JXHK-GB-1773 is a precision-manufactured aerospace aircraft cabin environmental control system (ECS) pressure relief valve seal, compliant with GJB (Chinese Military Standard) and CAAC (Civil Aviation Administration of China) regulations, designed for domestic large commercial aircraft. It seals the mating surface between the ECS pressure relief valve and its mounting base, preventing uncontrolled cabin air leakage, which is critical for maintaining stable cabin pressure and air oxygen concentration during flight, ensuring the comfort and safety of passengers and crew.

Made from oil-resistant, temperature-resistant ethylene propylene diene monomer (EPDM) rubber with a reinforced aluminum core, it withstands operating temperatures from -55°C to 130°C and cabin pressure differences up to 8.6 psi. Weighing 0.08kg with a precision-machined sealing surface, it allows for fast replacement and tightness verification during ECS MRO overhauls. It is a key component for cabin ECS reliability.