Product range
The cryogenic ball valve has two types: floating ball and trunnion mounted ball. For their range, face to face dimension and flange dimension, please refer to the corresponding data of common floating ball valve and trunnion mounted ball valve. For valves with working temperature above -50℃. long neck design is seldom adopted. For valves with working temperature below -50℃. the neck length T shall be 250mm, or shall be decided as per our own design and calculation.

Structure features of cryogenic ball valve
Cryogenic ball valve is used for low temperature working condition, especially for some hazard media, such as liquidized natural gas. Our company has been experienced in the design, manufacturing, inspection and test of cryogenic ball valve.

Choose for material
Common steels are brittle in the cryogenic condition. So, the key point for the design and production of cryogenic ball is to select proper body material according to the minimum working temperature of the ball valve. To ensure the material suitability under the low temperature condition, the material adopted shall be impact tested according to the standard requirement.The packing, gasket, bolt and nut shall also adopt the materials suitable for low temperature condition.

Minimum working temperature for body material

Design and manufacturing features
Being required by the standard, the long neck design is usually adopted for the ball valve below -50℃. The long neck design can keep the heat at the packing position and ensure the reliable sealing performance of the valve packing. The length of the neck complies to the standard, but, can be also changed as per the customer's request in the contract.
For cryogenic ball valve, if the valve is at closed position, the cryogenic liquid stayed in the cavity of the valve will be gasified and expanded when the temperature gets rising. This will cause the unusual high pressure in the cavity, and maybe break the valve. To avoid such dangerous accident, our ball valve has self-relief function for the cavity pressure. When the pressure in the cavity unusually rises, the medium in the cavity will push the seat to relive the pressure by it's own force.Such design will endure the safety of the valve.
The ball valve can be cryogenic tested if it is specified in the contract. The operating torque, sealing performance and other data can be obtained and checked by the test.
The spare parts of the valve shall be cryogenically treated to ensure their dimensional stability under the cryogenic condition.