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Barry wrote:

> > I'd be interested to know if anyone can confirm or deny the existence of 
> > a cmfv in the CCR-1000 or any other electronic rebreather.  The problem 
> > with a cmfv of course is the potential to become plugged.  If it did, one 
> > might hear the solenoids clicking happily away and not adding any gas to 
> > the system what so ever.

It is my understanding that the CCR1000 is the commercial version of the 
Mark 15. If this is correct, then there is no cmfv but rather an 
electro-mechanical solenoid that- at a pO2 lower than the set point- 
admits a pulse of 1/3 liter of O2. The amount of oxygen that is admitted 
when the valve opens is constant and independent of depth. The pulse of 
oxygen comes from a small accumulator that is pressurized with gas at a 
contolled pressure (by the first stage regulator) of 110 psi above 
ambient. Rod 


> 
> I'd be interested in knowing about other rebreather designs as well. From 
> my experience, there is a substantial audible difference between a 
> solenoid injecting O2 and a solenoid that is "dry clicking".  You would 
> notice this difference even if you were very distracted.
> 
> Aloha,
> Rich
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