A tank for storing oil includes a suction strainer with first and second filtration portions. The first filtration portion has a substantially cylindrical shape and formed by bending a thin plate into a pleated shape. The second filtration portion is provided on the outer side of the first filtration portion. The second filtration portion has a substantially cylindrical shape and is formed of a material having a plurality of spaces formed in a surface and interior of the material.

A tank for storing oil includes a suction strainer with first and second filtration portions. The first filtration portion has a substantially cylindrical shape and formed by bending a thin plate into a pleated shape. The second filtration portion is provided on the outer side of the first filtration portion. The second filtration portion has a substantially cylindrical shape and is formed of a material having a plurality of spaces formed in a surface and interior of the material.

Support and drainage materials, filter including the materials, and methods of use are disclosed.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

A fluid filter apparatus comprising an upper housing shell; a lower housing shell; a pleat pack element comprising a peripheral frame and a folded pleated media. The frame is at least partially molded over the media to secure the media in the frame, and the media comprises two or more types of media of different densities from each other. A flow control element is disposed for changing the proportion of flow between the first media and the second media responsive to changes in at least one of temperature, pressure, flow rate and/or viscosity of the fluid.

A fluid filter apparatus comprising an upper housing shell; a lower housing shell; a pleat pack element comprising a peripheral frame and a folded pleated media. The frame is at least partially molded over the media to secure the media in the frame, and the media comprises two or more types of media of different densities from each other. A flow control element is disposed for changing the proportion of flow between the first media and the second media responsive to changes in at least one of temperature, pressure, flow rate and/or viscosity of the fluid.

A centrifuge system including a centrifuge housing having a cavity at least partially surrounded by an outer shell, a central shaft extending into at least a portion of the cavity, a rotary motion source for rotating the centrifuge housing, and a filter concentrically positioned about the central shaft. The filter includes a first layer adjacent to a second layer, wherein the first and second layers are wound into a roll about a central longitudinal opening. The first layer may include at least one contaminant retention layer and the second layer may include at least one flow defining layer.

When air inside a filter device is purged, filtered liquid can be discharged together with air to the outside of the filter device. A casing is provided inside a tank, a filter element is provided inside the casing, and a lid is provided so as to cover the upper face of the casing and the upper face of the tank. A first through-hole is formed in the substantially center of an upper plate that covers the upper end face of a filtration member of a filter element and is abutted with the lower face of the lid; in a plan view, a second through-hole, in which a first opening being one end is disposed at a position overlapped with the first through-hole, and a second opening being the other end is disposed between the side face of the tank and the side face of the casing, is formed in the lid; and the first through-hole and the second through-hole communicate with the hollow portion of the filtration member and space that is inside the tank and outside the casing.

When air inside a filter device is purged, filtered liquid can be discharged together with air to the outside of the filter device. A casing is provided inside a tank, a filter element is provided inside the casing, and a lid is provided so as to cover the upper face of the casing and the upper face of the tank. A first through-hole is formed in the substantially center of an upper plate that covers the upper end face of a filtration member of a filter element and is abutted with the lower face of the lid; in a plan view, a second through-hole, in which a first opening being one end is disposed at a position overlapped with the first through-hole, and a second opening being the other end is disposed between the side face of the tank and the side face of the casing, is formed in the lid; and the first through-hole and the second through-hole communicate with the hollow portion of the filtration member and space that is inside the tank and outside the casing.