Double-seal check valve

Abstract

The utility model discloses a double-seal check valve, which relates to the technical field of check valves and comprises a valve body, the right side and the left side of the valve body are respectively provided with a right flange and a left flange, the inner side of the valve body is provided with a valve seat, the inner side of the valve seat is movably connected with a valve core, the side surface of the valve core is fixedly connected with a valve rod, and the valve rod is fixedly connected with a valve rod. The double-seal check valve is characterized in that a valve clack is arranged on the valve seat, a valve rod is arranged on the valve clack, a lantern ring is movably connected to the outer side of the valve rod, and a rubber soft seal located on the side face of the valve element is arranged on the inner side of the valve seat. The front end of the rubber soft sealing ring is compressed along with increase of pressure, the metal sealing face of the valve clack makes contact with the valve seat, at the moment, double sealing plays a sealing role at the same time, the sealing performance and the noise elimination characteristic of soft sealing are achieved, the water hammer impact resistance of hard sealing is achieved, and zero leakage is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, and particularly relates to a double-sealing check valve. Background Art

[0002] A check valve refers to a valve whose closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the action of the medium pressure. It belongs to the category of automatic valves and is also called a non-return valve, a one-way valve, a reflux valve or an isolation valve. The movement mode of the valve flap is divided into a lifting type and a swing type. The lifting check valve is similar in structure to a globe valve, only lacking a valve stem for driving the valve flap. The medium enters from the inlet end (the swing check valve has an inclined valve flap that can rotate around an axis, and its working principle is similar to that of the lifting check valve). Check valves are commonly used as bottom valves for pumping devices to prevent the backflow of water. When used in combination with a globe valve, it can play a role in safety isolation. The disadvantages are large resistance and poor sealing performance when closed.

[0003] After retrieval, a swing check valve with a slow-closing mechanism and a water hammer prevention check valve built-in, with the publication number CN201910575884.6, includes a swing check valve disc, a swing check valve body, and a swing check valve seat; a swing check valve flow channel is provided in the swing check valve body; the swing check valve body and the swing check valve seat are fixed; it is characterized in that: it further includes a slow-closing mechanism and a water hammer prevention check valve; a middle hole is provided in the swing check valve disc, the middle hole runs through the swing check valve disc from left to right, and the middle hole constitutes the flow channel of the water hammer prevention check valve; the middle hole is divided into a left part of the middle hole and a right part of the middle hole; the water hammer prevention check valve includes an elastic member, a water hammer prevention check valve disc, and a water hammer prevention check valve cover; the water hammer prevention check valve cover is fixed on the swing check valve disc; the water hammer prevention check valve disc is slidably installed in the right part of the middle hole, and the water hammer prevention check valve disc cooperates with the left part of the middle hole; one end of the elastic member is connected to the water hammer prevention check valve disc, and the other end is connected to the water hammer prevention check valve cover; the slow-closing mechanism includes a cover plate, a bellows, a guide seat, and a mounting seat; the mounting seat is fixed on the swing check valve seat; the cover plate is fixed on the mounting seat, and a cover plate inner hole is provided on the cover plate, and the cover plate inner hole is communicated with the swing check valve flow channel; the guide seat is slidably installed in the mounting seat, and the guide seat cooperates with the swing check valve disc; one end of the bellows is connected to the guide seat, and the other end is connected to the cover plate, and the lumen of the bellows is communicated with the cover plate inner hole. The slow-closing mechanism makes the swing check valve disc close slowly, preventing premature and excessive wear of the sealing surface; the water hammer prevention check valve plays a role in preventing water hammer. At the same time, the slow-closing mechanism and the water hammer prevention check valve are all inside the valve body, there is no external leakage point, the external dimension of the valve is not increased, the installation space of the valve is not restricted in any way, and at the same time the reliability of the valve is improved. There is no external leakage point, the valve structure is more compact, and it has the dual functions of preventing water hammer and improving the service life of the valve sealing surface. When the existing check valve is working, its sealing performance and sound absorption performance are both poor, and its ability to resist water hammer impact is poor, resulting in cracks on the surface of the check valve after long-term work. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a double-sealing check valve to solve the problems that when the existing check valve is working, its sealing performance and sound absorption performance are both poor, and its ability to resist water hammer impact is poor, resulting in cracks on the surface of the check valve after long-term work.

