Install Instructions

NOTE: Shutoff Valves: When shutoff valves are removed and re as sem bly is
necessary, the shutoff valve with the test cock is to be mount ed on the inlet
side of the backflow preventer.
A. The 009 and LF009 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 and LF009 series assem-
blies to protect the internal components from unnecessary fouling.
CAUTION:
Do not install with strainer when back flow preventer is used on seldom-used
water lines which are called upon only during emergencies, such as fire sprin-
kler lines.
Start Up: The down stream 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 ac cor dance 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 cat a stroph ic 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 flush ing 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 assem-
bly to “lock-in” the downstream pressure.
E. Backflow preventers should never be placed in pits unless ab so lute ly neces-
sary and then only when and as approved by local codes. In such cases,
provision 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 and LF009 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 condi-
tions.
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 differential
between the inlet pressure and reduced pressure zone. Otherwise, such relief
(spitting) can occur when the second check is fouled during emergency back-
flow or resulting from a water hammer condition. For troubleshooting guide
send for S-TSG.
NOTE: Special considerations are necessary when testing as sem blies
installed on Fire Prevention Systems.
Fire Protection System Installations: The National Fire protection Agency
(NFPA) Guidelines require a confirming flow test be con duct ed 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 confirm-
ing 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 10 20 30 40 50 60 70 80 90 100 150
Zone Pressure psi
Flow Rate gpm
350
300
250
200
150
100
50
0
0 10 20 30 40 50 60 70 80 90 100 150
Zone Pressure psi
Flow Rate gpm
Installation Instructions
Series 009 and LF009
Figure 1
1
⁄2"
1" M2
3
⁄4" M2
X
1
1
⁄4" – 1
1
⁄2" M2 2
1
⁄2" – 3"2" M2