2
Strainer Series 77F-DI-FDA-125
WattsBox Insulated Enclosures
Available in Aluminum or Fiberglass.
For more information, refer to ES-WB at watts.com.
Figure 2
Figure 3
Meter
Strainer
Series 77F-DI-FDA-125
Figure 1
NOTICE
The flange gasket bolts for the gate valves should be retightened
during installation as the bolts may have loosened due to storage
and shipping.
Installation Guidelines
Indoors
Series LF007 can be installed in either vertical or horizontal position.
Always install the valve in an accessible location to facilitate testing
and servicing. Do not install the unit in a concealed location.
Pipelines should be thoroughly flushed to remove foreign material
before installing the unit. A strainer should be installed ahead of
backflow preventer to keep the disc from unnecessary fouling. (See
Figure 1.) Install valve inline with arrow on valve body pointing in the
direction of flow.
CAUTION
!
Do not install with a strainer when the backflow preventer is
affixed to seldom-used water lines that are called upon during
emergencies, such as fire sprinkler lines.
Series LF007 must be tested periodically in compliance with local
codes, but at least once a year or more often depending upon
system conditions.
Outside Building Above Ground
In an area where freezing conditions do not occur, Series LF007
can be installed outside of a building. (See Figure 2.) The most
satisfactory installation is above ground and should be installed
in this manner whenever possible. In an area where freezing
conditions can occur, Series LF007 should be installed above
ground in an insulated enclosure.
Annual inspection of all water system safety and control valves is
required and necessary. Regular inspection, testing, and cleaning
assures maximum life and proper product function.
Parallel
Consult local codes for approval of a parallel installation. (See
Figure 3.) Two or more Series LF007 smaller size valves can be
piped in parallel (where approved) to serve a larger supply pipe
main. This type of installation is employed whenever it is vital to
maintain a continuous supply of water or where interruptions for
testing and servicing would be unacceptable. Other advantages
include providing increased capacity where needed beyond that
provided by a single valve and testing or servicing of an individual
valve without shutting down the complete line. For two-valve
installations the total capacity should equal or exceed that
required by the system.
The quantity of valves used in parallel should be determined by
the engineer’s judgment based on the operating conditions of a
specific installation. (Refer to F-FC regarding flow curves.)
