The Model RDVSR-EU is a vane-type waterflow switch for use on wet sprinkler systems. It is UL Listed and FM Approved for use on steel pipe.
The RDVSR-EU may also be used as a sectional waterflow detector on large systems. The RDVSR-EU contains two single pole, double throw, snap action switches, and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a flow of 38 LPM (10 GPM) or more occurs downstream of the device. The flow condition must exist for a period of time necessary to overcome the selected retard period.