CN217301746U - Check valve - Google Patents

Abstract

The utility model discloses a check valve and a manufacturing method thereof, the check valve comprises a valve body, a valve core component, a movable support, a support component and a clamping elastic component, and the inner side wall of the valve body is provided with a valve block clamping table and a clamping groove; the valve core assembly is connected in the valve body and comprises a valve plate and a plurality of limiting rods which are connected to two sides of the valve plate and used for limiting the valve plate to move linearly; the movable support is arranged in the valve body, and is provided with a limiting hole movably connected with a limiting rod on one side of the valve plate; the support piece is arranged between the valve plate and the movable support to block the passage of the valve body when the valve plate moves to the movable support; the clamping elastic element is connected in the clamping groove to clamp the movable support in the valve body and limit the valve block to move linearly between the valve block clamping table and the movable support. The check valve is simple in overall structure, and each component is easy to manufacture or obtain, so that the production efficiency is improved, and the manufacturing cost is reduced. The manufacturing method of the check valve is simple and efficient, and saves materials and energy consumption.

Description

Check valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a check valve and manufacturing method thereof.

Background

The check valve is a valve with a circular valve clack and acts by self weight and medium pressure to block the medium from flowing backwards. It belongs to the automatic valve category, also called check valve, reflux valve or isolation valve. The media flows in from the inlet end and out from the outlet end. When the inlet pressure is greater than the sum of the flow resistances, the valve is opened. Otherwise, the valve is closed when the medium flows backwards.

The existing check valve mainly has a combined structure and an integrated structure, and the valve body is generally manufactured by casting. The combined check is small in mounting and dismounting difficulty, is a common check valve structure form in the market, but the valve body needs to be spliced, so the valve body is large, the problem of sealing defects or damage easily exists at the spliced part, the valve manufacturing process is relatively complex, the production efficiency is low, and the manufacturing cost is difficult to reduce; the integrated check valve does not need to be spliced, the valve body is smaller under the condition of the same flow, the problem of leakage of the integrated check valve is avoided, but the manufacturing process is relatively complex, the production efficiency is low, the manufacturing cost is difficult to reduce, and the problem of slippage and looseness exists in the movable support for internally connecting and supporting the valve rod and the service performance of the check valve is influenced; the existing check valves with two structural forms have the problem that the service performance of the check valve is affected because a valve core is easy to damage after long service time.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one defect of above-mentioned prior art, the utility model provides a check valve and manufacturing method to it is complicated to solve current check valve structure, and the preparation technology is complicated relatively, and production efficiency is low, the difficult problem that reduces of manufacturing cost.

The utility model discloses a solve the technical scheme that its problem adopted and be:

in a first aspect, the utility model discloses a check valve, include:

the valve body is provided with a valve block clamping table and a clamping groove on the inner side wall;

the valve core assembly is connected in the valve body and comprises a valve plate and a plurality of limiting rods which are connected to two sides of the valve plate and used for limiting the valve plate to move linearly;

the movable support is arranged in the valve body, and a limiting hole movably connected with the limiting rod on one side of the valve plate is formed in the movable support;

the support piece is arranged between the valve plate and the movable support to block the passage of the valve body when the valve plate moves to the movable support; and

the clamping elastic piece is connected in the clamping groove to clamp the movable support in the valve body and limit the valve block to move linearly between the valve block clamping table and the movable support.

The utility model provides a check valve blocks the passageway of valve block body when valve block removes to the movable support through setting up support piece, sets up valve block ka tai and screens groove in the valve body, and screens elastic component connects in the screens inslot to block the case subassembly in the valve body, overall structure is simple, and each component makes easily or obtains, improves production efficiency, reduces manufacturing cost.

As an optional implementation manner, in the embodiment of the present invention, the clamping elastic member is a hole clamp.

As an optional implementation mode, in the embodiment of the utility model, one the gag lever post connect in on the play water side centre of valve block, all the other gag lever post annular array locates on the side of intaking of valve block, and a plurality of that annular array set up the gag lever post respectively with the inside wall sliding connection of valve body, in order to restrict valve block linear motion.

As an optional implementation mode, in the embodiment of the utility model, be equipped with on the side of intaking of valve block and be located a plurality of that the annular array set up the sealing ring groove in the outside of gag lever post, the sealing ring inslot is connected with first sealing washer, so that the valve block with the shutoff when the valve block ka tai meets the passageway of valve body.

