A spring check valve

Abstract

The application relates to the technical field of valves, in particular to a spring check valve which comprises a valve body assembly, a valve clack, a spring and a sealing ring, the valve body assembly is internally provided with a liquid inlet, a flow channel and a liquid outlet which are sequentially communicated, the valve clack is movably installed in the flow channel, a spring limiting piece is fixedly arranged in the flow channel, one end of the spring is in abutment with the spring limiting piece, the other end of the spring is in abutment with one end of the valve clack, the other end of the valve clack is in abutment with the sealing ring, a guide structure is arranged on the flow channel, when it is needed to close the flow channel, the spring exerts elastic force on the valve clack to drive the valve clack to move along the flow channel until the valve clack is in abutment with the sealing ring, and sealing is realized; in the process that the valve clack moves along the flow channel, the guide structure limits the movement of the valve clack, plays a guiding role on the valve clack, prevents the valve clack from deviating from an ideal track and being dislocated with the sealing ring, avoids fluid leakage through the gap between the valve clack and the sealing ring, and therefore the sealing effect of the spring check valve is improved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a spring check valve. Background Technology

[0002] Currently, in traditional spring-loaded check valves on the market, the valve core may experience unbalanced movement during reciprocating motion. This results in uneven compression force exerted by the valve core on the sealing ring, which can easily lead to misalignment and liquid leakage. In addition, the sealing rings used in traditional spring-loaded check valves typically have a flat sealing surface. Flat compression requires a larger force than radial compression, and a larger spring force is needed to achieve a seal, which affects product cost and service life. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art where the unbalanced reciprocating motion of the valve disc may lead to misalignment between the valve disc and the sealing ring. This invention provides a spring check valve that can improve the stability of the reciprocating motion of the valve disc, prevent misalignment between the valve disc and the sealing ring, and avoid sealing failure.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A spring check valve is provided, comprising a valve body assembly, a valve disc, a spring, and a sealing ring. The valve body assembly has an inlet, a flow channel, and an outlet connected in sequence. The valve disc is movably installed in the flow channel. A spring limiting member is fixedly installed in the flow channel. One end of the spring abuts against the spring limiting member, and the other end abuts against one end of the valve disc. The sealing ring is fixedly installed at the junction of the flow channel and the inlet. The other end of the valve disc abuts against the sealing ring. A guide structure is provided on the inner wall of the flow channel to restrict the movement direction of the valve disc.

[0006] In this utility model, the spring check valve allows fluid to enter the flow channel through the inlet and exit through the outlet. When the spring check valve needs to be closed, the spring applies elastic force to the valve disc, driving the valve disc to move along the flow channel until the valve disc abuts against the sealing ring, achieving a seal. During the movement of the valve disc along the flow channel, the guide structure restricts the movement of the valve disc perpendicular to the flow channel axis, thus guiding the valve disc, improving the stability of the valve disc's movement, preventing the valve disc from deviating from the ideal trajectory and misaligning with the sealing ring, and avoiding fluid leakage through the gap between the valve disc and the sealing ring, thereby improving the sealing effect of the spring check valve.

[0007] Furthermore, the guiding structure comprises multiple guide ribs, the wall surface of which faces the valve disc is parallel to the axis of the flow channel, and the valve disc is located between the multiple guide ribs. When the valve disc moves in a direction perpendicular to the axis of the flow channel, it is blocked by the guide ribs, thereby reducing the offset of the valve disc during movement and improving the stability of the valve disc movement.

[0008] Furthermore, the valve disc is provided with two sets of lugs, each set of lugs contacting both sides of one of the guide ribs. When the valve disc moves along the flow channel, the lugs and the guide ribs slide relative to each other, and the guide ribs guide the valve disc by restricting the movement direction of the lugs.

[0009] Furthermore, a valve stem is fixedly connected to one end of the valve disc that abuts against the spring. The spring is sleeved on the valve stem, and the spring limiting member has a second through hole through which the valve stem can pass. The second through hole can limit the movement direction of the valve disc by restricting the movement direction of the valve stem; at the same time, the valve stem can limit the deformation direction of the spring sleeved on the valve stem, thereby improving the stability of the spring movement.

[0010] Furthermore, the spring limiting member is provided with multiple limiting protrusions extending towards the liquid inlet, and the end of the spring that abuts against the spring limiting member is located between the multiple limiting protrusions. The limiting protrusions limit the spring, preventing the spring from disengaging from the spring limiting member and improving the stability of the spring's movement.

