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1/4 turn was and still is a good idea if you think there is a chance that someone checking your air doesn't know which way is on. If they turn it a 1/4 turn and it stops turning they will either know that that is what should happen or will comment that "it was only a 1/4 turn on" which should let you know that they can't tell right from left. These people can also mash the valve seat by tightning a valve when they think they are opening it. If you turn your air on all the way somday someone will turn it off for you while commenting that you forgot to turn it on. Remember, we have at least two generations of idiots out there that have never done anything as mechanical as changing sparkplugs in their car or lawnmower. Are you one of them? :') Remember - 1/4 turn back on the valve and 1/4 inch back on your buddy's drysuit zipper. Dick In message <199607142200.SAA23881@us*.in*.co*> Todd Leonard writes: > Does anybody know the real story behind the practice still taught > by some agencies of turning tank valves a quarter-turn back after > opening them all the way? I've "heard" that at one point in time > there may have been valves where this really was useful, but that > it has long since become an anachronism (and a potential point of > confusion, albeit a small one, for someone who wants to quickly > ensure their valve is on all the way). I don't turn mine back, > but on a couple of occasions some well-intentioned buddy or DM > has "checked" my air supply and turned it back before I explained > it (and in the case of the DM, just politely asked them to leave > me and my gear alone). Obviously, I'd prefer to know the whole > story before explaining to these guys why it's a stupid "rule". > > So what's the truth? Was the quarter-turn back ever a good idea? > > - Todd > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. ------------- Dick Barker dickb@es*.co* http://www.eskimo.com/~dickb/ Are you qualified to join OFDA? http://www.eskimo.com/~dickb/ofda.html San Juan Isl Dive Charter? http://www.eskimo.com/~dickb/starfire.html
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