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>Carl wrote:
>
>>Barrie,
>>
>>I believe that some but not all fully closed O2 rebreathers use a
>>constant mass flow valve ( or something similar ) to automatically add
>>O2 to the breathing loop.  You will then either vent or be required to
>>flush the bag at some point.
>
>Mixup in terminology - some of the SEMI closed circuit rebreathers
>have a constant mass flow valve.  They vent gas on a more continuous
>basis.  Fully closed circuit rebreathers only vent when you purge the
>loop or rise in the water column enough that the loop is full (but
>you'd most likely dump gas from the loop before that to control your
>bouyancy).

You have a point about being "fully closed" however I believe that some 
pure O2 rebreathers do use a constant mass flow valve or something similar
to add pure O2 to the breathing loop.  

Barrie Kovish
Vancouver

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