74
© ⅯⅯⅩⅢ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318002
Chapter 7 - One Way Valve
Kirby Morgan
®
37SS
1) The one way valve assembly must be removed
from the side block. Use the open end wrench to
remove it.
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.
B
CAUTION
Use two wrenches or hold the hex
part of the body in a vise while remov-
ing 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.
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.
B
WARNING
Do not attempt to move or remove the
cage that sits inside the non-return
(one-way) valve. Any attempt to re-
move this part can cause the non-
return valve to fail, which can lead to
serious personal injury or death.
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.
4) Inspect the seat, wiper, o-ring, poppet o-ring and
poppet for wear, replace if necessary. Note: If remov
-
ing or replacing the wiper, be certain to note whether
it is located on the seat. Be sure each part is clean
and all components are lightly lubricated with the
appropriate lubricant.
A repair kit is available for replacement parts, (Part
#525-330). The one-way valve overhaul kit is also
included in( the standard helmet overhaul soft goods
kit.) All o-rings should be replaced during normal/
annual overhauls.
5) Be careful to wipe the poppet and poppet o-ring
thoroughly, removing nearly all silicone to prevent
foreign materials from sticking to these components.
6) Replace the spring.
7.3.2 Reassembly of the One Way Valve
1) Slide the new o-ring over the poppet.
2) Insert the new spring into the valve body, followed
by the poppet.
Note the position of the wiper.
3) Next, install the new o-ring and new wiper on the
seat. Thread the seat into the valve body.
4) Tighten the seat to 150 inch lbs. (17 newton meters)
with a torque wrench while holding the body in a soft
jaw vise or wrench.
Correct assembly order of the one way valve.
Adapter
Wiper
O-ring
Spring
O-ring
Seat
O-ring
Poppet
Body
