856A2714G04 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, developed for the hydraulic systems of large commercial aircraft.

It acts as a hydraulic pressure relief valve seal ring, forming a tight, pressure-stable seal between the valve's poppet and valve seat. This seal ensures the valve can accurately regulate the pressure of the hydraulic system, releasing excess pressure when the system pressure exceeds the safe threshold, preventing overpressure that would damage hydraulic components, cause hydraulic line bursts, or lead to failure of critical systems like flight control or landing gear during flight.

Made from oil-resistant, high-pressure and high-temperature resistant fluorosilicone rubber, it performs stably at -45°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.07kg, it enables fast MRO replacement, a critical safety component for hydraulic system pressure control.