856A1894G01 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, developed for the hydraulic systems of large commercial aircraft.

It serves as a hydraulic lock valve seal ring, forming a tight, pressure-stable seal between the valve's spool and valve bore. This seal ensures the valve can maintain the position of hydraulic components (such as flight control surfaces or landing gear) when the hydraulic system is not active, avoiding unintended movement that would affect aircraft parking safety or cause component misalignment before takeoff.

Made from oil-resistant, high-pressure and high-temperature resistant fluorosilicone rubber, it operates stably at -45°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.06kg, it allows fast MRO replacement, a critical component for hydraulic system safety during non-operation periods.