Cryogenic Butterfly Valves

The cryogenic butterfly valve is a specialized control valve designed for ultra-low temperature operating conditions (typically operating at temperatures ≤ -46°C, suitable for media such as LNG, liquid oxygen, liquid nitrogen, and liquid argon). Its core technology lies in achieving zero-leakage sealing, low-torque operation, and long-term structural integrity in extreme cold environments through deep-cryogenic structural design, material selection, and specialized sealing solutions, effectively avoiding risks such as material embrittlement, low-temperature deformation, or seal failure. Key design features of cryogenic butterfly valves include: Extended neck bonnet design to isolate the packing chamber, bearings, and actuator from the cryogenic flow path, effectively blocking cold transfer and preventing external frost formation and operational freezing. Pressure-retaining components made of austenitic stainless steel (e.g., 304, 316L) or cryogenic nickel steel, subjected to deep-cryogenic treatment to stabilize the microstructure. Sealing systems typically employ multi-layer stainless steel with flexible graphite composite metal hard seals or specially modified PTFE soft seals to accommodate thermal contraction and maintain elasticity at low temperatures. The cryogenic butterfly valves produced by Kaiweixi Valve Group often adopt double-eccentric or triple-eccentric designs, allowing the sealing surfaces to disengage during operation, significantly reducing wear and operational torque. These valves are widely used in applications such as:LNG receiving terminals and storage facilities、Air separation units、Cryogenic storage and transportation systems、Aerospace fuel supply systems、Specialized chemical processing industries