Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1976-04-08
1977-01-25
Adee, John
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210138, 210332, B01D 3522
Patent
active
040050130
ABSTRACT:
A filtration system which may include multiple filters capable of being individually washed of clogging filtrate material by a "blow-down" or flushing operation, is regulated by a blow-down controller device. Each filter has a blow-down discharge valve which is normally maintained closed by a required level of fluid pressure in a pilot line connected to the valve. This pressure is supplied by the controller device, which draws pressure from an inlet line feeding all the filters. When the controller relieves pressure in one of the pilot lines, the filter associated with that pilot line is subjected to blow-down for a predetermined time period. To determine when blow-down of one or more filters is required, the controller senses pressure differential between the common inlet line and a common filter outlet line. When the pressure differential reaches a certain level, it indicates that the filters are sufficiently clogged by filtrate to require blow-down. The controller initiates blow-down in one or more of the filters sequentially, returning to the sensing mode after each blow-down cycle, until the pressure differential drops below the level indicative of the need for cleaning.
REFERENCES:
patent: 2183075 (1934-12-01), Hughes
patent: 2828017 (1958-03-01), Ronningen et al.
patent: 3388799 (1968-06-01), Rymer
patent: 3422956 (1969-01-01), Hadden
Adee John
Reed Irrigation Systems
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