Potter Releasing Systems - Manual (Page 24)

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B. Wet System With Alarm Check Valve And Maintained Excess Pressure
A pressure type flow switch is connected to the alarm port of the alarm check valve.
Activation of a sprinkler head in the system results in a loss of excess pressure, this allows the alarm check valve to
open. When the valve opens, the alarm port is exposed to the incoming water supply. The waterflow pressure switch
detects this increase in pressure and sends an alarm signal when the pressure in the alarm line reaches 6 psi.
Note: All water control valves shall be supervised per NFPA13 2010 8.16.1.1.2.1.