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Re: Position control of pistons with simple solenoids
A closed centre valve is a good solution to your problem, however beware R89 which requires a pressure vent plug to release all stored air. With a closed centre pressurised air would remain trapped in your cylinder.
In the past I think there have been rules saying something along the lines that if a mechanism could generate pressures higher than 60 psi (by an external force) you would have to have a way to relieve that pressure. I don't see that in the 2016 rules, but beware.
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