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On Wed, 23 Dec 1998, Ken Sallot wrote: > Rich, > > Knowing nothing about ccr's, would the below quoted thing be a > problem at 100m a mile back in a cave with poor visibility? No. > "Jim Brown and Jason Mallinson re-assemble a"sticky" oxygen cut-off > switch that now works smoothly." > > What does this mean? Cut-off switch? Sticky? If it sticks, what > happens? Can you explain this for me? The valve in question is the "quick" cut-off valve for the O2 supply to the solenoid (I know of no other rebreather which has such a safety feature). It's purpose is to allow the diver to immediately disable the O2 supply to the solenoid, in the event that the solenoid jams in the open position (in thousands of hours of testing on this solenoid valve, it has *never* once failed open). I assume their use of the word "sticky" meant that this valve still worked fine, but was a bit stiff to turn (it's designed to be a one-handed operation, yet not allow itself to be bumped off inadvertently). Even if this valve stuck entirely (which it hadn't, nor ever has to my knowledge), there are still two other valves that a diver can turn quickly (using only one hand) that would immediately disable the O2 supply to the solenoid (on most CCR's, the only way to do this is to turn off the O2 cylinder valve). The "sticky" valve does have one other function, which is to route O2 to the OC bailout regulator. Obviously, this is something which you wouldn't want to do accidently (which is why that position of the valve requires a very conscious two-handed operation). Also, obviously, this is a feature that is irrelevant to the Wak2 divers. Hope that answers your questions. Aloha, Rich P.S. Again, I nixed the cavers address from the CC list. Please forward this on to that list for me. Thanks. Richard Pyle Ichthyology, Bishop Museum deepreef@bi*.or* 1525 Bernice St. PH: (808) 848-4115 Honolulu, HI 96817-2704 FAX: (808) 847-8252 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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