If you use separate solenoid valves for each side, or use a 3-state solenoid valve with blocked ports in the middle state, and had some limit switches, you could actuate the "return" stroke pneumatically using much less air (probably 75-80% less) than the power stroke.
The time for the power stroke is the biggest problem. You'd probably be better off with two 18" stroke cylinders mounted to each other, pointing in opposite directions and pressurizing them through different solenoid valves. The returns could be through one solenoid valve.
Quote:
Originally Posted by JesseK
60 PSI * cylinder volume = 120 PSI * stored volume
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Not quite, you need to add atmospheric pressure to both sides. The high pressure tank only holds about 80% more air than the low.