A filter element includes a first end cap, a second end cap, and a ring of filter media disposed between the first end cap and the second end cap. The ring of filter media circumscribes a central cavity. The filter element also includes an air-bleed conduit axially extending through the central cavity. The air-bleed conduit includes a first portion integrally formed with the first end cap and a second portion integrally formed with the second end cap. The second portion is configured to fluidly connect to the first portion.

The invention relates to a particle filter device (1) comprising: a fluid inlet (20), a fluid outlet (21), a first fluid flow circuit (31) comprising a first filter zone (2) having a first filter surface (S.sub.1), a second fluid flow circuit (32) comprising a second filter zone (3) having a second filter surface (S.sub.2) and a constriction (4) having a constant hydraulic resistance so that, in operation, a first portion of the fluid flows through the first flow circuit (31) by passing through the first filter zone (2) and a second portion of the fluid flows through the second flow circuit (32) by passing through the second filter zone (3) and the constriction (4), and the first filter zone (2) reaches a predetermined clogging condition before the second filter zone (3).

The present invention teaches a method and apparatus to quickly and inexpensively implement advanced, bypass grade, fine, or additional filtration to engines and hydraulic systems. The present invention has the ability to make quick hydraulic connection to the engine or hydraulic system, where oil is super cleaned, without major modifications as is the paradigm by traditional bypass filtration systems and without removing any lubricant from the engine or system that the present invention is connected to, as is the paradigm of traditional bypass filtering systems. When connected to the normally provided stud for the spin-on oil filter in an engine or hydraulic system, the net effect of interest to the present invention is that by simply placing the adapter at the point of connection of the spin-on oil filter, many of the necessary plumbing associated with the traditional bypass filter installation is obviated, as is the energy and labor intensive process of seeking for a pressure point and a return of the oil. The present invention relies on the differential pressure effected by either alone or in combination of an orifice restriction to effect flow of either engine oil or hydraulic fluid, to route through a high efficiency filter, in trapping and low pressure to flow, an amount of dirty oil and then to return same amount to reconstitute a total flow on the system, whereby supplemental or advanced filtration is quickly connected to an engine or hydraulic system.

A filter system including a designated filter cartridge having a geometric projection, a flow restriction valve that controls fluid flow out of the filter system, and a priming pump configured to prime the filter. The flow restriction valve includes an opening keyed to the geometric projection such that the geometric projection engages the opening and actuates the flow restriction valve. The flow restriction valve includes at least one fluid flow check valve configured to allow the priming pump to prime the filter system.

A no filter, no run filtration system that is designed to verify that a filter cartridge is present to safe-guard against damage to fuel injectors, associated fuel components, etc. and engine malfunctions. Fuel flow to the engine is prevented altogether or permitted in an amount insufficient to allow engine operation if a filter cartridge is not installed, and an appropriately designed filter cartridge is required to be used in order to permit sufficient fuel flow for engine operation. In one embodiment, a flow restriction valve is provided that includes a ball.

A filtration device, in particular a disposable filtration device, has a flow path in which a filter element and an integrated flow reducer are arranged one behind the other. The flow reducer is adapted to be brought to a first operating position, which permits a defined first volume flow rate, and at least to a second operating position, which permits a defined second volume flow rate which is smaller than the first volume flow rate.

A filter system including a designated filter cartridge having a geometric projection, a flow restriction valve that controls fluid flow out of a filter system, and a priming pump configured to prime the filter. The flow restriction valve. The flow restriction valve includes at least on fluid flow check valve configured to allow the priming pump to prime the filter system.

A filtration system includes a filtration device having filter slats positioned in a linear array and connected via a supporting structure, the filter slats being parallel to one another and being fixed at an angle relative to the linear array; and pores created by the filter slats; a fluid flow chamber to hold the filtration device such that fluid passes through the filtration device, the fluid flow chamber having a filtration channel with an inlet to receive fluid and an expulsion channel in fluid communication with the filtration channel; a filtrate channel in fluid communication with the filtration channel such that fluid passes through the filtration device between the filtration channel and the filtrate channel, the filtrate channel having a filtrate channel outlet; one or more pressure modulating structures in fluid communication with the fluid flow chamber such that the pressure modulating structure modifies pressure in the fluid flow chamber.

A screen intake has a central body with two screens attached on either end. Each of the screens has an interior that communicates with a hollow of the body via flow modifiers. These flow modifiers include one or more pipes disposed in the interior of the screens and through passages in ends of the body. A flow control support device disposed within the body supports the body's sidewall and divides the hollow into at least two portionseach communicating with flow from one of the flow modifiers. The device can include one or more plates disposed adjacent one another within the internal hollow with a peripheral edge attached to an inside of the body's sidewall. At least one of the one or more plates can be solid, or one or more of the plates can define openings therein allowing passage of at least some fluid therethrough.

A filter apparatus has a plurality of filter elements (21) accommodated in a filter housing (1) with a filter inlet (11) and a filter outlet (13). During the operation one of the filter elements (21) can be backflushed by a backflushing device. The backflushing device includes a pressure control (7) to support the backflushing. Each filter elements (21) is accommodated in an element housing (30). The element housings (30) with the filter elements (21) performing the filtration process are connected to the fluid outlet (13) by their one open ends (33) in a fluid conducting manner. The element housing (30) of the filter element (21) being backflushed is exclusively connected with its open end (33) to the pressure control device (7).