A filter device is disclosed comprising a filter which is used to clean a fluid flow of particulate contamination in a specifiable flow direction, having a fluid inlet for supplying an unfiltered medium flow, a fluid outlet for removing a filtrate flow, and a discharge opening for discharging a backflushing fluid produced while backflushing the filter against the specifiable flow direction using a backflushing device, wherein as the particulate contamination being cleaned out of the fluid flow by the filter increases, the differential pressure between the fluid inlet and the fluid outlet increases, characterised in that a valve device is arranged downstream of the discharge opening, viewed in the fluid flow direction, said valve device regulating the discharge rate of backflushing fluid as a function of the differential pressure.

A hybrid filter assembly for an aquatic application is provided in the form of a vessel, a first filtration stage, a second filtration stage, a bypass assembly, and a controller. The vessel includes a first port which receives fluid from the aquatic application. The first filtration stage and the second filtration stage are retained in the vessel. The first filtration stage is designed to filter particles imparted with a first size, while the second filtration stage is designed to filter particles imparted with a second size. The bypass assembly is in fluid communication with a second port the vessel. The controller is in communication with the bypass assembly, and the controller actuates the bypass assembly to alter an operational state of the hybrid filter assembly.

A filter arrangement for a fluid handling system, includes: a filter housing having a fluid inlet, and first and second outlets; a filter element displaceable in a linear direction in the filter housing to a first position and to a second position; and a valve arrangement displaceable in the linear direction together with the filter element. The valve arrangement comprises first and second valve discs configured to control a fluid flow in the filter housing and through the filter element. When the filter element is displaced in the first position, fluid flow is directed through the filter in a first direction, and the first valve disc is displaced to close the second outlet; and when the filter element is displaced in the second position, fluid flow is directed through the filter in a direction opposite the first direction, and the second valve disc is displaced to close the first outlet.

A filter system and method for filtering. The filter system (SJ) having at least two filters (S1, S2) having filter elements for filtering a material to be filtered. The material to be filtered is conducted to a dirty side (LP) of the filter and filtered material is conducted out from a clean side (PP) of the filter. A clogged filter is washed by counterflow washing in which the filtered material is conducted from the clean side of one filter to the clean side of another filter.

The present disclosure belongs to the technical field of water treatment valve bodies, so as to solve the technical problem that an effective area of a water inlet and outlet hole inside a valve body cannot be simply and effectively reach an effective area of a water inlet and outlet pipe orifice outside the valve body. Based on this, a multifunctional water treatment filter valve is provided, including a valve body, a movable valve plate, a fixed valve plate, and a driving device. The fixed valve plate is fixedly mounted in the valve body; the movable valve plate and the fixed valve plate are in rotatable fit in the valve body; and a side wall of the valve body is provided with a water inlet, a water outlet, and a drainage opening.

In some embodiments, a system for pre-wetting a filter includes a filter, a piping system, a first gas, a second gas, a first buffer tank, and a second buffer tank. The first gas drives the solvent to clean the filter. The two buffer tanks store the solvent discharged from the filter. The second gas selectively drives the solvent in the first buffer tank to return to the filter and then to be discharged into the second buffer tank. Alternatively, the second gas selectively drives the solvent in the second buffer tank to return to the filter and then to be discharged into the first buffer tank.

A method for operating a filter device for polymer melt to be filtered, said filter device incorporating at least one first large-area filter, which has a plurality of filter elements, in a first filter chamber; and a first drain for the filtered polymer melt from the first filter chamber. The polymer melt to be filtered is conveyed under pressure through the filter device. The polymer melt to be filtered is fed to the first large-area filter in the filter direction, and filtering is continuously performed via the first large-area filter. During a backflushing operation, at least one filter element is cleaned of impurities and backflushed by reversing the flow direction of the filtered polymer melt and passing it through the filter element.

A method and apparatus for filtering fluid for a food processing system is disclosed and includes a fluid inlet, a filtered outlet, a drain outlet, two filters-each having inlets, inlet valves, drain outlets, drain valves, filtered outlets, and return valves. A first recycling flow path includes an inlet valve, an inlet, a filter, a return valve, and a filtered outlet. A first drain flow path includes the inlet valve, the inlet, the filter, the drain valve, and the drain outlet. A second set of like flow paths for the second filter is provided. A controller is connected to control each of valves, and the controller has a first filter purge module, a first filter filter module, a first filter power purge module, a first filter off module, second filter purge module, a second filter filter module, a second filter power purge module, and a second filter off module.

Embodiments described herein relate to a post filter set configured as parallel post filter branches. Each post filter branch includes a post filter, an upstream multi-position valve, and a downstream multi-position valve. Each the upstream and the downstream multi-position valves are actuatable to at least two configurations to enable backwashing and filter to waste operations using fewer valve operations. For backwashing, a head pressure from the combined output of other post filters in the post filter set is leveraged such that backwashing a particular post filter can be performed as a pumpless operation.

A system. The system includes a reuseable oil filter, a first port, a second port and a valve assembly. The reuseable oil filter has an inlet and an outlet, and includes a housing and a filter element positioned within the housing. The valve assembly is in selective fluid communication with the reuseable oil filter, the first port and the second port.