Pressure Regulator

[Subscuba@aol.com]

Hello,

I have finished my Sub and have launched it for the first time. This also
means I now have a new crop of problems to solve. My Sub is a wet Sub with a
slightly modified SCUBA regulator used for pressure compensation. One of my
problems is that I have a slow leak in the Battery/Air compartment which is
not a real problem, at present since the leak is very small, about 1 or 2
ounces in 3 hours. I would like to come up with a regulator that would always
give me a positive pressure of about 3 to 8 PSI.

Perhaps I get the leak when I turn the Sub upside down, inverted. My regulator
then probably produces a very slight negative pressure. I haven't been able to
spot any bubbles but I do get the small amount of water. It is seawater not
battery acid. I use sealed AGM lead acid batteries.

Anybody got any low cost ideas??? Like a simple mod to the SCUBA regulator?
The mods I have now stop any backflow through the normally used exhaust valve.
Bear in mind that when I come up, the system vents a lot of air. I estimate
about 2 to 3 cubic feet in about 20 seconds.

Ken martindale