Alarm Check Valve
The alarm check valve is an important part of the automatic sprinkler system. It is a one-way valve that only allow water to flow into the system side. When a fire occurs, the closed fire sprinkler head is automatically opened after being heated, the water pressure in the system side reduce, the alarm check valve opens automatically and the hydraulic bell is driven under the specified pressure and flow to make a sound alarm. The pressure switch interlocks and starts the fire pump to supply water to the pipeline and sends an alarm signal to the control center.