Leak-proof check valve

Abstract

The utility model discloses a kind of anti-leak check valves, including first valve body (1), the left end of first valve body (1) is equipped with first end plate (2), the right end of first valve body (1) is connected with the left end of second valve body (3), the right end of second valve body (3) is equipped with second end plate (4), first valve body (1) is equipped with first valve clack assembly in, second valve body (3) is provided with second valve clack assembly in.The utility model can effectively prevent liquid backflow, more stable and reliable, and service life is longer, maintenance cost is lower.

Description

Technical Field

[0001] This utility model relates to a check valve, and more particularly to a leak-proof check valve. Background Technology

[0002] Traditional check valves are prone to incomplete closure due to impurities getting stuck between the valve disc and seat, or damage to the sealing surface from friction with particles. This allows fluid to flow back, causing the check valve to malfunction. Furthermore, problems with the internal components or valve body cannot be replaced individually, necessitating the replacement of the entire valve, leading to increased costs and wasted funds. Utility Model Content

[0003] The purpose of this utility model is to provide a leak-proof check valve to solve the technical problems in the prior art. It can effectively prevent liquid backflow, is more stable and reliable, has a longer service life, and lower maintenance costs.

[0004] This utility model provides a water-proof check valve, including a first valve body, a first end plate installed on the left end of the first valve body, the right end of the first valve body connected to the left end of a second valve body, a second end plate installed on the right end of the second valve body, a first valve disc assembly provided in the first valve body, and a second valve disc assembly provided in the second valve body.

[0005] In the aforementioned anti-leakage check valve, preferably, the left end of the first valve body has a first flange, the right end of the first valve body has a second flange, the left end face of the first flange is provided with a first end plate mounting groove, and a first threaded hole is provided in the first end plate mounting groove.

[0006] In the aforementioned anti-leakage check valve, preferably, a first countersunk hole is formed on the first end plate, the first countersunk hole is opposite to the first threaded hole, the first end plate is installed in the first end plate mounting groove and fixed to the first flange by the first screw, and a first valve seat is provided on the right end face of the first end plate.

[0007] In the aforementioned anti-leakage check valve, preferably, the right end of the first valve body has a connecting end plate, the connecting end plate has a liquid flow channel, the left end face of the connecting end plate has a second valve seat, and the right end face of the connecting end plate has a third valve seat.

[0008] In the aforementioned anti-leakage check valve, preferably, the first valve disc assembly includes a first valve disc and a first spring, the left end of the first spring is connected to the first valve disc, the right end of the first spring is sleeved and fixed on the second valve seat, and the left end face of the first valve disc abuts against the first valve seat.

[0009] In the aforementioned anti-leakage check valve, preferably, the left end of the second valve body has a third flange, the right end of the second valve body has a fourth flange, a ring of second threaded holes is opened on the left end face of the third flange, a ring of second countersunk holes is opened on the second flange, the second countersunk holes and the second threaded holes are opposite to each other, a second screw is provided in the second countersunk hole, and the second screw is threadedly connected to the second threaded hole.

[0010] In the aforementioned anti-leakage check valve, preferably, a second end plate mounting groove is provided on the right end face of the fourth flange, and a third threaded hole is provided in the second end plate mounting groove.

[0011] In the aforementioned anti-leakage check valve, preferably, a ring of third countersunk holes is formed on the second end plate, the third countersunk holes are opposite to the third threaded holes, the second end plate is installed in the second end plate mounting groove and fixed to the fourth flange by the third screw, and a fourth valve seat is provided on the left end face of the second end plate.

[0012] In the aforementioned anti-leakage check valve, preferably, the second valve disc assembly includes a second valve disc and a second spring, the left end of the second spring is connected to the second valve disc, the right end of the second spring is sleeved and fixed on the fourth valve seat, and the left end face of the second valve disc abuts against the third valve seat.

