Proportional pressure relief valves are hydraulic components that continuously regulate system pressure by modulating flow in proportion to an electrical control signal. This category includes direct-operated and pilot-assisted proportional relief valves such as Parker Hannifin RE series valves (e.g., RE06M pressure relief models) and related proportional control valves with onboard or offboard electronics for fine pressure adjustment. These valves are available in multiple mounting and connection configurations to match ISO and CETOP interfaces, offering adjustable pressure ranges and solenoid control options for precision pressure control within fluid power systems. Original Parker products, technical support, and express shipping are available.