One Way Valve - Kirby Morgan 77 Operation And Maintenance Manual

Kirby Morgan 77
®
Seat
Adapter

7.3 One Way Valve

NOTE: The one-way valve assembly should be disassem-
bled, cleaned and the three o-rings should be replaced at
least annually. Damaged and/or corroded parts should
be replaced. A repair kit is available for replacement
parts, KMDSI Part #525-330.
CAUTION
Do not use pliers on the main body of the
one way valve. You may damage the valve
if pliers are used.
7.3.1 Disassembly Of The One Way Valve
Tools Required:
Soft Jaw Vise
1 inch Open End Wrench Attachment on Torque
Wrench
(If no vise is available use a backup 1 inch open end
wrench)
To disassemble and inspect the one way valve as-
sembly:
1) The one way valve assembly must be removed from
the side block. Use the open end wrench to remove it.
78
O-ring
Wiper O-ring
Correct assembly order of the one way valve.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Poppet
Spring
CAUTION
Use two wrenches or hold the hex part
of the body in a vise while removing or
turning the seat with a wrench. Do not
use pliers on the main body of the one-
way valve. You may damage the valve if
pliers are used.
WARNING
Do not attempt to move or remove the
cage that sits inside the non-return (one-
way) valve. Any attempt to remove this
part can cause the non-return valve to
fail, which can lead to serious personal
injury or death.
2) After the one way valve has been removed, use
two wrenches or hold the hex part of the body in a
soft jaw vise while removing the seat with a wrench.
As the seat is removed, the wiper and the o-ring slide
out in place in a groove on the seat. The poppet and
the poppet o-ring usually come out in the seat being
followed by the spring.
The only functional part remaining in the valve body
is a non-moving, pressed-in cage. The function of the
cage is to contain the poppet during high gas flows.
3) Inspect the body interior for foreign matter of any
type and clean, if necessary. Clean in accordance
with the KMDSI cleaning instructions. If corrosion
is present, clean using the acidic solution as outlined
in the KMDSI cleaning procedures.
Body
O-ring