The HAWE CRV-21A Relief Valve is a ventable, pilot-operated balanced piston hydraulic cartridge relief valve engineered to provide precise pressure control, remote venting capability, and dependable overpressure protection in compact hydraulic systems. Designed for demanding mobile and industrial fluid power applications, the CRV-21A series features a balanced piston main stage with an external drain and integral 8A control cavity, delivering stable and efficient pressure regulation in hydraulic circuits requiring advanced pilot-operated relief functionality. 

Featuring a compact T-21A cavity design, operating pressures up to 350 bar (5,076 psi), and flow capacities up to 60 L/min, these hydraulic relief valves are ideal for hydraulic manifolds, mobile equipment, industrial machinery, custom hydraulic power units, and cross-port relief circuits requiring pilot-operated unloading and remote venting control. The HAWE CRV-21A series is available with multiple minimum control pressure spring options for both low-pressure and higher pressure-drop applications and is compatible with T-8A cavity pilot controls including CRPA-8A-2D and CPRB-8A-2D configurations. Designed with fast typical response times of approximately 10 ms, low leakage characteristics, and balanced piston construction for stable operation, the CRV-21A valve series helps improve hydraulic efficiency, pressure stability, and overall system reliability in demanding operating environments. 

Warning: Improper valve selection, pressure adjustment, installation, or hydraulic system integration may result in uncontrolled pressure conditions, hydraulic system failure, equipment damage, serious injury, or death. When used in cross-port relief applications, double back-up rings are required, and spool leakage should be considered during system design. Always verify system compatibility, follow manufacturer installation torque specifications, ensure proper vent, drain, and pressure settings, and adhere to all hydraulic safety procedures before operation.