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Rod wrote: >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. Sorry to keep beating this into the ground but: I'll assume that what you say about the relationship between the CCR1000 and the Mark 15 is correct. This was my understanding too. The following is from memory of the gas wiring diagram of the CCR1000. If you are standing at the bottom and above the unit then somewhere on the right hand side (plumbed into the O2 supply) is a flow restrictor. It's part of a T in the oxygen line. The flow restrictor is probably not very big, probably looks like a standard gas fitting. The line leading into the flow restrictor contains a filter which needs to be periodically replaced. The CCR-1000 manual states that this filter prevents the flow restrictor from becoming clogged. The flow restrictor takes in 120 psi and outputs 4 liters/minute of O2. This is what I'm guessing is the constant mass flow valve. After the flow restrictor the O2 enters an accumulator and then is gated throught the solenoid. I tried contacting Biomarine on this issue but did not get an answer (and I'm still waiting for a *#$% parts and price list from them because we wanted to use thier mouth pieces ). Note that a constant mass flow valve is very small and has no moving parts. Barrie
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