Backwashing-type filtering apparatus

Details Backwashing-type filtering apparatus Backwashing-type filtering apparatus

1982-01-25

1983-12-27

Spitzer, Robert H.

Liquid purification or separation

Filter

With residue removing means or agitation of liquid

210437, 210448, 210456, 210457, 210488, B01D 2502, B01D 2712

Patent

active

044229380

ABSTRACT:
A filtering apparatus suitable for being cleaned by backwashing includes an outer housing (11) and an inner filter (13) disposed in the outer housing defining an outer annular flow passage (16) and an inner flow passage (17). The outer housing is tapered in relation to the external shape of the filter to provide a substantially uniform liquid velocity through the filter in both forward flow and backflow directions. The filter is made up of a plurality of ring-like segments (38) stacked end to end on which a filter medium (37) is mounted.

REFERENCES:
patent: 427447 (1890-05-01), Thomson
patent: 869165 (1907-10-01), Etter
patent: 872437 (1907-12-01), Leonard
patent: 2304492 (1942-12-01), Aue et al.
patent: 2569748 (1951-10-01), De Grave
patent: 2875594 (1959-03-01), Schilling
patent: 3016108 (1962-01-01), Myddelton
patent: 3169109 (1965-02-01), Hirs
patent: 3269097 (1966-08-01), German
patent: 3722189 (1973-03-01), Tourtellotte
patent: 3770129 (1973-11-01), Brumfield et al.
patent: 3929639 (1975-12-01), Turner et al.
patent: 3992886 (1976-11-01), Scott
patent: 4043918 (1977-08-01), Orona
patent: 4052315 (1977-10-01), Lindsay et al.
patent: 4090962 (1978-05-01), Braukmann
patent: 4157902 (1979-06-01), Tokar
patent: 4284500 (1981-08-01), Keck
What is a Ronningen-Petter Filter? (4 sheets), by Ronningen-Petter Division, Dover Corporation, Portage, Mich.

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