Abstract: A fluid filter assembly incorporates a filter element and valve assembly within a filter housing and base plate. The filter element and valve assembly is a single pre-assembled unit which includes an anti-drainback valve seat and diaphragm, a by-pass valve assembly, a pleated paper filter element, and a spring endcap. The filter housing and base plate separably clamp together to enclose the filter element/valve cartridge which is replaceable, as a single assembly, once its filtering ability is degraded. The anti-drainback valve seat engages complementary features on the base plate to correctly align and position the filter/valve cartridge during assembly. Further, a recess within the top of the filter housing receives a protrusion on the filter element endcap to provide additional alignment and to provide pressure to seal the filter/valve cartridge to the base plate in a fluid-tight manner.

Abstract: A reusable liquid filtering system and a disposable liquid filter used in the liquid filtering system are provided for use with an internal combustion engine or pump. The liquid filter includes first and second end members and a liquid bypass valve is connected to and projects outwardly from the first end member whereby excessive oil pressure will result in opening of the bypass valve so that an emergency oil flow bypass is thereby provided. The disposable liquid filter is removably positioned within a container of the reusable liquid filtering system. A base is removably connected to the engine or pump and to an open end of the container for allowing removal and replacement of the liquid filter and for allowing neat and spill-free drainage of oil from the container when the base and the container have been removed from the engine or pump and when the base has been removed from the container.