Another idea to get bellows effect without the one. We can make the kind of the hermetic cylinder with a baloon inside. The baloon is supplied with any air source (for example airturbine) controlled wit rorary valve powered with the stepper motor. The lenght of inspiration and exhaust we can controll via assymetric roll controll.
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Adjustable piston, smaller than the diameter of the pipe. The balloon will rest on it and the air will fly past the piston. If we put a sensor on it, we will know the pressure. Flow rate - diameter x length x filling time
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