Sentry Sprinklers Model ACVV-300 is a ductile iron, Alarm Check Valve that is intended for use in wet pipe (automatic sprinkler) fire protection systems. The Alarm Check Valve Assembly consists of the Alarm Check Valve (ACVV-300), the Water Motor Gong (WMG-300), the Retard Chamber (RC-300) and the Trim. The assembly is rated for a maximum operating pressure of 300 PSI (20.7 Bar). The Alarm Check Valve Assembly serves two purposes, it prevents a reverse flow of water above the valve clapper (non-return) from the sprinkler piping and it provides a hydraulic alarm when there is a steady flow of water into the system that is equivalent to the discharge rate of one or more sprinklers. The valve is anti-corrosion with 10 mil (250μ) of fusion-bonded epoxy coating on both the inside & outside.
The Alarm Check Valve Assembly is suitable for vertical installation. A Retard Chamber (RC-300) can be installed to the valve assembly trim in order to prevent false alarms where the water main supply pressure varies. Where constant pressure water supply is used, the Retard Chamber (RC-300) (time-delay) is not necessary. The Alarm Check Valve Trim incorporates a port to install an electrical pressure switch to provide other supplemental alarms and annunciators that can also be used.