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If you are familiar with scuba equipment, it can
work sort of like a regulator second stage.
A penetration through the hull is sealed with a
heavy rubber membrane.
On decent, pressure from outside the hull
presses against the rubber membrane. The flex of the membrane inward
presses against a lever valve that bleeds air into the hull interior. As the
pressure equalizes between the outside water prerssure and the interior, the
membrane moves back to a nuetral position stopping the air flow.
On accent, excess pressure on the interior flexes
the membrane outward, pushing on a second lever valve on the outside of the
membrane which allows pressure inside to bleed off on accent.
The problem would be making sure the flow rates of
the valves are enough to keep up with the accents and decents.
Just an idea...
Chip
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