[PSUBS-MAILIST] first stage reg.

[Rick Patton via Personal_Submersibles]

I bought a new Scuba pro 02 cleaned first stage regulator (MK ll) several
years ago per a thread going around on this site as the preferred reg as my
HP 02 tanks were going to be outside the sub and subject to the ambient
water pressure.

My original thought was to daisy-chain them both together and then use the
one reg to break the pressure down before coming inside the sub but I now
want to be able to pull off of only one bottle at a time so when checking
into getting another Scuba pro MK ll, they said that it was unbalanced.

Doesn't it have to be balanced so that it is always giving me around
140-150 psi over ambient to the sub? I don't think it would be a problem as
it is always pushing the LP 02 into a one atmosphere area but am having a
brain fart about this. Doesn't the first stage have a spring in it that is
subject to the ambient water pressures that would lessen the output
pressure the deeper you go?

Rick
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