3
Spring Retainer
(Do Not Remove)
Spring
O-ring
Spring Retainer
(Do Not Remove)
Disc
Disc Holder
Retaining
Ring
Disc Retainer
Allen Head
Socket
Screws
Stem
Disc Holder
2
1
⁄
2
", 3"
4" - 10"
Cover
Cover
O-ring
Disc &
Spring
Assembly
Seat
Seat
O-ring
Retainer
Wire
Servicing First and Second Check Valves
CAUTION
!
The series are designed so that, when the bolts are backed off
1
⁄
2
", all the spring load is released from the cover and retained
by the check module. Verify this before removing all the bolts.
1. Remove hatch cover bolts.
2. Lift check valve module straight out, taking care not to hit
and damage seat ring.
3. Remove the seat ring for replacement by pulling out the two
10" wire retainers. One wire is drawn out clockwise; the
other, counterclockwise.
4. With the retainer wires removed, lift the seat ring straight up
to remove it.
CAUTION
!
The check valve disc-and-spring assembly are in compression.
The spring load is captured by the two spring retainers and the
stem. The spring retainers are not to be removed for servicing.
If there is a need to replace the spring, spring retainer, or stem,
replace the disc-and-spring assembly.
If the disc holder has been damaged by freezing or severe
water hammer, it can be replaced in the field. Remove the disc
holder retaining ring and slide the disc holder off the stem.
Remove the O-ring from the stem and replace it with a new
one. Apply grease to the O-ring and slide the new disc holder
into place. Reinstall the retaining ring.
NOTICE
The disc holder should not be removed when servicing only the
disc, remove the Allen head screws holding the disc retaining
plate and replace the disc.
WARNING
!
The disc-and-spring assembly assembly is factory assembled.
DO NOT DISASSEMBLE.
Clearance Required for Servicing
SIZE
DIMENSION
A
in.
in.
mm
2
1
⁄
2
– 3
10
250
4
15
380
6
15
380
8
23
580
10
25
640
▼
▼
A
