Catalog: Backflow Preventers - Diamond Head Sprinkler Supply

Double Check ValveBackflow PreventersDC-4A SeriesTOP ENTRY DOUBLE CHECK VALVE ASSEMBLYThe Apollo MODEL DC4A Double Check Valves are designed to prevent contamination of thepotable water supply due to back-siphonage or backpressure from substances that areobjectionable, but non-health hazards. The modular check valves have replaceable seats andreversible silicone seat discs. Apollo ball valves with stainless steel handles and nuts arestandard.Sizes 1/2", 3/4”, 1", 1-1/4", 1-1/2", 2"OPERATIONDuring normal flow conditions, the two check valves are held off their seats, supplying waterdownstream. Each check valve is designed to maintain a minimum of 1 psi across the valveduring normal operation. Should the downstream pressure increase to within 1 psi of supplypressure, both check valves will close to prevent a backflow condition.FEATURESMATERIALSBodyCast Bronze C84400CapsCast Bronze C84400Check Valves Glass-Filled Noryl ®Springs300 Series Stainless SteelSeat DiscsChloramine-resistantSiliconeO-ringsChloramine-resistant EPDM• Low pressure loss• Modular check valves• Compact yet easy to maintain• Apollo ball valves w/ SS handles & nutsstandard• Top access for testing, fast repairand maintenance• Corrosion resistant• No special tools required• Chloramine-resistant elastomers• Patent pending• ASSE 1015 horizontal and vertical flowup• Maximum working pressure 175 psi• Temperature range 33°F - 180°F• Designed, manufactured, assembledand tested in South Carolina, USAFlow Curves : Rated (*) Rated flow flow as as determined by by USC’s ASSE FCCC&HR design andperformance ASSE design standards.performance standards.Dimensions (in)Ordering No. Size A B C D Wt.4A-103-T2 1/2” 10-3/4 7-3/8 3-1/8 2-3/8 4.44A-104-T2 3/4” 12-1/2 8-1/2 3-3/8 3 6.04A-105-T2 1” 15-1/4 9-1/2 3-7/8 3-1/4 104A-106-T2 1-1/4” 18 11-3/4 4-3/8 4-1/4 144A-107-T2 1-1/2” 18-5/8 11-5/8 4-3/8 4-3/4 174A-108-T2 2” 21-1/2 12-3/4 4-7/8 5-3/8 Pend4Customer Service 1-704-841-6000