Low-torque bidirectional sealing metal sealing floating ball valve

Abstract

The utility model relates to a low-torque two-way sealing metal sealing floating ball valve which comprises a valve body, a ball body and a connecting body, and a first step groove, a second step groove and a third step groove are sequentially formed in the inner wall of the connecting body from bottom to top. The second step groove and the first step groove are connected with a first sealing assembly in a pressing mode through a first valve seat, the valve body is connected with a second sealing assembly in a pressing mode through a second valve seat, and a winding gasket is fixedly connected between the valve body and the connecting body in a pressing mode. The low-torque bidirectional sealing metal sealing floating ball valve has the advantages of improving the sealing performance, improving the wear resistance, reducing the torque and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of metal-sealed floating ball valves, in particular to a low-torque bidirectionally sealed metal-sealed floating ball valve. Background Art

[0002] The ball of the floating ball valve is floating. Under the pressure of the medium, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet to ensure the sealing of the outlet. The ball and the valve seat are the most important sealing parts in the valve. The sealing cooperation between the two affects the sealing performance of the entire valve. The seal here is a dynamic seal, which is prone to leakage and accompanied by various wear. In addition, the working medium environment also affects the working conditions of the valve seat and the ball. The floating ball valve structure prevents the valve from getting stuck during rotation at high temperatures.

[0003] To this end, we have developed a low-torque, bidirectionally sealed metal-sealed floating ball valve to solve the above problems. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a low-torque bidirectional sealed metal-sealed floating ball valve, which has the advantages of improved sealing performance, improved wear resistance, reduced torque and the like.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a low-torque bidirectional sealed metal-sealed floating ball valve, comprising a valve body, a ball and a connecting body, the inner wall of the connecting body is provided with a first step groove, a second step groove and a third step groove from bottom to top, the second step groove and the first step groove are crimped with a first sealing component through a first valve seat, the valve body is crimped with a second sealing component through a second valve seat, and a winding gasket is fixedly crimped between the valve body and the connecting body.

[0006] Preferably, the first sealing assembly includes a wedge-shaped graphite packing, a packing pressure ring and a disc spring which are crimped in sequence, one end of the wedge-shaped graphite packing is crimped to the second step groove, and the bottom end of the disc spring is crimped to the first valve seat.

[0007] Preferably, a conical surface is provided at one end of the second step groove, a wedge-shaped end is provided at one end of the wedge-shaped graphite filler, and the conical surface is crimped to the wedge-shaped end.

[0008] Preferably, a plane is provided at the other end of the wedge-shaped graphite filler, and the plane is crimped to the filler pressing ring.

[0009] Preferably, the disc spring is provided with a large end and a small end, the first valve seat is provided with a first L-shaped groove, the first L-shaped groove is crimped with the small end, and the large end is crimped with the packing pressure ring.

[0010] Preferably, a first wear-resistant layer is provided at a corner of the inner wall of the first valve seat, and the first wear-resistant layer is press-connected with the ball.

[0011] Preferably, a stepped groove is provided at one end of the connecting body, and a first connecting hole is provided at the other end, the first connecting hole is fixedly connected to the water inlet pipe, and the valve body is provided with a second connecting hole, and the second connecting hole is fixedly connected to the water outlet pipe.

[0012] Preferably, a second L-shaped groove is provided at one end of the valve body, and the winding gasket is crimped between the stepped groove and the second L-shaped groove.

[0013] Preferably, a second wear-resistant layer is provided on the inner wall of one end of the second valve seat, and the second wear-resistant layer is press-connected with the ball.

[0014] Preferably, the second sealing assembly has the same structure and size as the first sealing assembly.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The low-torque bidirectional sealed metal-sealed floating ball valve of the utility model adopts a wedge-shaped graphite packing structure to achieve reliable sealing and realize a bidirectional sealing valve seat structure with low torque; a wear-resistant layer is arranged on the valve seat to improve wear resistance and extend the life of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the low-torque bidirectional sealed metal-sealed floating ball valve of the utility model.

[0018] Figure 2 For this utility model Figure 1 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 and Figure 2 In the invention, a low torque bidirectional sealed metal sealing floating ball valve comprises a valve body 1, a ball body 6 and a connector 2. The inner wall of the connector 2 is provided with a first step groove 21, a second step groove 22 and a third step groove 23 from bottom to top. The second step groove 22 and the first step groove 21 are pressed with a first sealing component 19 through a first valve seat 7. The valve body 1 is pressed with a second sealing component 13 through a second valve seat 70. A wound gasket 5 is fixedly pressed between the valve body 1 and the connector 2. In order to facilitate processing and assembly, the second sealing component 13 has the same structural dimensions as the first sealing component 19.

[0021] A second L-shaped groove 11 is provided at one end of the valve body 1, and a wound gasket 5 is crimped between the stepped groove 25 and the second L-shaped groove 11. The valve body 1 and the connecting body 2 are fixedly connected by bolts 24. A stepped groove 25 is provided at one end of the connecting body 2, and a first connecting hole 20 is provided at the other end, and the first connecting hole 20 is fixedly connected to the water inlet pipe. A second connecting hole 12 is provided at one end of the valve body 1, and the second connecting hole 12 is fixedly connected to the water outlet pipe.

