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This NABIC 500 high lift safety valve has been designed primarily for use on unvented hot water heating systems where a high capacity, emergency steam relief capability is required. All wetted parts are manufactured from dezincification resistance materials. Designed and tested to BS EN ISO 4126-1 and WRAS approved (1 bar and above), this safety valve is available in a wide range of sizes and has a resilient PTFE seating design with a high degree of seat tightness. Ensuring easy inspection and cleaning, it has diaphragm-protected parts and a locked and sealed pressure seating. Features & Benefits: Nabic 1 1/2 inch 500 High Lift Safety Valve - 5.7 Bar, Resilient PTFE seating design, Easy inspection and cleaning, High discharge capacity, Diaphragm protected parts, Pressure setting locked and sealed, Drain plug fitted, 1 x 2, For use on unvented hot water heating systems, Available with Viton seat design, Padlock available (complies with M&E3). Nabic 1 1/2 inch 500 High Lift Safety Valve - 5.7 Bar Brass N-500-040-5.7