Quote:
Originally Posted by EthanMiller
My team tried that, but it seemed air escaped, although for the life of me I don't know why. This is second hand, though. Feel free to pull out a hose and try it - it won't break anything.
As long as you unplug the hose when there's no pressure.
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You will hear air coming out of the open port when the piston moves towards the open port and entering the port when the piston moves away from it.
If air is actually constantly leaking out of the open piston port I believe that the piston is broken as that sounds like a bad internal seal.
Regarding the original question, this is perfectly legal:
http://forums.usfirst.org/showthread.php?t=14218
Eric, it is often desirable to simply vent one port of a cylinder if it will already be returned by other means in order to save air. Our 2008 robot vented the retract port of our arm raising cylinder through a flow control valve and let gravity bring it down.