SAE Threaded Test Cock(Standard), Stainless Steel Handles and Nuts
Side A
1"
Pressure Vacuum Breaker Backflow Preventer: Bronze Construction with FPT Threading for Irrigation Systems
Apollo's MPN 4ALF505A2F represents the pinnacle of pressure vacuum breaker engineering, specifically designed to deliver uncompromising backflow prevention in demanding commercial and residential water systems. This 1-inch bronze backflow preventer combines advanced metallurgy with precision-engineered internal components, establishing itself as the definitive solution for potable water protection where atmospheric vacuum breaker reliability meets professional installation requirements.
Apollo's MPN 4ALF505A2F represents the pinnacle of pressure vacuum breaker engineering, specifically designed to deliver uncompromising backflow prevention in demanding commercial and residential water systems. This 1-inch bronze backflow preventer combines advanced metallurgy with precision-engineered internal components, establishing itself as the definitive solution for potable water protection where atmospheric vacuum breaker reliability meets professional installation requirements.
The unit's lead-free bronze construction and modular cartridge design position it as the optimal choice for contractors seeking long-term performance with simplified maintenance protocols.
Lead-Free Bronze Construction Engineered for Maximum Corrosion Resistance
The 4ALF505A2F features Apollo's proprietary lead-free bronze alloy composition that exceeds NSF/ANSI 372 compliance standards for potable water applications. This specific bronze formulation incorporates copper-tin-zinc ratios optimized for superior dezincification resistance while maintaining the structural integrity required for 150 PSI working pressure applications.
The casting process utilizes sand-molded bronze techniques that eliminate porosity issues common in lesser manufacturing processes, ensuring consistent wall thickness throughout the 1-inch body diameter.
Apollo's metallurgical specifications for this model include chromium additives that enhance corrosion resistance in aggressive water conditions, extending operational life beyond standard brass backflow preventers in the same pressure class.
Modular Check Valve Cartridge System for Tool-Free Maintenance Access
This MPN 4ALF505A2F incorporates Apollo's innovative modular check cartridge assembly that revolutionizes field serviceability without complete valve removal from the piping and plumbing fitting connections.
The preassembled cartridge contains the spring-loaded check mechanism, poppet assembly, and sealing components within a single serviceable unit that threads directly into the bronze body casting.
This design eliminates the need for specialized tools during maintenance procedures, allowing technicians to replace the entire check assembly in under ten minutes without disrupting system piping connections.
The cartridge's internal spring mechanism utilizes stainless steel compression springs calibrated specifically for the 1-inch flow coefficient requirements, ensuring consistent closing pressure across the unit's operational temperature range of 33°F to 140°F.
Integrated Freeze-Resistant Air Relief Valve with Enhanced Opening Characteristics
The 4ALF505A2F's air relief valve assembly features Apollo's freeze-resistant design that maintains operational integrity under typical freeze-thaw cycling conditions.
Unlike conventional atmospheric vacuum breaker designs that utilize exposed air inlet ports, this model incorporates a protected relief valve mechanism with enlarged opening dimensions that prevent ice formation blockage during winter operation.
The relief valve's bronze housing contains a spring-loaded poppet that opens at precisely 1 PSI differential pressure, creating an atmospheric break that prevents back-siphonage while accommodating thermal expansion within the system.
This specific relief valve design includes drainage channels that direct moisture away from critical sealing surfaces, reducing maintenance frequency in outdoor installations subject to temperature variations.
Female NPT Threading Configuration for Universal Water Supply Integration
Apollo's 4ALF505A2F utilizes precision-machined female national pipe thread connections on both inlet and outlet ports, engineered to NPT standards for leak-free installation in diverse piping configurations.
The 1-inch FPT connections feature class 2A threading tolerances that accommodate standard pipe thread sealants and PTFE tape applications without compromising sealing integrity.
Thread engagement specifications require minimum 4.5 turns for optimal sealing performance, with the bronze threads capable of withstanding repeated installation and removal cycles without degradation.
The inlet and outlet port internal diameters maintain consistent 0.86-inch bore dimensions that minimize pressure drop while accommodating the full flow coefficient rating of 23 GPM at 10 PSI differential water pressure.
Test Cock Configuration for Certified Backflow Testing Procedures
This backflow prevention device incorporates dual test cocks positioned for optimal access during mandatory backflow testing procedures required by municipal water authorities and certified backflow tester protocols.
The SAE-threaded test ports utilize Apollo's proprietary quarter-turn ball valve design that provides positive shutoff during testing while preventing accidental opening during normal operation.
