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The original question was should the isolator valve be fully open or
partially open.

In this type of diving, we fall into the trap of trying to solve what should
be non-problems with complex equipment setups, non-standard gas mixtures,
and so on. This is another of those cases. A properly trained diver who
practices working with valves on real dives, will be able to quickly put a
hand on that isolator valve and rotate it in the correct direction, and
fully close it. The action should be instinctive, so that it will happen
correctly under high stress conditions. The diver will be able to do this
whether that valve is partially open or fully open. When it comes time for
mixing, that diver will be able to ensure that the valve is fully open. If
for some reason, the tanks are filled with the valve closed, that same diver
will detect the error, probably before loading the tanks in the vehicle.

Get rid of the paranoia by practicing diving skills. With respect to diving
skills and ability, it does not matter whether that valve is partially or
fully open. With respect to the equipment itself, there is no reason to have
the valve partially open -- open it all the way. What do I do? Until this
question came up, I dived with the valve 3/4 turn open (that's a little less
than two twists of my wrist to close it). This question has caused me to
rethink my logic for doing this. Because I can close that valve quickly, an
extra two twists of my wrist won't make much of a difference in the time
required to do it. If anything, it was stupid for me to dive it partially
open, because I had no need to allow for a lack of skill in closing it! It's
so good to be free of the paranoia!

-Randy



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