9
IOM-A-Deringer 20/30_2.5-4
2005
EDP#2916002
© 2020 Watts
Installing First Dual-action Check Module
1. Insert first check module (A) into access port (B) with first check
towers (C) pointing downstream. Push first check module (A)
upstream into valve sealing ring (D) until check O-ring (E) is
resting against valve sealing ring (D). Push first check module
(A) into its fully seated position by hand.
2. Alternatively, using a piece of 1"x4" wood cut to 16" length
(F) as a lever between the second check seat (G) and the first
check towers (C), push the first check module (A) into its fully
seated position.
3. Be certain first check module (A) is fully seated and check
O-ring (E) is NOT “fish mouthed” or damaged.
4. Now fully tighten the first and second check retaining
screws (I) .
The first check module must be fully seated to ensure
retainer screws do not bind against check towers. Binding
retainer screws against check towers will result in permanent
damage to first check modules.
WARNING
!
FLOW
Not Binding
Binding
C
A
B
E
F
G
D
NOTICE
Recommended torque for the check retainer bolts is 50 ft. lb.
I
Installing Access Port Cover
1. It is best to never remove the access port O-ring (A). Should the access port
O-ring (A) become dislodged, simply insert it back into access port groove (B).
2. Slide the Access Port Cover (C) into place being certain that access port
O-ring (A) does not become dislodged during the process.
3. Insert cover bolts (D) into tapered cover holes (E).
4. Use ratchet wrench (F) to sequentially tighten all cover bolts (D) alternating from
one side of the valve to the other.
A
B
E
C
F
D
