A filter element includes an unfiltered side via which a fluid is able to be introduced, and a filtered side via which fluid is able to be output, and first and second filter mediums that are situated between the unfiltered and filtered sides, where the first filter medium has a lower relative pressure loss than the second filter medium in a flow direction of the fluid from the filtered side to the unfiltered side.

A filter element includes an unfiltered side via which a fluid is able to be introduced, and a filtered side via which fluid is able to be output, and first and second filter mediums that are situated between the unfiltered and filtered sides, where the first filter medium has a lower relative pressure loss than the second filter medium in a flow direction of the fluid from the filtered side to the unfiltered side.

A multi-zoned paddle screen apparatus 100 is disclosed for separating fiber from a liquid medium during, for example, a grain wet mill or dry grind process. The apparatus includes a housing 106 having first and second zones 108a, 108b situated adjacent one another along a length (L) of the housing 106. First and second screen sections 102a, 102b having a plurality of openings 104 may be situated lengthwise within the housing 106 corresponding with the first and second zones 108a, 108b, respectively. The first and second screen sections 102a, 102b have a circular cross-section, and the second screen section 102b has a larger diameter than the first screen section 102a. An elongated shaft 130 situated lengthwise within the screen sections 102a, 102b includes first and second conveyors 128a, 128b, which correspond with the first and second zones 108a, 108b, respectively, having a plurality of paddles 132. Each conveyor 128a, 128b is configured to move material in a direction along a length of the screen 102a, 102b. There may be more than two zones 108a, 108b.

A filter assembly including a filter housing having a longitudinal axis, the filter housing divided into a first filter chamber and a second filter chamber. The filter assembly further includes a first filter element and a second filter element. The first filter element includes a first element top endplate, a first element bottom endplate, and a first filter media positioned between the first element top endplate and the first element bottom endplate. The second filter element includes a second element top endplate, a second element bottom endplate, and a second filter media positioned between the second element top endplate and the second element bottom endplate. The filter assembly further includes a solid tube positioned between the first element top endplate and the second element bottom endplate.

An oil deterioration prevention device is provided that can prevent an increase in pressure loss by reducing oilflow resistance. The oil deterioration prevention device may include a filtering unit including a filter element that filters oil, and a deterioration prevention unit including a powdery deterioration prevention agent that prevents deterioration of oil, wherein the deterioration prevention unit includes a passage wall that retains the deterioration prevention agent and forms an oil passage.

An oil deterioration prevention device is provided that can prevent an increase in pressure loss by reducing oilflow resistance. The oil deterioration prevention device may include a filtering unit including a filter element that filters oil, and a deterioration prevention unit including a powdery deterioration prevention agent that prevents deterioration of oil, wherein the deterioration prevention unit includes a passage wall that retains the deterioration prevention agent and forms an oil passage.

A filter for a liquid purifier may include a filter housing having an inlet and an outlet; and a filter module provided in the filter housing, and configured to purify liquid introduced through the inlet, and to supply the purified liquid to the outlet. The filter module may include an electrostatic adsorption nonwoven fabric having a hollow portion. The filter module may be configured to receive the liquid introduced through the inlet is to pass through the electrostatic adsorption nonwoven fabric and then is to discharge out of the outlet of the filter housing.

A filter element has a filter structure and first and second end caps attached to the opposite ends of the filter structure. The filter structure includes an outer filter pack, an inner filter pack, and a helical support positioned between the outer and inner filter packs. The helical support may have flow channels and support ridges on the inner surface and the outer surface of the helical support. Unfiltered fluid may be directed outside-in through the outer filter pack and inside-out through the inner filter pack, the support ridges of the helical support supporting the outer and inner filter packs against the pinching forces associated with the pressure drops across the outer and inner filter packs. Filtrate may be directed axially along the flow channels of the helical support and discharged from the filter element.

A filter element has a filter structure and first and second end caps attached to the opposite ends of the filter structure. The filter structure includes an outer filter pack, an inner filter pack, and a helical support positioned between the outer and inner filter packs. The helical support may have flow channels and support ridges on the inner surface and the outer surface of the helical support. Unfiltered fluid may be directed outside-in through the outer filter pack and inside-out through the inner filter pack, the support ridges of the helical support supporting the outer and inner filter packs against the pinching forces associated with the pressure drops across the outer and inner filter packs. Filtrate may be directed axially along the flow channels of the helical support and discharged from the filter element.

A filter arrangement includes a cleaning mechanism for cleaning at least one screen filter of the filter arrangement. The cleaning mechanism has a flush chamber, a central hollow core that extends through the flush chamber, and suction nozzles fitted to the core. The core extends between opposing axial ends that are located outside of the flush chamber in exposure to substantially similar pressures at least during a cleaning operation of the cleaning mechanism.