Patent ID: 6607661
Filing Date: 2003-08-19
Classification: B01D

Abstract:
Filtering apparatus comprising two parallel filter housings, where alternate flushing and filtering stages are provided, each housing being defined by an openable casing and having at least one filter element contained in the housing; and each housing being provided with an inlet for liquid flow to be filtered, an outlet for the filtered liquid flow, and an air channel, for recurring filtering stages in the housing and cleaning of the housing and the at least one filter element contained therein by flushing with air between the filtering stages; the filtering apparatus further comprising a spindle for operating the filtering stages in alternation in said two parallel filter housings, the spindle working as a valve for connecting the inlet and outlet of each of the housings in turn to common inlet and outlet channels for the liquid flow, and each of the housings having a separate first filling channel segment and a separate second filling channel segment for prefilling the other housing with filtered liquid before a subsequent filtering stage is initiated therein after a flushing stage, the first filling channel segment for housing extending from the respective outlet for the liquid flow through the respective casing, the second filling channel segments being connected to each other, each of said first and second filling channel segments being provided with a separate valve for blocking flow between the respective first and second filling channel segments when the cover is removed from the respective housing.