This 4 inch Lead Free Reduced Pressure Detector Backflow Preventer Assembly with OSY Shutoff Valves and a Gallons/Minute Meter is designed to protect potable water systems from contamination due to backsiphonage and backpressure, in accordance with national plumbing codes.

It is commonly used in health hazard applications, such as on fire sprinkler systems, and to monitor unauthorized water use or detect leakage.

Construction & Design

• Features a 304 (Schedule 40) stainless steel housing and sleeve for durability.
• Utilizes two independent torsion spring check modules and a differential pressure relief valve.
• Includes UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
• The assembly is extremely compact and approximately 70% lighter than traditional designs.
• Approved for horizontal Z-pattern installation.
• Equipped with groove fittings for integral pipeline adjustment and ease of serviceability.

Performance & Features

• The patented torsion spring check design ensures the lowest pressure loss and drip-tight closure against reverse flow.
• A gallons per minute meter is furnished to detect underground leaks and unauthorized water usage from the fire sprinkler system.
• Includes a flood sensor on the relief valve to detect excessive water discharges, providing an alert for facility personnel. An add-on connection kit is required to activate the flood sensor's communication features; without it, the sensor is passive.
• Lead Free* construction ensures the wetted surface contains less than 0.25% of lead by weight.
• Features reversible elastomer check discs for extended service life.