. Detailed Implementation

[0039] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0040] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0042] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0043] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0044] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0045] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0046] This embodiment provides a check valve, which is used in various pipelines to cut off or connect the flow of media in the pipeline, so as to prevent theft of liquid media and cut off water supply in case of malicious non-payment. The check valve can be a check gate valve, a check ball valve, a check globe valve, or a check pressure reducing valve, and no specific limitation is made here.

[0047] Figure 1 A schematic diagram of the check valve provided in this embodiment is shown. Figure 2 A cross-sectional schematic diagram of the check valve provided in this embodiment is shown. Figures 1-2 As shown, the check valve provided in this embodiment includes a valve body assembly 10 and a valve stem assembly 30. The valve body assembly 10 includes a valve body 11 and a main valve cover 12. The valve body 11 has a flow channel 111 and an installation port 112 connected to the flow channel 111. The two ends of the flow channel 111 are used to connect to external pipelines so that the liquid medium in the external pipeline can flow through the flow channel 111. The main valve cover 12 is installed in the installation port 112. The valve stem assembly 30 includes a valve stem 31 and a valve core 32 connected to the valve stem 31. The valve stem 31 is rotatably inserted into the valve body assembly 10. The valve core 32 is located in the flow channel 111. By rotating the valve stem 31 around the axis in different directions, the valve core 32 can be lowered or raised, thereby cutting off or connecting the flow channel 111, realizing the interception or flow of the liquid medium, and thus realizing the closing or opening of the check valve.

[0048] In this embodiment, the valve stem 31 is threaded to the valve core 32. By rotating the valve stem 31, the valve core 32 can be moved along the axial direction of the valve stem 31. The valve stem assembly 30 has a simple structure, is easy to manufacture, and is easy to adjust.

[0049] In this embodiment, the main valve cover 12 is threadedly connected to the mounting port 112 of the valve body 11. The threaded connection offers advantages such as easy assembly and disassembly, and a secure connection. To prevent liquid medium in the flow channel 111 from leaking through the gap between the valve body 11 and the main valve cover 12, a first sealing element 501 is also provided between the valve body 11 and the main valve cover 12. The first sealing element 501 can be a sealing ring.

[0050] like Figure 2 As shown, a through hole 121 is provided in the main valve cover 12. The through hole 121 extends along the axial direction of the main valve cover 12. One end of the valve stem 31 is rotatably installed in the through hole 121, and the other end of the valve stem 31 is connected to the valve core 32. The through hole 121 on the main valve cover 12 can facilitate the quick positioning and installation of the valve stem assembly 30.

[0051] Optionally, a limiting step surface 1211 is provided on the wall of the through hole 121, and a limiting protrusion 311 is provided on the side wall of the valve stem 31. The top of the limiting protrusion 311 can abut against the limiting step surface 1211, thereby limiting the upward movement of the valve stem assembly 30.

[0052] Optionally, a limiting structure 122 is provided at the bottom of the through hole 121, and the bottom surface of the limiting protrusion 311 abuts against the limiting structure 122. The limiting structure 122 can prevent the valve stem assembly 30 from falling out of the through hole 121. In this embodiment, the limiting structure 122 is threadedly connected to the inner wall of the through hole 121, and the valve stem 31 passes through the limiting structure 122 and can rotate relative to the limiting structure 122.

[0053] To ensure a tight seal between the valve stem 31 and the main valve cover 12, a second seal 502 is provided between the valve stem 31 and the through hole 121. The second seal 502 prevents leakage of liquid medium between the valve stem 31 and the through hole 121. In this embodiment, the second seal 502 is a rubber sealing ring.

[0054] To facilitate adjustment of the valve core 32 position by the operator, a handle 33 is connected to one end of the valve stem 31 extending out of the main valve cover 12. The operator can hold the handle 33 and turn it to rotate the valve stem 31, thereby achieving the cut-off or flow of the liquid medium, making operation convenient.