[0013] Compared with the prior art, this utility model sets a first valve disc assembly in the first valve body and a second valve disc assembly in the second valve body. With the setting of two valve disc assemblies, if one valve disc assembly fails, the other valve disc assembly can continue to work, which can effectively prevent liquid backflow, making it more stable and reliable, and with a longer service life. Attached Figure Description

[0014] Figure 1 This is a sectional view of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the first valve body of this utility model;

[0016] Figure 3 This is a cross-sectional view of the second valve body of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. First valve body; 2. First end plate; 3. Second valve body; 4. Second end plate; 5. First flange; 6. Second flange; 7. First end plate mounting groove; 8. First threaded hole; 9. First countersunk hole; 10. First screw; 11. First valve seat; 12. Connecting end plate; 13. Liquid flow channel; 14. Second valve seat; 15. Third valve seat; 16. First valve disc; 17. First spring; 18. Third flange; 19. Fourth flange; 20. Second threaded hole; 21. Second countersunk hole; 22. Second screw; 23. Second end plate mounting groove; 24. Third threaded hole; 25. Third countersunk hole; 26. Third screw; 27. Fourth valve seat; 28. Second valve disc; 29. ​​Second spring; 30. Liquid inlet; 31. Liquid outlet; 32. First sealing gasket; 33. Second sealing gasket; 34. Third sealing gasket; 35. First mounting hole; 36. Second mounting hole; 37. First sealing gasket mounting groove; 38. Second sealing gasket mounting groove; 39. Mounting boss. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Embodiments of this utility model: such as Figures 1-3 As shown, a leak-proof check valve includes a first valve body 1 and a second valve body 3. A first end plate 2 is installed on the left end of the first valve body 1, and the first end plate 2 has an inlet hole 30. The right end of the first valve body 1 is connected to the left end of the second valve body 3. A second end plate 4 is installed on the right end of the second valve body 3, and the second end plate 4 has an outlet hole 31. A first valve disc assembly is provided inside the first valve body 1, and a second valve disc assembly is provided inside the second valve body 3.

[0020] By setting a first valve disc assembly in the first valve body 1 and a second valve disc assembly in the second valve body 3, the backflow of liquid is mainly achieved by the second valve disc during normal operation. When the second valve disc assembly fails to seal properly, the first valve disc assembly can continue to prevent backflow of liquid. This effectively improves the backflow prevention effect of the anti-leakage check valve, making the check valve more stable, reliable, and with a longer service life.

[0021] The first valve body 1, the second valve body 3, the first end plate 2, the second end plate 4, the first valve disc assembly, and the second valve disc assembly are all detachable structures. When a component is damaged, it can be replaced individually, effectively reducing operating costs. During long-term use, even two or more faulty check valves can be assembled into one or more functional check valves, further saving costs.

[0022] Specifically, the left end of the first valve body 1 has a first flange 5, and a ring of first mounting holes 35 are provided on the first flange 5. The first flange 5 can be fixedly connected to the flange on the pipeline by using bolts through the first mounting holes 35. The right end of the first valve body 1 has a second flange 6, and a first end plate mounting groove 7 is provided on the left end face of the first flange 5. A ring of first threaded holes 8 is provided in the first end plate mounting groove 7.

[0023] A first countersunk hole 9 is formed on the first end plate 2. The first countersunk hole 9 is opposite to the first threaded hole 8. The first end plate 2 is installed in the first end plate mounting groove 7 and fixed to the first flange 5 by the first screw 10. The right end face of the first end plate 2 has a first valve seat 11.

[0024] The first end plate 2 is fixed to the first flange 5 by the first screw 10, which facilitates the maintenance and replacement of the first end plate 2.

[0025] To ensure the sealing effect at the connection between the first end plate 2 and the first flange 5, a first sealing gasket mounting groove 37 is preferably provided at the bottom of the first end plate mounting groove 7 on the left end face of the first flange 5. A first sealing gasket 32 ​​is installed in the first sealing gasket mounting groove 37, and leakage can be effectively prevented by the first sealing gasket 32.

[0026] Furthermore, the right end of the first valve body 1 has a connecting end plate 12, on which a liquid flow channel 13 is provided. The left end face of the connecting end plate 12 has a second valve seat 14, and the right end face of the connecting end plate 12 has a third valve seat 15.

[0027] The first valve assembly includes a first valve disc 16 and a first spring 17. The left end of the first spring 17 is connected to the first valve disc 16, and the right end of the first spring 17 is sleeved and fixed on the second valve seat 14. The left end face of the first valve disc 16 abuts against the first valve seat 11.

