Alarm valve is connected to automatic sprinkler system, or cut off water, and start the alarm device. In the automatic sprinkler system, alarm valve is a critical component, and its role to three factors: connect or disconnect the water supply, the output alarm signal and the prevention of water pumped back into the water supply source, and through the alarm valve can be installed on the system's water supply and alarm devices tested. Alarm valve according to the system were divided into wet alarm valves, dry-type alarm valve and the deluge valve.
1. Wet alarm valve for wet sprinkler systems. Its main function is: When the nozzle is turned on, wet valve automatically opens, and make water flows into the hydraulic alarm bell triggering an alarm.
2. Dry-type alarm valve for dry-type sprinkler system. It will be the valve flap valve into two parts, the export side with the system piping and the nozzle connected to the compressed air inside the filling, import side and water connected. Dry-type valves use air pressure and water pressure acting on both sides of the flap valve torque difference control valve on the valve closed and open, generally can be divided into differential-type dry-type alarm valve and sealed dry-type alarm valve two kinds of.
3. Deluge valve for the rain sprinkler systems, pre-action sprinkler systems, water systems and water spray curtain destroy the system. The import side of this valve and water connected to the export side connected with the system piping and nozzles, usually air traffic control, only the role of the system in the pre-inflated. Deluge valve opening control by a variety of fire detection devices.
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