[0022] The first sealing assembly 19 includes a wedge-shaped graphite packing 10, a packing pressing ring 9 and a disc spring 8 which are crimped in sequence. One end of the wedge-shaped graphite packing 10 is crimped with the second step groove 22. A plane 102 is provided at the other end of the wedge-shaped graphite packing 10. The bottom end of the disc spring 8 is crimped with the first valve seat 7. A conical surface 221 is provided at one end of the second step groove 22. A wedge-shaped end 101 is provided at one end of the wedge-shaped graphite packing 10. The conical surface 221 is crimped with the wedge-shaped end 101. The plane 102 is crimped with the packing pressing ring 9.

[0023] The disc spring 8 is provided with a large end 81 and a small end 82. The inner wall of the first valve seat 7 is provided with a first L-shaped groove 71. The disc spring 8 is clamped between the first L-shaped groove 71 and the first step groove 21. The first L-shaped groove 71 is pressed against the small end 82, and the large end 81 is pressed against the packing ring 9. The large end 81 presses the packing ring 9 and the wedge-shaped end 101 to the conical surface 221, thereby improving the sealing performance and reducing the torque.

[0024] A first wear-resistant layer 72 is provided at one corner of the inner wall of the first valve seat 7, and the first wear-resistant layer 72 is pressed against the ball 6. A second wear-resistant layer 701 is provided at the inner wall of one end of the second valve seat 70, and the second wear-resistant layer 701 is pressed against the ball 6 to improve wear resistance and extend the life of the valve seat.

[0025] A wedge-shaped graphite packing 10 is installed above the valve body and the connector, and a disc spring is used to provide a compression force to compress the packing ring. The valve seat is designed to be a structure where the disc spring provides a preload. The disc spring force acts on the packing ring to compress the wedge-shaped graphite packing, and at the same time provides a preload for the valve seat and the ball seal. The middle cavity medium enters the valve from the upstream, and under the medium pressure and the preload provided by the disc spring, the valve is sealed downstream through the downstream valve seat. Similarly, the middle cavity medium enters the valve from the downstream, and under the medium pressure and the preload provided by the disc spring, the valve seat on the other side can also be sealed. The wedge-shaped graphite plays a major sealing role, and the wedge-shaped surface design of the wedge-shaped end 101 of the graphite packing is used to enhance the sealing reliability and reduce the torque. This design has high sealing reliability, high stability, and can effectively reduce torque.

[0026] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model.

Claims

1. A low torque bidirectional sealing metal sealing floating ball valve, characterized by: The invention comprises a valve body (1), a ball (6) and a connector (2); the inner wall of the connector (2) is provided with a first step groove (21), a second step groove (22) and a third step groove (23) in sequence from bottom to top; the second step groove (22) and the first step groove (21) are crimped with a first sealing component (19) via a first valve seat (7); the valve body (1) is crimped with a second sealing component (13) via a second valve seat (70); and a winding pad (5) is fixedly crimped between the valve body (1) and the connector (2).

2. According to claim 1, the low torque bidirectional sealing metal sealing floating ball valve is characterized in that: The first sealing assembly (19) comprises a wedge-shaped graphite filler (10), a filler pressure ring (9) and a disc spring (8) which are crimped in sequence, one end of the wedge-shaped graphite filler (10) is crimped to the second step groove (22), and the bottom end of the disc spring (8) is crimped to the first valve seat (7).

3. The low torque bidirectional sealing metal sealing floating ball valve according to claim 2 is characterized in that: A conical surface (221) is provided at one end of the second step groove (22), a wedge-shaped end (101) is provided at one end of the wedge-shaped graphite filler (10), and the conical surface (221) is pressed against the wedge-shaped end (101).

4. The low torque bidirectional sealing metal sealing floating ball valve according to claim 3 is characterized in that: A plane (102) is provided at the other end of the wedge-shaped graphite filler (10), and the plane (102) is press-connected with the filler pressure ring (9).

5. The low torque bidirectional sealing metal sealing floating ball valve according to claim 2, characterized in that: The disc spring (8) is provided with a large end (81) and a small end (82), the first valve seat (7) is provided with a first L-shaped groove (71), the first L-shaped groove (71) is crimped with the small end (82), and the large end (81) is crimped with the packing pressure ring (9).

6. The low torque bidirectional sealing metal sealing floating ball valve according to claim 2, characterized in that: A first wear-resistant layer (72) is provided at a corner of the inner wall of the first valve seat (7), and the first wear-resistant layer (72) is pressed against the ball (6).

7. The low torque bidirectional sealing metal sealing floating ball valve according to claim 2, characterized in that: The connecting body (2) is provided with a stepped groove (25) at one end and a first connecting hole (20) at the other end, the first connecting hole (20) being fixedly connected to the water inlet pipe, and the valve body (1) is provided with a second connecting hole (12), the second connecting hole (12) being fixedly connected to the water outlet pipe.

8. The low torque bidirectional sealing metal sealing floating ball valve according to claim 7, characterized in that: A second L-shaped groove (11) is provided at one end of the valve body (1), and the winding pad (5) is crimped between the stepped groove (25) and the second L-shaped groove (11).

9. The low torque bidirectional sealing metal sealing floating ball valve according to claim 1, characterized in that: A second wear-resistant layer (701) is provided on the inner wall of one end of the second valve seat (70), and the second wear-resistant layer (701) is press-fitted to the ball (6).

10. The low torque bidirectional sealing metal sealing floating ball valve according to claim 2, characterized in that: The second sealing component (13) has the same structure and size as the first sealing component (19).

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