| 摘要 |
Filter cartridges having annular filter elements retained within housin gs include a cylindrical valve support on which an annular valve is mounted. The annular valve has a valve skirt and a valve sleeve. During normal operation, the valve skirt deflects, allowing lubricating oil to flow to and through the filter element. When the filter element clogs, the valve sleeve deflects, uncovering openings through the valve support which the valve sleeve normally blocks. Lubricating oil then flows through the opening s in the valve support bypassing the clogged filter. In accordance with one embodiment of the filter cartridge, the filter element, valve and valve support are held in axial abutment within the filter housing by a coil sprin g. In accordance with preferred embodiment of the filter cartridge, the filt er element valve and valve support are retained in the filter housing by adhesive.
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