... motor gong,short pipes,ball valves, retarding chamber,etc Wet Alarm Valve Wet automatic water spraying system is one of most widely ... is composed of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow indicator, water supply network, closed fire sprinkler ... signal to ring the bell for fire extinguishing. All ZSFZ wet alarm valves of us have been tested to be qualified ...