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Re: Mulit-postioning with pnuematics this year?
Actually, all solenoids need imput pressure in order to function. Solenoid valves themselves work just like cylinders, they use air pressure in order to shift the flow of the air, so every solenoid valve needs at least 25 - 30 psi in order to work. Some, however, have an additional port in which to supply pressure for the solenoid to function separate from working off the imput pressure - these are common in systems that carry negative pressure (vacuum).
The easiest method for multi-positioning is simply using one dual solenoid, three position valve in which the center position is all ports blocked, with this you can make the cylinder move whichever direction you want by activating each solenoid, or you can make it stop anywhere by not activating either solenoid. We had this on our hook cylinder last year and it worked flawlessly.
I can draw up a schematic of it later today if you want me to.
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