Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid current controlled cyclic system
Patent
1995-09-06
1997-09-23
Fortuna, Ana
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid current controlled cyclic system
210 97, 210106, 210111, 2102571, 210340, 210341, 210202, 210760, 210758, 2101951, B01D 2124
Patent
active
056700385
ABSTRACT:
A filter system for a liquid, usually water, is disclosed. The system includes two filters, each having a housing and a filter medium located in the housing through which the liquid flows in one direction to be filtered. A pressure operated distributing valve alternates the flow of water from one to the other of the filters and pressure regulators and check valves or pressure regulators alone divert a portion of the filtered water to backwash the filter medium in the other filter.
REFERENCES:
patent: 3291562 (1966-12-01), Anderson
patent: 3447684 (1969-06-01), Morrison
patent: 3478883 (1969-11-01), Deluca, Jr.
patent: 3715416 (1973-02-01), Campbell et al.
patent: 3819053 (1974-06-01), Milotich
patent: 4128477 (1978-12-01), Nebolsine
patent: 4155850 (1979-05-01), Rathbone et al.
patent: 5380427 (1995-01-01), Foss
Figure 2 demonstrating solenoid-actuated automatic filter backwash, GEOFLOW, Inc., Apr. 26, 1993.
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