Modular pure water systems are provided that have a tank and a cover assembly, wherein the tank and cover assembly are configured to removably receive therebetween one or more expansion tubes in a fluid tight manner to allow for selective volume expansion of the pure water system. Also provided are purification media bags for pure water systems that have a shape, construction, and/or material that mitigates the flow of water between the outer wall of the bag and an inner wall of the pure water systems.

A filter device may include a filter housing with a filter housing pot and a cover screwable onto the filter housing pot, and an annular filter element arranged in the filter housing. The annular filter element may be connected to the cover via a first thread, which may have a dome protruding centrally and axially from an upper end disc of the annular filter element, with an outer thread interrupted by free passages, and hollow cylindrical spring elements, which may protrude axially from the cover and on which an inner thread portion designed to complement the outer thread may be arranged. Each inner thread portion may extend over a longer circumferential portion than one of the free passages. The first thread may be designed running counter to a second thread arranged between the filter housing pot and the cover.

Flexible housing filters for filtration of fluids and methods of making such filters are disclosed. The filters may include one or more peripheral seals in the flexible housing.

An oil strainer support structure for an internal combustion engine capable of improving the maintainability of an oil strainer is provided. In an oil strainer support structure for an internal combustion engine having an oil strainer, the oil strainer is supported by a drain bolt provided in the internal combustion engine. The oil strainer can be detached by removing the drain bolt to improve maintainability.

A housing assembly, portable filter system using the housing assembly and methods of mounting a filter element in a housing assembly are provided. The housing assembly is usable with filter elements of different types. The housing assembly includes a housing body having an open end and being attached to a filter head. The filter head includes a first housing sealing interface configured to sealingly mate with a filter element of the first type and a second housing sealing interface configured to sealingly mate with a filter element of the second type. A cover member removably attaches to the housing body and includes a third housing sealing interface configured to sealingly mate the filter element of the second.

A filter unit and a filter cage, the filter unit comprising a filter chamber and a filter cage. The filter chamber comprises opposing first and second end walls, a sidewall therebetween, and an opening in the second end wall. The filter cage is rotatable in the filter unit and comprises a sidewall comprising filter media and an opening at a first end for the filter cage. The filter cage is removable via the opening in the filter chamber. The filter chamber further comprises an inlet to pass feed liquid into the filter cage via the opening and an outlet for filtered liquid. The filter unit further comprises a drive shaft to rotate the filter cage. A connection member in the filter chamber forms a rotary seal and a detachable connection to the filter cage. This arrangement permits removal and emptying of the filter cage a single operation amongst other benefits. In alternative aspects a filter cage comprises a moveable member and a user operable portion for extraction of filtered microparticles through the opening.

A water filter element for use within a water purification system includes a housing, a locking protrusion, and a handle. The housing comprises a first end comprising a water inlet and a water outlet and a second end opposite the first end. The locking protrusion is positioned on the housing proximate the second end of the housing, and the handle is disposed on the second end of the housing. The handle comprises an outer side oriented away from the first end of the housing. When the water filter element is installed within the water purification system, the outer side of the handle causes the second end of the housing to be radially displaced such that the locking protrusion is engaged by a lock of the water purification system. Water filter assemblies including the water filter element and methods of installing and removing the water filter element are also described.

A housing assembly, portable filter system using the housing assembly and methods of mounting a filter element in a housing assembly are provided. The housing assembly is usable with filter elements of different types. The housing assembly includes a housing body having an open end and being attached to a filter head. The filter head includes a first housing sealing interface configured to sealingly mate with a filter element of the first type and a second housing sealing interface configured to sealingly mate with a filter element of the second type. A cover member removably attaches to the housing body and includes a third housing sealing interface configured to sealingly mate the filter element of the second.

A filtration system comprises a housing and a shell housing removably coupled to the housing. A valve comprise a valve housing and a plunger. The plunger comprises a seal member structured to seal an opening in the valve housing. The plunger is axially movable between a closed position, in which the seal member seals the opening, and an open position, in which the seal member does not seal the opening, thereby permitting fluid to flow through the valve housing. A filter element comprises filter media and an endcap. The endcap comprises an alignment tab configured to rotationally secure the filter element with respect to the shell housing when the shell housing is received in the housing. The endcap comprise a valve interaction projection structured to transfer rotation of the filter element and the shell housing to the plunger during installation of the filter element.