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Marc Dufour <emdx@ac*.ne*> wrote: >What the hell is SO DIFFICULT with making a SIMPLE 1/4 turn valve??? >Gee, railroads have been using them on air brake couplings for the >last century! And they're intuitive (not to mention touch-feelable): >in line with the pipe, it's OPEN, perpendicular to the pipe, it's >CLOSED. Why bother with zillion-turn valves that have to be either >OPENED or CLOSED???? Heat of pressurization. According to an IANTD textbook, "rapid pressurization to 2000 psi will generate a gas temperature approaching 1600 degrees F". If you're doing this with pure oxygen, the next thing that happens is often an oxygen fire and explosion, and this is why quarter-turn ball valves are banned from such applications. With lesser percentages of oxygen, you might be off the hook for such dire consequences, but the smashing you'd be giving to the HP seat in your regulator and to other components might not help them last terribly long. One regulator technician tells me that letting pressure build up relatively slowly in a regulator rather than quickly cranking the valve open reduces wear quite a bit. For high-pressure applications, slow-opening valves are recommended. -- Anthony DeBoer http://www.onramp.ca/~adb/ adb@he*.re*.or* (here) adb@ge*.co* (work) #include "std.disclaimer"
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