Dear Tony,
Thanks very much for the input, and your general
interest. I did not intend to cause a major furor by my off-handed remarks.
We have three very experienced mechanical engineers at our disposal and I am
merely a by-stander in this phase of the investigation. Years ago I did some
differential gas pressure work, but these high-flow, low differential pressure
schemes are not my cup-of-tea.....at present.
Marshall also sent me an interesting suggestion,
for which I am indebted. It is both reassuring...and greatly appreciated that
you gentlemen would take the time to volunteer such sincere suggestions.
Thanks again.
You may rest assured we NEVER engage in live tests
without extended preliminary checks. We are only too familiar with Murphy's
Law.
I am informed by our principal investigator that the
"specific" valve he desires is easily obtained......it is just that the cost
is greater than we would like (that is for the home-type builder). We have,
successfully employed constant relieving valves of the type used on our
commercially-built Altitude Compensation unit. However, they too, are a
little steep for the do-it-yourselfer.
Our optimum design criteria, for our present purposes,
involves operating pressure around 1.5 atmospheres (above atomospheric), with
a high-volume system relief valve (set at 2.5 atmospheres) as a safety
precaution.
We have been using a very elaborate---and pricey---commercial
facility for testing our ancillary equipment. e.g. Oxygen masks, home-built
nebulizer system, etc., for the 02 transport medium. This is a large
conventional hyperbaric chamber, with all the bells and whistles. One element
we are attempting to determine is the most comfortable pressure range for a
majority of reasonably uncompromised adults
in the 50 to 70 year age range. This requires actual human beings, not
computer modelling. In any event when our folks finish this endeavor I will
attemopt to summarize their findings.
Sincerely,
Brooks Bradley.
Tony Moody wrote:
> Dear Brooks,
> The device you could be enquiring about is a Pressure Control Valve or
> PCV. That is a standard item and should be quite readily available a
> reasonable cost. Any reputabe pneumatic or compressed air engineer
> should be able to find the correct component in their catalogue. The
> parameters vital to sizing the device correctly are Flow Rate, Inlet
> Pressure, and Outlet Pressure which I assume would be atmospheric ie 0
> psig.
>
> If the bag inflation pressure is to be 2 atmospheres above atmospheric
> then the gauge would read about 30 psig. If you are talking about two
> atmospheres absolute pressure then the gauge would be about 15 psig.
> This point needs to be cleared up before live guineapig stage.
> Kind regards,
> Tony
>
> BROOKS BRADLEY wrote:
> >
> > Our principal problem was in finding the proper
> > continuously-relieving escape valve for the chamber proper. We
> > evaluated several off-the-shelf, and custom made commercial valves. All
> > worked to some degree, but we are, at present, testing a method whicn
> > uses only a couple of variable-diameter holes fashioned in the outer
> > fabric and reinforced against tearing. This latter approach is by far
> > the most economical. However, the downside is that the pressurizing
> > air-supply compressor system is required to supply much greater
> > quantities of air....to keep the bag properly inflated (at about 2
> > atmospheres) and to evacuate the C02 sufficiently.
> > Do remember this system uses either a conventional
> > oxygen-mask, or our "Home-Made" nebulizer system for supplying the
> > oxygen component......and a conventional air compressor (with low
> > cut-off limits) as the pressurizing source for the contained
> > atmosphere.
>
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