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
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.
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.
Each check valve incorporates captured coil springs that maintain positive seating force against reversible silicone disc seats, ensuring immediate closure response when forward flow momentum ceases or reversal pressure develops.
The modular cartridge design enables individual check valve removal through top-access ports without disturbing pipe connections or adjacent valve components.
Should either check valve experience seat leakage due to debris accumulation or wear progression, the relief valve automatically discharges water to atmosphere when intermediate zone pressure rises within 2 PSI of supply pressure. This fail-safe discharge mechanism provides visible indication of check valve deterioration while maintaining absolute separation between potentially contaminated downstream water and protected upstream supply.
The relief valve spring calibration in this 1-1/2 inch model responds to pressure differentials with exceptional sensitivity, opening at precisely engineered thresholds that balance nuisance discharge prevention against rapid contamination response. Stainless steel relief valve components resist corrosion from atmospheric exposure and maintain calibration accuracy across thousands of operation cycles.
NPT Threaded Connection System & Installation Compatibility Parameters
Standard NPT female threads on both 1-1/2 inch inlet and outlet ports facilitate direct installation into existing iron pipe, copper tube, or CPVC piping systems using appropriate male adapters and thread sealants. The tapered thread geometry creates mechanical interference that achieves leak-tight connections at 175 PSI operating pressure without requiring supplemental compression fittings or flanged joints.
Thread engagement depth specifications for the 4ALF207A2F require minimum insertion of four complete threads to develop full pressure rating, with PTFE tape or approved pipe dope applied to male adapter threads before assembly.
Proper thread preparation prevents galling of bronze surfaces during installation torque application while ensuring gasket compression reaches manufacturer specifications.
The 18-inch overall width dimension between connection centerlines accommodates straight pipe runs or close-coupled installation between existing pipe anchors in retrofit applications.
Vertical or horizontal mounting orientations both satisfy operational requirements, though horizontal positioning with relief valve discharge directed downward optimizes drainage and maintenance accessibility.
Installation clearance requirements specify minimum 12-inch spacing above the valve body to permit test cock access and check valve cartridge removal without adjacent pipe interference. Side clearances of 6 inches enable ball valve handle operation and provide adequate space for pressure gauge installation on test cock ports during backflow inspection procedures.
Integrated Ball Valve Isolation & Service Accessibility Features
Factory-installed ball valves on inlet and outlet sides of the 4ALF207A2F eliminate the need for separate isolation valves while providing quarter-turn full-port shutoff capability rated to 600 PSI working pressure.
Stainless steel valve handles incorporate textured gripping surfaces and high-visibility positioning indicators that enable rapid identification of valve status during emergency response or routine maintenance.
Full-port ball valve design maintains consistent 1-1/2 inch flow path diameter throughout the assembly, minimizing pressure loss to documented values below 5 PSI at maximum rated flow velocity. This low-resistance configuration reduces pump energy consumption in recirculation systems and maintains adequate downstream pressure for multi-story building distribution.
Ball valve seats utilize resilient PTFE material that accommodates minor debris passage without permanent damage while providing bubble-tight shutoff across the complete 33 to 180 degree Fahrenheit temperature range. Blowout-proof stem design prevents accidental handle separation during operation and incorporates adjustable packing that permits external leak sealing without valve disassembly.
The inlet ball valve includes a removable strainer basket that captures scale particles, pipe debris, and welding slag before these contaminants reach sensitive check valve seating surfaces.
Access to this strainer requires only inlet valve closure and removal of the threaded end cap, enabling periodic cleaning without system depressurization or downstream shutdown.
SAE Test Cock Configuration & Certified Tester Interface Standards
Two SAE 1/4-inch threaded test cocks positioned between check valves and on outlet side of the assembly provide standardized connection points for differential pressure measurement during mandatory annual backflow testing. These test ports accept standard backflow tester gauge fittings without requiring adapters or specialty tools, reducing inspection time and ensuring consistent measurement accuracy across different testing equipment.
Test cock positioning on the 4ALF207A2F follows AWWA C-511 spacing requirements that prevent cross-contamination between measurement zones during simultaneous pressure readings.
Spring-loaded needle valves within each test cock maintain zero-leak integrity when closed while opening instantly to full flow position when tester probes are inserted.
Brass test cock bodies resist thread wear from repeated gauge connection cycles, maintaining thread integrity through hundreds of annual inspection procedures over the assembly's service life.
Cap chains prevent test cock cap loss during testing operations and protect internal needle valve components from debris ingress during normal operation periods.
