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The NABIC 500 high lift safety valve is ideal for unvented hot water heating systems, needing high capacity emergency steam relief. Wetted parts are made from dezincification-resistant materials. It complies with BS EN ISO 4126-1 and WRAS standards. The valve features a resilient PTFE seating design ensuring high seat tightness. It offers a locked and sealed pressure setting. The valve allows for easy inspection and cleaning, featuring high discharge capacity and diaphragm-protected parts. Compliant with M&E3, it can be padlocked and is available with a Viton seat design. Suitable for unvented systems, the Nabic 1 inch 500 High Lift Safety Valve operates at 2.5 bar.. Nabic 1 inch 500 High Lift Safety Valve - 2.5 Bar Brass N-500-025-2.5