Patent ID: 6893555
Filing Date: 2005-05-17
Classification: B01D,Y10S

Abstract:
1. A filter unit for the filtration of a pressurized liquid comprising: a closed housing made from a plastic material with a one end and an other end; an inlet for liquid to be filtered and a main outlet for liquid which has been filtered, each formed in the one end of the housing; a second outlet for liquid which has been filtered formed at the other end of the housing which second outlet is adapted for attachment to a return pipe; a main filter element arranged in the housing and having an unfiltered fluid surface exposed to the majority of the liquid flow supplied under pressure to the housing inlet, flow through the main filter being directed to the main outlet from the housing; a secondary filter element having an unfiltered fluid surface exposed to a portion of the liquid flow supplied under pressure to the housing inlet, flow through the second filter being directed to the secondary outlet from the housing; wherein the main filter element offers a low resistance to the flow of fluid the relative to the secondary filter element so that the majority of the flow through the inlet is filtered by the main filter element and the remainder by the secondary filter element; wherein the housing is generally cylindrical, the main filter element is adjacent the one end of the housing and is cylindrical with a diameter slightly less than the housing, and the unfiltered fluid surface thereof is disposed toward the curved surface of the housing; and wherein the housing is a sealed unit and the entire filter unit is replaceable.