User Guide

Note: Shutoff Valves: When shutoff valves are removed and reassembly is nec-
essary, the shutoff valve with the test cock is to be mounted on the inlet side
of the backflow preventer.
A. The 009 should always be installed in an accessible location to facilitate testing
and servicing (See page 2). Check the state and local codes to ensure that
the backflow preventer is installed in compliance, such as the proper
height above the ground.
B. We recommend a strainer be installed ahead of 009 series assemblies to pro-
tect the internal components from unnecessary fouling.
Caution: Do not install with strainer when backflow preventer is used on sel-
dom-used water lines which are called upon only during emergencies, such as
fire sprinkler lines.
Start Up: The downstream shutoff should be closed. Open upstream slowly and fill
valve. When valve is filled, open the downstream shutoff slowly and fill the water
supply system. This is necessary to avoid water hammer or shock damage.
C. Water discharge from the relief valve should be vented in accordance with code
requirements. The relief valve should never be solidly piped into a drainage ditch,
sewer or sump. The discharge should be terminated approximately 12" above
the ground or through an air gap piped to a floor drain.
NOTE: Relief Valve Discharge Rates
The installation of an air gap with the drain line terminating above a floor drain
will handle any normal discharge or nuisance spitting through the relief valve.
However, floor drain size may need to be designed to prevent water damage
caused by a catastrophic failure condition. Please refer to Figure No. 1 for
maximum relief valve discharge rates, size and capacity of typical floor drains.
NOTE: Do not reduce the size of the drain line from the air gap fitting. Pipe full
line size.
D. After initial installation, a discharge from the relief valve opening may occur due
to inadequate initial flushing of pipe lines to eliminate dirt and pipe compounds.
If flushing will not clear, remove the first check valve and clean thoroughly.
NOTE: Periodic relief valve discharge may occur on dead end service applica-
tions, such as boiler feed lines or cooling tower makeup lines due to fluctuating
supply pressure during a static or no flow condition. To avoid this discharge,
install a spring-loaded rubber seated check valve ahead of the backflow
assembly to “lock-in” the downstream pressure.
E. Backflow preventers should never be placed in pits unless absolutely neces-
sary and then only when and as approved by local codes. In such cases, pro-
vision should be made to always vent above flood level or for a pit drain to
ensure an adequate air gap below the relief port.
F. It is important that Series 009 backflow preventers be inspected periodically
for any discharge from the relief valve which will provide a visual indication of
need for cleaning or repair of check valves. Also testing for proper operation of
the device should be made periodically in compliance with local codes, but at
least once a year or more often, depending upon system conditions.
Relief vent will discharge water when, during no-flow periods, (1) the first
check valve is fouled or (2) the inlet pressure to the device drops sufficiently
due to upstream pressure fluctuations to affect the required operating differen-
tial between the inlet pressure and reduced pressure zone. Otherwise, such
relief (spitting) can occur when the second check is fouled during emergency
backflow or resulting from a water hammer condition. For troubleshooting
guide send for S-TSG.
NOTE: Special considerations are necessary when testing assemblies installed on
Fire Prevention Systems.
Fire Protection System Installations: The National Fire protection Agency (NFPA)
Guidelines require a confirming flow test be conducted whenever a “main line”
valve such as the shutoff valves or a backflow assembly have been operated.
Certified testers of backflow assemblies must conduct this confirming test.
Relief Valve Discharge Rates
TYPICAL FLOW RATES AS SIZED BY FLOOR DRAIN MANUFACTURERS:
2" (50 mm) 55 GPM 5" (125 mm) 350 GPM
3" (80 mm) 112 GPM 6" (150 mm) 450 GPM
4" (100 mm) 170 GPM 8" (200 mm) 760 GPM
3
1
⁄2" – 1" (15-25mm) 009
1
1
⁄4" – 3" (32-80mm) 009
45
40
35
30
25
20
15
10
5
0
0 102030405060708090100150
Zone Pressure psi
Flow Rate gpm
350
300
250
200
150
100
50
0
0 102030405060708090100150
Zone Pressure psi
Flow Rate gpm
1
1
⁄4" – 1
1
⁄2" M2 2
1
⁄2" – 3"
2" M2
1
⁄2"
1" M2
3
⁄4" M2
Installation Instructions
Figure 1
X