TM 5-3895-374-24-2SECTION 20BULLETIN 20.96 RRELIEF VALVE INSTRUCTIONSDISASSEMBLY(1)Remove valve bonnet.(2)Measure and record the length of extension of theadjusting screw.(3)Loosen the adjusting nut and rotate the adjustingscrew counter-clockwise until the spring pressure isreleased fully.(4)Remove the cap, retainer disc spring and poppet,from the valve body Clean and inspect all parts forwear or damage and replace if necessaryREASSEMBLYSimply reverse the procedure outlined under disassembly Ifthe valve has been removed from the pump for inspection, besure to replace in the same position The bonnet should pointtowards the suction port.PRESSURE ADJUSTMENTThe pressure setting on any relief valve supplied on a pumpshould be adjusted and/or checked for setting on individualapplications as the valve is supplied with a spring that isadjustable within a given pressure range.To check the setting place a pressure gauge in the dischargeline between the pump and discharge gate valve. Slowly closethe gate valve until full bypass pressure is obtained. Thispressure should be greater than the normal operatingpressure. If not. it can be increased by turning the relief valveadjusting screw inward until the desired setting Is achieved.After the relief valve has been set. the locking nut can betightened and the bonnet can be re-assembled.When ordering relief valve springs, be sure to state themaximum operating pressure required.REPLACEMENTPARTSLISTPage 3 - 1200
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