... pressure gauge,water motor gong,short pipes,ball valves, retarding chamber,etc Wet Alarm Valve Wet automatic water spraying system ... of ZSFZ wet alarm valve, water motor gong, retarder, pressure switch, water flow indicator, water supply network, closed fire sprinkler, alarm control device ... rises up, pressed water jet from sprayer and, the alarm valve is initiated to jet water onto fire. After 5 ...