Liquid purification or separation – Processes – Separating
Patent
1980-01-28
1981-08-04
Adee, John
Liquid purification or separation
Processes
Separating
210108, 210410, 210412, 210436, B01B 2940
Patent
active
042821053
ABSTRACT:
Disclosed is an improved liquid filter in which contaminated liquid is pumped into an inlet chamber, through a filter element, into an outlet chamber and out of the filter through an outlet pipe. The inlet and outlet chambers have compartments which hold compressed air. When the filter element becomes clogged with contaminants, inlet and outlet valves are closed, sealing off the filter. A vent valve is then opened to quickly exhaust the compressed air in the inlet air compartment. This allows the compressed air in the outlet air compartment to energetically force liquid back through the filter element thereby dislodging the deposited contaminants. The compartments and a liquid column between them are sized so that a discharge of liquid from the inlet compartment during the venting thereof is prevented. Both air compartments are kept full of air regardless of the internal filter pressure by continuously bleeding air into the inlet air compartment from where excess air bleeds into the outlet compartment to assure sufficient backwashing air and air pressure under all operating conditions. The filter has a tangential inlet nozzle which facilitates the removal of heavier contaminants before they reach the filter element.
REFERENCES:
patent: 2423172 (1947-07-01), Booth
patent: 2468603 (1949-04-01), Pew
patent: 3056499 (1962-10-01), Liddell
patent: 3088595 (1963-05-01), Robb
patent: 3280978 (1966-10-01), Scott
Adee John
J. R. Schneider Co. Inc.
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