The Apollo 4ALF207A2F represents engineered excellence in reduced pressure zone backflow prevention, delivering maximum contamination protection through its specialized 1-1/2 inch bronze construction rated for 175 PSI continuous operation. This lead-free assembly provides superior defense against both back-siphonage and backpressure conditions that threaten potable water systems in commercial, industrial, and municipal applications. Manufactured to stringent NSF 61/8/G/372 standards and ASSE 1013 specifications, this MPN 4ALF207A2F model incorporates dual independent check valves with a pressure-monitored intermediate zone maintained at lower pressure than supply conditions. The 18-inch width and 9-7/8 inch height dimensions accommodate installation in confined mechanical spaces while providing complete serviceability through top-accessed modular components. Bronze body construction ensures corrosion resistance across temperature ranges from 33 to 180 degrees Fahrenheit, while NPT threaded connections facilitate secure integration into existing pipe networks. The assembly features integrated ball valves with stainless steel handles positioned on both inlet and outlet sides, plus SAE threaded test cocks that enable certified backflow tester verification without system shutdown. Lead-Free Bronze Metallurgy & Corrosion-Resistant Engineering Specifications The 4ALF207A2F utilizes lead-free bronze alloy throughout all wetted surfaces, meeting Federal Public Law 111-380 requirements for drinking water contact applications while delivering exceptional resistance to dezincification and stress corrosion cracking. This specific bronze formulation maintains structural integrity when exposed to chlorinated water supplies, aggressive groundwater chemistry, and fluctuating pH conditions encountered in municipal distribution networks. Bronze's inherent antimicrobial properties provide additional contamination defense by inhibiting bacterial colonization on valve surfaces during extended service periods. The material's thermal conductivity enables efficient heat dissipation during high-flow demand cycles, preventing thermal stress that compromises valve seating surfaces in alternative materials like brass or ductile iron. Dezincification-resistant bronze composition ensures the 4ALF207A2F maintains pressure boundary integrity throughout its operational lifespan, avoiding the selective leaching failures common in standard brass assemblies subjected to soft water or elevated chlorine concentrations. This metallurgical stability proves critical for installations serving hospitals, food processing facilities, and laboratories where cross-connection control cannot tolerate gradual valve deterioration. Reduced Pressure Zone Architecture & Dual Check Valve Operation The 4ALF207A2F employs two independent spring-loaded check valves positioned in series configuration, creating an intermediate pressure zone continuously monitored by a centrally-mounted relief valve assembly. This reduced pressure zone operates at approximately 2 PSI below supply pressure during normal flow conditions, establishing a hydraulic barrier that prevents contaminated water from reversing direction into the main water supply system.
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