Backflow protection devices - Watts Industries

BACKFLOW PROTECTION DEVICES10InstallationThe BA 909 backflow protector must beinstalled so that it is easily accessiblefor maintenance and in order to verifythat it is operating properly.It must be installed horizontally with astrainer on the inflow side of the BA909, in such a way as to protect thevalves against unnecessarycontamination. Moreover, a shut-offvalve must be installed both upstreamand downstream of the device in thewater line. The overflow opening canbe connected to the drain via an airgaptundish set.If installed without a drain, the devicemust be installed at a height of aminimum of 2 x DN ≥ 20 mm above thesink hole. This may only be installedafter the pipe system has been cleanedin the normal method.Installation exampleInstalling two devices inparallel makes it possible toperform maintenanceproperly without disruptingthe water delivery.