Installation diagram
6
Installation diagram
BA
CK
FL
OW
PRE
V
Ser
ies
:
573
Siz
es:
1/2
”
-
S/
N
VEN T
BACKFL
OW
PREV
Ser
ie
s:
5
73
Si
zes
:
1/
2”
-
S/
N
VENT
Heating system application
BA
CKF
L
OW
PRE
V
Series
:
57
3
Si
ze
s:
1/2”
-
S/
N
VENT
Field testing installation
SUPPLY
Inlet test
valve
Upstream
shut-off
valve
Y-strainer Upstream
test valve
573 series
FlowShield
DuC-AV
backflow
preventer
Downstream
test valve
Downstream
shut-off valve
SUPPLY
Air gap
Vent
Drain
Floor
