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