Watts 0391009 Ball Valve

The Watts 0391009 is a 1-inch Lead Free LF909-QT reduced pressure zone (RPZ) backflow preventer assembly, designed to provide high-hazard protection against backsiphonage and backpressure in potable water systems. This model serves as the direct replacement for the older 909QT-1 series, featuring a modular check valve design for streamlined field maintenance. The integrated 1/4 turn ball valves provide reliable shut-off capability and easy testing access. Engineered for high-hazard cross-connection control, this assembly utilizes a pressure differential relief valve and independent check modules to ensure maximum system safety. The LF909-QT design is built with a heavy-duty bronze body that meets all current NSF/ANSI 61 and 372 standards for lead-free compliance. Professional installers prefer this series for its reputation in industrial backflow prevention and commercial plumbing applications due to its consistent hydraulic performance and low-pressure drop characteristics.

Key Benefits:

• Lead Free Construction: Complies with low-lead mandates for potable water service in all commercial and residential sectors.
• Simplified Maintenance: Modular check valves allow for seat replacement and cleaning without specialized tools or removing the body from the line.
• Quarter-Turn Operation: Full-port, bronze ball valve shut-offs allow for rapid isolation during mandatory annual testing.
• Interchangeability: Serves as the updated 0391009 replacement for legacy 909QT-1 installations, ensuring footprint compatibility.

Common Questions:

• Is this model compatible with original 909 series repair kits? Yes, the internal check valve modules and relief valve rubber parts are compatible with equivalent sized 909/LF909 series components.
• What is the maximum operating pressure? This assembly is rated for a working pressure of up to 175 psi (12.1 bar) and temperatures up to 140°F (60°C).
• Can this be installed vertically? The LF909-QT is specifically designed for horizontal installation to ensure the relief valve functions correctly and clears the air gap drain.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.