I can get by with the hydraulics stuff but I still have a lot to learn. From what I understand the differences between single action and dual action thus far would be: Single action: provides force in one direction only. So say you have a lift cylinder for a front end loader that was a single acting cylinder it would have pressure fed to it to lift. But when the control valve was put in the down position it would only return on basically the front end loaders weight. Never applying down pressure? With dual action you would have lifting capability and also downward pressure?