Each test cock features a captured cap design that prevents loss during field testing, with color-coded identification that simplifies backflow inspection procedures for certified technicians.
The test port positioning allows simultaneous gauge connection for differential pressure measurement across the check valve assembly, enabling rapid verification of proper operation according to AWWA standards during backflow inspection requirements.
Spring-Loaded Check Valve Mechanism Calibrated for Precise Opening Pressure
The internal check valve assembly within the 4ALF505A2F utilizes Apollo's TriForce center stem guided design that ensures consistent sealing performance across the entire water pressure range.
This specific check mechanism incorporates a stainless steel compression spring calibrated to open at 1 PSI forward pressure while providing immediate closure upon pressure reversal to prevent backflow conditions.
The check valve disc utilizes synthetic rubber compounds specifically formulated for drinking water applications, maintaining flexibility across the operational temperature range while resisting chlorine degradation typical in municipal water systems.
The center stem guidance system prevents disc flutter during variable flow conditions, eliminating pressure surges that could compromise downstream equipment or create vacuum conditions within the supply line.
Ball Valve Shutoff Integration for Complete System Isolation During Service
Apollo integrates standard ball valve shutoffs upstream and downstream of the check mechanism, providing complete system isolation capability without additional valve installations in the main water supply connection.
These quarter-turn ball valves feature full-port design that maintains the 1-inch flow pathway when fully open, eliminating restriction points that could impact system performance or create unwanted pressure variations.
The valve stems utilize PTFE packing that maintains sealing integrity throughout the pressure and temperature operating range, with handle positions that provide clear visual indication of valve status.
The bronze valve bodies are integrated into the overall assembly design, creating a compact footprint that simplifies installation in confined spaces typical of utility room and basement applications.
Pressure Rating Specifications Engineered for Municipal Water Distribution Systems
The 4ALF505A2F carries a maximum working pressure rating of 150 PSI, specifically engineered to accommodate the water pressure variations typical in municipal water distribution systems and commercial plumbing installations.
This pressure specification includes safety factors that account for water hammer conditions and system pressure surges common in large-scale plumbing installations where backflow preventers are installed as primary protection devices.
The unit's pressure testing protocols verify structural integrity at 1.5 times working pressure, ensuring reliable operation under peak demand conditions when system pressures approach maximum ratings.
Apollo's pressure certification includes burst testing at pressures exceeding 600 PSI, demonstrating the structural superiority of the lead-free bronze construction under extreme conditions that could affect other backflow prevention devices.
Temperature Performance Range Optimized for Year-Round Water System Operation
This pressure vacuum breaker operates reliably across a temperature range from 33°F to 140°F, accommodating the thermal variations encountered in both indoor and outdoor water supply installations.
The temperature specifications account for the thermal expansion characteristics of the bronze body and internal components, maintaining proper clearances and sealing integrity throughout the operational range without developing leak conditions.
Apollo's temperature testing protocols include thermal cycling procedures that verify component stability under repeated heating and cooling cycles typical in seasonal applications such as irrigation backflow prevention and fire sprinkler system connections.
The synthetic rubber sealing components utilize compounds specifically selected for dimensional stability across the temperature range, preventing leakage that could compromise backflow protection effectiveness.
Installation Requirements for Code Compliance in Backflow Prevention Systems
The 4ALF505A2F features installation specifications designed to meet municipal plumbing codes and backflow prevention system requirements for atmospheric vacuum breaker applications.
With overall dimensions optimized for 1-inch pipe systems, the unit requires minimum clearances of 6 inches above the air relief valve for proper atmospheric venting function and contamination prevention. Installation orientation specifications require the unit to be mounted with the air relief valve in the vertical upward position, ensuring proper drainage and preventing debris accumulation that could impair operation.
Apollo's installation guidelines specify minimum 12-inch clearances from electrical equipment to prevent corrosion from condensation exposure typical in utility rooms and mechanical spaces where backflow preventer installations are common.
Professional Testing Protocol Requirements for Certified Backflow Inspection
Municipal authorities require annual backflow testing of this device by certified backflow testers, with specific procedures outlined for pressure vacuum breaker inspection and documentation.
The 4ALF505A2F's test cock configuration enables rapid completion of required tests, reducing backflow testing cost for facility owners while ensuring compliance with local water authority regulations.
Certified technicians utilize the dual test ports to verify proper check valve operation and relief valve function, documenting results according to cross-connection control program requirements.
The testing procedure typically requires 15-20 minutes for complete inspection, with results submitted to municipal authorities to maintain compliance with drinking water protection regulations and avoid potential service disconnection.
