That will definitely work, but today I mastered the secret of pure mechanical control. When the pressure rises, indicating that the chamber is full of air and ready to reset, a pressure-relief valve releases the air from the line. This would work by itself, but poorly. My buddy Orlando was happy with this arrangement, but I see only inefficiency as the air blows uncontrollably, first out the valve, and then out the top of the chamber, whose top ball will have now fallen, perhaps even interfering with the top ball as it tries to seat itself.
The only remaining (easy) task is to come up with a circuit that will turn on a 3-way solenoid valve (or off, depending on which type of valve it is), to turn off the air pressure when the pressure switch cuts out, and then delay for a fixed length of time before resetting, to allow the top ball to fall and the chamber to refill.
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