Patent ID: 6706198
Filing Date: 2004-03-16
Classification: B01D

Abstract:
A method of filtering liquid comprising:directing liquid to be filtered into a housing of a filter element assembly, said housing including a lid; causing said liquid to be filtered to pass through a plurality of spaced openings formed in a generally circular inlet plate of said filter element assembly and into an annular space formed between first and second cylindrical filter sleeves permanently affixed at one longitudinal end thereof to said inlet plate of said filter element assembly, said filter sleeves formed of flexible bag filter type filtration media, said second filter sleeve having a cross-sectional diameter less than the cross-sectional diameter of said first filter sleeve and forming a cylindrical space interiorly of said second filter sleeve, said liquid to be filtered entering said annular space at one longitudinal end thereof through said at least one opening; closing a central area of said inlet plate corresponding to the area of said cylindrical space thereby capping said cylindrical space and preventing any flow of unfiltered liquid into said cylindrical space to bypass said filtration media, whereby all liquid entering said housing is filtered by said sleeves; preventing the flow of liquid to be filtered from said annular space except through said first and/or second filter sleeves to thereby effect filtration of impurities or particles from said liquid; and permitting the flow of filtered liquid from said cylindrical space out of said filter element assembly.