Watts 0386423 Valve

The Watts 0386423 (Series B1156F) is a high-capacity boiler feed water pressure regulator engineered for demanding hydronic heating applications. Built with a heavy-duty bronze body and 1/2" FNPT threaded connections, this valve is designed to automatically fill the boiler and system piping while maintaining a constant system pressure. It provides essential make-up water to compensate for system leaks, ensuring the loop remains pressurized and functional. This unit features an integrated stainless steel strainer to protect the valve disc from fouling and a tight seating check valve to prevent backflow into the supply line. With a factory setting of 15 PSI and an adjustable range of 10-25 PSI, it offers the flexibility needed for various residential and commercial multi-story layouts. The built-in manual purge lever allows for rapid filling and air purging, making it a reliable standard for technicians looking for simplified servicing and high-flow performance.

• High-Capacity Performance: Optimized for rapid system filling and maintaining stable pressure in larger hydronic loops.
• Debris Protection: The internal stainless steel strainer prevents sediment and pipe scale from compromising the valve seat.
• Field-Serviceable Design: Features unitized construction for easy maintenance and accessibility without removing the valve from the line.
• Manual Purge Lever: Simplifies the air-bleeding process and allows for fast-fill operations during initial system startup.
• Durable Bronze Construction: Provides superior corrosion resistance and longevity in non-potable heating environments.

How do I adjust the system pressure on this valve?
To adjust the Watts B1156F, remove the fast-fill lever cap and loosen the lock nut. Turn the adjusting screw clockwise to increase pressure or counter-clockwise to decrease it, monitoring the boiler gauge until your target (standardly 12-15 PSI) is reached.

Is this regulator suitable for potable water systems?
No, the 0386423 is designed strictly for non-potable hydronic heating systems. It does not meet low-lead requirements for drinking water applications.

Where should this valve be installed in the system?
It must be installed on the cold water supply line to the boiler. A shutoff valve and a backflow preventer (like a Watts 9D) should be installed upstream to comply with local mechanical codes.

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.