FM Approval Wet Alarm Valve

Working principle of alarm valve group
The working principle of the alarm valve group  varies according to different types. Taking the wet alarm valve as an example, its working principle is as follows: 

Quasi-working state: The wet alarm valve device is in a responsive state for a long time, and the system side is filled with water under working pressure. The water filling pressure in the pipeline is maintained by pressure stabilizing facilities such as fire water tanks, pressure stabilizing pumps, and pneumatic water supply equipment.

Fire outbreak: Under the action of fire temperature, the heat-sensitive element of the closed sprinkler head moves, and the sprinkler head opens and starts spraying water. At this time, the water in the firewall changes from static to flowing, and the water flow indicator moves to send an electrical signal, which displays the information of water spraying in a certain area on the fire alarm controller.

Pressure change: Due to continuous water spraying and pressure relief, the upper water pressure of the wet alarm valve is lower than the lower water pressure. Under the action of the pressure difference, the wet alarm valve that was originally closed automatically opens. At this time, the pressurized water flows to the power supply through the wet alarm valve, and at the same time the channel to the hydraulic alarm bell is opened.

Alarm sounds: After the delayer is filled with water, the hydraulic alarm bell sounds an audible alarm. The flow switch of the high-level fire water tank or the pressure switch of the system official website acts and outputs a signal to directly start the water supply pump.

System startup: After the water supply pump is put into operation, the system startup process is completed.