Watts 174A-1 Boiler Pressure Relief Valve

Watts 174A-1 Boiler Pressure Relief Valve is a lever-type safety valve that protects hot water heating boilers from dangerous pressure buildup. Built with a bronze body and a stainless steel spring, this valve delivers durable, dependable operation and easy manual testing with a standard test lever. The unit supports a set pressure range of 30–150 psi and withstands temperatures up to 250°F, making it suitable for both residential and commercial hot water heating systems. Its compact 4-1/4" W x 8-1/2" H profile provides versatile installation in tight boiler rooms.

• Inlet/Outlet Size: 1-1/4 Inch, female threaded x female threaded end connections
• Materials: Bronze body, stainless steel spring, metal seat, non-metallic disc
• Set Pressure & Temp: 30–150 psi; 250°F maximum temperature
• Application: Hot water heating boiler protection
• Standards: ASME, NB, HV, MIL-V-18634B, Type I, Class 3A, Style A
• Capacity: 1,682,000 to 6,340,000 BTU/hour
• Features: Seat located above drain; test lever
• Dimensions: 4-1/4" W × 8-1/2" H

Designed for reliable boiler safety, the Watts 174A-1 meets essential standards while delivering straightforward installation and long-lasting performance in hot water heating systems.