... inlcuding pressure gauge,water motor gong,short pipes,ball valves, retarding chamber,etc Wet Alarm Valve Wet automatic water ... composed of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow indicator, water supply network, closed fire sprinkler, ... connecting size. Technical ParameterModelNominal Diameter (mm)Max Working Pressure (Mpa)External Diameter of Flange (*B mm)Middle ...