Patent ID: 8511325

Claim:
A waste container washing vehicle comprising a clean water reservoir; a container washing compartment having a plurality of water nozzles arranged for washing a waste container positionable therein; a grey water reservoir which receives water previously used by the nozzles during waste container washing; and a water pumping circuit interconnecting both the grey water reservoir and the clean water reservoir to the water nozzles and operable to pump water to the nozzles selectively from either one of the grey water reservoir and the clean water reservoir; wherein a waste container positioned in the washing compartment can be washed with a two-phase cycle, a first phase during which water is pumped to the nozzles from the grey water reservoir, and a second phase during which water is pumped to the nozzles from the clean water reservoir, wherein the water pumping circuit comprises a double-action pump having a first and a second separate cylinders, each cylinder having two longitudinally opposite ports, one at each end thereof, and each cylinder having a corresponding piston slidably engaged therein; both pistons being interconnected for common sliding displacement in and relative to the cylinders; the pistons being selectively hydraulically displaceable in two longitudinally opposite directions by selective feeding of hydraulic fluid in a first one of two opposing ones of the ports during emptying of hydraulic fluid from a second one of the two opposing ports, thereby pumping grey water and clean water respectively in and out through a grey water one and a clean water one of the two other opposing ones of the ports, and vice versa by feeding of hydraulic fluid in the second one of the two opposing ports.