Quote: (Originally Posted by Sutty)
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.
The other issue is that the valves would really have to be positioned right next tro each other.. haveing the valves too far apart are no better than having just one valve.. The further they are apart the greater the dead air spaces..
With flapper valves in the DSV, and proper training, a failed flapper valve is nothing to worry about.. Its time to abort the dive, but with the proper actions the loop is still usable..