Pneumatic diaphragm cryogenic control valves are suitable for low-temperature and cryogenic applications with medium temperatures ranging from -40°C to -196°C (e.g., liquid oxygen, liquid nitrogen). Primarily composed of a multi-spring pneumatic diaphragm actuator and a valve body with a long-neck connection, the long-neck upper bonnet design keeps the packing operating at ambient temperature while minimizing external heat transfer. To further reduce heat transfer, the long neck typically features a thin-wall structure with excellent low-temperature resistance, making it particularly suitable for * accurate control of cryogenic gases and fluids (e.g., liquid oxygen, liquid argon) to maintain process parameters at specified values.