Catalog: Backflow Preventers - Diamond Head Sprinkler Supply

Reduced PressureBackflow PreventersMATERIALSBody and coverCoatedTest CocksCheck ComponentsRelief ValveSpringsSeat DiscsFastenersElbows2-1/2” - 10”Shown w/ Optional Butterfly ShutoffsContact local water authorities forinstallation/service requirements.Fusion Bonded EpoxyDuctile Iron (mainline)Bronze (by-pass)Stainless Steel (mainline)Bronze (by-pass)Stainless Steel (mainline)Acetal (by-pass)Stainless Steel(Noryl Seat on 2.5”-6”)Stainless SteelSilicone RubberStainless SteelFusion Bonded EpoxyCoated Ductile IronRPDA-4D Series DEFENDER ®4D SERIES REDUCED PRESSURE DETECTOR ASSEMBLYThe Apollo model RPDA-4D Series is designed to provide reduced pressure principle protectionagainst cross-connections that present a health hazard; and at the same time offers precisemonitoring capability to detect leakage or unauthorized use of water from the fire or automaticsprinkler system. The RPDA-4D Series is available in sizes 2-1/2” - 10”. The unit consists of amainline 4D Series Reduced Pressure Principle assembly with two independently acting poppettype check valves with a diaphragm actuated and spring loaded relief valve assembly locatedbetween the checks. A bronze by-pass line by-passes the 2nd check. The by-pass line consists ofa meter, a single check, shut-off isolation valves, and test cocks. The relief valve on the mainlinedevice maintains high hazard protection, as the by-pass is downstream of the reduced pressurezone.OPERATIONDuring normal conditions, the mainline device provides normal reduced pressure backflowprotection against back-siphonage or backpressure. If a backflow condition should occur the twomainline poppet style checks along with the by-pass single check will close tight. If there is a lowflow demand (up to a minimum of 2 gpm) of water downstream, which may be caused by a systemleak or unauthorized use, the flow is routed through the water meter to monitor such consumption.Higher flows will open the mainline checks as required.FEATURES• Low pressure loss characteristics(without high curve spikes)• 4D Series Mainline Valve ProvidesSuperior Durability• Low Maintenance By-Pass Line(no relief valve to maintain)• Reversible/Replaceable Silicone RubberSeat Discs• Dependable Neoperl Check ModuleUtilized in Single Check• Available with Monitored Butterfly Valves• Short Lay Length• Maximum working pressure 175 PSI• Operating temperature range 33°F-140°F• UL Classified• FM approved• ASSE1047• CSA• US Patent #6,443,184 B1(other patents pending)• Easy Access for Maintenance• Designed, manufactured, assembled andtested in South Carolina, USAORDERING CODE -4D - 7 0 X - X X XSIZE9 -2-1/2”0 -3”A -4”C -6”E -8”G-10”METERC - With Meter in CubicFeetE - With Meter in GallonsG - Less MeterGATE VALVES1* - Less Shut-off Valves9 - With Grooved x Grooved Butterflyvalves (Supervisory switch)*4D Defender valve body hasgrooved x grooved connectionsFLOW (OPTIONAL)U - with twoelbows (canbe field adjustedup or down)See page 37 forair gap drain information.20Dimensions (in) - Weights (lbs.)Size 2 1/2" 3" 4" 6" 8” 10”A (Butterfly Valves) 33 3/8 33 7/8 35 38 1/2 48 52 1/2B 21 3/8 21 3/8 21 3/8 24 1/2 32 32C (With Butterfly Valves) 10 5/8 10 5/8 10 5/8 13 15 15D 10 3/4 10 3/4 10 3/4 11 3/4 15 1/4 15 1/4E1 (center to coupling edge) 6 1/2 6 1/2 6 1/2 7 3/4 10 10E2 (center to by-pass edge) 11 11 11 11 14 1/2 14 1/2F (w/Elbows & Butterfly Valves) 8 8 1/2 9 1/4 10 1/4 12 3/4 14 1/2G 27 3/8 28 1/8 29 3/4 35 1/2 46 50 1/4H “n” Flow (with Butterfly Valves) 20 3/8 21 1/8 22 3/8 26 1/2 29 3/4 34I “Z” Flow (with Butterfly Valves) 19 1/2 21 23 1/4 27 30 38Test Cocks 1/2 NPT 1/2 NPT 1/2 NPT 3/4 NPT 3/4 NPT 3/4 NPTNet Wt. (Less Gate Valves) 118 119 124 207 429 434Net Wt. (w/Butterfly Valves) 141 143 163 270 551 616Net Wt. (w/Elbows & Butterfly Vlvs) 150 155 183 307 593 724Shpg. Wt. (Less Gate Valves) 182 183 188 305 505 510Shpg. Wt. (w/Butterfly Valves) 208 210 230 378 627 692Shpg. Wt. (w/Elbows & Butter Vlvs) 217 222 250 415 693 824Customer Service 1-704-841-6000