3
WARNING
!
Depressurize valve before servicing.
Removing Cam-Checks
1. Shut down the water system and lock out the system, if pos-
sible. Slowly open all ball valves to relieve air and water pres-
sure. Loosen bolts on the groove coupler and remove the
groove coupler and cover plate from the body.
2. For check No. 1, using a 9/16" socket wrench or nut driver,
remove the four nuts from the No. 1 check studs. (See
Figures 1 and 2.) Using two hands, placing them at 12
o’clock and 6 o’clock, wiggle the cam-check assembly free.
Remove the assembly through the access port with the back
of the clapper first, spring end down. Pull the assembly out
of the main body.
3. For check No. 2, after loosening bolts with a 9/16" socket,
remove the bolts completely. (See Figure 3.) Using the cen-
terline access bar, spin the cam-check assembly from the 9
o’clock position to the 12 o’clock position. Then (without let-
ting go of the access bar) push the assembly slightly down-
stream so that the clapper is parallel with the valve body.
Now bring the assembly through the check retaining wall.
Leave the assembly clapper parallel with the valve body. Pull
the assembly through the access port.
4. Place a 3/8" nut driver or a piece of small diameter pipe
on the cam arm torsion spring and move it away from and
around the torsion spring retaining bracket so as to relieve
the torsion spring tension. (See Figure 4.) This allows the cam
arm to move freely, enabling inspection of the clapper face
and cam seat. Thoroughly clean the seat area and clapper
sealing surfaces, cam arms, and O-rings for damage, nicks,
and debris. If any parts are damaged, install a new check
assembly O-ring, or washer, shutoff disc.
5. Reassembly reverse of disassembly, carefully tightening the
torsion spring, installing the checks, and tightening the studs.
6. Before reinstalling the check assembly, thoroughly clean the
O-ring groove and apply an FDA-approved lubricant to the
O-ring.
Maintenance Instructions
No. 1 Cam-Check
No. 2 Cam-Check DC
Cam arm torsion spring
Figure 4
Figure 3
Figure 2
Figure 1
1
5
2
3
4
6
Check Studs
8
7
Flow
9
Item Description
1
No. 1 Cam-Check
2
No. 2 Cam-Check
3
No. 1 Cam-Check O-ring
4
No. 2 Cam-Check O-ring
5
Ball Valve
6
Cover Plate
7
Groove Coupler
8
Washer, shutoff disc
9
Groove Coupler Gasket
For repair kits and parts, refer to the Backflow Prevention
Products Repair Kits & Service Parts price list
PL-A-RP-BPD found at
watts.com.
