Filter

Details Filter Filter

1977-09-12

1979-02-13

Lander, Ferris H.

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

With rehabilitation means

210290, 220 85B, B01D 2324

Patent

active

041394739

ABSTRACT:
An upwash, upflow, graded sand filter has a reusable imperforate diaphragm on the top of the graded filter media and an inlet for pressurized fluid above the diaphragm for inflating the diaphragm against the media during filter stage. The filter housing is flared upwardly and outwardly at selected portions to reduce the velocity of upflowing liquid during wash stage for improved grading of the filter media. A natural foraminous layer may be self-grading at the top of the filter media, allowing a circumferential outlet for filtrate. A layer of fine, dense filter media may also be used to increase the size range of media particles in the filter. Special diaphragms may be composed of individual leaflets that float above a dirty-liquid outlet during wash stage, but that sink due to a change in density when the filter is pressurized for filter stage.

REFERENCES:
patent: 2098903 (1937-11-01), Slidell
patent: 3126333 (1964-03-01), Williams
patent: 3387630 (1968-06-01), Routson
patent: 4001113 (1977-06-01), Schoenrock et al.
patent: 4048068 (1977-09-01), Hirs

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