As an optional implementation manner, in the embodiment of the present invention, the supporting member includes a reset elastic member, the reset elastic member connects the valve plate with the movable support.

As an optional implementation manner, in the embodiment of the present invention, the elastic restoring element is a spring, and is sleeved on the limiting rod.

As an optional implementation manner, in the embodiment of the present invention, the supporting member includes a supporting member of a pipe structure, and the supporting member is sleeved on the limiting rod.

As an optional implementation manner, in the embodiment of the present invention, the supporting member includes a reset elastic member and a supporting member of a pipe structure, the reset elastic member connects the valve plate with the movable support, and the supporting member is sleeved on the limiting rod.

As an optional implementation mode, in the embodiment of the present invention, the inner wall of the outlet end of the valve body is provided with the second connecting thread, the inner side wall of the valve body is further provided with a sealing groove located beside the clamping groove and between the second connecting thread, and a second sealing ring is connected in the sealing groove, so that the valve body forms a seal after being connected with the pipe fitting.

In a second aspect, the utility model also discloses a manufacturing method of the check valve, the check valve comprises a valve body, a valve core component, a movable support, a support component and a clamping elastic component;

the valve body with the valve block clamping table and the clamping groove is manufactured through machine tool machining;

a valve plate with a sealing ring groove and a connecting through hole is manufactured through machining of a machine tool, then a first sealing ring and a limiting rod are correspondingly assembled into the sealing ring groove and the connecting through hole respectively, and a valve core assembly is manufactured;

a movable support with a limiting hole is manufactured through machine tool machining;

and placing the valve core assembly into the valve body, wherein one side of the valve block, which is provided with the first sealing ring, faces the valve block clamping table, then sequentially installing the supporting piece and the movable support, and finally installing the clamping elastic piece into the clamping groove of the valve body so as to tightly clamp the movable support and the valve core assembly in the valve body, thereby obtaining a finished check valve.

To sum up, the utility model discloses a check valve and manufacturing method thereof has following technological effect:

the utility model provides a check valve blocks the passageway of valve block body when valve block removes to the movable support through setting up support piece, sets up valve block ka tai and screens groove in the valve body, and screens elastic component connects in the screens inslot to block the case subassembly in the valve body, overall structure is simple, and each component makes easily or obtains, has improved production efficiency, reduces manufacturing cost. The optimized check valve structure reduces the complex manufacturing procedures of the manufacturing method of the check valve, simplifies the manufacturing method, improves the production efficiency, saves the materials and the energy consumption and reduces the manufacturing cost.

Other technical effects of the utility model point out in the specification in combination with specific structure.

Drawings

Fig. 1 is a schematic structural diagram of a check valve according to an embodiment of the present invention;

FIG. 2 is an exploded view of a check valve according to an embodiment of the present invention;

FIG. 3 is a schematic sectional view of the check valve according to the embodiment of the present invention when no liquid flows through the check valve;

FIG. 4 is a schematic sectional view of a check valve according to an embodiment of the present invention with liquid flowing through the check valve;

fig. 5 is a schematic structural section view of a valve body according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a valve core assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural section view of a valve core assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a movable support according to an embodiment of the present invention;

fig. 9 is a schematic structural view of the positioning elastic member according to the embodiment of the present invention.

Wherein the reference numerals have the following meanings:

1. a valve body; 11. the valve plate is clamped; 12. a holder groove; 13. a clamping groove; 14. a first connecting thread; 15. a second connecting thread; 2. a valve core assembly; 21. a valve plate; 211. sealing the ring groove; 212. a connecting through hole; 22. a limiting rod; 23. a first seal ring; 3. a movable support; 31. a limiting hole; 4. a support member; 5. the elastic part is clamped; 6. the elastic member is reset.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example one

Referring to fig. 1-9, the utility model discloses a check valve, which comprises a valve body 1, a valve core component 2, a movable support 3, a support component and a clamping elastic component 5; the inner side wall of the valve body 1 is provided with a valve plate clamping table 11 and a clamping groove 13; the valve core assembly 2 is connected in the valve body 1, and the valve core assembly 2 comprises a valve plate 21 and a plurality of limiting rods 22 which are connected to two sides of the valve plate 21 and used for limiting the valve plate 21 to move linearly; the movable support 3 is arranged in the valve body 1, and is provided with a limit hole 31 movably connected with the limit rod 22 at one side of the valve plate 21; the supporting piece is arranged between the valve plate 21 and the movable support 3 to block the passage of the valve body 1 when the valve plate 21 moves towards the movable support 3; the clamping elastic element 5 is connected in the clamping groove 13 to clamp the movable support 3 in the valve body 1 and limit the valve plate 21 to move linearly between the valve plate clamping table 11 and the movable support 3. The channel of the valve body 1 is blocked when the valve block 21 is moved to the movable support 3 through the support piece, the valve block clamping table 11 and the clamping groove 13 are arranged in the valve body 1, and the clamping elastic piece 5 is connected in the clamping groove 13, so that the valve core assembly 2 is clamped in the valve body 1, the whole structure is simple, all components are easy to manufacture or obtain, the production efficiency is improved, and the manufacturing cost is reduced.