[0011] Furthermore, the bottom of the valve disc is provided with a spring limiting groove that cooperates with the spring, and the spring abuts against the spring limiting groove. The spring limiting groove limits the spring, preventing the spring from disengaging from the valve disc and improving the stability of the spring's movement.

[0012] Furthermore, the sealing ring has an arc-shaped sealing surface that abuts against the valve disc, and the surface of the valve disc that abuts against the arc-shaped sealing surface is spherical. Sealing is achieved by the mutual compression of the spherical surface of the valve disc and the arc-shaped sealing surface of the sealing ring. Compared to planar compression, this reduces the force-bearing area and increases the pressure, lowering the pressure required to achieve a seal between the valve disc and the sealing ring, improving the sealing effect, and reducing the requirement for spring force. A spring with a smaller wire diameter can be used, reducing product costs.

[0013] Furthermore, the inner top of the sealing ring is provided with a straight section parallel to the fluid flow direction, and the straight section is connected to the arc-shaped sealing surface. Providing a straight section parallel to the fluid flow direction avoids direct impact from the fluid on the arc-shaped sealing surface, preventing long-term fluid impact from reducing the flatness of the arc-shaped sealing surface and affecting the sealing effect.

[0014] Furthermore, the valve body assembly includes a valve body, a valve cap, and a socket. The inlet is located in the socket, the flow channel and the outlet are located in the valve body, and the socket passes through the valve cap. Both the valve body and the socket are detachably installed inside the valve cap. The sealing ring includes a first sealing part and a second sealing part. The second sealing part is fixedly connected to the inner side of the first sealing part. One end of the first sealing part abuts against the socket, and the other end abuts against the valve body. The second sealing part abuts against the valve disc. During installation, the spring is sleeved on the valve stem, and the valve disc and spring are installed in the valve body, so that both ends of the spring abut against the spring limiting member and the valve disc, respectively. The socket is passed through the valve cap, and the sealing ring is placed between the socket and the valve body. The socket and the valve body are fixed with the valve cap. The valve body assembly is formed by assembling the valve body, valve cap, and socket, which facilitates the installation of the spring check valve. If the valve body, valve cap, or socket is damaged, only the damaged part needs to be replaced, and the entire spring check valve does not need to be replaced.

[0015] Furthermore, the valve body has a recessed platform at its top, in which a gasket is installed. The bottom of the second sealing part abuts against the gasket, and the gasket and the side wall of the recessed platform form a sealing groove. The bottom of the first sealing part has a protrusion that mates with the sealing groove, and the protrusion abuts against the sealing groove. The recessed platform and the gasket can limit the sealing ring, restrict its deformation, extend its service life, and enhance the sealing effect.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The spring check valve of this utility model has the following characteristics: 1. The guiding structure restricts the movement of the valve disc perpendicular to the flow channel axis, guiding the valve disc and preventing misalignment between the valve disc and the sealing ring, thus avoiding fluid leakage through the gap between the valve disc and the sealing ring; 2. Sealing is achieved by the mutual compression of the spherical surface of the valve disc and the arc-shaped sealing surface of the sealing ring. Compared with planar compression, the force-bearing area is reduced and the pressure is increased, reducing the pressure required to achieve a seal between the valve disc and the sealing ring, improving the sealing effect, and reducing the requirement for spring force; 3. The straight section parallel to the fluid flow direction avoids direct impact of the fluid on the arc-shaped sealing surface, preventing long-term impact from reducing the flatness of the arc-shaped sealing surface and affecting the sealing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the spring check valve of this utility model.

[0019] Figure 2 This is a schematic diagram of the first structure of the valve body of the spring check valve of this utility model.

[0020] Figure 3This is a schematic diagram of the second structure of the valve body of the spring check valve of this utility model;

[0021] Figure 4 This is a schematic diagram of the valve disc structure of the spring check valve of this utility model;

[0022] Figure 5 This is a schematic diagram of the valve disc and valve stem of the spring check valve of this utility model.

