Relief Valves The Cross series relief valves have been designed to give long life and smooth performance at an economical price. The hydraulically dampened poppet uses differential areas to provide minimal variations between opening and full flow pressures. Request a Quote find a distributor find a distributor Request a Quote × The SRC series features dual relief and differential poppet style for cylinders or motors of equal displacement to cushion shock or surge pressures. Hydraulic Relief Valve Model RC The SRD series is bodied, "in-line" mounting, with mounting holes for 1/4" diameter bolts. Hydraulic Differential Relief Valve Model RD The RV series features screw adjustment with knob (for frequent adjustment). Hydraulic Relief Valve Model RV