8" Double Check Assembly With FxG OSY For Fire Safety

This 8-inch double check valve assembly safeguards municipal and facility potable water supplies from contamination within commercial and residential fire protection systems. Installed inline on fire sprinkler supply piping, the assembly utilizes two independently operating spring-loaded check modules to prevent hazardous reverse flow. Complying with cross-connection control mandates and standard fire protection engineering practices, this backflow preventer satisfies stringent installation requirements governed by NFPA 13 and NFPA 25 for commercial plumbing safety and annual diagnostic testing.

Equipped with outside screw and yoke (OS&Y) gate valves, the unit provides a clear visual indicator of open/closed status and allows positive shut-off capability during maintenance. Built-in test cocks streamline required annual field testing and diagnostic procedures without removing the device from service. The rugged construction supports flexible installation in both horizontal and vertical upflow orientations to accommodate mechanical room spatial constraints.

Key Features & Construction

• Ductile Iron Body: Engineered from ASTM A536 fusion-bonded epoxy-coated ductile iron for maximum resistance to corrosion and mechanical wear.
• Thermoplastic Check Modules: Utilizes glass-filled Noryl thermoplastic check components to provide high structural strength and chemical resistance.
• Stainless Steel Hardware: Incorporates forged 300-series stainless steel springs and fasteners to prevent rust in damp environments.
• Replaceable Sealing Elements: Features reversible and replaceable EPDM elastomer valve discs that secure a tight seal against backflow.
• High-Pressure Operation: Rated for a maximum working pressure of up to 175 PSI and handles operational fluid temperatures ranging from 33°F to 140°F.
• Positive Shut-Off: Integrated FxG OS&Y gate valves permit routine maintenance and servicing without shutting down the entire water distribution system.

Technical Specifications & Compliance Table

Submittal & Installation Note: Contractors must verify local Authority Having Jurisdiction (AHJ) cross-connection control requirements and consult the manufacturer technical data sheet prior to installation. Note that this specialized commercial assembly is non-refundable and non-cancellable.

Documentation: Download Manufacturer Technical Data & Cut Sheet (PDF)