[0023] In the attached diagram: 1. Valve body assembly; 11. Valve body; 111. Guide structure; 112. Recess; 113. Gasket; 114. Spring limiting component; 1141. Limiting protrusion; 1142. Second through hole; 115. First cylindrical section; 116. Conical section; 117. Second cylindrical section; 118. Flow channel; 119. Liquid outlet; 12. Valve cap; 13. Socket; 131. Annular protrusion; 132. Liquid inlet; 2. Valve disc; 21. Spherical surface; 22. Lug; 23. Spring limiting groove; 3. Valve stem; 4. Spring; 5. Sealing ring; 51. First sealing part; 52. Second sealing part; 521. Straight section; 522. Arc-shaped sealing surface. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Example 1

[0027] like Figures 1 to 5The first embodiment of the spring check valve of this utility model is shown. The spring check valve includes a valve body assembly 1, a valve disc 2, a spring 4, and a sealing ring 5. The valve body assembly 1 has an inlet 132, a flow channel 118, and an outlet 119 connected sequentially. The valve disc 2 is movably installed in the flow channel 118. A spring limiting member 114 is fixedly installed in the flow channel 118. One end of the spring 4 abuts against the spring limiting member 114, and the other end abuts against one end of the valve disc 2. The sealing ring 5 is fixedly installed at the junction of the flow channel 118 and the inlet 132. The other end of the valve disc 2 abuts against the sealing ring 5. A guide structure 111 is provided on the inner wall of the flow channel 118 to restrict the movement direction of the valve disc 2. In this embodiment, the spring 4 is made of nickel-chromium-titanium alloy to improve its elasticity and corrosion resistance. The surface of the spring 4 is coated with an F30 coating to further improve its corrosion resistance. The axes of the flow channel 118, the sealing ring 5, the valve disc 2, and the spring 4 coincide.

[0028] In this utility model of spring check valve, fluid enters the flow channel 118 through the inlet 132 and then flows out through the outlet 119. When it is necessary to close the flow channel 118, the spring 4 applies elastic force to the valve disc 2, driving the valve disc 2 to move along the flow channel 118 until the valve disc 2 abuts against the sealing ring 5, thus achieving a seal. During the movement of the valve disc 2 along the flow channel 118, the guide structure 111 guides the valve disc 2 by restricting its movement in the direction perpendicular to the axis of the flow channel 118, thereby improving the stability of the valve disc 2's movement, preventing the valve disc 2 from deviating from the ideal trajectory and misaligning with the sealing ring 5, and avoiding fluid leakage through the gap between the valve disc 2 and the sealing ring 5, thereby improving the sealing effect of the spring check valve.

[0029] like Figure 2 and Figure 3 As shown, the guide structure 111 consists of multiple guide ribs. The wall surface of the guide ribs facing the valve disc 2 is parallel to the axis of the flow channel 118, and the valve disc 2 is located between the multiple guide ribs. When the valve disc 2 moves in a direction perpendicular to the axis of the flow channel 118, it will be blocked by the guide ribs, thereby reducing the offset of the valve disc 2 during the movement and improving the stability of the valve disc 2's movement.

[0030] like Figure 4 and Figure 5 As shown, the valve disc 2 has two sets of lugs 22, each of which contacts one side of a guide rib. When the valve disc 2 moves along the flow channel 118, the lugs 22 slide relative to the guide rib, and the guide rib guides the valve disc 2 by restricting the movement direction of the lugs 22. In this embodiment, four guide ribs are provided on the inner wall of the flow channel 118, and eight lugs 22 are provided at the bottom of the valve disc 2. Each guide rib contacts one lug 22 on each side. The inner surfaces of the four guide ribs are located on the same imaginary cylindrical surface, and the diameter of the cylindrical surface is greater than the maximum length of the valve disc 2 in the direction perpendicular to the axis of the flow channel 118.

[0031] like Figure 5 As shown, a valve stem 3 is fixedly connected to one end of the valve disc 2 that abuts against the spring 4. The spring 4 is sleeved on the valve stem 3. The spring limiting member 114 is provided with a second through hole 1142 that allows the valve stem 3 to pass through. The second through hole 1142 can limit the movement direction of the valve disc 2 by restricting the movement direction of the valve stem 3; at the same time, the valve stem 3 can limit the deformation direction of the spring 4 sleeved on the valve stem 3, thereby improving the stability of the movement of the spring 4.

