Patent ID: 6224758
Filing Date: 2001-05-01
Classification: B01D,F01M

Abstract:
A filter arrangement for a liquid to be filtered, comprising a filter housing, a center tube through which liquid can flow arranged centrally in said housing, and an annular filter cartridge disposed around said central tube; said housing having an inlet opening outside said filter cartridge and an outlet opening from said center tube, whereby liquid to be filtered can flow from said inlet radially inwardly through said cartridge and into said center tube and thence out said outlet; said filter arrangement further comprising a normally closed bypass valve communicating between the outside of said filter cartridge and inside said center tube through which the liquid can pass directly inside said center tube if said filter cartridge becomes clogged; said bypass valve comprising an annular diameter constriction formed in said center tube, a valve body disposed in said diameter constriction, axially extending supports arranged in said central tube behind said diameter constriction, said supports defining a recess in which said valve body is received, a valve spring disposed between said valve body and said supports, and a valve plate inserted after said valve spring and valve body and durably affixed adjacent said diameter constriction such that the valve spring urges a valve seat on the valve body against the valve plate.