[0005] To achieve the above object, the present utility model provides the following technical solution: A double-sealed check valve, comprising a valve body, a right flange and a left flange are respectively provided on the right side and the left side of the valve body, and a valve seat is provided inside the valve body. A valve core is movably connected inside the valve seat, a valve rod is fixedly connected to the side of the valve core, a collar is movably connected to the outside of the valve rod, a rubber soft seal is provided inside the valve seat and located on the side of the valve core, and a valve groove is provided inside the valve seat; The double-sealed check valve adds a metal hard sealing surface between the valve seat and the valve flap on the basis of a common soft-sealed check valve. During use, the rubber soft sealing ring first contacts the valve seat to achieve the characteristics of noise elimination and the sealing performance of soft sealing. As the pressure increases, the front end of the rubber soft sealing ring is compressed, and the metal sealing surface of the valve flap contacts the valve seat. At this time, the double seals act as seals simultaneously, having both the sealing performance and noise elimination characteristics of soft sealing, and the anti-water hammer impact ability of hard sealing, ensuring zero leakage.

[0006] As a preferred technical solution of the present utility model, a connecting pipe is fixedly connected to the left side of the valve body, and the side of the connecting pipe communicates with the left flange.

[0007] As a preferred technical solution of the present utility model, connecting holes are opened on the bottom sides of both the left flange and the right flange.

[0008] As a preferred technical solution of the present utility model, a support frame is fixedly connected inside the valve body, and the support frame is fixedly connected to the collar that sleeves the valve rod inside.

[0009] As a preferred technical solution of the present utility model, a spring is sleeved on the outside of the valve rod and located inside the collar.

[0010] As a preferred technical solution of the present utility model, a sealing ring is provided between the valve seat and the inner side of the left flange on the side of the valve body.

[0011] As a preferred technical solution of the present utility model, a convex ring is fixedly connected to the side of the rubber soft seal; The rubber soft seal is combined with the metal hard seal, and the double-seal structure has both the sealing performance and noise elimination characteristics of soft sealing, and the anti-water hammer impact ability of hard sealing. At high pressures, both seals act as seals simultaneously, ensuring zero leakage.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] 1. The present utility model combines a rubber soft seal with a metal hard seal, and the double-seal structure has both the sealing performance and noise elimination characteristics of soft sealing, and the anti-water hammer impact ability of hard sealing. At high pressures, both seals act as seals simultaneously, ensuring zero leakage.

[0014] 2. The double-sealed check valve of the present utility model adds a metal hard sealing surface between the valve seat and the valve flap on the basis of a common soft-sealed check valve. During use, the rubber soft sealing ring first contacts the valve seat to achieve the noise elimination characteristic and the sealing performance of the soft seal. As the pressure increases, the front end of the rubber soft sealing ring is compressed, and the metal sealing surface of the valve flap contacts the valve seat. At this time, the double seals act simultaneously to provide both the sealing performance and noise elimination characteristic of the soft seal and the ability to resist water hammer impact of the hard seal, ensuring zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the main structural view of the present utility model;

[0016] Figure 2 is the partial main structural view of the present utility model;

[0017] Figure 3 is the valve seat view of the structure of the present utility model.

[0018] In the figure: 1. Valve body; 2. Right flange; 3. Left flange; 4. Connecting hole; 5. Valve core; 6. Spring; 7. Valve seat; 8. Sealing ring; 9. Rubber soft seal; 10. Convex ring; 11. Valve groove; 12. Valve stem; 13. Collar; 14. Support frame; 15. Connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0020] Please refer to Figures 1-3 , the present utility model provides a double-sealed check valve, which includes a valve body 1. A right flange 2 and a left flange 3 are respectively provided on the right side and the left side of the valve body 1. A valve seat 7 is provided inside the valve body 1. A valve core 5 is movably connected inside the valve seat 7. A valve stem 12 is fixedly connected to the side of the valve core 5. A collar 13 is movably connected to the outside of the valve stem 12. A rubber soft seal 9 located on the side of the valve core 5 is provided inside the valve seat 7. A valve groove 11 is provided inside the valve seat 7. The double-sealed check valve adds a metal hard sealing surface between the valve seat 7 and the valve flap on the basis of a common soft-sealed check valve. During use, the rubber soft seal 9 ring first contacts the valve seat 7 to achieve the noise elimination characteristic and the sealing performance of the soft seal. As the pressure increases, the front end of the rubber soft seal 9 ring is compressed, and the metal sealing surface of the valve flap contacts the valve seat 7. At this time, the double seals act simultaneously to provide both the sealing performance and noise elimination characteristic of the soft seal and the ability to resist water hammer impact of the hard seal, ensuring zero leakage.

