Gate valve with high sealing performance

Abstract

The utility model relates to the technical field of gate valves, and discloses a gate valve with high sealing performance, which solves the problem of poor sealing performance of the existing gate valve, and comprises a valve body, a combined valve cover is arranged at the top end of the valve body, a valve rod in threaded connection with the combined valve cover is arranged in the combined valve cover in a penetrating manner, and a hand wheel is fixedly arranged at the top end of the valve rod. A combined valve plate is arranged at the bottom end of the valve rod, a first sealing baffle ring and a second sealing baffle ring which are matched with the combined valve plate are arranged in the valve body, the combined valve plate is composed of a connecting plate, a valve plate body, a first ethylene propylene diene monomer gasket and a second ethylene propylene diene monomer gasket, and the connecting plate is fixedly connected to the top end of the valve plate body. The first ethylene propylene diene monomer gasket and the second ethylene propylene diene monomer gasket are fixedly connected to the two sides of the valve plate body respectively. By means of the gate valve, the overall sealing performance can be improved, and then the service life can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of gate valves, in particular to a gate valve with high sealing performance. Background Art

[0002] A gate valve is a type of valve that is widely used in various fields. The movement direction of the gate valve is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valve form a wedge shape, and the wedge angle varies with the valve parameters. The wedge-shaped design structure can improve the sealing to a certain extent, but it cannot completely solve the sealing problem. Leakage may also occur during long-term use. There are also some elastic gates on the market, but due to the different forces on both sides of the gate, the elastic gate is easily affected by the pressure difference change, resulting in a certain degree of displacement, which also affects the sealing. Therefore, the present application proposes a gate valve with high sealing performance. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a gate valve with high sealing performance, which effectively solves the problem of poor sealing performance of the existing gate valve.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a highly sealing gate valve, comprising a valve body, a combined valve cover is arranged at the top of the valve body, a valve stem threadedly connected to the combined valve cover is inserted inside the combined valve cover, a hand wheel is fixedly arranged at the top of the valve stem, a combined valve plate is arranged at the bottom of the valve stem, a sealing baffle ring 1 and a sealing baffle ring 2 matching the combined valve plate are arranged inside the valve body, the combined valve plate is composed of a connecting plate, a valve plate body, an EPDM rubber gasket 1 and an EPDM rubber gasket 2, the connecting plate is fixedly connected to the top of the valve plate body, and the EPDM rubber gasket 1 and the EPDM rubber gasket 2 are respectively fixedly connected to the two sides of the valve plate body.

[0005] Preferably, flange plates are fixedly provided at both ends of the valve body, the flange plate, sealing baffle ring 1 and sealing baffle ring 2 are all integrated with the valve body, and sealing baffle ring 1 and sealing baffle ring 2 are both inclined structures.

[0006] Preferably, a receiving plate is fixedly provided on the bottom ends of the sealing baffle ring 1 and the sealing baffle ring 2 close to the combined valve plate.

[0007] Preferably, a limiting column located between the first sealing retaining ring and the second sealing retaining ring is fixedly provided at the middle position of the bottom end of the valve body, the top end of the limiting column is a chamfered structure, and the limiting column and the valve body are an integrated structure.

[0008] Preferably, a limiting groove matching the limiting column is provided at the middle position of the bottom end of the valve plate body.

[0009] Preferably, a universal ball 1 and a universal ball 2 are provided on one side of the connecting plate, and the universal ball 1 and the universal ball 2 are in contact with the inner wall of the valve body.

[0010] Preferably, a connecting seat rotatably connected to the valve stem is provided in the middle position of the top end of the connecting plate, an annular groove is provided on the side of the top end of the connecting plate, and an O-ring is provided inside the annular groove.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) During operation, a combined valve plate consisting of a sealing baffle ring 1, a sealing baffle ring 2, and a connecting plate, a valve plate body, an EPDM rubber gasket 1, and an EPDM rubber gasket 2 can be provided to form a wedge-shaped structure and realize elastic sealing, thereby improving sealing performance and avoiding leakage;

