A filter system is provided with a housing provided with a cover. The housing has a raw liquid inlet, a clean liquid outlet, and a liquid drain. A filter element is provided that separates a raw side from a clean side. A slide valve with a valve rod and a sealing head is provided, wherein the sealing head is arranged such that the liquid drain of the housing is closable but openable. A coupling is arranged between the sealing head and the valve rod, providing an axial securing action of the valve rod at the sealing head and a radial securing action, separate from the axial securing action, of the valve rod at the sealing head. A slide valve for such a filter system as well as a sealing head and a valve rod for such a slide valve are provided.

A method including the steps of moving fluid through an inlet into a vessel, the vessel being at atmospheric pressure and having at least one side wall and a bottom wall forming an internal chamber within the vessel. The method further includes moving the fluid into and through a filtration unit utilizing a downstream pump, the filtration unit creating a flux of less than or equal to about 0.05 gallons per minute per square foot (GPM/ft.sup.2), and moving the fluid processed by the filtration unit to an outlet and out of the vessel.

A filter device may include a filter housing and a filter element defining a longitudinal axis disposed in the filter housing. The filter element may be configured to be penetrated by a fluid flow in a radial direction from a raw end to a pure end of the filter element. A water separator may be disposed at the pure end of the filter element and arranged axially spaced from the same. The water separator may have a hydrophobic and annular diaphragm extending in an axial direction of the filter element configured to be penetrated by the fluid flow from a raw end of the water separator in a radially outward to a radially inward direction with respect to the longitudinal axis to separate water from the fluid flow.

A filter assembly including a filter screen (27) comprising a band (27′) of porous material extending between two axially aligned opposing ends (38, 38′) and defining a cylindrical periphery (29), wherein the ends (38, 38′) are each secured to a dynamic tensioning mechanism (46) that permits the ends (38, 38′) to move bi-directionally relative to one another about the periphery (29) of the filter screen (27).

A hollow filter element of a fluid filter has a filter element-associated retention/carrier device of a retention/carrier system retaining the filter element in a first housing section of a filter housing during installation/removal in or from a second housing section by rotation and/or insertion movement. The filter element-associated retention/carrier device has a retention/carrier part extending radially and circumferentially and has through holes adjacent thereto extending circumferentially so as to enable a filter housing-associated retention/carrier part of the retention/carrier system to pass through axially. This retention/carrier part has a tensile face extending circumferentially and radially on a side facing away from an end face of the filter element facing the first housing section. This retention/carrier part has a rear side in circumferential direction. A space axially adjacent to the tensile face is connected on the rear side to a through hole for guiding through the filter housing-associated retention/carrier part.

A hollow filter element of a fluid filter has a filter element-associated retention/carrier device of a retention/carrier system retaining the filter element in a first housing section of a filter housing during installation/removal in or from a second housing section by rotation and/or insertion movement. The filter element-associated retention/carrier device has a retention/carrier part extending radially and circumferentially and has through holes adjacent thereto extending circumferentially so as to enable a filter housing-associated retention/carrier part of the retention/carrier system to pass through axially. This retention/carrier part has a tensile face extending circumferentially and radially on a side facing away from an end face of the filter element facing the first housing section. This retention/carrier part has a rear side in circumferential direction. A space axially adjacent to the tensile face is connected on the rear side to a through hole for guiding through the filter housing-associated retention/carrier part.

Defluidizing tanks may include a tank having an interior defined by side walls and a bottom; a filter assembly emplaced within the interior of the tank and constructed to receive a slurry of solids and recovered fluid; and a weir chamber within the tank and defined by the interior of the tank and at least one wall of the filter assembly. Systems may include a source of recovered fluid from a wellbore operation; a filtration unit receiving the recovered fluid and isolating a fraction of solids from the recovered fluid, the filtration unit having a backflush mode in which the fraction of solids is evacuated from the filtration unit; and a defluidizing tank receiving the evacuated fraction of solids to generate a filtrate and dried solids.

An auto-cleaning marination filter for a poultry injector system including an outer housing having a liquid inlet and outlet, a screen that allows passage of liquids and impedes passage of solid particles, and a wiper surrounded by said screen for removing solid particles attached to the screen by reverse flow of the liquid through a gap in the wiper.

An apparatus for filtering fluid has a container, a platform positioned in the interior volume of the container in a location above a bottom of the container, and a bag filter extending through a hole in the platform. The bag filter has an inlet and an outlet. The inlet is positioned at or above a top surface of the platform and an outlet positioned below the top surface of the platform such that a fluid passing through the fluid inlet of the container flows into the inlet of the bag filter and outwardly of the outlet of the bag filter so as to flow toward the fluid outlet of the container. A retainer plate is positioned over the platform and has an orifice opening to the inlet of the bag filter.

A filter element having a central axis includes a first endplate having a first central aperture, a second endplate having a second central aperture, a filter material positioned between the first endplate and the second endplate and having an axial passageway extending therebetween and along the central axis, the axial passageway axially aligned with the first central aperture and the second central aperture. The filter element includes a plurality of fingers attached to the first endplate and positioned circumferentially about the central axis and extending parallel therewith, each finger having a lip that extends from a surface of its respective finger for axial engagement with a respective nodule, of a plurality of nodules, of a filter head.