4" Double Check Detector Valve with OSY Backflow Preventer

The 4" Double Check Detector Valve with OSY Backflow Preventer is a specialized valve designed for commercial and industrial fire protection systems. It combines backflow prevention with flow detection, ensuring both water safety and system integrity while providing clear, manual operation feedback.

• Material Construction: Corrosion-resistant metal body with internal components made from stainless steel and bronze alloys to resist degradation from potable and fire service water exposure.
• Valve Design: Features dual spring-loaded check valves paired with a test bypass assembly to detect unauthorized flow and prevent backflow contamination.
• OS&Y Mechanism: Equipped with an Outside Screw and Yoke design that includes a rising stem, making valve position visually obvious during inspections for easier maintenance checks.
• Size and Pressure Rating: Suitable for 4" nominal pipe size applications, supporting system pressures up to 175 PSI, accommodating high flow rates common in fire sprinkler systems.
• Compliance Standards: Meets UL 1476, FM approval, and NFPA 13 and NFPA 25 requirements, ensuring it adheres to fire protection codes for installation, testing, and maintenance.
• Connection Compatibility: Designed to integrate seamlessly with standard grooved or flanged piping, simplifying installation within existing fire protection infrastructure.

This valve provides a reliable solution for facilities needing to prevent contaminated water from flowing back into the potable supply while simultaneously monitoring for unexpected water movement that may signal leaks or unauthorized usage. The visible valve position via the OS&Y mechanism aids maintenance teams in quickly confirming operational status, reducing downtime risks. Integrating backflow prevention and flow detection in a single device streamlines system design and preserves compliance with municipal and fire safety regulations, making it a practical choice for ensuring water safety and fire system functionality.