300psi(20,6bar)Y-4015 Type 
Nominal Pressure TS EN 12259-3 Standards EN-1092-2 PN16 Flange connection standard TS EN 12259-3/UL 260/FM 1021 Tests
Dry Alarm Valve
Dry Pipe Sprinkler Systems are designed for applications where piping and sprinklers are subjected to freezing temperatures, such as unheated warehouses, parking garages, store windows, attic spaces, or loading docks.
The sprinkler system contains gas instead of water. The dry pipe valve with a special clapper keeps the pressure water by low air pressure. In case of fire, the sprinkler activated and the differential of the system is breaking down and it causing to open clapper. After the sprinkler is activated by the fire the air in the sprinkler system is discharged from the sprinkler system. The water is sent to the location of the fire. By the time the clapper opens the water also is sent to the pressure switch and the switch sends alarm information to the fire warning system or automation system. After the switch is activated, the water is delivered to the water-motor gong and releases a mechanical alarm.