US Patent 7775854 Water jet machining with abrasive recovery and filtration

A continuous flow recirculating jet machining system incorporates a dynamic particle separator downstream of the fluid collection reservoir, for directing the water or other liquid in a serpentine path to promote separation of larger-diameter particulates. A filter bank downstream of the dynamic separator removes fine particles in several stages, providing several alternative fluid flow paths at each stage to facilitate filter replacement and other maintenance at each stage without interrupting system operation. The system further can incorporate a settlement tank between the dynamic separator and the filter bank to separate larger and intermediate sized particles upstream of the filter bank.