Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1999-03-02
2000-10-31
Savage, Matthew O.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210108, 210116, 210335, 210411, 210427, B01D 2966, B01D 3512
Patent
active
06139727&
ABSTRACT:
A self-cleaning filter is provided for filtering particulate from a fluid flow stream such as water used in an irrigation system or the like, wherein a segmented filter element is backwashed or flushed clean in response to cyclic on-off supply of fluid. The self-cleaning filter comprises a filter housing having inlet and outlet fittings for in-line connection along a water supply conduit at a location downstream from a system on-off valve. The segmented filter element is supported within the filter housing, with a first filter segment aligned with an inlet port for filtering water. When the water supply is turned on, filtered water passing through the first filter segment initially backwashes through a second filter segment with increasing line pressure to flush prior-collected particulate thereon through a flush port. When the line pressure reaches a predetermined level, a normally open and pressure responsive flush valve closes the flush port. Thereafter, with further increased line pressure, a pressure responsive outlet valve opens an outlet port to permit flow of filtered water through the housing outlet fitting. When the water supply is turned off, a pressure responsive index mechanism rotates the filter element for reversing the positions of the first and second filter segments relative to the inlet and flush ports, so that water is filtered by the second filter segment and particulate is flushed from the first filter segment when the water supply is next turned on.
REFERENCES:
patent: 2237964 (1941-04-01), Haught
Anthony Mfg. Corp.
Savage Matthew O.
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