[0021] In summary, through the combination of rubber soft seal 9 and metal hard seal, the double-seal structure has both the sealing performance and sound absorption characteristics of soft seal and the water hammer impact resistance of hard seal. At high pressures, both seals work simultaneously to ensure zero leakage. The double-seal check valve adds a metal hard-sealing surface between the valve seat 7 and the valve disc on the basis of a common soft-seal check valve. When in use, the rubber soft-seal 9 ring first contacts the valve seat 7 to achieve the sound absorption characteristics and the sealing performance of the soft seal. As the pressure increases, the front end of the rubber soft-seal 9 ring is compressed, and the metal sealing surface of the valve disc contacts the valve seat 7. At this time, the double seals work simultaneously, having both the sealing performance and sound absorption characteristics of soft seal and the water hammer impact resistance of hard seal, ensuring zero leakage, and solving the problems that the existing check valves have poor sealing and sound absorption performance during operation, and poor water hammer impact resistance, resulting in cracks on their surfaces after long-term operation.

[0022] A connecting pipe 15 is fixedly connected to the left side of the valve body 1. The side of the connecting pipe 15 is communicated with the left flange 3. Connecting holes 4 are provided on the bottom sides of both the left flange 3 and the right flange 2. A support frame 14 is fixedly connected to the inside of the valve body 1, and the support frame 14 is fixedly connected to a collar 13 that sleeved on the inside of the valve stem 12.

[0023] A spring 6 is sleeved on the outside of the valve stem 12 inside the collar 13. A sealing ring 8 is provided between the valve seat 7 and the left flange 3 on the side of the valve body 1. A convex ring 10 is fixedly connected to the side of the rubber soft-seal 9. The rubber soft-seal 9 combined with the metal hard-seal forms a double-seal structure, which has both the sealing performance and sound absorption characteristics of soft seal and the water hammer impact resistance of hard seal. At high pressures, both seals work simultaneously to ensure zero leakage.

[0024] During specific use, first of all, the rubber soft-seal 9 combined with the metal hard-seal forms a double-seal structure, which has both the sealing performance and sound absorption characteristics of soft seal and the water hammer impact resistance of hard seal. At high pressures, both seals work simultaneously to ensure zero leakage. The double-seal check valve adds a metal hard-sealing surface between the valve seat 7 and the valve disc on the basis of a common soft-seal check valve. When in use, the rubber soft-seal 9 ring first contacts the valve seat 7 to achieve the sound absorption characteristics and the sealing performance of the soft seal. As the pressure increases, the front end of the rubber soft-seal 9 ring is compressed, and the metal sealing surface of the valve disc contacts the valve seat 7. At this time, the double seals work simultaneously, having both the sealing performance and sound absorption characteristics of soft seal and the water hammer impact resistance of hard seal, ensuring zero leakage.

[0025] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-sealed check valve, comprising a valve body (1), characterized in that: On the right side and the left side of the valve body (1), a right flange (2) and a left flange (3) are respectively provided, and a valve seat (7) is provided inside the valve body (1). A valve core (5) is movably connected inside the valve seat (7). A valve rod (12) is fixedly connected to the side of the valve core (5). A collar (13) is movably connected to the outside of the valve rod (12). A rubber soft seal (9) located on the side of the valve core (5) is provided inside the valve seat (7). A valve groove (11) is provided inside the valve seat (7).

2. The double-sealed check valve according to claim 1, characterized in that: A connecting pipe (15) is fixedly connected to the left side of the valve body (1), and the side of the connecting pipe (15) communicates with the left flange (3).

3. A double-sealed check valve according to claim 1, characterized in that: Connection holes (4) are formed in the bottom sides of both the left flange (3) and the right flange (2).

4. A double-sealed check valve according to claim 1, characterized in that: A support frame (14) is fixedly connected inside the valve body (1), and the support frame (14) is fixedly connected to the collar (13) sleeved inside with the valve rod (12).

5. The double-sealed check valve according to claim 1, characterized in that: A spring (6) is sleeved on the outside of the valve rod (12) and located inside the collar (13).

6. A double-sealed check valve according to claim 1, characterized in that: The valve seat (7) and a sealing ring (8) inside the left flange (3) on the side of the valve body (1).

7. A double-sealed check valve according to claim 1, characterized in that: A convex ring (10) is fixedly connected to the side of the rubber soft seal (9).

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