Cryogenic Ball Valves are designed for low-temperature service below -29℃ and are generally categorized into three temperature ranges: -29℃ to -46℃ (or -50℃); -46℃ (or -50℃) to -101℃ (or -110℃); -101℃ (or -110℃) to -196℃. Applications below -196℃ are extremely rare and typically involve media such as liquid hydrogen or liquid helium. For service at -196℃ and above, the valves are designed and manufactured in accordance with BS 6364, ISO 28921-1, MSS SP-134, SPE 77-200, GB/T 24925, and other applicable standards. Pressure ratings include CL150, CL300, CL600, CL900, CL1500, and CL2500 (or PN16 to PN420). Bonnet extension height is designed to comply with the requirements of SPE 77-200, and customized designs can be provided if customers have specific height requirements.
Size:
NPS1/2~~NPS20 (DN15~~DN500), sizes beyond this range can be customized according to customer requirements.
Material:
Body material is selected according to customer orders. For temperatures between -29℃ and -46℃ (or -50℃), LCB or LF2 is generally used. For temperatures below -46℃ (or -50℃), austenitic stainless steels are typically used, such as CF8 (F304), CF3 (F304L), CF8M (F316), CF3M (F316L), etc.
Internal parts/Stem:
For temperatures between -29℃ and -46℃ (or -50℃), sealing rings may be made of soft sealing materials such as silicone rubber (VMQ), fluororubber (FKM), or PTFE. For temperatures below -46℃ (or -50℃), PCTFE is used for soft sealing rings. Multilayer sealing rings are composed of stainless steel wire and flexible graphite composite rings, or hard-faced sealing surfaces made by surfacing, thermal spraying, or coating processes on both the seat and the disc (using corrosion-resistant base materials). The stem is integrally forged or configured according to customer requirements.
Structure:
The valve body follows standard valve designs. The extended bonnet is designed according to the standards described in the introduction, either as an integral extended bonnet (without welding), or by adding a pipe section in the middle of the bonnet and welding it using full-penetration butt welding. Gas-shielded welding is not allowed (as it cannot ensure impact resistance of the finished product). Welds must undergo non-destructive testing to verify quality. Gate valves can be provided with pressure relief holes and corresponding markings as required by the customer.
Operation mode:
Manual, worm gear, electric, pneumatic, etc.
