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