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When I was working on this similar problem I was planning on using double acting cylinders with a single two position 4 way solenoid valves for positive pressure on both actions. Then, using your suggestion, a spring holding it up in case of system failure. Theses solenoid valves around 60 dollars US, making it the most expensive part of the system. I also bought a variable pressure regulator to make better use of the tanks volume and allow the force and speed to be dialed in. You probably already have thought about this stuff, but that’s my two cents. It gets complicated fast.
Brock
Oregon Commuter guy
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