Gravity flow filter with backwash control chamber

Details Gravity flow filter with backwash control chamber Gravity flow filter with backwash control chamber

1992-08-28

1994-02-22

Drodge, Joseph W.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210126, 210275, 210278, B01D 2414, B01D 2446

Patent

active

052883990

ABSTRACT:
A gravity flow, single or multi-cell filter incorporating an integral backwash control chamber for enabling backwashing to occur without the need for backwash pumps. The backwash control chamber contains a volume of backwash liquid, and communicates with a source of pressurized backwash liquid through a float-controlled flow control valve in order to maintain a desired liquid level within the backwash control chamber during backwashing operations. The flow of backwash liquid from the backwash control chamber is controllable either by means of three-way valves interconnecting the backwash control chamber with the filter outlet chamber, or by wash water control gates within the backwash chamber that are adapted to selectively cover outlet openings to permit backwash flow to enter the filter outlet chamber.

REFERENCES:
patent: 625508 (1899-05-01), Hyatt
patent: 719357 (1903-01-01), McClintock
patent: 3134735 (1964-05-01), Greenleaf, Jr.
patent: 3282432 (1966-11-01), Greenleaf, Jr.
patent: 3682307 (1972-08-01), Cook et al.
patent: 4946600 (1990-08-01), Shin
patent: 5032294 (1991-07-01), Schulz
Brochure entitled, "Greenleaf Filter Control," pub. by Infilco Degremont Inc., dated Mar. 1976.
Brochure entitled "GFC CenTROL Multicell Gravity Filters," pub. by General Filter Company, 1980.
"Design Options for Water Filtration," by Robert D. G. Monk, Journal AWWA, Sep. 1987, pp. 93-106.

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