Flow Coefficient Performance in High-Demand Water Applications
This backflow prevention device delivers a flow coefficient of 23 GPM at 10 PSI differential, specifically calibrated for applications requiring sustained water flow without excessive pressure loss.
The internal valve geometry optimizes fluid dynamics to minimize turbulence and pressure drop across the check valve assembly, maintaining system efficiency in irrigation systems and fire sprinkler applications.
Apollo's flow testing protocols verify performance across the full pressure range, ensuring consistent delivery whether installed in low-pressure residential applications or high-demand commercial water systems. The bronze construction eliminates concerns about pipe corrosion that could affect flow characteristics over the unit's operational lifespan.
Vacuum Breaking Technology for Atmospheric Protection Against Contamination
The 4ALF505A2F functions as an atmospheric vacuum breaker, automatically opening to atmosphere when downstream pressure drops below supply pressure, preventing back-siphonage of potentially contaminated fluid into the potable water supply.
This vacuum breaker mechanism operates independently of system pressure conditions, providing reliable protection against contamination from irrigation systems, commercial equipment connections, and other potential pollution sources.
The atmospheric opening prevents vacuum formation that could draw contaminated water backward through the system, maintaining the integrity of the main water supply connection. Apollo's vacuum breaker design incorporates fail-safe operation principles, ensuring protection even under abnormal operating conditions.
System Compatibility with Standard Plumbing & Irrigation Applications
This pressure vacuum breaker integrates seamlessly with standard 1-inch piping systems commonly found in commercial plumbing, irrigation backflow prevention, and fire sprinkler installations. The unit's bronze construction provides chemical compatibility with copper pipe, galvanized steel, and PEX plumbing systems without creating galvanic corrosion issues typical when mixing dissimilar metals. Installation flexibility accommodates both horizontal and vertical pipe runs, though proper orientation of the relief valve remains critical for atmospheric venting function. The compact design allows installation in tight spaces where larger double check valve assemblies or reduced pressure zone (RPZ) devices would not fit, making it ideal for retrofit applications in existing plumbing systems.
Maintenance Advantages Over Reduced Pressure Zone & Double Check Configurations
Unlike complex RPZ valve assemblies that require specialized tools and extensive disassembly, the 4ALF505A2F's modular cartridge design enables rapid maintenance without system shutdown or extensive pipe modifications.
The atmospheric vacuum breaker configuration eliminates the need for continuous drainage typical with reduced pressure zone devices, reducing installation complexity and ongoing maintenance requirements.
Compared to double check valve assemblies that require complete disassembly for internal component access, Apollo's cartridge system allows replacement of wearing components in minutes rather than hours.
This maintenance advantage translates to reduced service costs and minimal system downtime, particularly important in critical applications such as fire sprinkler system connections and commercial water supply installations.
Water Metering Compatibility & Downstream Equipment Protection
The 4ALF505A2F's stable pressure characteristics ensure accurate water metering downstream of the backflow preventer, eliminating measurement errors caused by pressure fluctuations from inferior valve designs.
The unit's smooth internal flow path prevents turbulence that could affect water meter accuracy, while the positive sealing check valve prevents reverse flow that could cause meter registration errors.
Installation upstream of water meters provides contamination protection for the entire downstream system, including sensitive equipment such as shower valves, kitchen equipment, and process water applications.
The bronze construction eliminates concerns about metallic contamination that could affect water quality or damage downstream equipment sensitive to corrosion products.
Professional Applications in Critical Water System Protection
This backflow preventer excels in commercial and residential applications where atmospheric vacuum breaker protection is required by municipal authorities and plumbing codes for contamination prevention. Typical installations include irrigation system connections, commercial kitchen equipment, and industrial process water applications where back flow valve protection is critical for public health.
The 4ALF505A2F's certification for potable water systems makes it suitable for direct connection to municipal water supplies in applications ranging from landscape irrigation to fire sprinkler system connections. Apollo's engineering specifications ensure compatibility with chlorinated water supplies and the chemical treatments common in municipal water distribution systems, providing reliable protection superior to basic hose bib vacuum breaker devices.
Apollo Valves has established itself as the premier manufacturer of backflow prevention equipment through decades of engineering excellence and manufacturing precision. The 4ALF505A2F represents the culmination of this expertise, delivering uncompromising protection for water systems where reliability cannot be compromised. Professional contractors and facility managers trust Apollo's engineering heritage to provide the performance and longevity required in critical water system applications.