[0013] (2) By setting a limit column and a limit slot, the combined valve plate can be limited when the combined valve plate is closed, so as to avoid the different deformation degrees of EPDM rubber gasket 1 and EPDM rubber gasket 2 due to pressure difference, which may affect the sealing performance; by setting universal ball 1 and universal ball 2, the combined valve plate can be supported laterally, and the force on the valve stem can be reduced during the opening and closing process of the combined valve plate, so as to avoid the deformation of the valve stem and affect the service life; by setting an annular groove and an O-ring, the top of the valve body can be sealed when the combined valve plate is fully opened, so as to avoid the fluid from impacting the connection between the valve stem and the valve body, thereby improving the sealing performance of the connection between the valve stem, the valve body and the valve cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] In the attached picture:

[0016] Figure 1 This is a schematic diagram of the structure of a high-sealing gate valve of the utility model;

[0017] Figure 2 This is one of the cross-sectional views of the high-sealing gate valve of the utility model;

[0018] Figure 3 For this utility model Figure 2 A partial enlarged view of

[0019] Figure 4 This is the second cross-sectional view of the high-sealing gate valve of the utility model;

[0020] Figure 5 For this utility model Figure 5 A partial enlarged view of

[0021] Figure 6 This is a schematic diagram of the structure of the combined valve plate of the utility model;

[0022] In the figure: 1. valve body; 2. combined valve cover; 3. valve stem; 4. hand wheel; 5. combined valve plate; 6. sealing retaining ring 1; 7. sealing retaining ring 2; 8. connecting plate; 9. valve plate body; 10. EPDM rubber gasket 1; 11. EPDM rubber gasket 2; 12. flange plate; 13. receiving plate; 14. limiting column; 15. limiting slot; 16. universal ball 1; 17. universal ball 2; 18. connecting seat; 19. annular groove; 20. O-ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] Depend on Figures 1 to 6 The utility model provides a gate valve with high sealing performance, including a valve body 1, a combined valve cover 2 is arranged at the top of the valve body 1, a valve stem 3 threadedly connected to the combined valve cover 2 is inserted inside the combined valve cover 2, a hand wheel 4 is fixedly arranged at the top of the valve stem 3, a combined valve plate 5 is arranged at the bottom of the valve stem 3, a sealing retaining ring 1 6 and a sealing retaining ring 2 7 matching the combined valve plate 5 are arranged inside the valve body 1, the combined valve plate 5 is composed of a connecting plate 8, a valve plate body 9, an EPDM rubber gasket 1 10 and an EPDM rubber gasket 2 11, the connecting plate 8 is fixedly connected to the top of the valve plate body 9, and the EPDM rubber gasket 10 and the EPDM rubber gasket 2 11 are fixedly connected to both sides of the valve plate body 9 respectively;

[0025] A wedge-shaped installation structure can be formed by the sealing retaining ring 1 6 and the sealing retaining ring 2 7 and the combined valve plate 5 composed of the connecting plate 8, the valve plate body 9, the EPDM rubber gasket 1 10 and the EPDM rubber gasket 2 11. The wedge-shaped structure can improve the sealing performance. The EPDM rubber gasket 1 10 and the EPDM rubber gasket 2 11 can achieve elastic sealing, thereby further improving the sealing performance of the connection.

[0026] Depend on Figures 1 to 6It is given that flange plates 12 are fixedly provided at both ends of the valve body 1, and the flange plate 12, the sealing retaining ring 1 6 and the sealing retaining ring 2 7 are all integrated structures with the valve body 1, the sealing retaining ring 1 6 and the sealing retaining ring 2 7 are both inclined structures, and the bottom ends of the sealing retaining ring 1 6 and the sealing retaining ring 2 7 close to the combined valve plate 5 are fixedly provided with a receiving plate 13, and a limiting column 14 located between the sealing retaining ring 1 6 and the sealing retaining ring 2 7 is fixedly provided in the middle position of the bottom end of the valve body 1, and the top of the limiting column 14 is a chamfered structure, and the limiting The position post 14 and the valve body 1 are of an integrated structure, a limit slot 15 matching the limit post 14 is provided at the middle position of the bottom end of the valve plate body 9, a universal ball 16 and a universal ball 2 17 are provided on one side of the connecting plate 8, the universal ball 16 and the universal ball 2 17 are fitted with the inner wall of the valve body 1, a connecting seat 18 rotatably connected to the valve stem 3 is provided at the middle position of the top end of the connecting plate 8, an annular groove 19 is provided on the side of the top end of the connecting plate 8, and an O-type sealing ring 20 is provided inside the annular groove 19;

