Filter unit for use in liquid purification apparatus

Details Filter unit for use in liquid purification apparatus Filter unit for use in liquid purification apparatus

1979-08-13

1981-06-02

Granger, Theodore A.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210304, 210411, 2105121, B01D 2326

Patent

active

042710197

ABSTRACT:
A filter unit comprises an outer casing defining a vertical-axis first chamber having a liquid inlet and a normally-closed discharge valve at its lower end and a second chamber defined by upper and lower end walls, a perforated cylindrical wall located within the first chamber and covered by a filter element and a non-perforated cylindrical wall having a lower portion coaxial with, and within the perforated wall and an upper portion projecting above the first chamber and having an outlet for liquid filtered through the filter element. A piston is slidable within the non-perforated wall to force liquid through the filter element to cleanse the latter when it becomes clogged, the piston being connected to open the discharge valve to discharge the particle-containing liquid from the first chamber. A non-return valve in a duct connected to the outlet allows air into the space above the piston to facilitate its descent.

REFERENCES:
patent: 3067876 (1962-12-01), Hruhy, Jr.
patent: 3443696 (1969-05-01), Schutte
patent: 3834535 (1974-09-01), Portyrata
patent: 3853762 (1974-12-01), Moatti
patent: 4046692 (1977-09-01), Brautmann
patent: 4162549 (1979-07-01), Charles et al.

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