HU87118 is a precision aerospace component compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine hydraulic control systems. It acts as a high-reliability hydraulic relief valve, a core safety component for MRO replacement. It automatically releases excess pressure when hydraulic system pressure exceeds rated value, prevents overpressure damage to pipelines, actuators and pumps, maintains stable system pressure in all flight conditions, avoids hydraulic circuit blockage or burst risks, and safeguards the integrity of engine hydraulic control systems. Made of aviation-grade corrosion-resistant alloy with precision valve core, it resists oil erosion and vibration, working stably at -55℃ to 280℃. Weighing 0.12kg, it features compact design, quick pressure relief response, leak-proof sealing and standardized ports, enabling easy installation and long-term stable operation. It is critical to guarantee hydraulic system safety and overall engine operational reliability.