公开(公告)号：US06524471B2

公开(公告)日：2003-02-25

申请号：US09796910

申请日：2001-03-01

Applicant: James Youngers

Inventor： James Youngers

IPC: B01D35143

CPC classification number: B01D37/04 ,  B01D29/668 ,  B01D2201/54

Abstract: A filter unit in a fluid circuit associated with a machine tool that uses machining fluid is maintained by counting the number of times the machine tool is operated and automatically servicing the filter unit, as by backflushing, after the machine tool has been used a preset number of times. A filter unit control unit counts the number of uses of the machine tool and moves valve units in the filter unit from an operational configuration to a backwash configuration and controls the timing and operation of the filter unit maintenance cycle.