| 摘要 |
Filter apparatus adapted to be operated according to either a filter mode or a self-cleaning mode comprises a housing having a filter body including a plurality of filter elements which are adapted to be pressed together during the filtering mode of operation, and spread apart during the self-cleaning mode of operation; a drive for moving the filter elements apart; and differential pressure control means sensing the difference in pressure between the upstream and downstream sides of the filter body, and effective, in response to sensing a differential pressure exceeding a predetermined value, to initiate a self-cleaning mode of operation by closing a first valve between the downstream side of the filter body and the clean fluid outlet, opening a second valve between the upstream side of the filter body and the dirty fluid outlet, and actuating the drive to permit the filter elements of the filter body to move apart.
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