Preaction Alarm Valves It's used in the library,archives,storage,computer room,freezer room,etc. We make different kinds of Alarm Valves & Alarm System, etc.1.Item No.: ZSFG100, ZSFG150 ZSFG2002.nominal working pressure: 1.2Mpa3. Strength test pressure: 4.8Mpa3. Flux(l/min): 15s Preaction Alarm Valves