Watts 0386425 Regulator

The Watts 0386425 (Series 1156F) is a high-capacity boiler feed water pressure regulator designed for reliable performance in both residential and commercial hydronic heating systems. Featuring a rugged iron body construction with 1/2-inch FNPT threaded connections, this valve is engineered to automatically fill the boiler and system piping while maintaining consistent pressure levels. The integrated stainless steel strainer protects the internal disc from fouling due to system scale or debris, while the tight seating check valve prevents backflow. A standout feature for technicians is the manual purge lever, which facilitates rapid system filling and simplifies air purging during initial commissioning or maintenance cycles. Capable of handling a maximum inlet pressure of 100 PSI and fluid temperatures up to 212°F, the Watts 1156F is a industry-standard component for ensuring hydronic system pressure stability and providing necessary make-up water in the event of minor system leaks.

• Simplified Servicing: Features a unitized design that allows for easy maintenance without removing the valve body from the line.
• High Flow Capacity: Engineered for rapid filling and sustained flow, significantly reducing the time required for system startup.
• Integrated Protection: Includes a built-in stainless steel strainer and a high-performance check valve to ensure long-term reliability.
• Versatile Installation: Suitable for both vertical and horizontal mounting configurations on the cold water supply line.

How do I adjust the outlet pressure on the 1156F?
To adjust the reduced pressure, remove the fast fill lever cap and loosen the lock nut. Turning the adjusting screw clockwise raises the pressure, while counter-clockwise lowers it. The factory setting is 15 PSI, but it is adjustable between 10 and 25 PSI.

Can I use this regulator for potable water systems?
No. The Watts 0386425 is constructed from cast iron and is intended specifically for non-potable hydronic heating applications. It does not meet low-lead requirements for drinking water.

What is the purpose of the purge lever?
The purge lever (also called a fast-fill lever) manually forces the valve into a wide-open position. This bypasses the pressure setting to allow for maximum flow when purging air from the loops or filling the system for the first time.

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.