Air-injection cleaning system for liquid filters

Details Air-injection cleaning system for liquid filters Air-injection cleaning system for liquid filters

1978-09-27

1980-08-26

Granger, Theodore A.

Liquid purification or separation

Structural installation

Closed circulating system

210416AS, 261DIG75, E04H 316

Patent

active

042194237

ABSTRACT:
A pump and filter assembly suitable for circulating and filtering swimming-pool water is provided with a normally closed air-injection valve to aerate water flowing into a filtration element in the filter. When the exterior surfaces of the element become covered with dirt or filter cake, the air-injection valve and an auxiliary filter outlet are opened. Air aspirated through the valve into the filter inlet water stream causes a churning cleaning action which dislodges the dirt, and the debris-laden water is discharged through the auxiliary outlet without passing through the element.

REFERENCES:
patent: 3282227 (1966-11-01), Nielson
patent: 3371789 (1968-03-01), Hense
patent: 3637331 (1972-01-01), Smith et al.
patent: 3640516 (1972-02-01), Williger
patent: 3669883 (1972-06-01), Huckstedt
patent: 3738620 (1973-06-01), Ennis
patent: 3767050 (1973-10-01), Reiner
patent: 3853481 (1974-12-01), Murray
patent: 3943580 (1970-03-01), Carter
patent: 3996139 (1976-12-01), Prince et al.

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