This 1 IN boiler pressure relief valve is used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 100 PSI (689.5 KPA) with corresponding high pressure ratings up to 2635000 BTU/HR.

Boiler Water Pressure Relief Valve, Series/Model: Series 174A/M1, Nominal Size: 1 IN, Connection Type: Female, Pressure Rating: 100 PSI, Temperature Rating: 250 DEG F, Bronze Body Material, Test Lever Handle Operator Type, Handle Material: Stainless Steel, Industry Standards: Tested And Rated By The National Board of Boiler And Pressure Vessel Inspectors To The Requirement Of ASME, Meets Military Spec. MIL-V-18634B, Type I, Class 3A, Style A, 3 IN Width, 5-3/4 IN Height, Lead Free: No, Additional Specifications: Steam Pressure Discharge Capacity: 2635000 BTU/HR

• Automatic reseating
• Bronze body
• Spring loaded
• Soft seated

• Warranty Information https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/Watts_0009108_Warranty_Information.pdf
• Instruction/Installation Manual https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/Watts_0274428_Instruction_Installation_Manual.pdf
• Specification Sheet https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/Watts_0274428_Specification_Sheet.pdf