[0032] like Figure 2 and Figure 3 As shown, the spring limiting member 114 is provided with a plurality of limiting protrusions 1141 extending toward the liquid inlet 132. The end of the spring 4 that abuts against the spring limiting member 114 is located between the plurality of limiting protrusions 1141. The limiting protrusions limit the spring 4, preventing the spring 4 from disengaging from the spring limiting member 114 and improving the stability of the movement of the spring 4.

[0033] like Figure 1 As shown, the bottom of the valve disc 2 is provided with a spring limiting groove 23 that cooperates with the spring 4, and the spring 4 abuts against the spring limiting groove 23. The spring limiting groove 23 limits the spring 4, preventing the spring 4 from disengaging from the valve disc 2 and improving the stability of the spring 4's movement.

[0034] In this embodiment, as Figure 3 As shown, the spring limiting member 114 has a cross-shaped structure, the second through hole 1142 is located at the center of the spring limiting member 114, and there are four limiting protrusions 1141. The four limiting protrusions 1141 are centrally symmetrical, and the inner surfaces of the four limiting protrusions 1141 abut against the spring 4. When installing the spring 4, the spring 4 can be snapped between the four limiting protrusions 1141.

[0035] The working principle of the spring check valve in this embodiment is as follows: During installation, the spring 4 is sleeved on the valve stem 3, one end of the spring 4 is inserted into the spring limiting groove 23, and the other end of the spring 4 is engaged between the four limiting protrusions 1141 of the spring limiting member 114. The sealing ring 5 is installed on the inner wall of the flow channel 118, so that the valve disc 2 abuts against the sealing ring 5, thus completing the installation. When the spring check valve is in use, the fluid enters the flow channel 118 through the inlet 132 and then flows out through the outlet 119. When the spring check valve needs to be closed, the elastic force of the spring 4 drives the valve disc 2 to move along the flow channel 118. During the process, the guide ribs block the movement of valve disc 2 perpendicular to the axis of flow channel 118 and restrict the movement direction of the lugs 22 that are in contact with both sides of the guide ribs, thus guiding valve disc 2. The second through hole 1142 restricts the movement direction of valve stem 3, thus guiding valve disc 2. Valve stem 3 restricts the deformation direction of spring 4, improving the movement stability of spring 4 sleeved on valve stem 3, improving the movement stability of valve disc 2, preventing valve disc 2 from deviating from the ideal trajectory and misaligning with sealing ring 5, and avoiding fluid leakage through the gap between valve disc 2 and sealing ring 5, thereby improving the sealing effect of spring check valve.

[0036] Example 2

[0037] This embodiment is the second embodiment of the spring check valve of this utility model. This embodiment is similar to the first embodiment, except that, as follows: Figure 1 As shown, the sealing ring 5 has an arc-shaped sealing surface 522, which abuts against the valve disc 2. The surface of the valve disc 2 that abuts against the arc-shaped sealing surface 522 is a spherical surface 21. Sealing is achieved by the mutual compression of the spherical surface 21 of the valve disc 2 and the arc-shaped sealing surface 522 of the sealing ring 5. Compared to planar compression, the force-bearing area is reduced, and the pressure is increased. This reduces the pressure required to achieve a seal between the valve disc 2 and the sealing ring 5, improves the sealing effect, and reduces the requirement for the spring force of the spring 4. A spring with a smaller wire diameter can be used, reducing product costs.

[0038] like Figure 1 As shown, the top of the inner side of the sealing ring 5 is also provided with a straight section 521 parallel to the flow direction of the fluid, and the straight section 521 is connected to the arc-shaped sealing surface 522. The straight section 521 parallel to the flow direction of the fluid can prevent the arc-shaped sealing surface 522 from being directly impacted by the fluid, and prevent the long-term impact of the fluid from reducing the flatness of the arc-shaped sealing surface 522 and affecting the sealing effect.

[0039] The working principle of the spring check valve in this embodiment is as follows: In use, fluid enters the flow channel 118 through the inlet 132 and then flows out through the outlet 119. The straight section 521 of the sealing ring 5 prevents the fluid from directly impacting the arc-shaped sealing surface 522. When the spring check valve needs to be closed, the spring 4 applies elastic force to the valve disc 2, driving the valve disc 2 to move along the flow channel 118 until the valve disc 2 abuts against the sealing ring 5. The valve disc 2 blocks the fluid in the inlet 132 from entering the flow channel 118. The spherical surface 21 of the valve disc 2 and the arc-shaped sealing surface 522 of the sealing ring 5 squeeze each other, eliminating the gap between the spherical surface 21 and the arc-shaped sealing surface 522, thus achieving a seal between the valve disc 2 and the sealing ring 5.

