Oil filter unit with drain valve device

Details Oil filter unit with drain valve device Oil filter unit with drain valve device

2005-11-01

2005-11-01

Lithgow, Thomas M. (Department: 1724)

Liquid purification or separation

With repair or assembling means

Removable treatment part with normally disabled flow controller

C210S248000, C210S443000

Reexamination Certificate

active

06960296

ABSTRACT:
An oil filter unit has a drain valve device. The valve comprises a retainer axially movably received in a cylindrical bore of a drain passage at a position upstream of a valve seat. The retainer has a valve member holding end. A valve member is axially movably received in the retainer in such a manner as to be movable between a closed position where the valve member closes a drain bore of the valve seat and an open position where the valve member opens the drain bore. A coil spring is arranged to bias the retainer relative to the valve seat in such a direction as to cause the valve member to take the open position. The retainer has a projected portion that projects into the interior of a filter housing. When a filter element is properly set in the filter housing, the projected portion is pressed down to shift the retainer to a position to allow the valve member to take the closed position.

REFERENCES:
patent: 4906365 (1990-03-01), Baumann et al.
patent: 5098559 (1992-03-01), Mack et al.
patent: 5468386 (1995-11-01), Ardes
patent: 19711457 (1998-10-01), None
patent: 2162079 (1986-01-01), None
patent: 2-2805 (1990-01-01), None

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