Color-coded test cock identification follows industry standard conventions with inlet pressure measured at the red-marked port, intermediate zone pressure at the green port, and outlet pressure at the blue test position. This standardized color system enables rapid tester orientation and reduces measurement errors that compromise inspection validity.
Pressure Loss Characteristics & Flow Performance Documentation
Independent laboratory testing by approved certification agencies documents pressure loss through the 4ALF207A2F at various flow rates, with typical drop of 3-4 PSI at design flow velocity for 1-1/2 inch pipe systems. This minimal resistance preserves available pressure for downstream fixtures and appliances while maintaining adequate flow capacity for fire sprinkler system charging or high-demand industrial processes.
Flow coefficient (Cv) values specific to this model enable hydraulic engineers to calculate exact pressure loss predictions when designing pump systems or sizing backflow preventer installations for known demand profiles.
The assembly maintains laminar flow characteristics throughout its rated capacity range, avoiding turbulent eddies that accelerate erosion or generate noise in sensitive installation environments.
Pressure loss remains consistent across the 33 to 180 degree temperature spectrum as bronze thermal expansion and silicone seat compression both exhibit minimal dimensional change with temperature variation. This stable performance ensures reliable operation in both chilled water systems and heating applications without seasonal adjustment requirements.
Maximum flow capacity documentation provides certified GPM ratings at various inlet pressures, enabling proper sizing verification for specific building water demand calculations including simultaneous fixture use and fire protection reserve requirements.
Conservative design factors incorporated in these ratings accommodate future demand growth without premature undersizing concerns.
Modular Check Valve Cartridge Design & Field Service Capabilities
Top-accessed check valve cartridges in the 4ALF207A2F extract vertically from the valve body after removing hex cap retainers, enabling complete check valve rebuilding without disconnecting pipe threads or disturbing ball valve settings. This modular architecture reduces maintenance labor costs and minimizes system downtime during routine seat replacement or spring service.
Each cartridge contains captured coil springs that remain confined within the assembly during removal, preventing spring loss or accidental personnel injury during disassembly procedures. Reversible silicone disc seats provide dual-sided wear surfaces that double service intervals by allowing simple seat flip orientation rather than requiring complete seat replacement.
Cartridge bore dimensions maintain precise tolerances that ensure concentric disc alignment with seating surfaces while permitting sufficient clearance for debris bypass to the intermediate zone relief discharge. This design balance prevents jamming from particle ingress while maintaining leak-tight sealing under normal operating conditions.
Replacement cartridge assemblies ship as complete units with factory-preset spring tension and pre-installed seats, eliminating field adjustment requirements and ensuring consistent performance restoration after maintenance. Compatible with all 4ALF-200 Series assemblies, these cartridges provide long-term parts availability and simplified inventory management for facility maintenance departments.
Maximum Contamination Protection & Hazardous Substance Isolation Performance
The 4ALF207A2F provides maximum protection classification suitable for high-hazard cross-connection scenarios including boiler chemical feed systems, industrial cooling towers, hospital laboratory equipment, and commercial car wash reclaim systems. This protection level exceeds capabilities of double check valve assemblies or atmospheric vacuum breakers that prove inadequate for toxic substance isolation.
Relief valve discharge to atmosphere creates absolute air gap separation between potentially contaminated intermediate zone and protected supply pressure, ensuring zero backflow potential even during simultaneous check valve failure conditions. This redundant protection architecture satisfies stringent health department requirements for medical facilities, food processing plants, and potable water distribution containment.
Contamination scenarios involving sewage backpressure, chemical injector siphonage, or auxiliary supply interconnection all face effective mitigation through the dual check valve barrier and pressure-actuated relief discharge mechanism. The assembly responds to backpressure and back-siphonage conditions with equal effectiveness, providing comprehensive protection regardless of reversal force origin.
Installation at service entrance locations protects entire building plumbing systems from external contamination sources while allowing unrestricted internal fixture use without individual device requirements. This containment strategy reduces installation costs and simplifies compliance documentation for building inspectors and water purveyors.
ASSE 1013 approval certifies the 4ALF207A2F meets American Society of Sanitary Engineering performance standards for reduced pressure principle backflow prevention assemblies including endurance testing, pressure loss validation, and contamination prevention verification. This foundational approval provides universal acceptance by plumbing codes and water authority regulations nationwide.