[0040] Example 3

[0041] This embodiment is the third embodiment of the spring check valve of this utility model. This embodiment is similar to embodiment two, except that, as Figure 1 As shown, the valve body assembly 1 includes a valve body 11, a valve cap 12, and a socket 13. The inlet 132 is located in the socket 13, and the flow channel 118 and the outlet 119 are located in the valve body 11. The socket 13 passes through the valve cap 12. The valve body 11 and the socket 13 are detachably installed on the inner side of the valve cap 12. The sealing ring 5 includes a first sealing part 51 and a second sealing part 52. The second sealing part 52 is fixedly connected to the inner side of the first sealing part 51. One end of the first sealing part 51 abuts against the socket 13, and the other end abuts against the valve body 11. The second sealing part 52 abuts against the valve disc 2. During installation, spring 4 is fitted onto valve stem 3, and valve disc 2 and spring 4 are installed in valve body 11, with both ends of spring 4 abutting against spring limiting member 114 and valve disc 2 respectively. Socket 13 is passed through valve cap 12, and sealing ring 5 is placed between socket 13 and valve body 11. Socket 13 and valve body 11 are then fixed together with valve cap 12. Valve body assembly 1 is formed by assembling valve body 11, valve cap 12, and socket 13, facilitating the installation of the spring check valve. If valve body 11, valve cap 12, or socket 13 is damaged, only the damaged part needs to be replaced; the entire spring check valve does not need to be replaced. In this embodiment, the axes of valve body 11, valve cap 12, socket 13, valve disc 2, and valve stem 3 coincide.

[0042] like Figure 1 As shown, the top of the valve body 11 is provided with a recess 112, in which a gasket 113 is installed. The bottom of the second sealing part 52 abuts against the gasket 113. The gasket 113 and the side wall of the recess 112 form a sealing groove. The bottom of the first sealing part 51 is provided with a mounting protrusion that mates with the sealing groove, and the mounting protrusion abuts against the sealing groove. The recess 112 and the gasket 113 can limit the sealing ring 5, restrict the deformation of the sealing ring 5, extend the service life of the sealing ring 5, and enhance the sealing effect.

[0043] In this embodiment, the top of the valve cap 12 is provided with a first through hole, and the socket 13 passes through the first through hole. The bottom of the outer wall of the socket 13 is provided with an annular boss 131 extending in all directions. The annular boss 131 abuts against the top of the inner cavity of the valve cap 12. The inner sidewall of the valve cap 12 is provided with an internal thread, and the outer wall of the valve body 11 is provided with an external thread that mates with the internal thread. The valve cap 12 is fixedly connected to the valve body 11 through the internal thread. The valve body 11 includes a first cylindrical section 115, a conical section 116, and a second cylindrical section 117 connected in sequence. The liquid outlet 119 is disposed through the second cylindrical section 117, and the flow channel 118 is disposed through the first cylindrical section 115 and the conical section 116.

[0044] In this embodiment, the maximum chord length of the spherical surface 21 of the valve disc 2 is equal to 0.9 times the diameter of the spherical surface 21. The diameter of the cylindrical surface passing through the inner side of the four guide ribs is 1 mm longer than the maximum chord length of the spherical surface 21, so that the valve disc 2 can move stably along the flow channel 118. The straight section 521 and the arc-shaped sealing surface 522 are provided on the second sealing part 52 of the sealing ring 5. The length of the straight section 521 of the second sealing part 52 along the axial direction of the sealing ring 5 is 0.5-1 mm. The inner diameter of the second sealing part 52 is 1 mm larger than the diameter of the outlet of the liquid inlet 132. The thickness of the first sealing part 51 when it is not compressed is 5 mm. When the valve cap 12 locks the valve body 11 and the socket 13, the thickness of the first sealing part 51 is 3 mm.

