Watts Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy
The WATTS Relief Valve (MPN 1-1/4 LF174A 150 FS) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, sized 1 1/4 in x 1 1/4 in in a Copper Silicon Alloy construction and an overall…
SKU 3G-OTH-442492
Need installation or engineering help?
Ask a question
Product Description
The WATTS Relief Valve (MPN 1-1/4 LF174A 150 FS) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, sized 1 1/4 in x 1 1/4 in in a Copper Silicon Alloy construction and an overall height of 8 1/2 in. 3G Electric interprets customer demand and delivers this genuine industrial component across 14 departments — with specialist depth in combustion, pumps and controls — ensuring you get the right answer, not just a catalog.
Frequently Asked Questions
What is the Watts LF174A relief valve used for?
The Watts LF174A is an ASME Section XIII hot water pressure relief valve used in commercial and industrial hydronic heating systems. It protects boilers and water heaters from overpressure by automatically discharging water when pressure exceeds the set limit, ensuring safe operation.
What are the specifications of the Watts 1-1/4 LF174A 150 FS relief valve?
This Watts relief valve has 1 1/4 in FNPTF x FNPTF connections, a copper silicon alloy body, and an overall height of 8 1/2 in. The manufacturer part number is 1-1/4 LF174A 150 FS. It is designed for ASME Section XIII hot water pressure relief applications.
Where to buy Watts relief valves worldwide?
3G Electric supplies Watts relief valves worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us to source the Watts 1-1/4 LF174A 150 FS or other models for your project.
How to install a Watts LF174A relief valve?
Install the Watts LF174A in the boiler or water heater tapping with the sensing element immersed in water. Use pipe dope on male threads, avoid overtightening, and route the discharge pipe downward to a safe drain. Follow local codes and the manufacturer's instructions for proper operation.
Used in
Common applications for WattsWatts Products
3G Electric supplies Watts asme section xiii hot water pressure relief valves. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















