Backwash flushing filter

Details Backwash flushing filter Backwash flushing filter

2006-02-21

2006-02-21

Walker, W. L. (Department: 1723)

Liquid purification or separation

Filter

With flow controller for material being treated

C210S429000, C210S232000

Reexamination Certificate

active

07000782

ABSTRACT:
An inline backwash, flushing filter assembly comprising a header assembly, a rotatable valve assembly, and a filter element assembly disposed within a filter housing assembly. In operation, the controller moves the turn knob of the rotatable valve assembly a one-quarter turn which results in the reversal of fluid flow through the assembly to periodically back flush the filter utilizing fluid from the system inlet. Debris removed from the filter element during the backwash process are immediately discharged from the system through a drain port. Simultaneously, the hydraulic shearing mechanism of the backwash process dislodges and drains debris which may have accumulated on the screen and at the bottom of the lower filter assembly during normal filter operations. The controller then returns the filter assembly to filtration operation by a reverse one-quarter turn of the turn knob of the rotatable valve assembly.

REFERENCES:
patent: 3513981 (1970-05-01), Mendelow
patent: 3834537 (1974-09-01), Brett
patent: 4515692 (1985-05-01), Chandler et al.
patent: 4652369 (1987-03-01), DePolo et al.
patent: 5057214 (1991-10-01), Morris
patent: 5118418 (1992-06-01), Roussel

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