[0028] Under the action of the first spring 17, the first valve disc 16 abuts against the first valve seat 11. When the fluid flows into the inlet hole 30, it applies pressure to the first valve disc 16. Under the pressure of the fluid, the first valve disc 16 pushes against the first spring 17, the first spring 17 is compressed, and the first valve disc 16 separates from the first valve seat 11, so that the fluid enters the cavity of the first valve body 1 through the gap between the first valve disc 16 and the first valve seat 11.

[0029] When no liquid flows into the inlet hole 30, the first spring 17 pushes the first valve disc 16, and the first valve disc 16 abuts against the first valve seat 11 to prevent the liquid from flowing backward.

[0030] Furthermore, the left end of the second valve body 3 has a third flange 18, and the right end of the second valve body 3 has a fourth flange 19. A ring of second threaded holes 20 is opened on the left end face of the third flange 18, and a ring of second countersunk holes 21 is opened on the second flange 6. The second countersunk holes 21 and the second threaded holes 20 are opposite each other. A second screw 22 is provided in the second countersunk hole 21, and the second screw 22 is threadedly connected to the second threaded hole 20.

[0031] A mounting boss 39 is formed on the right end face of the connecting end plate 12. The outer diameter of the mounting boss 39 is equal to the inner diameter of the third flange 18. The third flange 18 is mounted on the mounting boss 39, and the second flange 6 and the third flange 18 are fixed together using the second screw 22.

[0032] To prevent leakage at the connection surface between the second flange 6 and the third flange 18, a second sealing gasket 33 is also installed on the mounting boss 39. The second sealing gasket 33 can effectively prevent liquid from leaking out between the second flange 6 and the third flange 18.

[0033] Furthermore, a second end plate mounting groove 23 is provided on the right end face of the fourth flange 19, and a ring of third threaded holes 24 is provided in the second end plate mounting groove 23.

[0034] The second end plate 4 has a ring of third countersunk holes 25, which are opposite to the third threaded holes 24. The second end plate 4 is installed in the second end plate mounting groove 23 and fixed to the fourth flange 19 by the third screw 26. The left end face of the second end plate 4 has a fourth valve seat 27.

[0035] To ensure a good seal at the connection between the second end plate 4 and the fourth flange 19, a second sealing gasket mounting groove 38 is preferably provided at the bottom of the second end plate mounting groove 23 on the right end face of the fourth flange 19. A third sealing gasket 34 is installed in the second sealing gasket mounting groove 38, which can effectively prevent leakage.

[0036] The second valve assembly includes a second valve disc 28 and a second spring 29. The left end of the second spring 29 is connected to the second valve disc 28, and the right end of the second spring 29 is sleeved and fixed on the fourth valve seat 27. The left end face of the second valve disc 28 abuts against the third valve seat 15.

[0037] When the fluid flows into the liquid flow channel 13, it applies pressure to the second valve disc 28. Under the pressure of the fluid, the second valve disc 28 pushes against the second spring 29, and the second spring 29 is compressed. The second valve disc 28 is separated from the third valve seat 15, so that the fluid enters the cavity of the second valve body 3 through the gap between the second valve disc 28 and the third valve seat 15.

[0038] When no liquid flows into the liquid channel 13, the second spring 29 pushes the second valve disc 28, which abuts against the third valve seat 15 to prevent the liquid from flowing backward.

[0039] Even after long-term operation, if the surfaces of the second valve disc 28 and the third valve seat 15 become damaged and the seal is not tight, or if impurities adhere between the second valve disc 28 and the third valve seat 15, causing incomplete closure, fluid may enter the cavity of the first valve body 1 through the liquid flow channel 13. In this case, the fluid pressure and the elastic force of the first spring 17 work together to press against the first valve disc 16, causing the first valve disc 16 to fit tightly against the first valve seat 11. Due to the sealing effect of the first valve disc 16 and the first valve seat 11, the backflow of fluid is prevented from exiting the check valve, ultimately preventing the fluid from flowing back through the inlet hole 30. Therefore, the two sealing structures—the first valve disc 16 and the first valve seat 11, and the second valve disc 28 and the third valve seat 15—can effectively prevent fluid backflow and greatly extend the service life of the check valve.

