Installation Instructions
Series 007 and LF007
1
⁄
2
" - 2" (15 - 50mm)
Service and Maintenance
Servicing the First and Second Check Valves
NOTICE
Before servicing, ensure supply water is turned off or shutoff valves
are in the closed position.
Open test cocks #2, #3, and #4 to
relieve pressure inside the valve prior to removing valve
cover.
1. Remove the cover, then remove the retainer from the body
valve. The check valve modules can now be removed from the
valve by hand or with a screwdriver.
NOTICE
For Series 007 and LF007 sizes
1
⁄
2
" - 2", the seats and springs of
the first and second check modules are not interchangeable. The
heavier spring and smaller diameter seat belong with the first check
module. Series 007M1 sizes
3
⁄
4
" - 1" and Series 007M2
3
⁄
4
" (20mm)
have interchangeable seats and springs.
2. The check seats are attached to the cage with a bayonet type lock-
ing arrangement. Holding the cage in one hand, push the seat in-
ward and rotate clockwise against the cage. For
3
⁄
4
" (20mm) Series
007M2/LF007M2 and LF007 pull apart seat and cage. The seat,
cage, spring and disc assembly are now individual components.
3. The disc assembly may now be cleaned and reassembled or,
depending on its condition, it may be discarded and replace with
a new assembly from the repair kit. O-rings should be cleaned or
replaced as necessary.
4. Reassemble the check valve module in the reverse order. Check
modules are installed in the valve body with the seats facing the
valve inlet. The modules must be securely in place before the
retainer can be replaced. On the
3
⁄
4
" - 1" size, this retainer may
have to be tilted slightly into place.
Replace cover, and close
all test cocks before returning the valve to service.
First
Shutoff Valve
Strainer
007QT-S / LF007QT-S
WattsBox Insulated
Enclosure
Available in Aluminum
or Fiberglass.
For more information,
send for ES-WB.
First
Shutoff Valve
First Shutoff Valve
Figure 1
Figure 3
First Shutoff
Valve
007QT-S/LF007QT-S
Vertical flow-up installation
Strainer
007QT-S / LF007QT-S
Cover
Cover
O-ring
Retainer
Body
First Check
Second Check
Seat
Seat
O-ring
Disc
Assembly
Spring
Check
Cage
O-rings
Check
Cage
Spring
Disc
Seat
Cover
Cover
O-ring
Retainer
Body
Second Check
First Check
Parallel -
Figure 3
Two or more Series 007 and LF007 smaller size valves may 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/where interruptions for test-
ing and servicing would be unacceptable. It also has the advantage
of providing increased 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 engineers judgement based on the operating conditions of a
specific installation.
2
For repair kits and parts, refer to our Backflow
Prevention Products Repair Kits & Service Parts
price list PL-RP-BPD found on
www.watts.com.
Figure 2
