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Installation Guidelines
Indoors
Check local codes for installation requirements. Pipelines should be
thoroughly flushed to remove foreign material before installing the
unit. A strainer should be installed ahead of the backflow preventer
to prevent the disc from unnecessary fouling, whether in horizontal
or vertical position. (See Figure 1.) Install the valve inline with the
arrow on valve body pointing in the direction of flow.
For indoor installations, the valve must be easily accessible to
facilitate testing and servicing. The assembly can also be installed
in a WattsBox insulated enclosure. (See Figure 2.) Do not install the
assembly in a concealed location.
CAUTION
!
Do not install a strainer when the backflow preventer is intended
for seldom-used water lines that are activated during emergencies,
such as fire sprinkler lines.
Series 007 and LF007 must be tested periodically in compliance
with local codes, but at least once a year or more often depending
upon system conditions. Regular inspection, testing, and cleaning
assure maximum life and proper product function.
NOTICE
Fire Protection System Installations. The National Fire Protection
Agency (NFPA) Guidelines require a confirming flow test to be con
ducted whenever a "main line" valve such as a backflow assembly or
the shutoff valves have been operated. Certified testers of backflow
assemblies must conduct this test. The trim valves of the detector
meter bypass line, on assemblies so equipped, should be shutoff
during the confirming flow test. When the test is completed, the trim
valves must be returned to a fully open position.
Meter Box Installation
Parallel
Two or more Series 007 and LF007 smaller size valves may be
piped in parallel (where approved) to serve a larger supply pipe
main. (See Figure 3.) This type of installation is employed whenever
it is vital to maintain a continuous supply of water or where interrup
tions for testing and servicing would be unacceptable. The instal
lation increases capacity where needed beyond that provided by a
single valve and permits testing or servicing of an individual valve
without shutting down the complete line.
For two valve installations the total capacity of the devices should
equal or exceed that required by the system.
The quantity of valves used in parallel should be determined by
the judgment of the compliance engineer, based on the operating
conditions of a specific installation.
2
Figure 1
Strainer
Figure 2
WattsBox Insulated
Enclosure, available in
aluminum or fiberglass
Figure 3
First
Shutoff Valve
First Shutoff Valve
007QT-S / LF007QT-S
First
Shutoff Valve
007QT-S / LF007QT-S
First Shutoff
Valve
Strainer
007QT-S/LF007QT-S
Vertical flow-up installation
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