Wherein, there is not complicated structure in the valve body 1, and the structure of its inside wall can be made by the lathe cutting. The valve body 1 is provided with a detachable support at one end for supporting the valve core assembly 2, and the other end is supported by the sliding connection of the limiting rod 22 and the inner wall of the valve body 1, so that the valve body 1 can be obtained by cutting and integrally forming a regular hexagonal prism profile through a machine tool. The regular hexagonal prism section is made of conventional materials and is easy to obtain, a ready-made outer hexagonal structure can be clamped conveniently by tools such as a wrench, complex procedures such as casting or injection molding are avoided, the manufacturing process is simplified, and the production efficiency is improved.

In addition, the limit hole 31 is located at the center of the movable support 3, and the limit rod 22 is also located at the center of the valve plate 21. When the valve core component 2 moves in the valve body 1, the situation that the valve plate 21 deviates to cause the limiting rod 22 to be clamped can not occur. The movable support 3 is a strip-shaped block sheet, the obstruction to the channel can be reduced, the two ends of the movable support are arranged to be arc-shaped, the two ends of the movable support are closer to the inner wall of the valve body 1, the contact area between the movable support and the clamping elastic piece 5 is increased, and the movable support 3 can be clamped by the clamping elastic piece 5. The cradle 3 can be obtained by blanking with a machine tool.

The movable support 3 does not collide with the inner wall of the valve body 1 in the valve body 1 and can be clamped in the valve body 1 by the clamping elastic piece 5. In some embodiments, referring to fig. 3-5, the inner side wall of the valve body 1 is further provided with a seat groove 12 for accommodating the movable seat 3, and the seat groove 12 is located on the side of the detent groove 13 away from the water outlet of the valve body 1. The movable range of the movable support 3 is limited through the support groove 12, the integral structure is optimized, the movable support 3 is prevented from damaging the movable support or other components in a larger movable range, and the service life is prolonged. Further, in some embodiments, the seat groove 12 and the detent groove 13 are combined into a single groove body, thereby facilitating the processing.

Referring to fig. 6 and 7, the valve plate 21 is provided with a connecting through hole 212 for connecting the limiting rod 22. The valve plate 21 and the limiting rod 22 can be processed separately and then assembled to obtain the valve core assembly 2. Therefore, the valve plate 21 and the limiting rod 22 are easy to process and obtain, the production process is simplified, and the production efficiency is improved. In addition, the connecting through hole 212 is in interference fit with the limiting rod 22 to ensure that the limiting rod 22 does not generate relative displacement with the valve plate 21 in the using process.

Referring to fig. 2, 3, 4 and 9, in some embodiments, the elastic locking member 5 is a hole lock. The blocking elastic element 5 is used for blocking the movable support 3 in the channel of the valve body 1. In order to reduce blocking of the channel section of the valve body 1 by the blocking elastic member 5, therefore, the embodiment of the present invention provides an embodiment in which the blocking elastic member 5 can adopt a hole clamp which can not block the channel but also play a blocking role. The hole card can be installed into the channel by means of circlip pliers.

Referring to fig. 2-4, fig. 6 and fig. 7, in some embodiments, one limiting rod 22 is connected to the center of the water outlet side of the valve plate 21, the other limiting rods 22 are arranged in an annular array on the water inlet side of the valve plate 21, and the plurality of limiting rods 22 arranged in the annular array are respectively connected to the inner side wall of the valve body 1 in a sliding manner to limit the linear motion of the valve plate 21. The embodiment of the present invention uses five position-limiting rods 22 as an example. A limiting rod 22 is arranged on one side of the valve plate 21 and is connected with the limiting hole 31 in a sliding manner; the four limiting rods 22 are arranged on the other side of the valve plate 21 and are respectively connected with the inner side wall of the valve body 1 in a sliding mode. Therefore, a fixed support does not need to be arranged on the valve body 1, the structure of the valve body 1 is simplified, and the manufacturing difficulty of the valve body 1 is reduced. The water inlet of the valve body 1 is not provided with a support, liquid enters the valve body 1 without obstruction, and the valve plate 21 is pushed more easily to enable the valve body 1 to be communicated. The edge of the water outlet side of the valve plate 21 is chamfered, so that the thickness of the edge of the valve plate 21 is reduced, and liquid can conveniently cross the valve plate 21 and flow out.

