Cartridge Pressure Relief Valves

Technical Features: • Excellent stability throughout fl ow range with rapid response to dynamic pressure changes • Low hysteresis, accurate pressure control and low pressure drop through CFD optimised fl ow paths • Wide pressure range up to 420 bar • Hardened precision parts • Sharp-edged steel seats for dirt-tolerant performance • Leak-free closing, suitable for fast cycling with long life • Adjustable by Allen key or hand screw • In the standard version, the valve is zinc-coated for 240 h protection according to ISO 9227 Function: • Poppet-type, direct-acting hydraulic relief valve • Screw-in cartridge design • Intended for use as a pressure-limiting device for common hydraulic circuit protection • The spring acts on the poppet and presses it onto the valve seat • If the hydraulic pressure is below the preset value, the valve is closed • If the hydraulic force exceeds the preset value, the valve opens and fl ow passes to the tank port until the system pressure falls below the spring preset value and the valve closes again