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