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The NABIC 500 high lift safety valve is designed for unvented hot water heating systems requiring high-capacity emergency steam relief. All wetted parts are made from dezincification-resistant materials, ensuring durability. It complies with BS EN ISO 4126-1 and is WRAS approved. The valve features a resilient PTFE seating design for excellent seat tightness and a locked, sealed pressure setting. It allows for easy inspection and cleaning, boasts high discharge capacity, and has diaphragm-protected parts. Available in sizes 1/2 x 3/4 inch, the valve includes a packlock option that complies with M&E3 and is available with a Viton seat design. Ideal for maintaining safety on heating systems operating at 1 bar and above.. Nabic 1/2 inch 500 High Lift Safety Valve - 3.5 Bar Brass N-500-015-3.5