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62 MSL 72.161 Jetsam/Orca Spirit manual R.5
Automa c Diluent Valve (ADV):
The ADV on the OS LTE diving system works in the same manner as that on the standard Orca Spirit. However the ac‐
tual component is different. The ADV on the Orca Spirit is a Mikron second stage while the ADV on the OS LTE is the
original KISS version. The KISS ADV system is comprised of the ADV diaphragm and ADV valve stem. This is a popular
system as it has few parts which decreases the possibility of failure.
The ADV will add diluent gas to your breathing loop a er the loop volume has been reduced by either descending or
“breathing down” the volume of oxygen. The diver will get the feeling that there is no more air in the loop to breath.
All the diver needs to do is suck hard to trigger the ADV and it will feed him more gas. This is similar to the ac on of a
second stage regulator.
The ADV has been setup “ ght” enough that it doesn’t add diluent without the diver being aware. But it adds enough
gas so that a reasonable descent rate can be maintained. Any me the ADV triggers you need to check your PPO2. you
have either descended and compressed the gas in the loop or you have consumed enough oxygen to reduce the PPO2
significantly . This may also have caused you to lose buoyancy and descend.
The posi on of the diver will effect the ADV. If the diver is horizontal or face down, the ADV will trigger easily. If the
diver is ver cal, then it is more difficult to trigger. (A well fi ng harness is important; this will greatly reduce the diffi‐
cul es of being ver cal in the water). Also, rolling to your right side, while horizontal, will assist in triggering the ADV.
Diluent can also be added to the breathing loop via the mouthpiece. Simply go to open circuit mode, take a breath and
then open the loop again and exhale the gas into the breathing loop.
Another way to add gas to the loop via the mouthpiece is to close the loop only a 1/4 inch, for a second. You may need
to lightly push the purge bu on on the front of the 2nd stage. A small amount of gas will blow directly into the breath‐
ing loop.
In the Exhaust Valve/ADV/Work of Breathing sec on of this manual, you will see informa on on the ADV. Some of
this informa on is relevant to both styles of ADV, while other informa on is specific to the component. For ease, we
have repeated the ADV sec on of
Bubbling Apeks Exhaust Valve here, along with other relevant informa on to this
style of ADV.
Bubbling Apeks Exhaust Valve:
If your counterlung volume is correct and the exhaust valve is in good working order, and you s ll have a leaking ex‐
haust with the feeling of too much gas in the loop, you could have a problem with your ADV adding too much gas into
the system. If this is happening you will also no ce that your PPO2 is reading lower than usual and that your buoyancy
is off. This could be caused by a stretched, damaged or torn ADV diaphragm, a ADV valve stem which is damaged and,
also if the sea ng area of the ADV valve stem has debris in it. Inspect the diaphragm and valve stem for damage or
fault.
When reinser ng the ADV valve stem, clean the underside of the valve’s head and apply a small amount of lubricant to
it. This will keep it in good condi on and help it to seal. Also thoroughly clean the sea ng area.
*NOTE: ensure that the sea ng area of the valve stem is clean and debris free!! If there is the slightest amount of
dirt in this area, the valve stem will leak!
To determine if this is the problem, shut off the diluent gas. First you will no ce your PPO2 stabilize and stop dropping.
Also, the lungs will stop filling up all the way and the exhaust valve should stop purging.