DOUBLE INTERLOCK, PREACTION SYSTEM - HD Fire

Valve from the system air pressure. Riser Check Valve provides an air check so that the system can be automatically pressurized with a supervisory air or nitrogen pressure of 42 PSI (2.94 Bar). A supervisory low pressure alarm switch can be set at 20 PSI (1.40 Bar), on decreasing pressure, to indicate whether

  System, Switch, Pressure, Supervisory, Double, Interlock, Copertina, Double interlock, Preaction system