Watts 174A-3/4-150 Boiler Pressure Relief Valve

Watts 174A-3/4-150 Boiler Pressure Relief Valve provides essential overpressure protection for hot water boilers. This lever-operated valve pairs a bronze body with a stainless steel spring to deliver reliable performance at a set pressure of 150 PSI.

Its 3/4 inch inlet and 3/4 inch outlet feature female threaded end connections for straightforward installation on standard hot water heating boiler lines. The valve uses a metal seat with a non-metallic disc for durable sealing, and the seat is located above the drain for safe discharge. Rated for temperatures up to 250°F and designed for system pressures from 30 to 150 PSI, it complies with ASME, NB, HV, MIL-V-18634B Type I, Class 3A, Style A standards.

• Inlet size: 3/4 in
• Outlet size: 3/4 in
• End connections: Female threaded x Female threaded
• Body material: Bronze; Spring material: Stainless steel
• Seat material: Metal; Disc material: Non-metallic
• Set pressure: 150 PSI; Temperature rating: 250°F
• Pressure rating: 30–150 PSI
• Includes: Test lever; Seat located above drain
• Application: Hot water heating boiler
• Capacity: 650,000 to 2,445,000 BTU/hour
• Dimensions: 2-3/4" W x 4-1/2" H
• Standards: ASME, NB, HV, MIL-V-18634B Type I, Class 3A, Style A