Brochure

Device Selection Installation
Having a device on the con-
nection is not enough, the
device MUST be installed cor-
rectly. The following details
and illustrations will help you
in the proper installation of the
devices.
Reduced Pressure
Device
In these figures, the RP device
is shown on the service connec-
tion. The RP can also be used
for internal protection. The mini-
mum clearance of 12" above
the floor or grade is to ensure
an air gap between the relief
valve and any water that might
puddle beneath the device. The
maximum height is so that the
device will be easy to work on
during testing and maintenance.
If the device is in a protective
enclosure or mounted against a
wall, the minimum distances are
so that the device can be tested
and maintained.
RP - Reduced Pressure Assembly
DC - Double Check Assembly
PVB - Pressure Vacuum Breaker
AVB - Atmospheric Vacuum Breaker
DuC - Dual Check
DCAP - Dual Check with Atmospheric Port
The selection of the proper
type of device is important.
Depending upon the fluid that
can backflow, whether it is
toxic or non-toxic; and whether
there can be backpressure or
backsiphonage; it will govern
the type of device selected. The
following chart will help you
to decide what type of device
to use.
Side View
Protective
Enclosure
30" Max
12" Min
12" Min
Water Meter
Water Meter
Top View
24" Min
RP DC PVB AVB DuC DCAP
Continuous
Pressure
✓ ✓ ✓ ✓ ✓
Possible
Back-
pressure
✓ ✓ ✓ ✓
Possible
Back-
siphonage
✓ ✓ ✓ ✓ ✓ ✓
Nontoxic
✓ ✓ ✓ ✓ ✓ ✓
Toxic ✓ ✓ ✓
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