Kirby Morgan One Way Valve User manual

One Way Valve
Contents
OWV-1 1.1 One Way Valve
OWV-1 1.1.1 Disassembly Of The One
Way Valve
OWV-2 1.1.2 Reassembly of the One
Way Valve
OWV-3 1.1.3 One Way Valve Check
OWV-3 1.1.3.1 Oral One Way Valve
Check
OWV-3 1.1.3.2 Low Pressure One
Way Valve Check
1.1 One Way Valve
NOTE: The one-way valve assembly should be
disassembled, cleaned and the three O-rings
should be replaced at least annually. Dam-
aged and/or corroded parts should be replaced.
A repair kit is available for replacement parts,
KMDSI Part #525-330.
BCAUTION
Do not use pliers on the main body of
the one way valve. You may damage
the valve if pliers are used.
Do not use pliers on the main body of
the one way valve
1.1.1 Disassembly Of The One Way Valve
Tools Required:
• Soft Jaw Vise
• 1" 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.
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.
BCAUTION
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.
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 func-
tion of the cage is to contain the poppet during
high gas ows.
BWARNING
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
© MMXX Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 200915002 OWV-1
One Way Valve One Way Valve

any type and clean, if necessary. Clean in accor-
dance with the KMDSI cleaning instructions. If
corrosion is present, clean using the acidic solu-
tion as outlined in the KMDSI cleaning proce-
dures.
4) Inspect the seat, wiper, O-ring, poppet O-ring
and poppet for wear, replace if necessary. Note:
If removing 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). This one-way valve kit is also in-
cluded in all the standard helmet and BandMask
soft goods kits. 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.
1.1.2 Reassembly of the One Way Valve
1) Slide the new O-ring over the poppet.
2) Insert the new spring into the valve body, fol-
lowed by the poppet.
Note the position of the wiper.
3) Next, install the new wiper and new O-ring on
the seat. Thread the seat into the valve body.
4) Torque the seat with a torque wrench
while holding the body in a soft jaw
vise or wrench. See Appendix Contents,
Torque Specs on page APNDX-19 .
Torque the one-way valve (non-return) into the
sideblock with a torque wrench. See Appendix
Contents, Torque Specs on page APNDX-19.
5) If the adapter has been removed, it must be
cleaned and wrapped with Teon®tape before re-
installing.
BWARNING
Do not allow any Teon®tape to cover
the end of the adapter, or to enter the
one-way valve. Loose pieces of Tef-
lon®tape can interfere with the per-
formance of the one-way valve or the
regulator and may block the diver’s
air supply. This could lead to death
through suffocation.
Correct assembly order of the one way valve.
ADAPTER WIPER O-RING SPRING
SEAT O-RING POPPET
BODY O-RING
OWV-2 © MMXX Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 200915002
One Way Valve One Way Valve

1.1.3 One Way Valve Check
BWARNING
Never dive if the one way valve is
not operating properly. If the hose
for breathing gas or air tting breaks
while operating underwater a serious
injury could result to the diver’s lungs
and/or eyes. In extreme cases this
could be fatal.
The one way valve must be tested daily prior to
the commencement of diving operations.
There are two methods for testing the one way
valve.
1) Orally
2) Using regulated low pressure.
BWARNING
The one way valve must be tested
daily, prior to commencement of div-
ing operations. Failure of the one way
valve could cause serious injury or
death.
The free ow valve must be open when perform-
ing the test.
1.1.3.1 Oral One Way Valve Check
1) Test the one way valve for proper operation by
blowing and sucking (cycling) on the umbilical
adapter. No gas should be drawn through the one
way valve. If you are able to suck any air through
the one way valve, it is not working properly and
should not be used.
1.1.3.2 Low Pressure One Way Valve
Check
1) Close the emergency and defogger control
knobs and screw in the adjustment knob on the
regulator all the way.
2) Attach a regulated gas supply (normally using
the EGS system), adjusted to between 135–150
psig (9.3–10.3 bar), to the emergency valve.
3) Open the emergency supply valve all the way
and then slowly open the gas supply.
4) Check for gas exiting from the one way valve.
There should be no gas exiting the umbilical
adaptor. If any gas exits through the one way
valve it is not working properly and should not
be used.
Checking the one way valve. With the bail-out
bottle connected to the emergency valve, no gas
should escape through the one-way valve when
the EGS valve and cylinder valve are opened.
© MMXX Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 200915002 OWV-3
One Way Valve One Way Valve