----- Original Message -----
Sent: Friday, January 20, 2006 9:48
PM
Subject: Re: [PSUBS-MAILIST] Ambient /
1ATM Q?
Hi Simon. Bill Akins here. I saw your questions
and hope Rick won't mind if I also answer you as well as he.
I will take them in the order you
asked.
1. The regulator will be mounted outside the hull
but its mouthpiece (or tube leading from the mouthpiece) will be going thru
the hull into its interior.
2. Rick may know the pressure difference required
to allow the damand valve to open, but it doesn't matter if he does or
doesn't. The demand
valve will open automatically when the outside
water pressure exerts enough pressure on the rubber diaphram, and close when
the inside pressure
presses the rubber diaphram back. As Rick said,
automatic equalization.
3. You are correct that there would be no
pressure difference if the diaphram and mouthpiece were in the same
compartment. That's why they are not.
4. Rick will be placing his regulators low in the
hull so they will activate BEFORE the rest of the hull reaches that depth to
overcome the lag time it takes
for the regs to equalize the hull and there
should be no hull structure concern. If he built a reasonably sturdy ambient
hull it wouldn't have that much pressure on it
even if there were a few seconds lag time before
it equalized, but with his regs low, they activate early actually keeping a
slight overpressure in the cabin and as
Rick said he would see any leaks as bubbles
outside. Rick, add to this if I missed anything. Hope this helped you
Simon.
Bill Akins.
----- Original Message -----
Sent: Friday, January 20, 2006 5:15
PM
Subject: RE: *** SPAM *** Re:
[PSUBS-MAILIST] Ambient / 1ATM Q?
Hello Rick
I'm struggling with your ambient regulator design slightly as to
where the regs will be mounted with regard to external water pressure and
equalised internal pressure. Do you know what pressure difference you
require to allow the demand valve to open. I know what you mean about
the 2nd stage adjustment, my Apeks regs have the same, but if the reg
mouthpieces are open in the same compartment as the diaphragm on the front
then there is no pressure difference acting on the lever within the reg and
i can't see how it will open. Also if the diapragms are located in a
compartment at external pressure while the mouthpieces are within the cabin,
can the structure of the sub hull cope with the increased pressure on the
hull until the internal pressure has increased to equalise or will the
pressure equalise by compressing the cabin hull.
Sorry, I'm sure I'm missing something with your design but I'm
beginning to think about an ambient myself and could use the help as my
breathing system will probably be based on normal scuba gear. If you have
time I'd appreciate the help.
Regards Simon