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