Multibed filter backwashed by movable isolation hood

Details Multibed filter backwashed by movable isolation hood Multibed filter backwashed by movable isolation hood

B - Operations, Transporting

01

D

182/98

B01D 24/00 (2006.01)

Patent

CA 1090712

ABSTRACT The rotating backwash isolation hood of a multibed filter is raised and lowered by either hydraulic forces and gravity, or by an improved mechanism employing a pair of pistons and cylinders and a perforated indexing disc, or by both of these arrangements. The force required to lift the hood is reduced by eliminating the effect of the static head of the liquid above the hood. Leakage between the hood and the filter it covers is detected by a pressure differen- tial indicating switch. A floculator may be combined with the multibed filter, and the dirty backwash liquid from the hood may be recirculated into the floculator.

281165

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