A filter cartridge 38 includes a first endcap 41 defining a first open aperture and having at least first and second protrusions extending from a wall along the aperture and into the first open aperture. The first protrusion is spaced from the second protrusion in both a vertical direction and a circumferential direction. The filter cartridge also includes filter media 44 and a second endcap 42 . The filter cartridge is mountable in a filter bowl 36 having an inner liner assembly, and the bowl and the inner liner assembly is connectable to a filter head to form a filter system. The filter system can have any one or combination of the following features: a filter lock-out mechanism to ensure that the filter head and the filter bowl are not connectable unless there is a proper filter cartridge installed therein; an automatic drain mechanism to drain the filter bowl of liquid before the filter cartridge is removed from the bowl; and a cartridge retention mechanism, to ensure that the filter cartridge remains with the filter bowl after the filter bowl has been removed from the filter head. Adaptor rings can be utilized in order to test other types of filter elements in the system, when those other types of filter elements do not have the protrusion arrangement. Assemblies, methods of servicing, methods of installing, methods of use, and methods of retaining can be practiced.

A water purifying apparatus including a head having a water inlet portion and a water outlet portion; a shaft provided in the head and rotatably mounted between the water inlet portion and the water outlet portion; a bypass flow path passing through a circumference of the shaft, and communicating the water inlet portion with the water outlet portion according to rotation of the shaft; a filter detachably mounted to the head, and having a filter inserting portion in which the shaft is inserted when being mounted on the head; and a filtering flow path in which an inlet port and an outlet port are formed on the circumference of the shaft in a direction intersecting the bypass flow path, and communicated between the filter, the water inlet portion and the water outlet portion with each other according to the rotation of the shaft.

A quick change oil filter includes a filter canister and filter base that may be installed and removed manually from an engine adapter on an internal combustion engine. The filter canister and filter base may hold at least about one third of the required engine oil supply when removed from the engine adapter. The engine adapter includes an oil inlet passage, an oil outlet passage, and a filter base mounting cavity. A check valve is biased to close an oil outlet opening from the filter canister, trapping oil inside the filter canister when it is removed from the engine adapter.

A power unit including an internal combustion engine has an electric power generator mounted on an end of a crankshaft, a power transmitting member mounted on the other end of the crankshaft, and a lubricant oil filter. The oil filter partly overlaps the electric power generator as viewed in the direction of a crankshaft axis, and is positioned between the electric power generator and a crank weight on the crankshaft with respect to the direction of the crankshaft axis. The oil filter has a filter mount axis forming an acute angle to the crankshaft axis. The engine crankcase is thus prevented from bulging outwardly, and the power unit is reduced in size in its entirety.

A water purifier, including a connector assembly including a connector body and a flange portion; the connector body includes the first water inlet cavity and the first water outlet cavity; the flange portion is provided with a flange hole; a filter element assembly including an end cover, the outer wall of the end cover is provided with a flange structure accommodated in the flange hole; a filter element cover having a T-shaped water inlet channel communicated with the first water inlet cavity and a water outlet channel communicated with the first water outlet cavity; a filter element having a water purification cavity communicated with the water outlet channel; and a casing fixed on the end cover, a fourth water inlet cavity is provided between the casing and the filter element and communicated with the T-shaped water inlet channel.

Described are filter cartridges comprising: a cartridge body and a filter media; a stem extending from the cartridge body, the stem having an inlet opening, an outlet opening, and a stem face that comprises a first valve driving surface and a second valve driving surface; and at least one lug attached to either the filter body or the stem having a leading engagement edge. The filter cartridges are suitable for translational insertion and rotational engagement of a manifold, wherein upon translation insertion, a valve engagement member of the filter cartridge engages a portion of a valve body of a manifold valve; during a first stage rotation, one or more retaining members of the filter cartridge engage a manifold cam of a manifold; and during a second stage rotation, the valve engagement member imparts rotational movement to the valve body. Systems and methods incorporating the filter cartridges are disclosed.

A system is provided for a cup used to supply a liquid to a spray tool. The system may include a cup, a filter configured to mount inside of the cup, one or more supports extending across the filter, and a retainer configured to retain the filter.

An adapter for use in a filter device is provided, the adapter having a downwardly slanted inner wall including two or more hollow passageways, and a central fluid flow port, wherein the adapter can be welded to a filter device housing head.

A filter housing assembly for fluid filtration which may be attached to, and removed from, a filter base by a push-actuated release. The filter housing assembly has a top portion with an ingress port and egress port extending therefrom, and a protrusion extending from the filter housing longitudinally axial center. The ingress and egress port are formed in an hourglass shape. A filter key having a base with a groove for mating with said projection, at least one finger extending from said base, and an electronic circuit component housing attached thereto for receiving a printed circuit board, is connected to the filter housing top portion by mating said top portion protrusion with the filter key groove. Both of said ingress and egress port have at least one cavity for the passage of fluid therethrough, where each cavity is exposed in a direction facing away from the printed circuit board.

An outflow portion that causes a space inside a filter element to communicate with a space outside a filter case includes an upper surface and a bottom surface that are provided so as to be separated from each other. The back pressure valve includes the valve body having the substantially plate-like shape and the elastic member provided between the bottom surface and the valve body. The valve body is movable between a closed position in which the valve body is in contact with the upper surface, and an open position in which the valve body is not in contact with the upper surface. A recessed portion is provided in a surface, of the valve body, that comes into contact with the upper surface, and an outflow port is formed in a side surface or the upper surface of the outflow portion.