Watts 0386462 Regulator

The Watts 0386462 (Model 1/2 B911S-M3) is a dual-function pre-assembled unit engineered for high-performance hydronic heating systems. By combining the 9D series backflow preventer and the 1156F feed water pressure regulator into a single bronze body, this assembly streamlines installation while ensuring system safety. The bronze combination fill valve is specifically designed for commercial and residential hydronic boiler feed lines, providing automated makeup water to maintain consistent system pressure. Featuring a 1/2 inch union solder inlet and an NPT threaded outlet, it supports rapid system filling through its high capacity fill mechanism. This unit is factory set at 15 psi with an adjustable range of 10-25 psi, capable of handling a maximum working pressure of 100 psi and temperatures up to 212°F. The integrated dual check with atmospheric vent offers reliable protection against backpressure and backsiphonage, critical for maintaining the integrity of the potable water supply in any boiler make-up application.

• Dual-Action Protection: Combines a water pressure regulator and backflow preventer to simplify piping and reduce leak points.
• High-Capacity Filling: Features a fast fill and purge lever for rapid air removal and initial system charging.
• Serviceable Construction: All-bronze body and union solder x NPT connections allow for easier maintenance and component replacement in tight mechanical rooms.
• Industry Compliance: Engineered to meet standard boiler feed valve requirements for residential and commercial heating.

• Can I adjust the pressure on the 1156F regulator? Yes, while factory set at 15 psi, the regulator is adjustable between 10 and 25 psi to meet the static head requirements of different building heights.
• Is this unit suitable for potable water applications? This valve is intended for boiler feed lines; while it protects potable water from backflow, it is not "lead-free" for use in domestic drinking water systems.
• What happens if the atmospheric vent drips? A dripping vent usually indicates the presence of debris in the 9D backflow preventer check seats or a pressure imbalance requiring maintenance of the internal discs.

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.