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Mr, Decker, THe "point" i was referring to was what exactly does the h/y valve do for you? whats the most likely failure, free flow or no gas? sure you can isolate one first stage, but how do you save your gas while your doing it? doubles you isolate, saving half your supply, and then shut down the problem side. what happens when you shut off the wrong side on you h/y valve? best case you lose extra gas while figuring it out right? worst case.........? Another thing, if the h/y is about redundancy for moderate deep or overhead dives on a single, what kind of gas management are you doing? I can dive for a while on a single tnk, but id need a 160 to do 40 min bt at 120+ and stay w/in thirds.< put the calculators down my water is cold at 120.> The other thing that mystifies me with this whole thread is, exactly how paranoid about the tables are you guys? if you are so deathly afraid of bending on a "no deco" dive, what kind of faith can you possibly have in the numbers for planned deco? < metaphorical you, not Bob Decker personally> Finally while I do value the opinion of Messers Irvine and Jablonski along with your own, I have three personal emails from Bill Mee about the h/y valve dated about three years ago which indicate otherwise. Since they were private messages i am naturally restrained from sharing them. His major point was this isnt real redundancy, you dont even need real redundancy for this type of depth and the drag outweighs the utility. rgds, Al Marvelli RDecker388@ao*.co* wrote: > In a message dated 6/24/00 4:46:00 AM Eastern Daylight Time, > ajmarve@ba*.ne* writes: > > > I dont see the point of an h valve, i either dive doubles or i dive > singles, > > if > > i cant use the single i use the doubles. I had a y valve but it never > really > > worked like i wanted it to. > > Al, > > H-valves provide a bit of redundancy for folks doing non-technical > penetrations into wrecks, caverns, etc. (A much better option for these > divers than carrying a pony bottle which results in more drag and are seldom > used properly anyway). They also serve as a nice transitional tool for divers > with an interest in pursuing a more serious level of diving but not quite > ready to make the move based on experience levels. Then there's also the > consideration that use of an H-valve allows one to use the same regulator > systems, and a similar configuration, whether diving a single or double tanks. > > As I understand it one of the key points of DIR, and an attitude embraced > by many non-DIR divers as well, is that one takes only what they need to > accomplish a particular dive into the water. For a little 120/130 fsw dive > for 40 minutes or so, resulting in a short deco obligation, a single tank > loaded with a light trimix and a small sling bottle of 50/50 would be all > that was really needed. It should be obvious that an H-valve, combined with > a good dive partner, would provide the level of redundancy required for such > a dive. > > Finally, I seem to recall either Trey, JJ or both suggesting the use of > an H-valve as the DIR approach to single tank diving. I could be wrong but > I'm realitively confident that is the case. > > Bob Decker > SportDiverHQ.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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