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Originally Posted by Andrew Blair
If you look carefully at the back of the cylinders, you'll see what I imagine to be the magnetic reed switches supplied with certain cylinders. I think that as the cylinder trips the switch, you switch the pressure on the cylinders.
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That's correct, we used the magnetic pistons with reed switches. The switches are wired directly to the solenoid valves without going through a controller. It's powered off a small shop air compressor. The two 12" X 1 1/2" pistons would be way too much for the kit compressor, at least at a speed that would keep the ice cream from icing up.