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Servicing First and Second Check Valves
CAUTION
!
The series are designed so that, when the bolts are backed off
⁄
", all the spring load is released from the cover and retained
1
2
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
in.
2
⁄
– 3
1
2
4
6
8
10
A
▼
DIMENSION
A
in.
mm
10
250
15
380
15
380
23
580
25
640
Spring Retainer
(Do Not Remove)
Spring
Spring Retainer
(Do Not Remove)
Disc Holder
Disc
Disc Retainer
O-ring
Disc Holder
Retaining
Ring
2
1
⁄
", 3"
Disc &
2
Spring
Assembly
Seat
Seat
O-ring
Allen Head
Socket
Screws
Stem
Cover
Cover
O-ring
Retainer
Wire
4" - 10"
3
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