[0055] Figure 3 A cross-sectional schematic diagram of the valve body 11 provided in this embodiment is shown. Figure 4 One of the exploded structural diagrams of the check valve assembly 20 and the limiting member 40 provided in this embodiment is shown. Figure 5 This is a second exploded structural diagram of the check valve assembly 20 and the limiting member 40 provided in this embodiment. (See attached diagram.) Figures 3-5 and combined Figure 2As shown, the check valve also includes a check assembly 20 and a limiting member 40. A sealing surface 1110 is formed on the flow channel wall of the flow channel 111 of the valve body 11. The outlet end 1111 of the flow channel 111 is used to connect to an external pipeline. A limiting groove 1113 is also provided on the flow channel wall near the outlet end 1111 of the flow channel 111. A check cavity 1114 is formed between the sealing surface 1110 and the limiting groove 1113. The limiting member 40 is installed in the limiting groove 1113. The check assembly... The check assembly 20 is disposed in the check cavity 1114. The check assembly 20 includes a check bushing 21 and a check valve disc 22. The end of the check bushing 21 away from the check valve disc 22 abuts against the limiting member 40, and the check bushing 21 is provided with a guide hole 2110. The check valve disc 22 includes a sealing part 221 and a guide rod part 222 connected to each other. The guide rod part 222 slides through the guide hole 2110, and the sealing part 221 can seal with the sealing surface 1110.

[0056] The check valve provided in this embodiment, by setting the check assembly 20, can prevent the backflow of liquid medium downstream of the flow channel 111. By setting the outlet end 1111 of the flow channel 111 to be directly connected to the external pipeline, the setting of the check valve cover in the prior art can be omitted, thereby eliminating the processing and assembly steps of the check valve cover, reducing processing difficulty, and improving processing and assembly efficiency. By setting the guide hole 2110 on the check bushing 21, which can slide and cooperate with the guide rod portion 222 of the check valve disc 22, the movement of the check valve disc 22 in the flow channel 111 can be guided, thereby preventing it from becoming eccentric during the movement and affecting its sealing effect on the sealing surface 1110.

[0057] In this embodiment, the valve body 11 is an integral structure, which saves the step of assembling multiple parts together, and omits the valve cover setting in the prior art, simplifying the processing technology and improving processing and assembly efficiency.

[0058] like Figure 2 , Figure 4 and Figure 5As shown, the check valve assembly 20 also includes a check valve spring 23, which is sleeved on the guide rod portion 222, with its two ends abutting against the sealing portion 221 and the check bushing 21, respectively. When the pressure at the inlet end of the flow channel 111 is greater than the pressure at the outlet end 1111, the liquid medium can push the check valve disc 22 away from the sealing surface 1110, while compressing the check valve spring 23. At this time, the liquid medium at the inlet end of the flow channel 111 can flow out through the gap between the sealing portion 221 and the sealing surface 1110 to the outlet end 1111 of the flow channel 111. When the flow channel 111 is cut off, the check valve disc 22 can be reset under the elastic restoring force of the check valve spring 23 and press against the sealing surface 1110 under the elastic force of the check valve spring 23, thereby preventing the liquid medium from flowing back. In this embodiment, the check valve spring 23 is a spring, which is easy to install and has a low cost.

[0059] Optionally, the check valve assembly 20 further includes a check valve seal 24, which is fitted onto the sealing portion 221 and can seal against the sealing surface 1110 to improve the sealing effect between the sealing portion 221 and the sealing surface 1110. In this embodiment, the check valve seal 24 is a rubber sealing ring, which has a high sealing effect, is easy to install, and is readily available and inexpensive. In this embodiment, a receiving groove 2211 for accommodating the check valve seal 24 is provided on the side wall of the sealing portion 221. By providing the receiving groove 2211, the check valve seal 24 can be stably installed, preventing it from shifting or falling off during use.

