A supercritical fluid power generation system includes an automatic filter cleaning apparatus, which is used in an automatic filter cleaning method. The system includes a cooler configured to cause a phase change of a working fluid from a gaseous state to a liquid state or to cool the working fluid to a low temperature; a fluid pump configured to receive and compress the working fluid from the cooler; a heat exchanger configured to heat the working fluid via a heat exchange with the working fluid which has passed through the fluid pump; at least one turbine configured to expand the heated working fluid and connected to a generator to produce electric power; a plurality of transport pipes in which the working fluid flows; and plural filter lines configured to remove, via back-flushing, a foreign substance included in the working fluid present in at least one of the transport pipes.

This specification describes an intake filter for use, for example, in a system that collects greywater from baths or showers for re-use in toilet flushing. The intake filter provides essentially dead-end filtration. An influent by-pass may be provided, but the filter is cleaned as required to reduce use of the by-pass. Cleaning is performed when permeability of the filter declines. An upstream sensor may be used to detect the permeability of the filter. In one cleaning method, flowing water, optionally with air, is used to backwash the filter. The impulse of the flowing water also moves one or more valves to direct backwash water to a sanitary drain. For example, pumped effluent may impinge against a first flap to close an effluent drain, the first flap being mechanically linked to open a flap covering the sanitary drain.

Embodiments of the invention provide a filter for use in filtering a fluid slurry that includes particles of varying size, such as pool water including debris. The filter is in electrical communication with a sensor and includes a housing having an inlet to receive the fluid slurry, an outlet, and an internal chamber. An actuator can be coupled to the filter media to move at least a portion of the filter media to vary a dimension of the pores. The filter also includes a controller connected to the actuator that is capable of receiving a signal from the sensor and controls the actuator to change the dimension of the pores based on the signal.

Disclosed is an automatic flushing type pre-filtering device, that includes: a valve head set, a filter cartridge set, a movable rod piece, and a drain valve set. The filter cartridge set includes: a cylinder body; a filter cartridge, disposed in the cylinder body, the filter cartridge includes a filter net rack and a filter net disposed on the filter net rack. A first chamber is formed between the filter cartridge and the cylinder body, and a second chamber is formed inside the filter cartridge. The movable rod piece is provided with a hollow portion inside, and the movable rod piece is disposed in the second chamber. A water separation piece is disposed between the movable rod piece and the filter net rack. A plurality of through holes are disposed on the movable rod piece corresponding to a position of the second chamber.

A filter apparatus is disclosed herein that includes a filter, such as a cartridge, positioned within a housing. The housing includes a lower-section housing and a cover assembly removably attached to the lower-section housing. The filter apparatus has multiple ports and valves, such as a valve associated with the cover assembly, so as to allow a user to easily switch between various operations on a pool filter, such as between a backwash mode and a filtration mode. The filter apparatus also employs a cage positioned around the cartridge, thereby between the housing and the filter. The cage provides additional support to the cartridge so as to reduce wear and tear of the cartridge. The cover is rotatable about the lower-section housing so as to allow a user to position ports on the cover in any direction.

The filtering system comprises an inner flow or an outer flow, a shaft, a backwash outlet, a backwash valve, a volume separator rotating disk containing a backwash hole located between the insert and back wash outlet, and a filter cleaning mechanism enabling the cleaning of the dirt particles generated on the filter insert without opening the filter cover. The filtering system contains at least two flow cross-section reducing plates, realizing the speedy passage of the liquid in the insert through the plurality of gaps providing a plurality of reduced flow cross-sections created between the flow cross-section reducing plates and the surface of the insert. A pressure drop is generated during the speedy passage of a liquid through the plurality of gaps. The surface of the insert is cleaned with the passage of the liquid from outside of the insert to the inside of the insert or vice versa.

A four-way valve for a backflush filter system comprises a valve body (3) and a rotating valve core (2) having a valve rod at one end of a central shaft. A valve core port IV (16) is arranged at the other end of the central shaft of the valve core (2). Three ports are arranged in the radial direction of the valve core (2): a valve core port I (13), a valve core port II (14) and a valve core port III (15). The valve body (3) encasing the valve core (2) also has four ports. Three radial ports are respectively a valve body port I (9), a valve body port II (10) and a valve body port III (11), and the other port is an axial valve body port IV (12). By increasing the sizes of the relevant ports and sealing end surfaces, the four-way valve solves the problems that a backflush effect is affected by insufficient inflow rate during backflush of a four-way valve in the prior art, the distribution of the relative positions of three ports of the valve body is single, and sealing is difficult.

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).

The present invention provides a tubular filter element 3 configured to filter fluid by allowing the fluid to pass therethrough from the inside to the outside, and to be backwashed by allowing the fluid to pass therethrough from the outside to the inside. The filter element 3 includes: a tubular filter member 31; first and second end members 32 and 33 having openings and respectively provided at first and second ends of the filter member 31; and a trapped object remover 34 provided in the interior of the filter member 31, and movable by the fluid flow while its outer periphery slides in contact with the inner periphery of the filter member 31 to remove trapped objects. A flow rate restricting means for restricting the fluid flow rate through the second end member 33 is provided on the second end side of the filter member 31.

The invention relates to a filter apparatus (10) comprising a plurality of filter elements (20) which can be received in a filter housing (12) having a filter inlet (50) for a fluid to be filtered and a filter outlet (52) for the filtered fluid, characterised in that a pressure control device (42) has at least one control plate (58) which, located inside a connection chamber (14), laterally passes over individual upper element openings (54) of the filter element to be backwashed (20), in a predefinable sequence, covering the opening to an increasing degree and then exposing the opening again, and in that a discharge opening (46) of the backwash device (44) is, at least in part, fluidically connected to a lower element opening (56) of the filter element (20) to be backwashed, as the pressure control device (42) moves towards the upper element opening (54).