[0027] By arranging the flange plate 12, the sealing retaining ring 1 6 and the sealing retaining ring 2 7 as an integral structure with the valve body 1, the overall strength can be improved. The limiting column 14 and the limiting groove 15 can limit the combined valve plate 5 when it is closed, so that the EPDM rubber gasket 1 10 and the EPDM rubber gasket 2 11 have the same degree of deformation, thereby preventing the combined valve plate 5 from being offset and affecting the sealing performance. The universal ball 1 16 and the universal ball 2 17 can be used to auxiliary limit the combined valve plate 5, reduce the force on the valve stem 3 during the opening and closing process of the combined valve plate 5, and avoid deformation of the valve stem 3. The O-ring 20 can achieve auxiliary sealing when the combined valve plate 5 is fully opened to prevent the fluid from impacting the connection between the valve stem 3 and the valve body 1 and the combined valve cover 2.

[0028] During operation, by providing a sealing baffle ring 1, a sealing baffle ring 2 and a combined valve plate composed of a connecting plate, a valve plate body, an EPDM rubber gasket 1 and an EPDM rubber gasket 2, a wedge-shaped structure can be formed and an elastic seal can be achieved, thereby improving the sealing performance and avoiding leakage; by providing a limit column and a limit slot, the combined valve plate can be limited when the combined valve plate is closed, thereby avoiding the different deformation degrees of the EPDM rubber gasket 1 and the EPDM rubber gasket 2 due to the pressure difference and affecting the sealing performance; by providing a universal ball 1 and a universal ball 2, the combined valve plate can be supported laterally, and the force on the valve stem can be reduced during the opening and closing process of the combined valve plate, thereby avoiding deformation of the valve stem and affecting the service life; by providing an annular groove and an O-ring, the top of the valve body can be sealed when the combined valve plate is fully opened, thereby avoiding the fluid from impacting the connection between the valve stem and the valve body, thereby improving the sealing performance of the connection between the valve stem and the valve body and the valve cover.

Claims

1. A gate valve with high sealing performance, comprising a valve body (1), characterized in that: The top of the valve body (1) is provided with a combined valve cover (2), the interior of the combined valve cover (2) is interspersed with a valve stem (3) threadedly connected thereto, the top of the valve stem (3) is fixedly provided with a hand wheel (4), the bottom of the valve stem (3) is provided with a combined valve plate (5), the interior of the valve body (1) is provided with a sealing retaining ring 1 (6) and a sealing retaining ring 2 (7) matching the combined valve plate (5), the combined valve plate (5) is composed of a connecting plate (8), a valve plate body (9), an EPDM rubber gasket 1 (10) and an EPDM rubber gasket 2 (11), the connecting plate (8) is fixedly connected to the top of the valve plate body (9), and the EPDM rubber gasket 1 (10) and the EPDM rubber gasket 2 (11) are respectively fixedly connected to the two sides of the valve plate body (9).

2. A high-sealing gate valve according to claim 1, characterized in that: Both ends of the valve body (1) are fixedly provided with flange plates (12); the flange plate (12), the first sealing retaining ring (6) and the second sealing retaining ring (7) are all integral structures with the valve body (1); and the first sealing retaining ring (6) and the second sealing retaining ring (7) are both inclined structures.

3. A high-sealing gate valve according to claim 1, characterized in that: A receiving plate (13) is fixedly provided at the bottom end of the sealing baffle ring 1 (6) and the sealing baffle ring 2 (7) on the side close to the combined valve plate (5).

4. A high-sealing gate valve according to claim 1, characterized in that: A limiting column (14) is fixedly provided at the middle position of the bottom end of the valve body (1) and is located between the sealing retaining ring 1 (6) and the sealing retaining ring 2 (7); the top end of the limiting column (14) is a chamfered structure; the limiting column (14) and the valve body (1) are an integrated structure.

5. A high-sealing gate valve according to claim 4, characterized in that: A limiting groove (15) matching the limiting column (14) is provided at the middle position of the bottom end of the valve plate body (9).

6. A high-sealing gate valve according to claim 1, characterized in that: Universal ball one (16) and universal ball two (17) are arranged on one side of the connecting plate (8), and the universal ball one (16) and the universal ball two (17) are in contact with the inner wall of the valve body (1).

7. A high-sealing gate valve according to claim 1, characterized in that: A connecting seat (18) rotatably connected to the valve stem (3) is arranged in the middle of the top of the connecting plate (8), an annular groove (19) is arranged on the side of the top of the connecting plate (8), and an O-type sealing ring (20) is arranged inside the annular groove (19).

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