A liquid filter cartridge is provided. Preferred seal arrangements are provided, to provide for preferred axial load conditions, with respect to one or more of the end caps of the cartridge. Some cartridge configurations provided include no core structure or outer liner structure therein, to support axial load. Assemblies using the cartridge, and methods of assembly and use, are provided. The liquid filter cartridge can be a serviceable cartridge, or it can be retained permanently in a housing.

An adaptor plug for a spin-on fluid filter, in particular for a spin-on return filter, wherein the adaptor plug comprises a plug-in end which is designed to be plugged into a cavity in a flange of a hydraulic device in a fluid tight manner and a filter end which is designed to be connected to the spin-on filter in a fluid tight, detachable manner and at least one internal fluid channel connecting said plug-in end with said filter end, wherein the adaptor plug at its filter end comprises a threaded tube or bolt on which the spin-on filter can be screwed. By this design, the use of a filter set with or without an adaptor ring between the adaptor plug and the filter is enabled. By the adaptor plug, the spin-on filter can be applied to a variety of hydraulic devices, among others, with a ¾ 16 UNF cavity.

A filter element, for use filtering liquids such as fuel, includes a first section of filter media, an optional layer of coalescer media, and a section of barrier media. The first section and optional coalescer filter media are held between opposite first and second end caps. The second end cap is integrated with the barrier filter media. The barrier media extends at least part way into an interior of the first section and can be conical in shape.

A filtration system includes a filter housing and a filter cartridge. The filter housing includes a base and a cover removably coupled to the base. The cover includes a retainer. The filter cartridge has a longitudinal axis and is movable between an installed position within the filter housing and an uninstalled position outside the filter housing. The filter cartridge includes a top endplate including at least one protrusion extending upwardly away from the top endplate. The protrusion includes a tab extending radially outward from the protrusion that is structured to interact with the retainer to removably couple the filter cartridge to the cover. The filter cartridge further includes a bottom endplate and a filter media extending axially between the top endplate and the bottom endplate.

A filter element has a filter media assembly extending between a first end and a second end to define a media length along a longitudinal axis. The filter media assembly defines a central opening on an upstream side and an outer radial boundary on a downstream side. A first endcap is coupled to the first end. The first endcap has a media potting structure defining an annular surface abutting the first end of the filter media assembly, an inner tubular flange extending longitudinally from the annular surface into the central opening, and an outer tubular flange extending longitudinally from the annular surface over the outer radial boundary of the first end of the filter media assembly. The first endcap has an outer circumferential sealing surface about the longitudinal axis and a shroud to obstruct fluid flow extending longitudinally from the outer circumferential sealing surface towards the second end.

A filter device for the filtration of fluids, at least consisting of a filter housing (10), which can be closed by means of a cover (40), and a filter element (30) accommodated in a replaceable manner in the filter housing (10), is characterized in that at least one functional element is present on the cover (40) and on the filter housing (10) and on the filter element (30) in such a way that the filtration of the fluid is only possible when all functional elements interact simultaneously.

A protruding portion is formed on an inner tube inserted into a hollow portion of a filter medium so as to protrude upward from a flange portion. The flange portion having a substantially circular plate shape is disposed on a lower side of a second plate. A recessed portion into which the protruding portion is inserted is formed on a surface on a lower side of the second plate provided so as to cover an opening at a lower end of the filter medium.

A filter assembly includes a filter holder into which a part of the filter is insertable, and a lock mounted to the filter holder and configured to lock and release the filter to and from the filter holder. The lock includes a guide coupled to the filter holder and configured to be linearly movable to transmit a force in a direction into which the filter is inserted, a pusher configured to transmit a force in a direction opposite to the direction, into which the filter is inserted, by an elastic member, a stopper rotatably received in the pusher to be arranged between the pusher and the guide, and configured to linearly move the filter holder by being linearly moved by the guide and the pusher, and a cam configured to lock and release the filter to and from the filter holder by guiding rotation and linear movement of the stopper.

A filter device is provided with a filter element for filtering a fluid. The filter element has a filter medium body with an end plate arranged at an end face of the filter medium body in relation to a longitudinal axis of the filter medium body. A filter base housing receives the filter element. An assembly component for assembly and disassembly of the filter element in the filter base housing is connectable to the end plate and to the filter base housing by rotation about the longitudinal axis. The assembly component has interlocking elements. An interlocking counter element is arranged at the end plate. The interlocking elements can be brought into axial interlocking connection with the interlocking counter element, while enabling a free rotatability in rotational direction about the longitudinal axis. The interlocking counter element is a circumferential interlocking collar with insertion ramps for insertion of the interlocking elements.

Module carrier for receiving a module having a fluid connection for use in a system for water treatment or water monitoring, wherein the module carrier can be reversibly connected to at least one further module carrier to form a module carrier assembly, wherein the module carriers can be connected to one another mechanically and detached from one another, wherein, during the mechanical separation or connection of the module carriers, at least one hydraulic connection between the module carriers can likewise be separated or connected.