ZSFW model deluge alarm valve adopted the principle of diagragm and non-return, when the pipeline pressure which around diaphragm reach to balance, diaphragm will be in a closed position, when water s
ZSFZ Fire Alarm System Wet Alarm Valve is a commom regular extinguishing system.It is ccomposed of wet alarm valve,retarder,water motor alarm and other parts(such as,pressure switch,water flow detecto
