... valves, retarding chamber,etc Wet Alarm Valve Wet automatic water spraying system is one of most widely used fixed ... composed of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow indicator, water supply network, closed fire sprinkler, alarm ... area, temperature rises up, pressed water jet from sprayer and, the alarm valve is initiated to jet water onto fire. After 5-20 ...