Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1981-03-10
1982-03-30
Therkorn, Ernest G.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210136, 210232, 210444, B01D 2710, B01D 3514
Patent
active
043222900
ABSTRACT:
A filter assembly with an inner housing and filter element mounted within an outer housing, and with first and second poppets carried on a shaft in said inner housing forming first and second valves. The filter assembly has a normal flow path from the outer housing inlet through the filter element and into the inner housing past the first poppet valve and then out the outlets from the inner housing to the outer housing. A bypass flow path is provided through the filter assembly when the filter element is blocked or dirty. In the bypass operation, the increased pressure differential between inlet and outlet causes operation of the second poppet valve providing a flow path from inlet to outlet bypassing the filter element. A reverse flow path is also provided by the second poppet valve to prevent flushing of the filter during reverse flow conditions such as occur when the filter assembly is utilized in conjunction with a hydraulic motor.
REFERENCES:
patent: 2431782 (1947-12-01), Walton
patent: 2995249 (1961-08-01), Boewe
patent: 3080972 (1963-03-01), Smith
patent: 3238085 (1966-02-01), Humbert
patent: 3400821 (1968-09-01), Singleton
patent: 3485371 (1969-12-01), Costantini
patent: 3715032 (1973-02-01), Nicko
patent: 3777889 (1973-12-01), Henderson
patent: 3912046 (1975-10-01), Ferguson
patent: 3996137 (1976-12-01), Cooper
patent: 4051031 (1977-09-01), Suzuki
Paul-Munroe Hydraulics Inc.
Therkorn Ernest G.
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