[0060] In related technologies, the guide hole is located on a metal check valve cover. When metal is immersed in a liquid medium for a long time, metal oxide impurities are easily precipitated, leading to scale buildup in the gap between the guide rod and the guide hole. This can cause the guide rod to become stuck in the guide hole, preventing it from sliding smoothly. To solve this problem, in this embodiment, the check valve disc 22 is made of plastic; the check bushing 21 is also made of plastic. This effectively prevents scale buildup in the gap between the guide rod 222 and the guide hole 2110, avoiding jamming and ensuring the stability and smoothness of the sliding process of the guide rod 222 relative to the guide hole 2110.

[0061] Optionally, the check valve disc 22 is a one-piece molded structure, omitting the connection between the sealing part 221 and the guide rod part 222, saving the connecting parts between the two, thereby reducing production costs and improving the overall structural stability of the check valve disc 22. In this embodiment, the check valve disc 22 is molded using injection molding, which has the advantages of high molding precision, good consistency, and low cost.

[0062] To further ensure the stability of the sliding process of the guide rod 222 relative to the guide hole 2110, in this embodiment, the guide rod 222 and the guide hole 2110 are clearance-fitted to provide sufficient space for the movement of the guide rod 222.

[0063] Figure 6 One of the structural schematic diagrams of the check bushing 21 provided in this embodiment is shown. Figure 7 This is a second schematic diagram of the structure of the check bushing 21 provided in this embodiment. (See attached diagram.) Figures 6-7 and combined Figure 2 As shown, the check valve bushing 21 includes a bushing body 211 and at least two limiting claws 212. Each limiting claw 212 is spaced circumferentially on the bushing body 211, and the sealing portion 221 is confined within the limiting space formed by the limiting claws 212. The limiting claws 212 guide and limit the movement of the check valve disc 22, allowing it to move along the extension direction of the limiting claws 212 within the limiting space, thereby preventing the check valve disc 22 from becoming eccentric.

[0064] In this embodiment, there are three limiting claws 212. These three claws form a circular limiting space, providing guidance and limiting for the installation and movement of the check valve disc 22. This effectively prevents the check valve disc 22 from becoming eccentric and reduces the number of limiting claws 212, thereby lowering the manufacturing cost of the check valve. Of course, in other embodiments, the number of limiting claws 212 can be four, five, six, or even more. This embodiment does not limit the specific number of limiting claws 212; designers can adjust it according to actual manufacturing requirements.

[0065] like Figures 4-5 As shown, the bushing body 211 includes an inner ring bushing 2111, an outer ring bushing 2112, and a connecting rod portion 2113. The inner ring bushing 2111 is annular, and its inner ring hole forms the aforementioned guide hole 2110. The outer ring bushing 2112 is disposed around the inner ring bushing 2111. The two ends of the connecting rod portion 2113 are respectively connected to the outer wall of the inner ring bushing 2111 and the inner wall of the outer ring bushing 2112. A limiting claw 212 is connected to the outer ring bushing 2112. This design can reduce the material used in the check bushing 21, thereby reducing material costs.

[0066] Optionally, the number of connecting rods 2113 is at least two, and each connecting rod 2113 is arranged at intervals along the circumference of the inner ring bushing 2111, which further ensures the stable connection between the inner ring bushing 2111 and the outer ring bushing 2112, and can improve the uniformity of the force on the inner ring bushing 2111 and the outer ring bushing 2112.

[0067] In this embodiment, the check bushing 21 is a one-piece molded structure, eliminating the connection between the bushing body 211 and the limiting claw 212, thus saving on connecting parts and reducing production costs while improving the overall structural stability of the check bushing 21. In this embodiment, the check bushing 21 is molded using injection molding, which has the advantages of high molding precision, good consistency, and low cost.

[0068] Figure 8 A schematic diagram of the structure of the limiting member 40 provided in this embodiment is shown. Figure 8 and combined Figure 2 , Figure 3 As shown, to facilitate the assembly of the limiting member 40 with the valve body 11, an opening 401 is provided on one side of the limiting member 40. By providing the opening 401, the elastic deformation of the limiting member 40 can be increased to ensure the ease of installation of the limiting member 40. Specifically, after the check valve assembly 20 is installed into the valve body 11 from the outlet end 1111 of the flow channel 111, the operator can press the two sides of the limiting member 40 to deform it. At this time, the width of the opening 401 decreases, that is, the radial dimension of the limiting member 40 shrinks, so that it can be easily installed into the flow channel 111 of the valve body 11. When the limiting member 40 is aligned with the limiting groove 1113, the limiting member 40 can also be engaged in the limiting groove 1113 under the action of its elastic restoring force, thereby achieving a stable installation of the limiting member 40.

