Installation
The 573 Series FlowShield DuC-AV backflow preventer with atmospheric vent must be installed
in accordance with the diagrams contained in this instruction manual taking into account all the
applicable Codes and Regulations.
Before installing, the system must be thoroughly flushed to remove impurities or any debris which
may have accumulated during installation. Failure to remove dirt or debris may affect performance
and the manufacturer’s guarantee.
The 573 Series FlowShield DuC-AV backflow preventer must be installed preferably horizontally
and following the flow direction indicated by the arrow on the valve body.
It also must be installed with one isolating valve and a strainer upstream and one isolating valve
downstream.
The 573 Series FlowShield DuC-AV backflow preventer must be installed in an accessible location
to facilitate testing and servicing.
It must be installed with the vent port connected via an air gap to a discharge line, in accordance
with the plumbing code requirements and keeping a minumum distance of 12” from the floor.
Do not install where the discharge can could cause damage.
If field testing is required by code, it must be installed in accordance with the relevant diagram in
this instruction manual.
NOTE:
When installing the 573 series FlowShield DuC-AV with sweat tailpieces, sweat the tailpiece to the
pipe before installing the body which includes an embedded o-ring.
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