... motor gong,short pipes,ball valves, retarding chamber,etc Wet Alarm Valve Wet automatic water spraying system is one of most widely ... and automatic fire extinguishing. It is composed of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow indicator, water ... temperature rises up, pressed water jet from sprayer and, the alarm valve is initiated to jet water onto fire. After 5-20 ...