Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Reexamination Certificate
1999-02-04
2001-09-04
Walker, W. L. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
C210S430000, C210S440000, C137S543170
Reexamination Certificate
active
06284130
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to a clean side anti-drainback valve and to a kit employing a clean side anti-drainback valve. More particularly, the present invention is directed to such a valve and kit for use with internal combustion engines.
BACKGROUND OF THE INVENTION
Typically, internal combustion engines utilize filters having a filter media which removes harmful particles from lubricating oil. When the filter media becomes clogged, it is desirable to change the filter, but, for one reason or another, many filters are not changed upon becoming clogged. The engine will still need to be lubricated so filters are typically provided with bypass valves. When the engine is not running, the oil is not under pressure and will therefore tend to drain back into the engine so that when the engine is again started, oil is not initially pulled from the filter element because the filter element is empty. During the time it takes to circulate oil through the filter element, there is a risk of the engine not being lubricated for a very short interval. During that short interval, the engine may suffer slight wear. A minimal number of short intervals is not significant, but as the engine is started repeatedly, the amount of time that sufficient lubricating oil is unavailable because the filter has been drained, can become rather lengthy and thus result in engine damage. In order to prevent this, dirty side anti-drainback valves are employed.
However, even when dirty side anti-drainback valves are employed, there is an opportunity for wear because clean side oil in the hollow core of the filter element has been allowed to drain away and thus there is an interval when insufficient lubricating oil is available during engine starts. Consequently, it is advisable with some engines to provide a clean side anti-drainback valve, as well as a dirty side anti-drainback valve, so that the oil filter does not contribute to engine wear due to voids in oil circulation because clean side oil has drained from the hollow core of the filter element, even though dirty side oil has been retained.
In the manufacture and supply of oil filters, most situations require only oil filters which have a dirty side anti-drainback feature and a bypass feature. Typically, this requires a filter cartridge of a first configuration. There is, however, a demand for filter elements which have both clean side and dirty side anti-drainback capabilities, and thus the manufacturer must stock a separate line of lubricating filters for this purpose. Usually, it is more inconvenient and therefore more expensive to provide two different products, if the parts for those products are not readily interchangeable, because work in process inventory is increased.
SUMMARY OF THE INVENTION
It is a feature of the present invention to provide a new and improved arrangement to facilitate incorporating clean side anti drain back valves in oil filter cartridges which already have dirty side anti-drainback valves and bypass valves disposed therein.
In view of this feature and other features, the present invention is directed to an anti-drainback valve for use with a filter cartridge having an annular filter element supported on an annular valve support defining a passage leading out of the filter cartridge wherein, the anti-drainback valve comprises an annular valve seat having a central opening and a peripheral flange. The annular valve seat is adapted to be mounted on the annular valve support with the central opening in alignment with the passage leading out of the filter cartridge. A valve is mounted on the valve seat for movement between a first position where it closes the passage through the valve seat and a second position in which it opens the passage through the valve seat. A biasing device is disposed between the valve and valve seat for urging the valve to the first position.
In a further aspect the valve seat has a dish portion between the central opening and peripheral flange, which dish portion is adapted to seat within the passage leading out of the filter cartridge with the peripheral flange engaging the annular valve support and extending radially outside of the passage.
In still another aspect the valve comprises a first portion which covers the opening through the valve seat and a second portion which projects axially from the first portion, the second portion including a spring seat which faces the valve seat, wherein the biasing device is a spring disposed between the valve seat and spring seat for urging the valve toward the first portion so that it engages the valve seat to close the opening.
In an additional aspect the valve seat is held on the valve support with the valve seat within the passage leading out of the filter cartridge by positive engagement between an outside surface of the dish portion and an inside surface of the valve support.
The present invention is also directed to a kit comprising a filter cartridge including an annular filter element defining a hollow core disposed in a housing closed by a base plate having a central outlet opening aligned with the hollow core of the filter element. An annular valve support is disposed in axial alignment with a central outlet through the base plate, the annular valve support including a cylindrical outlet passage there through as well as bypass openings. A valve member is mounted on the valve support, the valve member having a dirty-side anti-drainback portion normally closing the inlet openings and a bypass portion normally closing the bypass openings in the valve support. In combination with the filter cartridge is a clean side anti-drainback valve having a valve seat with a central opening. The clean side anti-drain back valve is adapted to be mounted on the valve support with the central opening in alignment with the cylindrical outlet passage of the valve support and with a valve mounted on the valve seat and normally baised to close the central opening in the absence of positive pressure on clean side oil in the hollow core of the filter element.
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Cecil Terry K.
Dana Corporation
Millen White Zelano & Branigan P.C.
Walker W. L.
LandOfFree
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