Purpose BACK PRESSURE VALVES maintain a set pressure at the pump outlet port (discharge) to assure accurate metering and are also used to prevent syphoning. Use of the Back Pressure Valve assures proper metering pump check valve operation when the system pressure against which the pump is injecting fluid is too low. The Back Pressure Valve is a required accessory when pumping to a low pressure injection point below the tank level or when pumping from a bulk tank with a high head pressure. RELIEF VALVES protect the piping and system from overpressure. Discharge is piped to tank. Features BACK PRESSURE VALVES • Broad range of valve body materials • Long life Teflon® diaphragm • Field adjustable to a maximum back pressure of 50 psi • Low maintenance RELIEF VALVES • Broad range of valve body materials • Long life Teflon® diaphragm • Field adjustable to a maximum pressure of 150 psi • Low maintenance • Two port design on 1/2" models • Right angle, three port design on 3/4" and 1" models eliminate the need for a separate "T" fitting in the piping (two port design available only for 1-1/2" units).

BACK PRESSURE VALVES MODEL NUMBER RELIEF VALVES MODEL NUMBER *Only one inlet provided on 1/2” PVC and Kynar Relief Valves REPAIR KITS Each kit contains a replacement spring, diaphragm, threaded adjuster and support disk. PART NUMBER Neptune ft 5 POUHO COMPMIT P.O. Box 247 • Lansdale, PA 19446-0247 Tel: 215-699-8700 • Fax: 215-699-0370 Toll-Free Tel: 1-888-3NEPTUNE (1-888-363-7886) Toll-Free Fax: 1-800-255-4017 Web Site: http://www.neptune1.com E-mail: [email protected]

Relief Valve. Features • All wetted parts are 316SS or Carpenter 20 • Pressures from 30 to 2000 psi • Spring guide for consistent relief capacity • Easily adjustable relief setting • Liquid service only Neptune Relief Valves have two outstanding characteristics: • economy • simplicity Economy. Models RV-316-1, -2, -3 and -4 with all 316SS wetted parts cost no more than other 304SS designs. Carpenter 20 valves are also available as standard. Simplicity. Neptune's exclusive design uses a self-cleaning ball check and seat. It has a unique spring guide which assures proper spring loading and consistent...