----- 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