Arrangement for containing filter contaminant; assembly; and, methods
AssigneeDonaldson Company, Inc.
InventorsJohan Fobe, Julien Dils
Life of this patent
Estimating the term…
Abstract
A filter cartridge including a liner/valve, or support/valve construction is provided. The liner/valve construction provides for contaminant flow to the filter media during normal filtering operation, and contaminant or sediment retention in the cartridge during a servicing operation. The preferred liner/valve construction includes an outer support having a flexible sheet valve positioned therein. The preferred sheet valve includes a plurality of cut valves. Methods of construction, assembly and use are provided.
Claims29
1-23. (canceled)
A filter cartridge comprising:
- (a) an extension of filter media having an upstream surface and defining an internal volume;
- (b) an liner/valve construction positioned along the upstream surface of the filter media;
- the liner/valve construction including:
- (i) a support defining an interior and having at least a first aperture extending therethrough;
- and,
- (ii) a flexible valve sheet operably positioned within the interior of the support between the support and the extension of filter media, with an upstream surface of the valve sheet directed toward the support;
- the flexible valve sheet including at least one deformable valve member oriented adjacent the first aperture, said valve member being deformable between:
- (A) a first, open, orientation caused by a first opening fluid pressure against the upstream surface of the flexible valve sheet to allow contaminant flow through the liner/valve construction and to the filter media;
- and
- (B) a second, closed, orientation to inhibit loss of contaminant from the filter cartridge;
- when fluid pressure against the upstream surface of the flexible valve sheet is below the first opening pressure.
A method of forming a liner/valve construction for a filter cartridge;
- said method including steps of:
- (a) curling a flexible valve sheet;
- and,
- (b) positioning the flexible valve sheet inside of a porous tubular support.
Dependencies are inferred from the claim text.