Patent ID: 7905088

Claim:
A hydraulic system for a machine and having an energy recovery apparatus, said hydraulic system comprising: a supply conduit conveying pressurized fluid; a return conduit conveying fluid to a tank; first and second cylinders mechanically connected in parallel to operate a component of the machine and each having a first chamber and a second chamber; a cylinder separation control valve in fluid communication with and controlling fluid flow between the first chamber of the first cylinder and the first chamber of the second cylinder, wherein a node is formed between the first chamber of the first cylinder and cylinder separation control valve; a control valve assembly having a first workport and a second workport, the first workport being connected to the node, the second workport is connected to the second chambers of both the first and second cylinders, and wherein operation of the control valve assembly connects each of first and second workports selectively to the supply conduit and the return conduit; an accumulator; and a recovery control valve directly connected to both the accumulator and the first chamber of the second cylinder.