Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1989-04-19
1991-05-28
Dawson, Robert A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210136, 210446, B01D 2710
Patent
active
050192515
ABSTRACT:
The invention relates to a filter apparatus for filtering oil in particular. The object is to provide a filter apparatus reliable in operation and simple in construction. A spring-loaded (22) valve plate (18) is provided at one end (5) of a casing surrounding a tubular filter cartridge (2). The valve plate comprises, at a distance from its outer edge, an annular cutting edge (19) sealing against the end (5) of the casing. Oil flows radially inwards through the filter cartridge (2). When the filter (2) is gradually blocked by impurities, the pressure of the oil rises outside the filter cartridge. This pressure acts on an annular surface (31) between the outer edge and the sealing cutting edge (19) of the valve plate. When the pressure rises sufficiently, the valve plate is displaced away from the end (5) of the casing, whereby oil may flow through the connection so obtained past the filter (2) directly into its central cavity (11).
REFERENCES:
patent: 3557957 (1971-01-01), Baldwin
patent: 3853763 (1974-12-01), Hall
patent: 3912630 (1975-10-01), Reighard et al.
patent: 4207187 (1980-06-01), Booth
patent: 4212739 (1980-07-01), Hilton et al.
patent: 4575422 (1986-03-01), Zimmer
patent: 4629558 (1986-12-01), Garritty
patent: 4705626 (1987-11-01), Morelli
Dawson Robert A.
Millard Wanda L.
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