Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1982-07-19
1985-03-05
Wyse, Thomas
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
210304, 210311, 210444, B01D 2708
Patent
active
045029547
ABSTRACT:
A combination fuel filter and water separator which is particularly useful at the upstream, suction side of a fuel pump includes efficient provision for initial settling of water and particulate material in a lower chamber, after which the fluid passes up through a backflow preventing check valve and into an upper chamber, where fine filtration takes place. The check valve, preferably a ball valve between the lower and upper chambers, prevents any backflow of fuel by gravity from the filter/separator assembly when a top cover is opened, e.g. for servicing of a filter element in the upper chamber. The location of the ball valve avoids subjecting it to highly contaminated entering fuel, which could foul the valve. Associated with the inlet structure of the assembly is a channel for inducing a helical flow path for centrifugally removing water and particles while imparting a downward component of motion to them.
REFERENCES:
patent: 1468906 (1923-09-01), Inman
patent: 1780774 (1930-11-01), White
patent: 1822006 (1931-09-01), Bull
patent: 2156329 (1939-05-01), Beck
patent: 3272336 (1966-09-01), Humbert, Jr.
patent: 3428180 (1969-02-01), Rogers
patent: 3698555 (1972-10-01), Conner
patent: 3931011 (1976-06-01), Richards et al.
patent: 4017397 (1977-04-01), Copeland
patent: 4298465 (1981-11-01), Druffel
patent: 4299696 (1981-11-01), Rosaen et al.
patent: 4322290 (1982-03-01), Carl
patent: 4388187 (1983-06-01), Eaglestone
Article entitled "Fool Proof Fuel Filters", John G. Hussey, Boating Illustrated, Feb. 1979, p. 24.
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