Removing Checks
Before Servicing Be Certain Shutoff Valves Are Closed
The assembly may be locked open by aligning the holes
in the cam bar and hinge arms and inserting a rod (see
Fig. 8, pg.6). If the clapper needs to be replaced or re-
paired, please refer to check disassembly instructions
and figures 6 through 10 on page 6. Caution: If the seat
is damaged, replace complete check module. If replace-
ment is not required, please continue.
To clean No. 2 check, lift arm and hold in open position
(see Fig. 9, pg. 6). Thoroughly clean the seat area and
clapper sealing surfaces of both checks. Rinse checks
and o-rings thoroughly.
Installation of Cam-Checks
Before installing checks, thoroughly clean o-ring grooves
and lubricate o-rings with FDA approved lubricant. Insert
and thread No. 2 check first and then No. 1 check. No. 2
check should be tightened by inserting a long screwdriver
between lid bolts inserted in seat ring to tighten. Prior to
filling the system, please ensure that lid bolts are tightened
(50 ft.lbs.), cover plate is properly secured, and test cocks
are open.
Start Up: The downstream shutoff should be closed. Open
upstream slowly, fill the valve and bleed the air through test
cocks 2, 3 and 4. When valve is filled, open the down-
stream shutoff slowly. This is necessary to avoid water
hammer or shock damage to the water system.
Figure 2
No. 2 Cam Check
(6" and 8" models only)
Place yourself so that the water flow through the valve is
left to right.
1. Shut down water system and lock out system if possible.
Slowly open all ball valves to relieve air and water pressure.
After pressure is relieved, loosen bolts on groove coupler
and remove groove coupler and cover plate from valve body.
2. Remove No. 1 check assembly by unscrewing (turn counter-
clockwise) check and remove through top access port. Do
not use arm as a handle to unscrew check. Insert lid bolts in
1st check seat ring (see Fig. 1), insert a long screwdriver or
pry bar between lid bolts. Gently apply pressure against the
bolts and turn seat assembly counter clockwise moving
bolts hole to hole to maintain turning leverage (two addi-
tional bolts will eliminate need to move lid bolts from hole to
hole). Finish unscrewing by hand and remove from valve
body. Unscrew No. 2 check (turn counterclockwise) by plac-
ing a long screwdriver across lid bolts inserted in holes lo-
cated in the 2nd check seat ring, similar in method used to
remove 1st check and applying pressure to loosen No. 2
check. Finish unscrewing by hand.
3.To clean check assemblies, locate the check arm opening
stud on the outlet flange of the valve assembly, (6" and 8"
only). Slide the arm over the stud with the check threads fac-
ing downward (Fig. 2). Tighten a
1
⁄
4
" nut on stud to secure.
Slowly pull the assembly outward to open check allowing
exposure of the seat and clapper contact area for cleaning.
4
Figure 1
No. 1 Cam Check
Figure 6
Valve outlet flange
Threaded stud on flange
