Taco 329-T3 Cast Iron Boiler Feed Valve — 1/2 in FPT, Adjustable 10-25 PSI

Overview

The Taco 329-T3 is a robust cast iron boiler feed valve designed to automatically feed water to a heating system whenever system pressure falls below the set point. With 1/2 inch threaded inlets, it provides a compact, durable connection suitable for a wide range of boiler configurations.

How it works

When system pressure drops, the valve opens to admit fresh water, helping maintain prime and stable operation of boilers during startup or periods of higher demand. The result is a steadier pressure profile with less manual intervention during routine operation.

Key features

• Adjustable from 10 to 25 PSI
• Built-in check prevents emptying the system if incoming pressure fails
• Fast fill rates for quick response to pressure changes
• Exclusive lockable fast-fill lever for secure operation

Practical scenarios

In residential or light commercial boiler loops, this valve helps keep the system primed as outdoor temperatures shift or during cold starts. The durable cast iron body supports long life in demanding environments, and the 1/2 inch FPT connections offer straightforward installation with compatible piping. These advantages translate into steadier pressure and fewer manual top-offs during routine maintenance, though results may vary by system.

Additional considerations

Some Dual Control variants pair boiler feed with an inline pressure relief valve for added safety and convenience in larger or more complex setups.

Summary of benefits

• Automatic water feeding maintains pressure without constant monitoring
• Adjustable setpoint lets you tailor performance to your system
• Protects against accidental emptying if supply pressure fluctuates
• Fast-fill capability supports rapid recovery after pressure dips