Wet alarm valve inlcuding pressure gauge,water motor gong,short pipes,ball valves, retarding chamber,etc Wet Alarm Valve Wet automatic water ... automatic fire extinguishing. It is composed of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow ... can just install it according to the height of valve and the flange connecting size. Technical ParameterModelNominal Diameter (mm ...