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 Alarm Check Valves
Model NX009 Alarm Check Valve is a wet pipe sprinkler system water supply check valve that marks possible the installation of sprinkler systems in buildings not subject to freezing temperatures. It is designed so that water pressure in the piping system will hold back water pressure at the valve until a significant flow of water occurs.

  • The Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reserse flow from sprinkler piping.
  • The valve is trimmed with a water bypass line. The bypass line allows pressure surges to enter the system and to be trapped above the alarm check valve's clapper without the clapper lifting and causing false alarms.
  • When a significant sustained flow of water occurs, such as from an open sprinkler, the alarm valve's clapper lifts and allows water to enter the system. Simultaneously, water enters an intermediate chamber, which allows the water to activate an alarm either through an optional water motor alarm and /or through a water pressure alarm. These alarms continue to sound until the flow of water is stopped.
  • The NX009 Alarm Check Valve shouls be installed vertically on wet-pipe sprinkler systems with constant pressure or variable pressure water supplies. The valve is made suitable for use on variable pressure water supplies by adding the optional retard chamber to the standard trim.
  • The valve is available with a flanged inlet and flanged outlet or with a grooved inlet and grooved outlet.