[0069] In this embodiment, the limiting member 40 can be directly made of elastic retaining ring or snap ring. Both elastic retaining ring and snap ring are commonly used parts in the prior art, which are easy to source and install. Compared with the check valve cover, it can greatly reduce the processing cost and processing difficulty, and at the same time improve the assembly efficiency of the entire check valve.

[0070] Continue as Figure 2 and Figure 3 As shown, a limiting portion 1112 is formed on the flow channel wall of the flow channel 111, and the end of the check bushing 21 away from the limiting member 40 (specifically, the free end of the limiting claw 212) abuts against the limiting portion 1112. By providing the limiting portion 1112, the check bushing 21 can be limited to ensure the stable installation of the check bushing 21.

[0071] In this embodiment, the limiting part 1112 is a protruding structure protruding into the valve body 11, which has a simple structure and is easy to process and manufacture.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A check valve, characterized by, The utility model relates to a valve body (11) is provided with flow channel (111) and sealing surface (1110) formed on the flow channel wall of flow channel (111) in, the outlet end (1111) of flow channel (111) is used to connect external pipeline, the flow channel wall of flow channel (111) is close to the outlet end (1111) still be provided with the limiting groove (1113), the sealing surface (1110) and the limiting groove (1113) between form check cavity (1114); Limiting piece (40) is installed in the limiting groove (1113); Check assembly (20) is provided in check cavity (1114), check assembly (20) includes check bushing (21) and check valve clack (22), the one end of check bushing (21) away from check valve clack (22) is butted on limiting piece (40), and check bushing (21) is provided with guide hole (2110) on, check valve clack (22) includes the sealing portion (221) and guide rod portion (222) connected, guide rod portion (222) is slid through in guide hole (2110), the sealing portion (221) can be sealed with sealing surface (1110) cooperation. The valve body (11) is an integral structure.

2. The check valve of claim 1, wherein One side of the limiting piece (40) is provided with an opening (401).

3. The check valve of claim 1, wherein The check bushing (21) is made of plastic material; and / or the check valve clack (22) is made of plastic material.

4. The check valve of claim 1, wherein The guide rod portion (222) and the guide hole (2110) are gap fit.

5. The check valve of claim 1, wherein The check bushing (21) includes a bushing body (211) and at least two limiting clamps (212), each limiting clamp (212) is arranged on the bushing body (211) along the circumference of the bushing body (211), and the sealing portion (221) is limited in the limiting space formed by each limiting clamp (212).

6. The check valve of claim 1, wherein The bushing body (211) includes an inner ring bushing (2111), an outer ring bushing (2112), and a connecting rod portion (2113), the inner ring bushing (2111) is annular, the inner ring hole of the inner ring bushing (2111) forms the guide hole (2110), the outer ring bushing (2112) is arranged outside the inner ring bushing (2111), the connecting rod portion (2113) is connected to the outer wall of the inner ring bushing (2111) and the inner wall of the outer ring bushing (2112) at both ends, and the limiting clamp (212) is connected to the outer ring bushing (2112).

7. The check valve of claim 6, wherein The number of the connecting rod portion (2113) is at least two, and each connecting rod portion (2113) is arranged along the circumference of the inner ring bushing (2111).

8. The check valve of claim 7, wherein, The flow channel wall of the flow channel (111) forms a limiting portion (1112), and one end of the check bushing (21) away from the limiting piece (40) abuts against the limiting portion (1112).

9. The check valve of claim 1, wherein The check valve is a check gate valve, a check ball valve, a check stop valve, or a check pressure reducing valve.

10. The check valve of any one of claims 1-9, wherein, ​

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