I can tell you that in Scubapro like valves there is no reason to back off 1/4 turn. Orings do all the work when the seat is backed off of the orrifice. I like to have my valves all the way open against the stop. If shit hits the fan and I need to shut a valve down I only want it to turn one way and that is off! I guess that is why we do the valve drill before each cave dive... Jeff
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