5
IOM-A-Deringer 20G/20GX/30G/30GX_6-8
2005
EDP#2916000
© 2020 Watts
Maintenance of First Dual-action Check Module (continued)
NOTICE
Maintenance of Second Dual-action Check Module
1. Use a #2 phillips head screwdriver to remove tower screws
(A) from the second check seat (B). The double torsion
spring (C) is captured and does not need to be retained
during maintenance.
2. After removing the tower screws (A) examine the elastomer
disk (D) and check seat (E) for fouling or damage.
3. Should elastomer disk (D) need replacement unscrew disk
retainer screws (F) and remove disk retainer (G). Carefully
remove and replace elastomer disk (D). When replacing
elastomer disk (D) be certain that no air, water or debris is
trapped in the clapper (H) cavity behind the elastomer disk (D).
4. Reverse the order of the above instructions to reassemble check.
• Elastomer disk must be flat in clapper (H) cavity before
tightening disk retainer screws (F).
• Do not cross thread disk retaining screws (F).
F
G
D
H
B
C
A
E
D
Maintenance of Second Dual-action Check Module
NOTICE
First Check Tower Bosses and Spring Arms Face Up
Orient seat protrusions as shown
Tower Bosses
Spring Arms
The diagram on the right shows the correct orientation of the
first dual-action check module when being re-attached to the
seat. In order to maintain the performance of the valve pay
attention to the proper orientation of the check module.
Second Check Tower Bosses and Spring Arms Face Down
Orient seat protrusions as shown
Tower Bosses
Spring Arms
The diagram on the right shows the correct orientation of the
second dual-action check module when being re-attached to
the seat. In order to maintain the performance of the valve pay
attention to the proper orientation of the check module.
