Low temperature bidirectional seal valve seat and ball valve

Abstract

The utility model discloses a low temperature bidirectional sealing valve seat and ball valve, it includes valve seat main part and the sealing assembly of setting on valve seat main part, the outer periphery of valve seat main part is provided with annular embedding groove, the sealing assembly includes the seal ring seat of detachable setting in embedding groove and the lip type seal ring of setting in the both sides of seal ring seat, the utility model bidirectional sealing structure uses two single ring spring seal ring combination, and two lip type seal rings bear one direction medium pressure respectively, and the split type metal split ring and the baffle ring can support in any direction, and there is no lip type seal ring bearing reverse pressure condition, so it will not be damaged, and the elasticity is big, and easy installation changes, ensure that the low temperature bidirectional sealing valve seat of this new type can provide reliable bidirectional sealing property when being convenient for installation, also reduced manufacturing and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic valves, specifically to a cryogenic bidirectional sealing valve seat and ball valve. Background Technology

[0002] The surge in demand for liquefied natural gas (LNG) as a clean transitional energy source has driven the market expansion of cryogenic valves, with particularly noticeable growth in demand for cryogenic ball valves. Developing high-pressure ball valves and sealing seats that maintain stable sealing performance even in extreme environments of -196°C is a major trend in the valve industry today.

[0003] Traditional bidirectional cryogenic valve seats use lip seals with a double-strand spring and a metal ring reinforcement, totaling four springs. This results in low elasticity, high procurement costs, inconvenience during installation (often requiring tooling), and easy scratching of the valve seat sealing surface. Conventional lip seals can only withstand medium pressure in one direction; reverse medium pressure will damage the lip seal. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of this utility model is to provide a low-temperature bidirectional sealing valve seat and ball valve.

[0005] To achieve the above objectives, the technical solution of this utility model is: a low-temperature bidirectional sealing valve seat, which includes a valve seat body and a sealing assembly sleeved on the valve seat body. The outer periphery of the valve seat body is provided with an annular embedding groove. The sealing assembly includes a sealing ring seat detachably disposed in the embedding groove and lip sealing rings disposed on both sides of the sealing ring seat.

[0006] Preferably, the sealing ring seat includes two split rings (3) and a retaining ring sleeved on the split rings (3). The split rings (3) include a semi-circular outer ring body for setting the lip seal and an inwardly extending insert for setting in the insert groove. The retaining ring is sleeved on the opposite side of the two split rings (3) where the lip seal is set to prevent the two split rings (3) from separating from each other.

[0007] More preferably, a lip seal is provided on the side of the retaining ring away from the split ring (3).

[0008] More preferably, the lip seal includes a hollow seal ring and an annular spring disposed therein.

[0009] Preferably, the embedding groove has an arc-shaped inlet groove on at least one side.

[0010] Preferably, a valve seat insert ring is provided on the valve seat body.

[0011] A ball valve having the aforementioned cryogenic bidirectional sealing seat.

[0012] The advantages of this utility model are:

[0013] This utility model's bidirectional sealing structure uses a combination of two single-loop spring sealing rings. Each of the two lip sealing rings bears the medium pressure in one direction. The separate metal split rings and retaining rings can provide support in any direction. There is no reverse pressure on the lip sealing rings, so they will not be damaged. They are also highly elastic, easy to install and replace, ensuring that this new type of low-temperature bidirectional sealing valve seat can provide reliable bidirectional sealing while being easy to install, and also reducing manufacturing and maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the valve seat cross-section of this utility model;

[0017] Figure 2 This is an exploded view of the valve seat of this utility model;

[0018] Figure 3 A ball valve having the valve seat of this utility model.

[0019] The components include: 1. Valve seat body; 2. Valve seat insert ring; 3. Split ring; 4. Lip seal ring; 5. Retaining ring. Detailed Implementation

[0020] See appendix Figures 1-2 As shown, a low-temperature bidirectional sealing valve seat includes a valve seat body 1 and a sealing assembly sleeved on the valve seat body 1. The valve seat body 1 is provided with a valve seat embedding ring 2, and an annular embedding groove is provided on the outer periphery of the valve seat body 1. The sealing assembly includes a sealing ring seat detachably disposed in the embedding groove and lip sealing rings 4 disposed on both sides of the sealing ring seat.

[0021] After the sealing assembly is installed on the valve seat body 1 through the embedded groove, the sealing assembly can withstand pressure in two directions and ensure sealing in both directions.

[0022] The sealing ring seat includes two split rings 3 and a retaining ring 5 sleeved on the split rings 3. The split rings 3 include a semi-circular outer ring body for setting the lip seal 4 and an inwardly extending insert for setting in the insert groove. The retaining ring 5 is sleeved on the opposite side of the two split rings 3 where the lip seal 4 is set to prevent the two split rings 3 from separating from each other.

[0023] The split structure of the open ring 3 and the retaining ring 5 ensures that the single-strand spring lip seal 4 is not easily deformed by pressure and has reliable sealing performance.

[0024] A lip seal 4 is provided on the side of the retaining ring 5 away from the split ring 3. The lip seal 4 includes a hollow sealing ring and an annular spring disposed therein. The single-strand spring lip seal 4 is easier to disassemble and replace, and makes it easier to maintain the valve and replace the seal.

[0025] The insert has an arc-shaped guide groove on at least one side, which can further facilitate maintenance and replacement.

[0026] See appendix Figure 3 As shown, a ball valve has a cryogenic bidirectional sealing valve seat according to this embodiment. Specifically, it includes a valve body 6, a ball 7, a valve stem 8, and the cryogenic bidirectional sealing valve seat according to this embodiment.

Claims

1. A cryogenic bidirectional sealing valve seat, comprising a valve seat body (1) and a sealing assembly sleeved on the valve seat body (1), characterized in that: The valve seat body (1) has an annular embedding groove on its outer periphery, and the sealing assembly includes a sealing ring seat that is detachably disposed in the embedding groove and a lip sealing ring (4) disposed on both sides of the sealing ring seat.

2. The cryogenic bidirectional sealing valve seat according to claim 1, characterized in that: The sealing ring seat includes two split rings (3) and a retaining ring (5) sleeved on the split rings (3). The split rings (3) include a semi-circular outer ring body for setting the lip seal (4) and an inwardly extending insert for setting in the insert groove. The retaining ring (5) is sleeved on the opposite side of the two split rings (3) where the lip seal (4) is set to prevent the two split rings (3) from separating from each other.

3. A cryogenic bidirectional sealing valve seat according to claim 2, characterized in that: A lip seal (4) is provided on the side of the retaining ring (5) away from the split ring (3).

4. A cryogenic bidirectional sealing valve seat according to claim 2 or 3, characterized in that: The lip seal (4) includes a hollow seal ring and an annular spring disposed therein.

5. A cryogenic bidirectional sealing valve seat according to claim 1, characterized in that: The embedding groove has an arc-shaped inlet groove on at least one side.

6. A cryogenic bidirectional sealing valve seat according to claim 1, characterized in that: A valve seat insert ring (2) is provided on the valve seat body (1).

7. A ball valve, characterized in that: It has a cryogenic bidirectional sealing valve seat as described in any one of claims 1-6.

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