Alarm Check Valve

Model BAV-146 Alarm Check Valve is wet pipe sprin- kler system water supply check valve that makes 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 such as a sprinkler is activated.
The Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse 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 valve should 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.

OPTIONAL ACCESSORIES:
Retard Chamber
The Retard Chamber is required when the Alarm Check Valve is installed on systems with a variable pressure water supply in order to reduce the possibility of false alarms.
Water Motor Alarm
The Alarm Check Valve is designed to activate a mechanical alarm during a sustained flow of water (such as the flow required by an open sprinkler) causes the alarm check’s clapper to lift from its seat.
Alarm Pressure Switch
The Alarm Check Valve trim allows installation of pressure switches to operate local electric alarms and/or remote electric alarms during a sustained flow of water (such as the flow requires by an open sprinkler).