Liquid purification or separation – Flow – fluid pressure or material level – responsive – Vent control
Patent
1980-03-04
1981-11-10
Spitzer, Robert H.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Vent control
210130, 210136, 210172, 210238, 210448, 210DIG14, B01D 2710, B01D 3502
Patent
active
042996961
ABSTRACT:
A fluid filtering device is provided which is particularly suitable for connection with the suction line of a hydraulic pump. The fluid filtering device comprises an elongated tubular cylindrical housing open at each end and which has at least its lower end submerged in a reservoir of the fluid to be filtered. An elongated filter assembly includes an extension tube and tubular cylindrical filter element detachably coaxially connected at one end to the extension tube. The filter assembly is axially insertable into the housing so that the filter element is positioned below the fluid level of the reservoir. Upon insertion, both axial ends of the filter element sealingly engage the interior walls of the housing while the filter element is spaced radially inwardly from the housing and thus forming an annular outlet chamber. Fluid flows from the bottom housing, through the filter element, to the annular chamber and out through a fluid connector open to the annular chamber. Preferably, a differential pressure responsive bypass valve is fluidly connected between the annular chamber and the reservoir wherein said bypass valve opens upon a predetermined differential pressure across the filter element.
REFERENCES:
patent: 2041043 (1936-05-01), Bennett
patent: 2078543 (1937-04-01), Salisbury
patent: 2447144 (1948-08-01), Thornton
patent: 3368680 (1968-02-01), Bozek
patent: 3486622 (1969-12-01), Rosaen et al.
patent: 3487930 (1970-01-01), Rosaen
patent: 3519131 (1970-07-01), Rosaen et al.
patent: 3628662 (1971-12-01), Kudlaty
patent: 3747761 (1973-07-01), Heinrich, Jr.
patent: 4042505 (1977-08-01), Waggoner
patent: 4167483 (1979-09-01), Rosaen et al.
Fosdick Dale P.
Rosaen Borje O.
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