Your conservative approach to gas pressures is intelligent, but rare. I find that students and artists who have the experience to know better almost always use far more pressure than necessary, particulaly oxygen. And turning up the oxygen pressure is generally the only thing anyone tries when they have a problem cutting---no metal cleaning, tip cleaning, preheating the metal, changing travel speed, etc. Just crank up the oxy.
Opening the valve all the way only applies to high pressure bottles, not to acetylene or other fuel gases which are supplied at 100's of psi rather than 1,000's. High pressure gases are supplied in bottles which have valve seats at both the top and bottom of the valve stem. The one at the bottom seals the bottle, and the one at the top seals the valve against leaking when it is open, as you noted. Traditionally, acetylene valves are opened only 1/4 to 1/2 turn so that they can be shut off quickly if there is a problem with a flame where there shouldn't be one.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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