[0040] In this embodiment, the first valve seat 11, the second valve seat 14, the third valve seat 15, and the fourth valve seat 27 are manufactured using the same process, and their inner and outer diameters and lengths are equal. When both the first valve disc 16 and the first valve seat 11, and the second valve disc 28 and the third valve seat 15, experience sealing problems, the first screw 10 and the third screw 26 can be removed, the first end plate 2 and the second end plate 4 can be separated, the first spring 17 can be connected to the first valve seat 11, and the other side of the first valve disc 16 can be connected to the first spring 17, so that the first valve disc 16 and the second valve seat 14 form a new seal; similarly, the second spring 29 can be connected to the third valve seat 15, and the other side of the second valve disc 28 can be connected to the second spring 29, so that the second valve disc 28 and the fourth valve seat 27 form a new seal. At this point, after reassembling the first end plate 2 and the second end plate 4, the liquid outlet 31 of the check valve will become the liquid inlet, and the liquid inlet 30 will become the liquid outlet. The check valve will then form a new check valve with a better sealing structure. Installing the check valve upside down on the original pipeline will allow the fluid to flow in only one direction.

[0041] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A leak-proof check valve, comprising a first valve body (1), characterized in that: The first valve body (1) has a first end plate (2) installed on its left end. The right end of the first valve body (1) is connected to the left end of the second valve body (3). The right end of the second valve body (3) has a second end plate (4) installed on its right end. The first valve body (1) has a first valve disc assembly, and the second valve body (3) has a second valve disc assembly.

2. The anti-leakage check valve according to claim 1, characterized in that: The first valve body (1) has a first flange (5) at its left end and a second flange (6) at its right end. A first end plate mounting groove (7) is provided on the left end face of the first flange (5), and a first threaded hole (8) is provided in the first end plate mounting groove (7).

3. The anti-leakage check valve according to claim 2, characterized in that: The first end plate (2) has a ring of first countersunk holes (9), which are opposite to the first threaded holes (8). The first end plate (2) is installed in the first end plate mounting groove (7) and fixed to the first flange (5) by the first screw (10). The right end face of the first end plate (2) has a first valve seat (11).

4. The anti-leakage check valve according to claim 3, characterized in that: The first valve body (1) has a connecting end plate (12) at its right end, a liquid flow channel (13) is provided on the connecting end plate (12), a second valve seat (14) is provided on the left end face of the connecting end plate (12), and a third valve seat (15) is provided on the right end face of the connecting end plate (12).

5. The anti-leakage check valve according to claim 4, characterized in that: The first valve assembly includes a first valve disc (16) and a first spring (17). The left end of the first spring (17) is connected to the first valve disc (16), and the right end of the first spring (17) is sleeved and fixed on the second valve seat (14). The left end face of the first valve disc (16) abuts against the first valve seat (11).

6. The anti-leakage check valve according to claim 4, characterized in that: The second valve body (3) has a third flange (18) at its left end and a fourth flange (19) at its right end. A ring of second threaded holes (20) is opened on the left end face of the third flange (18). A ring of second countersunk holes (21) is opened on the second flange (6). The second countersunk holes (21) are opposite to the second threaded holes (20). A second screw (22) is provided in the second countersunk hole (21). The second screw (22) is threadedly connected to the second threaded hole (20).

7. The anti-leakage check valve according to claim 6, characterized in that: The right end face of the fourth flange (19) is provided with a second end plate mounting groove (23), and a ring of third threaded holes (24) is provided in the second end plate mounting groove (23).

8. The anti-leakage check valve according to claim 7, characterized in that: The second end plate (4) has a ring of third countersunk holes (25), which are opposite to the third threaded holes (24). The second end plate (4) is installed in the second end plate mounting groove (23) and fixed to the fourth flange (19) by the third screw (26). The left end face of the second end plate (4) has a fourth valve seat (27).

9. The anti-leakage check valve according to claim 8, characterized in that: The second valve assembly includes a second valve disc (28) and a second spring (29). The left end of the second spring (29) is connected to the second valve disc (28), and the right end of the second spring (29) is sleeved and fixed on the fourth valve seat (27). The left end face of the second valve disc (28) abuts against the third valve seat (15).

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