Watts Series LF174A Boiler Pressure Relief Valves

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 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 conditions, sticking and freezing, and 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.

This 0121479 3/4 inch boiler pressure relief valve consists of a lead free 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. 

Features:

• Seat located above drain; water cannot be trapped and sediment cannot foul seat
• Non-mechanical seat-to-disc alignment will not stick or freeze
• Water seal of high temperature resisting material isolates spring working parts from water during relief