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  1. Assemble A Hydraulic Pilot-operated Strain Relief Valve - Fluid Energy Journal

    In a compound relief valve, a mild spring holds the primary stage piston in order that the discharge port is generally blocked. A small quantity of fluid flows previous the principle stage piston by way of an orifice in the primary piston to the pilot stage of the relief valve. The pressure of the fluid on the pilot valve exerts a pressure on the pilot valve poppet. If the drive exceeds the spring force, the poppet is unseated, allowing a small amount of fluid to move by the drain. The vent port ...