Mcdonnell & Miller 260-1-1/2-45, Relief Valve 1-1/2" NPT, 45 psi (3.2 kg/cm2)

For water tanks and hydronic heating systems Specifications Protects against over-pressure Minimizes hammering with flash steam Low differential pressure - 3 psi (.21 kg/cm2) between opening and closing Meets ASME Pressure Vessel and Boiler Code, Section IV Sealed spring chamber prevents scale or sediment build-up around seal 1-1/2" NPT Inlet and 2" NPT Discharge Cast iron body, brass seat Maximum temperature 250 Deg. F (121 Deg. C) Maximum operating pressure range 30 - 50 psig (2.1 - 3.5 kg/cm2)