Quote:
Originally Posted by Al Skierkiewicz
Does not the regulator vent to maintain low side pressure?
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Al's channeling Yoda
The only type of pneumatic system that doesn't use air would be along the lines of using the air as a spring - such as a pneumatic shock. You would have to use a motor to then wind a load back against the air.
You can't get something for nothing. It's thermodynamics.