Watts 0121494 Relief Valve

The Watts 0121494, also identified as the LF174A-1-75, is a high-capacity pressure relief valve designed specifically for hot water heating boilers and hydronic heating systems. Featuring a 1-inch female NPT inlet and outlet, this Lead Free copper silicon alloy valve provides robust protection against over-pressure conditions with a factory-set relief pressure of 75 PSI. With a massive steam discharge capacity of 2,055,000 BTU/hr, it is engineered for large-scale residential or light commercial applications where high-output boilers are utilized. The Watts LF174A series utilizes a non-mechanical, fail-safe design with a stainless steel spring and EPDM rubber disc to ensure positive shut-off and reliable reseating after discharge. This ASME Section IV certified valve is a direct replacement for non-lead free 174A models, maintaining the exact same physical envelope and performance specs while meeting modern potable water safety standards.

• High BTU Rating: Rated at 2,055,000 BTU/hr to handle high-output boiler systems without bottlenecking.
• Lead Free Construction: Features a Lead Free copper silicon alloy body for compliance with safe drinking water regulations and superior corrosion resistance.
• Precise Pressure Control: Pre-set at 75 PSI to protect sensitive boiler heat exchangers and hydronic piping from structural failure.
• Contractor Grade Durability: Equipped with a heavy-duty stainless steel spring and a high-temperature EPDM seat for a leak-free seal and long-term service life.

Is the Watts 0121494 a direct replacement for the 174A-1-75?
Yes, the 0121494 is the exact Lead Free equivalent to the older 174A-1-75. It shares the same 1-inch NPT connections and 75 PSI relief setting, making it a drop-in replacement for existing hydronic systems.

What is the maximum BTU capacity for this relief valve?
The Watts LF174A-1-75 is rated for a steam pressure discharge capacity of 2,055,000 BTU/hr, making it suitable for larger boilers requiring high-volume safety relief.

Can this valve be mounted horizontally?
For proper operation and to prevent debris buildup on the seat, it is standard practice to install Watts relief valves in a vertical position with the discharge pipe directed downward to an appropriate drain.

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.