BACKFLOW PREVENTERS - Conbraco Industries - #4

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4 Double Check Valve Backflow Preventers Customer Service 1-704-841-6000 TOP ENTRY DOUBLE CHECK VALVE ASSEMBLY The Apollo MODEL DC4A Double Check Valves are designed to prevent contamination of the potable water supply due to back-siphonage or backpressure from substances that are objectionable, but non-health hazards. The modular check valve cartridges have replaceable seats and reversible silicone seat discs. Apollo ball valve shut-offs with stainless steel handles and nuts are standard. OPERATION During normal flow conditions, the two check valves are held off their seats, supplying water downstream. Each check valve is designed to maintain a minimum of 1 psi across the valve during normal operation. Should the downstream pressure increase to within 1 psi of supply pressure, both check valves will close to prevent a backflow condition. FEATURES • Low pressure loss • Captured spring cartridge check valves • Compact yet easy to maintain • Apollo ball valves w/ SS handles & nuts standard • Top access for testing, fast repair and maintenance • Corrosion resistant • No special tools required • 5 year, domestic warranty • UL - Pending • ASSE 1015 (other approvals pending*) • CSA • Chloramine-resistant elastomers • Patent pending • Horizontal and vertical up approvals* • Maximum working pressure 175 psi • Temperature range 33°F - 180°F • Designed, manufactured, assembled and tested in South Carolina, USA Sizes 1/2", 3/4”, 1", 1-1/4", 1-1/2", 2" DC-4A Series MATERIALS Body Bronze Caps Cast Bronze C84400 Check Valves Glass-Filled PPO Springs 300 Series Stainless Steel Seat Discs Chloramine-resistant Silicone O-rings Chloramine-resistant EPDM Ball Valve Handles Stainless Steel Dimensions (in) (mm) Net Ordering No. Model No. Size A B C D Wt. lbs.(kg.) 4A-103-T2 DC4A12 1/2” (15) 10-3/4 (275) 7-3/8 (187) 3-1/8 (80) 2-3/8 (60) 4.4 (2.0) 4A-104-T2 DC4A34 3/4” (20) 12-1/2 (318) 8-1/2 (215) 3-3/8 (85) 3 (75) 6.0 (2.7) 4A-105-T2 DC4A1 1” (25) 15-1/4 (387) 9-1/2 (241) 3-7/8 (98) 3-1/4 (83) 10 (4.5) 4A-106-T2 DC4A114 1-1/4”(32) 18 (460) 11-3/4 (298) 4-3/8 (111) 4-1/4 (108) 14 (6.4) 4A-107-T2 DC4A112 1-1/2”(40) 18-5/8 (470) 11-5/8 (295) 4-3/8 (111) 4-3/4 (120) 17 (7.7) 4A-108-T2 DC4A2 2” (50) 21-1/2 (546) 12-3/4 (324) 4-7/8 (124) 5-3/8 (136) 25.4 (11.5) 4A [X] - 1 X X - TXX Y-STRAINER 0-Standard 1-w/ Y-strainer (shipped loose) SHUT-OFF VALVES 1-less ball valves 2-w/ball valves (Standard) 3-w/OS&Y gate valves 4-w/union ball valves 9-w/butterfly shutoffs with supervisory switches SIZE 3-1/2” 4-3/4" 5-1" 6-1-1/4" 7-1-1/2" 8-2" OPTIONS (CAN BE COMBINED) F-SAE threaded test cocks (standard 1/2” 3/4”, 1”) LL-locking lever handles (1-1/4”, 1-1/2”, 2”) LR -Locking round handles (1/2”, 3/4”, 1”) Example: 4A-104-T4LL = 3/4” double check valve assembly with union ball valves with locking lever handles ORDERING CODE - *Contact factory for approval details SEE PAGE 56 FOR FLOW CURVES 4A - Standard 4ALF - Lead Free