Watts 174A-075 Bronze Boiler Pressure Relief Valve

Watts 174A-075 Bronze Boiler Pressure Relief Valve is a 3/4-inch bronze emergency relief valve designed to protect hot water heating boilers and domestic hot water systems from excessive pressure. It features 3/4-inch female NPT inlet and outlet connections, a stainless steel spring, and a non-metallic disc-to-metal seating, with a test lever to facilitate verification. The valve automatically opens at a set point of 75 PSI and reseats after the pressure returns to a safe level, providing automatic overpressure protection. It is intended for emergency relief rather than as an operating control. Common applications include hot water heating boilers, hydronic systems, domestic hot water supply boilers, as well as commercial heating equipment, institutional facilities, industrial boiler systems, mechanical rooms, and process heating applications requiring automatic overpressure protection to safeguard boilers, piping, and equipment. Technical specifications: Manufacturer Watts Water Technologies; Model 174A-075 3/4; Ordering Code 0274598; Series 174A; Inlet/Outlet: Female NPT; Body Material: Bronze; Pressure Relief Setting: 75 PSI; Pressure Range: 30–150 PSI; Maximum Working Pressure: 56 PSI; Seat Design: Non-Metallic Disc-to-Metal Seating; Spring Material: Stainless Steel; Test Lever: Yes; Operation: Automatic Reseating; Function: Boiler Overpressure Protection; Application Type: Hot Water Heating and Domestic Supply Boilers. Common Replacements: Watts 174A 075 FS 3/4 Pressure Relief Valve; Watts LF174A-075 3/4 Lead-Free Pressure Relief Valve; Apollo 10-400 Series Boiler Pressure Relief Valve.