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LF174A Watts

Lead Free* Boiler Pressure Relief Valves

Model LF174A Boiler Pressure Relief Valves are Lead Free* cast copper silicon alloy body safety relief valves for pressure protection only of all types of hot water heating boiler equipment. Pressure range is 50 to 150psi (3 - 10 bar) with corresponding high ratings from 2,459,000 to 14,370,000 BTU/hr. Female inlet and outlet connections. Sizes: 3/4in. - 2in. (20 - 50mm). The LF174A features Lead Free* construction to comply with Lead Free* installation requirements. It resists corrosive water conditions, sticking, and freezing, and it prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and shall not be used as an operating control.


  • Lead Free* cast copper silicon alloy body
  • Non-mechanical seat-to-disc alignment will not stick or freeze
  • Seat is located above drain to prevent water from being trapped and sediment from fouling the seat
  • Valve protects hot water heating boiler equipment from excessive pressure

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF174A