4" Double Check Assembly OSY Valve Fire Protection Backflow Preventor Valve

Protect your water supply and fire safety infrastructure with the Ames Backflows 4" Double Check Assembly with OS&Y Valve. This essential component is engineered for commercial and residential fire protection systems to prevent backflow contamination.

Engineered to meet fire safety regulations and plumbing codes for building inspection approvals, this assembly satisfies backflow prevention standards mandated under regional plumbing and fire protection frameworks like NFPA 13 and NFPA 25 for system integrity and periodic testing. The integrated Outside Screw and Yoke design provides a clear visual indication of the open or closed position for manual control, allowing for a quick, confident closure during maintenance or emergencies.

Key Features & Construction

• Durable Construction: Crafted from high-grade materials to withstand high pressure and harsh environmental factors on the job site.
• Integrated OS&Y Valve: Features an Outside Screw and Yoke design providing a clear visual indication of open or closed positions.
• 4-Inch Sizing: Designed with a 4-inch inlet and outlet to manage substantial flow rates required by modern fire protection systems.
• Advanced Double Check Mechanism: Incorporates two independent, resilient-seated check valves to safeguard potable water supplies.
• Streamlined Maintenance Design: Allows for straightforward, in-place inspection and servicing to reduce downtime and lower maintenance costs.

Technical Specifications & Compliance Table

Verify local Authority Having Jurisdiction (AHJ) requirements and consult manufacturer technical data sheets before installation. Please note that this product is non-refundable and non-cancellable.

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