Referring to fig. 2-4, fig. 6 and fig. 7, in some embodiments, a sealing ring groove 211 is disposed on the water inlet side of the valve plate 21 and located outside the plurality of limiting rods 22 arranged in an annular array, and a first sealing ring 23 is connected in the sealing ring groove 211 to block the channel of the valve body 1 when the valve plate 21 is connected to the valve plate retainer 11. In this way, a first sealing ring 23 is provided on the water inlet side of the valve plate 21 for achieving a non-return seal of the check valve. On one hand, the first sealing ring 23 is in front contact with the valve plate clamping table 11, friction between the first sealing ring 23 and the valve body 1 can be reduced, the probability of damage to the first sealing ring 23 is reduced, and the service life of the first sealing ring 23 is prolonged; on the other hand, sealing ring groove 211 sets up on the side of intaking of valve block 21, and first sealing washer 23 imbeds in sealing ring groove 211 to when making valve block 21 meet with valve block ka tai 11, the extrusion force that first sealing washer 23 received is even, can not take place the skew when the extrusion, and the leakproofness is good. In addition, the width of the sealing ring groove 211 and the thickness of the first sealing ring 23 can be reduced, so that the first sealing ring 23 can be made of a sealing material which is expensive due to good sealing performance, without causing an excessive increase in the cost of the check valve. Further, the seal ring groove 211 may be configured to have a wide groove bottom and a narrow groove opening, so that the first seal ring 23 is accommodated therein and is not easily separated by water impact. The mode of setting up of seal ring groove 211 still is favorable to the processing of valve block 21, fixes on the workstation, and it can make to drill.

Referring to fig. 2-4, in some embodiments, the supporting element includes a return elastic element 6 and a supporting element 4 of a pipe structure, the return elastic element 6 connects the valve plate 21 and the movable support 3, and the supporting element 4 is sleeved on the limiting rod 22. On one hand, the supporting piece 4 can better separate the valve plate 21 from the movable support 3, the flow value of the valve body 1 can be ensured to be maximum when the valve body 1 is communicated, and the situation that the flow value is too small due to the fact that the channel of the valve body 1 is blocked when the valve plate 21 moves away from the valve plate clamping table 11 is avoided; on the other hand, the supporting member 4 can limit the compression amount of the elastic restoring member 6, maintain the elastic function of the elastic restoring member 6, and avoid the elastic deformation of the elastic restoring member 6 caused by long-time over-compression and then the failure. The arrangement of the reset elastic piece 6 can enable the check valve to be in a normally closed state, limit the position of the valve plate 21, avoid the collision damage of the check valve due to random movement, prolong the service life, enlarge the application range and enable the check valve to be used under the condition of inversion. The spring is made easily and is obtained, can reduce the cost of component, the embodiment of the utility model provides an use the elastic component 6 that resets as the spring example, it cup joints on gag lever post 22, nevertheless in the actual production application, the elastic component 6 that resets can also adopt shell fragment etc. to have and restore to the throne and can not excessively account for the component in space after the compressible.

In some embodiments, the inner wall of the outlet end of the valve body 1 is provided with a second connecting thread 15, a sealing groove located beside the clamping groove 13 and between the second connecting thread 15 is further provided on the inner wall of the valve body 1, and a second sealing ring is connected in the sealing groove, so that the valve body 1 is connected with a pipe fitting to form a seal. The second sealing ring is assembled in the valve body 1, so that the storage and the transportation are convenient. In addition, the outer wall of the inlet end of the valve body 1 is provided with a first connecting thread 14 for externally connecting a pipe.

