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FEBCO SPECIFICATION SHEET NO. 825 (21/2"-10 Model 825 (21/2" through 10") Reduced Pressure Backflow Preventer For High Hazard Service a ea 7'e4e� Metre �Izo.cfed ens 7 - ❑ Revise and Resu'- CM1ecking is ontc�(y tenfemr.ISIA rM1c �e„oma .n. Ilse OrO1P.Cf Tn{ COl lfacnpp nnerL G...I, .- ,.V d setev io lire faJ ! - a i fir cocrd r � 4- I, •Shown with optional O S&Y gate valves. Features and discharge to maintain the zone at least 2 PSI lower • Ultimate mechanical protection of potable water than the inlet pressure: thus preventing the contamination of the supply. against hazards of cross connection contamination. •Meets all specifications of AWWA, ASSE, CSA Materials and USC Foundation for Cross Connection Control and Hydraulic Research and UL classified for fire Bronze bodies and trim are used on 825 units 2”and smalle line service 825 2-112"through 10" are cast iron bodies with bronze trim • Documented flow curves established by University and have internal epoxy coating standard. of Southern California Foundation for Cross Nitrile seat discs and fabric reinforced nitrile diaphragms. Connection Control and Hydraulic Research. Gate valves supplied are non-rising stem. OS&Y gate valvE '.: •Simple service procedures. All internal parts and resilient wedge gates valves optional. serviceable in line. Specifications • Double diaphragm differential relief valve. The reduced pressure backflow preventer shall consist of • Independent spring loaded "Y"type check valves. two separate spring loaded "Y" type check valves and one • Replaceable seats on both check valves and differential relief valve having two diaphragms separated b differential relief valve a spacer. This device shall automatically reduce the pressure in the"zone" between the check valves. Should •Corrosion resistant internal parts the differential between the upstream and the zone to the unit drop to 2 PSI, the differential relief valve shall open anc Description maintain the proper differential The Febco 825 RP Device consists of two Both check valves and the differential relief valve shall be independent"Y" pattern spring loaded check valves. a constructed so they may be serviced without removing the differential pressure relief valve mounted between the two device from the line. checks, and three lest cocks. An inlet shutoff valve with a Backflow preventers 2" and smaller shall have bronze fourth lest cock and an outlet shutoff valve are added to bodies and trim. 2-112" and larger shall have cast make a complete and serviceable assembly. In normal iron bodies with internal epoxy coating and bronze trim. operation. the check valves are open with the pressure Rated to 175 PSI working pressure and water temperature between the checks, called the zone, being maintained from 32eF to 140eF. at least 5 PSI lower than the inlet pressure and the relief The device shall meet the requirements of ASSE Standard valve is maintained closed Should abnormal conditions 1013. AWWA Standard C506-78. and USC Foundation for arise under backflow, the differential relief valve will open Cross Connection Control and Hydraulic Research.