Watts 174A-3/4-125 Boiler Pressure Relief Valve

Watts 174A-3/4-125 Boiler Pressure Relief Valve delivers reliable overpressure protection for hot water heating boilers. This lever-type relief valve protects equipment and occupants by venting excess pressure at a set 125 PSI.

Built with a bronze body and stainless steel spring, it features a metal seat and a non-metallic disc for durable operation. The valve inlet and outlet are both 3/4 inch female threaded connections, and the end connections are female threaded x female threaded, designed for straightforward installation on standard piping. The unit covers a broad operating range from 30 to 150 PSI and is rated for up to 250°F, making it suitable for many hot water boiler applications. It complies with ASME, NB, HV, and MIL-V-18634B Type I Class 3A Style A standards, ensuring safety and compatibility.

Engineered for easy retrofit and dependable long-term service, this Watts relief valve delivers consistent performance at its 125 PSI set point, helping to minimize boiler stress and water hammer risks. Built with a bronze body and stainless steel spring, it resists corrosion in hot water applications and maintains reliable operation across temperature ranges up to 250°F. The non-metallic disc to metal seat design reduces wear, while the test lever enables quick testing during maintenance.

• Type: Lever
• Set pressure: 125 PSI
• Inlet/Outlet: 3/4" female threaded
• End connections: female threaded x female threaded
• Body material: Bronze
• Spring material: Stainless steel
• Seat: Metal; Disc: Non-Metallic
• Temperature rating: 250°F
• Pressure range: 30–150 PSI
• Applications: Hot water heating boiler
• Standards: ASME, NB, HV, MIL-V-18634B Type I Class 3A Style A
• Capacity: 650,000 to 2,445,000 BTU/hour
• Dimensions: 2-3/4" W x 4-1/2" H
• Includes: Test lever; Seat located above drain