Rebreather World - View Single Post - Why not redundant one-way valves?

Sutty · 4th January 2006, 20:08

Quote: (Originally Posted by decoweenie)

Sorry, IMHO, there isn't enough volume to breath normal full breaths as you have stated.

And as soon as I can't breath normal full breaths, I would know something isn't right.

500ml is the volume of a single hose - I measured it before posting, no reason why you would be unable to take a full breath as the deformable part of the circuit (counterlungs) is still attached, just with a huge dead-space.

Caveseeker/Joe: I can accept that the design of a valve can have a huge affect on WOB, but once you have it right would having 2 make so much difference? Resistance to gas flow is Hugely affected by diameter (ie 16X (if I remember right) the resistance by halving diameter of tube (admittedly these are not simple tubes), so a small diameter valve will cause problems, but 2 large diameter ones much less.

4th January 2006, 20:08	#9 (permalink)
Sutty Classic Kiss diver Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Jun 2005 Location: Glossop, Derbyshire, UK Posts: 784	Re: Why not redundant one-way valves? Quote: (Originally Posted by decoweenie) Sorry, IMHO, there isn't enough volume to breath normal full breaths as you have stated. And as soon as I can't breath normal full breaths, I would know something isn't right. 500ml is the volume of a single hose - I measured it before posting, no reason why you would be unable to take a full breath as the deformable part of the circuit (counterlungs) is still attached, just with a huge dead-space. Caveseeker/Joe: I can accept that the design of a valve can have a huge affect on WOB, but once you have it right would having 2 make so much difference? Resistance to gas flow is Hugely affected by diameter (ie 16X (if I remember right) the resistance by halving diameter of tube (admittedly these are not simple tubes), so a small diameter valve will cause problems, but 2 large diameter ones much less.
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