When liquid enters from the water inlet end of the valve body 1, the liquid impacts the valve plate 21 to compress the elastic resetting piece 6, the support piece limits the compression amount of the elastic resetting piece 6, so that the channel in the valve body 1 is kept to be a channel, and the liquid smoothly flows through the check valve and flows out from the water outlet end of the valve body 1; when no liquid continuously fills the water inlet end of the valve body 1, the valve plate 21 is reset under the action of the reset elastic piece 6, the first sealing ring 23 is connected with the valve plate clamping table 11, the channel of the valve body 1 is closed, the liquid can not flow back through the channel of the valve body 1, and the liquid in the valve body 1 has an extrusion effect on the valve plate 21, so that the sealing effect of the first sealing ring 23 is improved.

The utility model also discloses a manufacturing method of the check valve, the check valve comprises a valve body 1, a valve core component 2, a movable support 3, a support piece and a clamping elastic piece 5;

the specific related components can be selected according to the valve body 1, the valve plate 21 and the movable support 3, such as the first sealing ring 23, the limiting rod 22, the support member 4, the clamping elastic member 5 and the second sealing ring.

The valve body 1 with the valve block clamping table 11 and the clamping groove 13 is manufactured by machine tool processing;

the valve body 1 adopts a regular hexagonal prism section as an original blank and is integrally formed by machining through a machine tool. The valve body 1 is manufactured through machine tool machining, and compared with casting, the valve body is higher in reliability and simple in process. Cutting the regular hexagonal prism according to the length of the valve body 1 to obtain a blank of the valve body 1; clamping the blank of the valve body 1 on a lathe, and machining the valve block clamping table 11, the clamping groove 13, the sealing groove, the clamping groove 13, the first connecting thread 14 and the second connecting thread 15 of the valve body 1 by adopting corresponding turning tools.

The valve plate 21 with the sealing ring groove 211 and the connecting through hole 212 is manufactured through machining by a machine tool, and then the first sealing ring 23 and the limiting rod 22 are correspondingly assembled in the sealing ring groove 211 and the connecting through hole 212 respectively to manufacture the valve core assembly 2;

specifically, the valve plate 21 is integrally formed by machining a cylindrical section as an original blank through a multi-axis numerical control machine. Cutting the cylinder according to the thickness of the valve plate 21 to obtain a blank of the valve plate 21; and (3) fixing the blank of the valve plate 21 on a multi-axis numerical control machine tool, and machining the connecting through hole 212 and the sealing ring groove 211 of the valve plate 21 by using a turning tool. Placing the valve plate 21 on a workbench, wherein the workbench is provided with a hole corresponding to the connecting through hole 212 of the valve plate 21, and the size of the hole is slightly larger than the diameter of the limiting rod 22; then, the limiting rod 22 is pressed into the connecting through hole 212 of the valve plate 21 through a press-fitting tool, the limiting rod 22 on the water outlet side of the valve plate 21 is installed, and then the valve plate 21 is turned over to perform the safety rotation of the limiting rod 22 on the water inlet side of the valve plate 21; finally, a sealing ring groove 212 with a circular ring plane pressure head is used for pressing the first sealing ring 23 against the valve plate 21.

The movable support 3 with the limiting hole 31 is manufactured through machine tool machining; specifically, the movable support 3 is directly manufactured by a blanking machine tool.

The check valve is characterized in that the valve core assembly 2 is placed into the valve body 1, one side, provided with the first sealing ring 23, of the valve plate 21 faces the valve plate clamping table 11, then the supporting piece and the movable support 3 are sequentially installed, finally the clamping elastic piece 5 is installed in the clamping groove 13 of the valve body 1 through the snap spring clamp, the movable support 3 and the valve core assembly 2 are clamped in the valve body 1, and then the second sealing ring is installed in the sealing groove, so that a finished check valve is obtained.

The utility model provides a check valve blocks the passageway of shutoff valve body 1 when valve block 21 removes to movable support 3 through setting up support piece, sets up valve block ka tai 11 and screens groove 13 in the valve body 1, screens elastic component 5 is connected in screens groove 13 to with case subassembly 2 restriction in valve body 1, overall structure is simple, and each component is made easily or is obtained, has improved production efficiency, reduces manufacturing cost. The optimized check valve structure reduces the complex manufacturing procedures in the manufacturing method of the check valve, simplifies the manufacturing method, can improve the production efficiency, saves materials and energy consumption, and reduces the manufacturing cost.

