1.1.3 One Way Valve Check
B
WARNING
Never dive if the one way valve is
not operating properly. If the hose
for breathing gas or air fitting 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.
B
WARNING
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 flow 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
