This disclosure relates to filtration screens for use in a backwashable granular media bed filtration system. Drop-in retrofit kits for a backwashable granular media bed filtration system comprising one or more filtrations screens are provided herein. Such screens and kits can comprise a media support screen, a backwash filter screen, or a combination thereof. The kit can further comprise an agitator element comprising an impeller having vanes in which the impeller vane surfaces are coated with an abrasion resistant material. Associated filtration systems and processes are also described herein.

Screen intake assemblies and related methods of fabrication and operation that improve both operational performance and structural strength. The screen intake assembly can include one or more screen portions that run substantially and continually along the length of the screen assembly to provide increase fluid intake and uniform flow. The screen intake assembly can comprise a central manifold having an exterior manifold screen portion to provide additional filtering capacity. The screen intake assembly can be used alone or in combination with internal flow modifier structures to increase fluid intake and uniformity. Internal flow modifiers can include a perforated flow modifier pipe, an internal flow modifier pipe, and/or converging flow modifiers. The screen intake assembly can include cleaning systems that operate continuously or on demand.

In one aspect, a modular filter assembly for filtering fluid that flows in a flow direction therethrough is disclosed. The assembly includes a first housing section having a first filter element; a second housing section having a second filter element; and a connector disposed between the first and second housing sections. A housing includes the first housing section, the connector, and the second housing section. The flow direction is through the first and second filter elements in series.

The present invention relates to a self-alarm multi-stage complex screen filter for micro-irrigation and the assembly method thereof. The filter comprises a housing, an alarm, a multi-stage screen filtering element, and a segmented brush. The housing comprises a left housing, a middle housing, and a right housing. The multi-stage screen filtering element comprises a plurality of screen filter cylinders. The segmented brush comprises a plurality of bristle frames, a plurality of connecting rods, a connector and a power device. The middle housing is provided with a water inlet. The left housing is provided with a discharge pipe. The installation, disassembly, repair, maintenance of the filter of the present invention can be done more conveniently.

The present invention relates to a self-alarm multi-stage complex screen filter for micro-irrigation and the assembly method thereof. The filter comprises a housing, an alarm, a multi-stage screen filtering element, and a segmented brush. The housing comprises a left housing, a middle housing, and a right housing. The multi-stage screen filtering element comprises a plurality of screen filter cylinders. The segmented brush comprises a plurality of bristle frames, a plurality of connecting rods, a connector and a power device. The middle housing is provided with a water inlet. The left housing is provided with a discharge pipe. The installation, disassembly, repair, maintenance of the filter of the present invention can be done more conveniently.

A filter cartridge device is disclosed, which includes a water stopping assembly (13) and automatic water locking assemblies (22); wherein the water stopping assembly (13) can control water supply or water cut-off of the filter cartridge device, and prevent residual water inside a filter cavity (111) from flowing out during the process of detaching the filter cartridge device; the automatic water locking assemblies (22) can control water supply or water cut-off between the filter cartridge device and an external pipe, and prevent water inside the external pipe from flowing out during the process of detaching the filter cartridge device; and the water stopping assembly (13) controls water supply or water cut-off of on its side. In addition, a water purifier comprising the filter cartridge device is also disclosed.

A center tube for use with a filter element comprises a unitary body having a standpipe that defines a length along the longitudinal axis and a central flow passage and a plurality of radially extending flow fins attached to the standpipe, the flow fins spaced axially from one another along the standpipe to define radial flow channels, wherein each of the fins further defines a first aperture between the fin and the standpipe, the apertures together defining a first outer axial flow passage and the standpipe defines a a rectangular shape.

A center tube for use with a filter element comprises a unitary body having a standpipe that defines a length along the longitudinal axis and a central flow passage and a plurality of radially extending flow fins attached to the standpipe, the flow fins spaced axially from one another along the standpipe to define radial flow channels, wherein each of the fins further defines a first aperture between the fin and the standpipe, the apertures together defining a first outer axial flow passage and the standpipe defines a a rectangular shape.

The present invention relates to a demount-free electrical cleanable filter, which includes a housing and a main filter cylinder in the housing. the housing is provided with a cleaning hoop and a reciprocating driving device. The cleaning hoop is sleeved on cylinder filtering material of the main filter cylinder. The reciprocating driving device drives the cleaning hoop to move up and down repeatedly, so as to conduct a clean-up operation on the main filter cylinder. The beneficial effect of the present invention is as follows. The present invention can be used in vehicle using fuel, engine and industry, environmental filtering, according to the flow rate and different designs of material. By a novel structure design, the lifetime of the present filter is greatly improved. During the entire life cycle of the filter, an apparatus which uses the present filter does not need to replace the fuel filter.

Systems and methods for filter orientation on a control valve are provided. In particular, systems and methods are provided for rotationally orienting a filter retention feature with respect to an application fluid passageway to control forces and stresses exerted on the filter retention feature. Additionally, methods for manufacturing a control valve are provided that enable a rotational relationship between a filter retention feature and an application fluid passageway to be constrained.