Example two

The difference between the two embodiments is that the support member in this embodiment includes the elastic return member 6, and the elastic return member 6 connects the valve plate 21 and the movable support 3. The arrangement of the reset elastic piece 6 can enable the check valve to be in a normally closed state, limit the position of the valve plate 21, avoid the collision damage of the check valve due to random movement, prolong the service life, enlarge the application range and enable the check valve to be used under the condition of inversion. The spring is made easily and is obtained, can reduce the cost of component, the embodiment of the utility model provides an use the elastic component 6 that resets as the spring example, it cup joints on gag lever post 22, nevertheless in the actual production application, the elastic component 6 that resets can also adopt shell fragment etc. to have and restore to the throne and can not excessively account for the component in space after the compressible.

EXAMPLE III

The embodiment is different from other embodiments in that the supporting member in this embodiment includes a supporting member 4 of a pipe structure, and the supporting member 4 is sleeved on the limiting rod 22. The embodiment of the utility model provides an in, do not establish the elastic component 6 that resets and also can reach the effect of non return to the liquid that flows through the check valve, but valve block 21 removes in valve body 1 easily, has increased valve block 21 and valve body 1's collision probability, leads to the damage probability increase of valve block 21, and can not be applied to in the pipeline network that leads to gas. Therefore, on one hand, the supporting piece 4 can be arranged to separate the valve plate 21 from the movable support 3, so that the flow value of the valve body 1 can be ensured to be maximum when the valve body 1 is communicated, and the situation that the flow value is too small because the valve plate 21 blocks the channel of the valve body 1 when moving away from the valve plate clamping platform 11 is avoided; on the other hand, the support member 4 is arranged to shorten the moving distance between the valve plate 21 and the movable support 3 and reduce the impact force of the valve plate and the movable support.

The technical means disclosed in the present invention is not limited to the technical means disclosed in the above embodiments, but also includes the technical solution formed by arbitrarily combining the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (9)

1. A check valve, comprising:

the valve body (1), the inside wall of the valve body (1) is provided with a valve block clamping table (11) and a clamping groove (13);

the valve core assembly (2) is connected in the valve body (1), and the valve core assembly (2) comprises a valve plate (21) and a plurality of limiting rods (22) which are connected to two sides of the valve plate (21) and used for limiting the valve plate (21) to move linearly;

the movable support (3) is arranged in the valve body (1), and a limiting hole (31) movably connected with the limiting rod (22) on one side of the valve plate (21) is formed in the movable support (3);

the supporting piece is arranged between the valve plate (21) and the movable support (3) to block the passage of the valve body (1) when the valve plate (21) moves to the movable support (3); and

screens elastic component (5), screens elastic component (5) connect in screens groove (13), in order to block movable support (3) in valve body (1), the restriction valve block (21) in valve block card platform (11) with rectilinear movement between movable support (3).

2. The non-return valve according to claim 1, characterized in that the snap-in elastic element (5) is a hole snap.

3. The check valve according to claim 1 or 2, wherein one of the limiting rods (22) is connected to the center of the water outlet side of the valve plate (21), the rest of the limiting rods (22) are arranged on the water inlet side of the valve plate (21) in an annular array, and the plurality of limiting rods (22) arranged in the annular array are respectively connected with the inner side wall of the valve body (1) in a sliding manner so as to limit the linear motion of the valve plate (21).

4. The check valve according to claim 3, wherein a sealing ring groove (211) is formed in the water inlet side of the valve plate (21) and located outside the plurality of limiting rods (22) arranged in an annular array, and a first sealing ring (23) is connected in the sealing ring groove (211) so as to block the passage of the valve body (1) when the valve plate (21) is connected with the valve plate clamping table (11).

5. The non-return valve according to claim 4, characterized in that the support comprises a return spring (6), the return spring (6) connecting the valve plate (21) with the mobile seat (3).

6. The non-return valve according to claim 5, characterized in that the return elastic element (6) is a spring, which is sleeved on the limit rod (22).

7. The non-return valve according to claim 4, characterized in that the support comprises a tubular support (4), the support (4) being sleeved on the stop rod (22).

8. The check valve according to claim 4, characterized in that the support member comprises a return elastic member (6) and a support member (4) of a pipe structure, the return elastic member (6) connects the valve plate (21) and the movable support (3), and the support member (4) is sleeved on the limit rod (22).

9. The check valve according to any one of claims 5 to 8, characterized in that the inner wall of the outlet end of the valve body (1) is provided with a second connecting thread (15), a sealing groove is further arranged on the inner side wall of the valve body (1) and located beside the clamping groove (13) and between the second connecting thread (15), and a second sealing ring is connected in the sealing groove, so that the valve body (1) is sealed after being connected with a pipe fitting.

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