A hydraulic circuit powered by a direct drive, reversible hydraulic power source having a hydraulic liquid reservoir, and two input/output ports for introducing pumped hydraulic liquid into a volume input leg and for pumping hydraulic liquid from a volume output leg of the hydraulic circuit, the volume input and output legs of the hydraulic circuit being determined by the direction of hydraulic liquid flow in the hydraulic circuit, comprising,
- a) a combination of drive coupled, driven and driving, dual, reversible hydraulic motors having a common hydraulic input/output plenum hydraulically communicating with the reservoir, mechanically coupled for driving a winding/unwinding system translating a structure, the driven and driving, dual, reversible hydraulic motors being hydraulically coupled between the respective liquid volume input and output legs of the hydraulic circuit, the driving reversible hydraulic motor receiving input liquid from the volume input leg of the hydraulic circuit, outputting liquid to the common hydraulic input/output plenum, the driven reversible hydraulic motor receiving and pumping liquid from the common hydraulic input/output plenum, outputting liquid into the volume output leg of the hydraulic circuit,
- whereby initial excess discharge liquid volume output from the driving reversible hydraulic motor into the common hydraulic input/output plenum exceeding liquid volume input pumping demand of the driven reversible hydraulic motor flows to the reservoir, and as rotation of the driven, reversible hydraulic motor accelerates to a point where its liquid volume input pumping demand exceeds the discharge liquid volume output from the driving reversible hydraulic motor additional liquid make up volume is hydraulically drawn from the reservoir, in combination with,
- b) a dual, coupled check valve having:
- a manifold hydraulically coupled between the liquid volume input leg and liquid volume output leg of the hydraulic circuit defining a translation passageway having a mid-passage drain hydraulically coupled to the reservoir, where each end of the translation passageway has an angled annular valve seat opening to a larger diameter plenum,
- a check valve ball located within each large plenum at each end of the translation passageway, and
- a translating rod having a length greater and a circumferential diameter less than that of the translation passageway located in the translation passageway for preventing the respective check valve balls from simultaneously seating on the valve seats at the respective ends of the translation passageway,
- whereby, hydraulic liquid pumped from the direct drive, reversible hydraulic power source seats the check valve ball on the particular valve seat at the end of the translation passageway in the plenum on the volume input leg of the hydraulic circuit and translates the translating rod in the translation passageway preventing the check valve ball in the plenum on the volume output leg of the circuit from seating on the valve seat at the other end of the translation passageway, allowing hydraulic liquid input to the direct drive, reversible power source from both the volume output leg of the hydraulic circuit and the reservoir, and allowing excess liquid in the volume output leg of the circuit to flow to reservoir.