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Brent, You should have attended my workshop at the Conference this year
and this would all be clear. I did not see any dump or relief valves in
the first link and the second link had probably two dump valved lift
bags. All of these bags appeared to have open bottoms (can spill or lose
the “bubble” upon surfacing) so do not need relief valves. Depending
on how they are configured, a relief valve may also act as a dump valve but a
dump valve may not be constructed to act as a relief valve. See ProLift bags, you want to use a commercial-grade bag for
submersible work. Another thing to consider is that bags deteriorate over
time and also can abrade easy. I would not consider them for everyday ballast
control…a conning tower dam yes but not for ballast control.
Experience has shown me that I wouldn’t count on a bag that is stowed for
any length of time also, they have a nasty habit of failing just when you need
them the most. R/Jay Jay K. Jeffries Andros Is., Bahamas
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig Some SCUBA guys are calling them dump valves. Your resident pipe dreamer ;)' |