NSF 61 certification verifies all wetted materials meet drinking water contact requirements with zero leaching of harmful substances into potable supply during extended exposure periods. Complementary NSF 372 approval confirms lead-free compliance for California and federal safe drinking water regulations affecting installations after January 2014.
CSA B64.4 certification extends product approval into Canadian jurisdictions where provincial plumbing codes require independent third-party validation of backflow preventer performance characteristics. UL classification for fire protection applications enables use in fire sprinkler system supply lines where auxiliary water sources create cross-connection hazards.
AWWA C-511 compliance ensures the assembly meets American Water Works Association specifications for field testing procedures and acceptance criteria applied during annual backflow inspection requirements. Foundation for Cross-Connection Control approval confirms the device satisfies recommendations from the leading authority on backflow prevention technology and policy development.
Mandatory annual backflow testing protocols require certified backflow tester near me engagement to verify continued check valve sealing integrity and relief valve opening setpoint accuracy using calibrated differential pressure gauges. The 4ALF207A2F's SAE test cock configuration standardizes this procedure across all qualified inspection professionals.
Backflow inspection procedures measure four critical pressure relationships: inlet static pressure, intermediate zone pressure during flow and no-flow conditions, check valve closing pressure differential, and relief valve opening threshold. Test results compared against manufacturer specifications determine pass/fail status and identify maintenance requirements before complete protection failure occurs.
Failed backflow testing triggers mandatory repair or replacement before system return to service, with documented backflow inspection near me results submitted to water authority officials for cross-connection control program compliance verification. The 4ALF207A2F's modular design enables rapid field repair to minimize building water service interruption during compliance restoration.
Backflow testing cost averages $75-150 for residential assemblies and $150-300 for commercial installations depending on regional labor rates and accessibility factors. Investing in easily testable assemblies like the 4ALF207A2F reduces long-term inspection expenses through simplified access and straightforward testing procedures that minimize billable technician time.
Municipal Water Supply Protection & Cross-Connection Control Implementation
Water purveyors mandate backflow preventer installation at residential and commercial service connections where auxiliary water supplies, chemical injection systems, or potential contamination sources create cross-connection hazards to the main water supply network. The 4ALF207A2F satisfies these containment requirements for high-hazard classifications.
Cross-connection control programs identify specific installation locations requiring reduced pressure zone device protection rather than lesser protection methods like double check valve assemblies or pressure vacuum breaker configurations. Facilities with boiler systems, irrigation connections to ponds or streams, fire sprinkler system antifreeze, or industrial process equipment typically mandate RPZ valve installation.
Public water system protection depends on properly functioning backflow prevention assemblies preventing contamination from individual service connections during main water pressure loss events caused by fire fighting demand, distribution pipe breaks, or pump station failures. Each 4ALF207A2F unit serves as a critical contamination barrier within comprehensive water quality defense strategies.
Water metering installations commonly position the backflow device immediately downstream of the customer meter to protect utility infrastructure while placing maintenance responsibility on the property owner. This configuration enables water authority enforcement of testing compliance through service disconnection threats for non-responsive customers.
Fire Sprinkler System Applications & Antifreeze Solution Isolation Requirements
Fire sprinkler systems containing antifreeze solutions, foam concentrates, or connected to auxiliary water tanks require reduced pressure zone backflow preventers like the 4ALF207A2F to prevent these substances from contaminating potable water supplies during pressure equalization events. UL-classified models specifically address these fire protection applications.
Sprinkler system designers calculate required flow rates and pressure availability for the backflow preventer installation point, selecting 1-1/2 inch sizing for systems protecting structures up to 15,000 square feet depending on sprinkler head density and pipe network design. Oversizing the backflow assembly minimizes pressure loss that could compromise sprinkler discharge performance during fire events.
Wet pipe sprinkler systems in cold climates often incorporate propylene glycol antifreeze in exposed piping sections, creating a high-hazard cross-connection that demands RPZ protection rather than simpler double check valve assemblies. The 4ALF207A2F's relief valve discharge accommodates periodic test water expulsion without creating hazardous slip conditions in mechanical rooms.
Combination fire sprinkler and domestic water systems must install separate backflow preventers on each branch to isolate cross-contamination pathways while maintaining adequate supply pressure for both systems during simultaneous demand. The 4ALF207A2F's low pressure loss characteristics prove advantageous in these multi-system installations.
Commercial & Industrial Installation Scenarios Requiring Maximum Protection
Hospital and laboratory facilities utilize hazardous chemicals, radioactive isotopes, biological cultures, and pathogenic specimens creating extreme contamination risks that mandate reduced pressure zone device installation on main service lines and individual equipment connections. The 4ALF207A2F provides appropriate protection for these critical applications.
