Re: [PSUBS-MAILIST] Regulating Pressure in 1 ATM Sub

[Thijs Struijs <thijs-struijs@planet.nl>]

Welcome Rob,

When you breath you use O2 and you exhale CO2. The CO2 is absorbed and the
pressure drops. Metal bellows are expanded and they open a valve that admits
O2 to enter the sub until the original pressure is reached. (The bellows are
compressed and the valve is closed). There was a discussion on the subject
in june 2002. Look in the archive for the subject "source for a demand
regulator". Phil Nuytten has written an interresting artikel on the subject.
I printed it but i do not know where i got it from. I cannot help you on the
"purge compressor", i do not know what it is.

Good luck
Thijs Struijs
The Netherlands

----- Original Message -----
From: <robertbatta@comcast.net>
To: <Personal_Submersibles@psubs.org>
Sent: Thursday, November 06, 2003 8:54 PM
Subject: [PSUBS-MAILIST] Regulating Pressure in 1 ATM Sub


> Hello,
>
> I am new to the group and plan on building a 2 man dry 1 atm sub.  I plan
on using a CO2 Scrubber and O2 replenishment.  With the O2 bleeding in, how
to I ensure the sub stay at a nominal 1 ATM pressure ?
>
> I've read that the "Luxury" sub's use a "purge compressor" to achieve
this, however, I can find little to no information on this type of
compressor.
>
> I read some of the archive posts, someone has asked the question before -
I apologize for repeating it, but I did not see a clear answer.
>
> Thanks in advance.
>
> Rob Batta
>
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