Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1989-05-31
1991-05-07
Fisher, Richard V.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210791, 210108, 210120, 210138, 210313, 21033301, 210411, 2104161, 210436, B01D 2962
Patent
active
050134574
ABSTRACT:
A liquid filtering and backwashing apparatus is disclosed comprising a pressurized filter tank having a first outlet valve and a filter cell disposed within the filter tank. The filter cell includes a conduit and an outer member with the outer member spaced apart relative to the conduit with a filtering medium positioned between the conduit and the outer member. A plurality of openings in the outer member enable fluid communication between the liquid to be filtered in the filter tank and the filtering medium. The conduit is provided with a plurality of slits to enable the pressure in the tank to force fluid communication between the filtering medium and interior of the conduit while retaining the filtering medium external the conduit. Means are provided to vary the size of the slits to adjust for differing pressures or filtering requirements. A backwash holding tank in fluid communication with the conduit collects the filtered liquid. The backwash holding tank includes a second outlet valve for the filtered liquid to drain. When the filter cell becomes clogged with the filter clogging material the first outlet valve is opened, the second outlet valve is closed, and the backwash holding tank is provided with compressed gas through an inlet valve forcing filtered liquid back into the filter cell and filter tank thereby backwashing the filter cell and filter tank.
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patent: 4818420 (1989-04-01), Mims
Fisher Richard V.
Uddo-Mims International
Upton Christopher
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