A high capacity pressure relief valve to protect closed-circuit water heating systems from overpressure, made from hot pressed brass. The outlet is one size larger than the inlet to ensure high discharge flow rates. It has a separate seal seating from the diaphragm with a cover which is made from OT58 brass. Available in a variety of sizes to suit most installations, it also has a pressure range from 2.5 bar to 5.0 bar with the response pressure indicated on the twist cap. The valve size is determined by the heat output of the boiler as shown in the maximum heating capacity table on page 2. FEATURES AND BENEFITS • The outlet is one size larger than the inlet, for high capacity discharge • Provides protection against overpressurisation in wet heating systems • Diaphragm design gives improved resistance against scale • Cartridge design gives ease of service and replacement without the need to re-set the response pressure • Set pressure range from 2.5 bar to 5.0 bar to suit any system