Car wash operations reclaim rinse water containing detergents, waxes, petroleum residues, and suspended solids that present severe contamination threats if backpressure conditions force this water into potable supply lines during pressure fluctuations. The assembly's dual check valve configuration ensures reliable isolation despite the challenging service environment.
Commercial laundry and dry cleaning facilities using solvents, bleaching chemicals, and fabric treatment compounds require RPZ protection at service entrances and individual equipment connections where mixing valves create direct cross-connection hazards. The 1-1/2 inch capacity suits mid-sized commercial laundry applications.
Food processing plants, beverage production facilities, and restaurant commissaries all face stringent health department regulations requiring documented backflow prevention programs with annual certified testing protocols the 4ALF207A2F satisfies. Bronze construction proves ideal for these applications given its resistance to cleaning chemical exposure.
Irrigation System Backflow Prevention & Fertilizer Injection Contamination Control
Landscape irrigation systems drawing from ponds, streams, or wells create cross-connections requiring backflow preventer installation where these auxiliary supplies interconnect with potable water for supplemental capacity or system charging. The 4ALF207A2F protects against both backpressure scenarios from elevated water sources and back-siphonage from supply pressure loss.
Fertilizer injection systems, pesticide applicators, and herbicide proportioners introduce toxic chemicals into irrigation piping that absolutely cannot reverse into drinking water supply lines during pressure transients or supply interruptions. Maximum protection assemblies prevent catastrophic contamination events that could sicken entire neighborhoods served by affected water mains.
Golf course irrigation, athletic field watering, and commercial landscape systems all face mandatory backflow preventer requirements from water purveyors before service activation, with annual inspection and testing prerequisites for continued water supply. The 4ALF207A2F satisfies these regulatory requirements while providing adequate capacity for 1-1/2 inch irrigation zone control valve manifolds.
Drip irrigation systems serving vegetable gardens and fruit orchards often incorporate water-soluble fertilizers that create high-hazard cross-connections despite the agricultural application's seemingly benign nature. Health regulations make no distinction between commercial and residential fertilizer injection regarding protection requirements.
Plumbing System Retrofits & Building Code Upgrade Installations
Existing buildings undergoing plumbing renovations frequently require backflow preventer upgrades when new equipment installations, system modifications, or code enforcement actions identify previously unprotected cross-connections. The 4ALF207A2F's compact 18-inch width facilitates retrofit installations in congested mechanical rooms.
Copper pipe systems with existing 1-1/2 inch supply lines accommodate the assembly through standard sweat-to-NPT adapters that provide reliable threaded connections while preserving system pressure rating and flow capacity. Iron pipe threads directly into the bronze NPT ports using appropriate thread sealant and measured torque application.
Vertical pipe installations in confined spaces benefit from the assembly's horizontal mounting capability with relief valve positioned for gravity drainage to floor drains or catch basins that safely convey test discharges away from electrical equipment. Seismic restraint provisions may require supplemental support brackets on the valve body itself rather than relying solely on adjacent pipe support.
Building owners facing compliance orders from local health departments or water authority officials benefit from the 4ALF207A2F's immediate availability and straightforward installation requirements that enable rapid regulatory compliance restoration. The five-year factory warranty provides additional confidence for retrofit investment decisions.
Warranty Coverage & Quality Assurance Commitments from Apollo Valves
Apollo Valves backs the 4ALF207A2F with a comprehensive five-year factory warranty covering manufacturing defects, material failures, and workmanship issues discovered during normal service applications within rated pressure and temperature parameters. This extended coverage period reflects manufacturer confidence in bronze metallurgy selection and assembly quality control processes.
Warranty service provisions include replacement component shipment or complete assembly exchange depending on failure mode assessment, with technical support available to diagnose field performance concerns and recommend appropriate corrective actions.
Made in America manufacturing ensures consistent quality standards and simplified warranty claim processing.
Quality control testing procedures verify each assembly meets pressure testing, relief valve calibration, and check valve seating specifications before shipment, reducing field installation failures and premature maintenance requirements. Serialized production records enable traceability for quality audit compliance and warranty validation purposes.
Plumbing Supply & More delivers authentic Apollo Valves products including the 4ALF207A2F reduced pressure zone backflow preventer, ensuring customers receive factory-certified assemblies with full warranty coverage and technical support access for mission-critical water system protection applications.
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