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Claim 1

A FILTER FOR REMOVING SEDIMENT FROM OIL DELIVERED THERETO UNDER PRESSURE FROM A SUMP, COMPRISING IN COMBINATION, A BASE MEMBER HAVING A GENERALLY HOLLOW INTERIOR FORMING A DISTRIBUTION CHAMBER AND INCLUDING AN INLET OPENING AND AN OUTLET OPENING ADAPTED TO BE CONNECTED TO AN OIL LUBRICATED DEVICE, A FILTER CASING CONNECTED TO SAID BASE, A VERTICALLY DISPOSED INLET CONDUIT PASSING THROUGH SAID DISTRIBUTIION CHAMBER AND INCLUDING AN ENLARGED END PORTION HAVING A VALVE SEAT THEREIN FOR DELIVERING OIL TO SAID CASING FROM THE SUMP, AN OUTLET CONDUIT EXTENDING THROUGH SAID DISTRIBUTION CHAMBER FOR DELIVERING OIL FROM SAID CASING TO THE SUMP, A FULL-FLOW ELEMENT AND A PART-FLOW ELEMENT OF CYLINDRICAL FORM, EACH HAVING A CENTRAL BORE AND BEING AXIALLY ALIGNED WITHIN SAID CASING, EACH OF SAID ELEMENTS HAVING AN OUTER PERIPHERY SPACED FROM SAID CASING TO PERMIT THE FLOW OF INLET OIL INTO SAID CASING AND THEREFROM RADIALLY THROUGH SAID FILTER ELEMENTS TO THEIR SAID CENTRAL BORES, SAID CENTRAL BORE OF SAID FULL-FLOW ELEMENT BEING DISPOSED ADJACENT THE INLET OPENING OF SAID DISTRIBUTION CHAMBER TO PERMIT FLOW OF OIL FROM AID FULL FLOW ELEMENT DIRECTLY TO SAID DISTRIBUTION CHAMBER, AN IMPERFORATE TUBE EXTENDING FROM SAID BASE INTO SAID CASING THROUGH THE CENTAL BORES OF SAID FILTER ELEMENTS AND HAVING A PERFORATE PORTION COMMUNICATING WITH SAID PART-FLOW ELEMENT TO PERMIT FLOW OF OIL FROM SAID PART-FLOW ELEMENT TO SAID OUTLET CONDUIT, FIRST PRESSURE OPERATED VALVE MEANS DISPOSED WITHIN SAID DISTRIBUTION CHAMBER FOR BY-PASSING OIL FROM SAID INLET CONDUIT DIRECTLY TO SAID DISTRIBUTION CHAMBER, SECOND PRESSURE OPERATED VALVE MEANS DISPOSED WITHIN SAID DISTRIBUTION CHAMBER FOR BY-PASSING OIL FROM SAID DISTRIBUTION CHAMBER DIRECTLY TO SAID OUTLET CONDUIT, A RETAINING MEMBER DISPOSED WITHIN SAID FILTER CASING PARTIALLY CLOSING THE ENLARGED END PORTION OF SAID VERTICALLY DISPOSED INLET CONDUIT AND DEFINING A CONFINED CHAMBER THEREIN, AND AND UNBIASED BALL DISPOSED WITHIN SAID CONFINED CHAMBER AND MOVEABLE THEREIN IN RESPONSE TO THE FLOW OF OIL THROUGH SAID INLET CONDUIT, SAID BALL ENGAGING SAID VALVE SEAT TO PREVENT OIL FROM FLOWING OUTWARDLY OF SAID FILTER CASING UPON A REDUCTION IN THE PRESSURE OF THE OIL FLOWING THROUGH SAID INLET CONDUIT.