[0045] The working principle of the spring check valve in this embodiment is as follows: During installation, the spring 4 is sleeved on the valve stem 3, one end of the spring 4 is inserted into the spring limiting groove 23, and the other end of the spring 4 is snapped between the four limiting protrusions 1141 of the spring limiting member 114. The gasket 113 is installed in the recess 112 on the top of the valve body 11. The mounting protrusion at the bottom of the sealing ring 5 is installed into the sealing groove formed by the gasket 113 and the protrusion, thereby installing the sealing ring 5 on the top of the valve body 11. The inlet end of the socket 13 is inserted into the valve cap 12, and the outlet end of the socket 13 is pressed onto the sealing ring 5. The position of the socket 13 is adjusted so that the axes of the socket 13, valve cap 12, valve body 11, valve cover and valve stem 3 are aligned. The valve cap 12 is rotated to lock the valve cap 12 onto the external thread of the valve body 11. The valve cap 12 presses the annular protrusion 131 at the bottom of the socket 13 onto the first sealing part 51 of the sealing ring 5, thus completing the installation.

[0046] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A spring check valve, characterized in that, The valve body assembly includes a valve body (1), a valve disc (2), a spring (4), and a sealing ring (5). The valve body assembly (1) has an inlet (132), a flow channel (118), and an outlet (119) connected in sequence. The valve disc (2) is movably installed in the flow channel (118). A spring limiting member (114) is fixedly installed in the flow channel (118). One end of the spring (4) abuts against the spring limiting member (114), and the other end abuts against one end of the valve disc (2). The sealing ring (5) is fixedly installed at the junction of the flow channel (118) and the inlet (132). The other end of the valve disc (2) abuts against the sealing ring (5). The inner wall of the flow channel (118) is provided with a guide structure (111) that can limit the movement direction of the valve disc (2).

2. The spring check valve according to claim 1, characterized in that, The guide structure (111) consists of multiple guide ribs, the wall surface of the guide ribs facing the valve disc (2) is parallel to the axis of the flow channel (118), and the valve disc (2) is located between the multiple guide ribs.

3. The spring check valve according to claim 2, characterized in that, The valve disc (2) is provided with two sets of lugs (22), and the two sets of lugs (22) respectively contact the two sides of one of the guide ribs.

4. The spring check valve according to claim 1, characterized in that, The valve disc (2) is fixedly connected to the valve stem (3) at one end that abuts against the spring (4). The spring (4) is sleeved on the valve stem (3). The spring limiting member (114) is provided with a second through hole (1142) through which the valve stem (3) can pass.

5. The spring check valve according to claim 1, characterized in that, The spring limiting member (114) is provided with a plurality of limiting protrusions (1141) extending toward the liquid inlet (132), and the end of the spring (4) that abuts against the spring limiting member (114) is located between the plurality of limiting protrusions (1141).

6. The spring check valve according to claim 5, characterized in that, The bottom of the valve disc (2) is provided with a spring limiting groove (23) that cooperates with the spring (4), and the spring (4) abuts against the spring limiting groove (23).

7. The spring check valve according to any one of claims 1 to 6, characterized in that, The sealing ring (5) is provided with an arc-shaped sealing surface (522), which abuts against the valve disc (2), and the surface of the valve disc (2) abutting against the arc-shaped sealing surface (522) is a spherical surface (21).

8. The spring check valve according to claim 7, characterized in that, The top of the inner side of the sealing ring (5) is also provided with a straight section (521) parallel to the flow direction of the fluid, and the straight section (521) is connected to the arc-shaped sealing surface (522).

9. The spring check valve according to any one of claims 1 to 6, characterized in that, The valve body assembly (1) includes a valve body (11), a valve cap (12), and a socket (13). The inlet (132) is located in the socket (13). The flow channel (118) and the outlet (119) are located in the valve body (11). The socket (13) passes through the valve cap (12). The valve body (11) and the socket (13) are detachably installed on the inner side of the valve cap (12). The sealing ring (5) includes a first sealing part (51) and a second sealing part (52). The second sealing part (52) is fixedly connected to the inner side of the first sealing part (51). One end of the first sealing part (51) abuts against the socket (13), and the other end abuts against the valve body (11). The second sealing part (52) abuts against the valve disc (2).

10. The spring check valve according to claim 9, characterized in that, The valve body (11) has a recessed platform (112) at the top, and a gasket (113) is installed in the recessed platform (112). The bottom of the second sealing part (52) abuts against the gasket (113). The gasket (113) and the side wall of the recessed platform (112) form a sealing groove. The bottom of the first sealing part (51) has a protrusion that cooperates with the sealing groove. The protrusion abuts against the sealing groove.

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