Watts 174A-3/4-50 Boiler Pressure Relief Valve

The Watts 174A-3/4-50 Boiler Pressure Relief Valve is a reliable boiler safety valve designed for hot water heating boilers. This lever-type relief valve protects your system from overpressure with a robust bronze body, stainless steel spring, and a metal seat paired with a non-metallic disc for dependable performance.

Designed for 3/4 inch connections, this valve features female threaded end connections on both inlet and outlet, a 50 psi set pressure, and a temperature rating of 250°F. It accommodates a working pressure range of 30–150 psi and is built to ASME, NB, HV, MIL-V-18634B Type I Class 3A Style A standards for safe, compliant operation. Ideal for residential or commercial hot water heating boilers, it delivers durable, long-lasting protection.

• Set pressure: 50 psi
• Pressure rating: 30–150 psi
• Inlet/Outlet: 3/4 inch, female threaded x female threaded
• Body material: Bronze; Seat material: Metal; Disc material: Non-metallic; Spring material: Stainless steel
• Temperature rating: 250°F
• Applications: Hot water heating boiler
• Inclusions: Seat located above drain; Test lever; Non-metallic disc to metal seat
• Capacity: 650,000 to 2,445,000 BTU/hour
• Standards: ASME, NB, HV, MIL-V-18634B Type I Class 3A Style A
• Dimensions: 2-3/4" W x 4-1/2" H