8
IOM-A-Deringer 20/30_2.5-4
2005
EDP#2916002
© 2020 Watts
Installing Second Dual-action Check Module
1. Insert second check module (A) into access port (B) with second
check towers (C, pictured inside the valve body) pointing down-
stream. Push second check module (A) downstream into valve seal-
ing ring (D) until check O-ring (E) rests against valve sealing ring (D).
Push second check module (A) into its fully seated position by hand.
2. Alternatively place 2"x4" piece of wood cut to 5" length (F) against
the backside of the second check seat ring (G). Using a 1"x4" piece
of wood cut to 16" length (H) as a lever between access port wall
the 2"x4" (F) gently move the second check module (A) into its fully
seated position.
3. Be certain second check module (A) is fully seated and check O-ring
(E) is NOT “fish mouthed” or damaged.
4. Tighten the second check retaining screws (I)
ONLY AFTER
the
first
check module (A) has been installed.
The second check module must be fully seated to ensure
retainer screws do not bind against check seat. Binding
retainer screws against check seat will result in permanent
damage to second check modules.
WARNING
!
FLOW
D
A
B
G
Not Binding
Binding
H
F
I
E
C