Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Position or extent of motion
Patent
1976-07-01
1978-04-04
Adee, John
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Position or extent of motion
210 94, 210132, 210167, 210222, 210446, 60454, B01D 2710
Patent
active
040826651
ABSTRACT:
In a fluid filter device particularly suited for installation in an automotive power steering system, a cylindrical filter element which is axially movable in a casing having inlet and outlet passages at its opposite ends includes a foraminous side wall constituting a primary filter and a valve member at one end of the filter element normally urged to engage a seat about the opening of the inlet passage by a spring acting on the filter element so that, when the primary filter becomes clogged, the buildup of the differential pressure between the inlet and outlet passages causes axial movement of the filter element for unseating the valve member and permitting the fluid to bypass the primary filter through an annular clearance between the latter and the casing wall, and a secondary filter annulus extends from the filter element across such annular clearance for filtering the fluid which bypasses the primary filter. Further, the casing wall is preferably provided with a cavity having filtered openings to the annular clearance at the down-stream side of the secondary filter annulus, and at least one bypass passage in the casing wall extending to the cavity from a port which is normally closed by the secondary filter annulus so that such port is opened to permit continued flow of filtered fluid to the annular clearance by way of the filtered openings of the cavity only when the secondary filter annulus becomes clogged to cause further axial movement of the filter element.
REFERENCES:
patent: 2793752 (1957-05-01), Jay
patent: 3334747 (1967-08-01), Niccum et al.
patent: 3467256 (1969-09-01), Humbeat et al.
patent: 3795312 (1974-03-01), Lawson
patent: 3945208 (1976-03-01), O'Connor
Novak Emil J.
Schneider Manuel
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