Distribution filter nozzles and filters incorporating same

Details Distribution filter nozzles and filters incorporating same Distribution filter nozzles and filters incorporating same

1982-06-15

1986-08-26

Sadowski, David

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

With rehabilitation means

210279, 210289, 210290, 210291, B01D 2320

Patent

active

046081682

ABSTRACT:
A filter employing a discrete particle filter medium (3,11), such as graded sand or the like, in which the outlet passage (6) located at the bottom (1, 29,8) of a bed of filter medium is provided in which air can be employed in the backwashing process to agitate the filter medium. The filter has shallow coarser layers (9,10,28) of particulate material beneath the filter medium (11) itself and one set of outlet nozzles (14,19,27) having appropriately dimensional perforations positioned in the coarser or coarsest particle layer (9,28). In addition further finer perforated surfaces (16,23,30) communicate with the bottom of the filter medium (11) itself and the arrangement is such that when air is introduced perparatory to, or during backwashing the air emerges predominantly from the elevated finer perforated surfaces (16,23,30).

REFERENCES:
patent: 739621 (1903-09-01), Selg et al.
patent: 2723761 (1955-11-01), Van Der Made et al.
patent: 3826375 (1974-07-01), Fournier
patent: 3869381 (1975-03-01), Graveland et al.

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