An upper endcap of a fuel filter cartridge includes a skirt, an axially extending pin surrounded by the skirt, and a plurality of ribs that define fluid flow channels leading to the pin. The pin is extendable through an axially facing fuel inlet opening at the upper end of a standpipe for actuating a valve to an open position allowing fuel to flow through the axially facing inlet opening and into the standpipe. The valve can include a hole that receives the pin therein to help stabilize the valve when the valve is actuated open.

A filtering system (9) includes a filter head (12) and a replaceable filter (10). The filter head (12) has a feed line (66) and discharge line (62). The replaceable filter (10) is removable and replaceably mounted onto the filter head (12) by a rotational and/or plug connection (15) and includes a housing (17) with at least one inlet (26) for oil to be filtered and at least one outlet (28). The inlet (26) communicates with the feed line (66). The outlet (28) communicates with the discharge line (62). The housing (17) has a filtering element (34) that sealingly separates the inlet (26) from the outlet (28). The filter head (12) includes an auxiliary oil line (60). The replaceable filter (10) has a flow control element (53) that automatically closes or releases the auxiliary oil line (60) dependent on an operation and/or assembly condition.

A filter medium contamination detection structure may comprise a filter element and a prompt assembly. The prompt assembly may comprise a first pressure sensor, which may comprise a signal output end, and a second pressure sensor, which may comprise a signal output end. The first pressure sensor may be connected to a water inlet of the filter element, and the second pressure sensor may be connected to a water outlet of the filter element or outside air. The signal output ends of the first pressure sensor and the second pressure sensor may be connected to a signal input end of a controller. When the filter element is dirty, a pressure at the water inlet end may increase or a pressure at the water outlet end may decrease, and the difference between the first sensor and the second pressure sensor may increase.

A filter device includes in a filter housing a hollow cylindrical filter element having frontal end plates, a flow opening being made in one of the end plates. In order to interlockingly secure a pipe connection piece that communicates with the flow opening, a cover has a radial collar which forms an axial stop for the pipe connection piece.

A filter device includes in a filter housing a hollow cylindrical filter element having frontal end plates. A port having a first sealing element is incorporated into a cover the filter housing, said sealing element being arranged coaxially relative to a second sealing element in a flow opening in the end plate.

A filter cartridge includes a radio frequency identification, RFID, tag positioned on a casing. A compressed cellulose foam is positioned over the RFID tag on the casing. An impermeable material is positioned over the cellulose foam on the casing at an outer surface of the casing. The impermeable material defines a passage that extends through the impermeable material to the cellulose team. The passage is configured such that water is flowable through the passage to the cellulose foam. The compressed cellulose foam is configured for wicking the water from the passage to the RFID tag.

A filter cartridge includes a radio frequency identification, RFID, tag positioned on a casing. A compressed cellulose foam is positioned over the RFID tag on the casing. An impermeable material is positioned over the cellulose foam on the casing at an outer surface of the casing. The impermeable material defines a passage that extends through the impermeable material to the cellulose team. The passage is configured such that water is flowable through the passage to the cellulose foam. The compressed cellulose foam is configured for wicking the water from the passage to the RFID tag.

Fluid filters and modular relief valve assemblies for use therein are provided where the modular relief valve assembly comprises a bypass housing, a bypass spring, a valve plug, and a locator spring. The locator spring is at least partially seated within and modularly joined to a trailing portion of the bypass housing. The bypass spring and the valve plug are modularly joined to the bypass housing. The trailing portion of the bypass housing comprises at least one annular forward-facing seating surface. The leading portion of the bypass housing comprises a sealing extension, an intermediate reducing taper, and a valve plug sealing surface. The sealing extension is positioned between the forward-facing seating surface and the intermediate reducing taper. The intermediate reducing taper is positioned between the sealing extension and the valve plug sealing surface and reduces towards the valve plug sealing surface.

An oil filter assembly includes an oil filter that may be fluidly coupled to an internal combustion engine thereby facilitating the oil filter to filter oil within the internal combustion engine. A cap is removably coupled to the oil filter. The cap inhibits the oil from spilling from the oil filter when the oil filter is removed from the internal combustion engine. A drain is removably coupled to the oil filter. The drain facilitates the oil to be drained from the oil filter after the oil filter is removed from the internal combustion engine.

A filter cartridge includes a filter medium disposed within an interior volume of a casing. A leak director is positioned on the casing above an RFID tag. The leak director has a trough that extends about a sidewall of the casing. The trough of the leak director has an outlet positioned for directing liquid in the trough to the RFID tag.