Patent ID: 7559732

Claim:
A refuse vehicle including a lifting arm mounted on a side of the vehicle, said arm having a grabber mechanism that grips a refuse container on the ground, a refuse storage body including a packer that pushes refuse towards a rear door to compact the refuse, said rear door upon being opened, and the body tilted, allows compacted refuse to be discharged, a hoist for tilting said body, a first positive displacement pump with an associated first valve system in fluid communication with a first drive mechanism that operates the packer, the rear door, and the hoist, a second positive displacement pump with an associated second valve system in fluid communication with a second drive mechanism that operates the lifting arm, said first and second valve systems each including at least one closed-centered valve with a spool mechanism having a pressure compensator to maintain a constant flow rate of fluid through the valve regardless of differential in pressure across the valve for any given position of the spool mechanism.