Pond filter unit and a method for operating a pond filter unit (1). A control unit (12) controls the operation of the pond filter unit (1), including the cleaning cycle of the filter (2′, 2″, 2′″). The pond filter unit (1) further comprises one or more plugs (14) for connecting one or more auxiliary devices, such as a separate pump, one or more additional pond filter units, illumination devices/lamps, air pumps, and/or feed automats. The control unit (12) of the pond filter further controls the one or more auxiliary devices connected to the plugs (14), such as pumps, air pumps, automatic feeding devices based on input settings for each of the one or more auxiliary devices. The control unit (12) further controls the cleaning cycle for cleaning of the filter (2) in the vessel (3). The cleaning cycle comprises a sequence of backwash and/or a mechanical filter cleaning sequence where a filter cleaning motor unit (6) rotates the filter cleaning device (7) in the vessel. During backwash, the valve (8) directs the water to the waste water outlet (11). The filter unit allows to control the one or more auxiliary devices by the pond filter control unit (12), and to coordinate the control of the additional devices in relation to the control of the filter.

Disclosed herein is a method, system, and apparatus, for filtering liquid, which uses negative air pressure to draw liquid stream through a filter screen and which cleans that filter screen by periodically modulating the negative air pressure to allow the liquid stream to wash any contaminants from the surface of the filter screen.

The use of electrical analyzers to monitor and control separation processes is described. The electrical analyzers monitor electromagnetic properties of materials being treated, and are used to adjust the separation process based on the changing electromagnetic properties. The electrical analyzers generally sample process fluid and apply a static or varying electric field to the process fluid while monitoring energy uptake of the process fluid from the electric field by measuring electrical parameters of the circuit. The changing electrical response of the process is related to changing process conditions and can be used to control the process.

The use of electrical analyzers to monitor and control separation processes is described. The electrical analyzers monitor electromagnetic properties of materials being treated, and are used to adjust the separation process based on the changing electromagnetic properties. The electrical analyzers generally sample process fluid and apply a static or varying electric field to the process fluid while monitoring energy uptake of the process fluid from the electric field by measuring electrical parameters of the circuit. The changing electrical response of the process is related to changing process conditions and can be used to control the process.

Embodiments of the present invention are a filtering element, a filtering equipment and a water circulation cleaning system. In an embodiment, a filtering element includes a filtering screen and filter particles adhered to one side of the filtering screen, sizes of the filter particles being gradually increased in a direction from the one side to the other side of the filtering screen. Meanwhile, there also provides a filtering equipment including the abovementioned filtering element and a water circulation cleaning system including the abovementioned filtering equipment.

A water purifier that includes: a filter unit that is configured to purify water; a cooling unit that is configured to cool water purified by the filter unit using cooling water; a water discharge unit that is configured to discharge water cooled by the cooling unit; a cold water flow path that couples the cooling unit to the water discharge unit and through which water cooled by the cooling unit passes; a cold water discharge valve that is coupled to a first side of the cooling unit and that is configured to control water flow inside the cold water flow path; and a check fitting unit that is coupled to a first side of the water discharge unit and that is configured to block pressure change inside the cold water flow path is disclosed.

A water purifier that includes: a filter unit that is configured to purify water; a cooling unit that is configured to cool water purified by the filter unit using cooling water; a water discharge unit that is configured to discharge water cooled by the cooling unit; a cold water flow path that couples the cooling unit to the water discharge unit and through which water cooled by the cooling unit passes; a cold water discharge valve that is coupled to a first side of the cooling unit and that is configured to control water flow inside the cold water flow path; and a check fitting unit that is coupled to a first side of the water discharge unit and that is configured to block pressure change inside the cold water flow path is disclosed.

A suction filter for an automatic transmission utilizes two different types of filter media: a coarse filter media and a fine filter media. The two types of media are arranged in series within a housing such that fluid flows through only one of the two filter media. A hinge valve is arranged in series with the coarse media. The hinge valve passively opens in response to a pressure differential. The hinge valve defines a non-zero flow area when in the closed position and an increasing flow area as it opens. The flow restriction associated with the hinge valve permits a larger ratio of coarse media area to fine media, thereby decreasing the flow restriction when the oil is cold without decreasing the clean-up rate in normal operating conditions.

A suction filter for an automatic transmission utilizes two different types of filter media: a coarse filter media and a fine filter media. The two types of media are arranged in series within a housing such that fluid flows through only one of the two filter media. A hinge valve is arranged in series with the coarse media. The hinge valve passively opens in response to a pressure differential. The hinge valve defines a non-zero flow area when in the closed position and an increasing flow area as it opens. The flow restriction associated with the hinge valve permits a larger ratio of coarse media area to fine media, thereby decreasing the flow restriction when the oil is cold without decreasing the clean-up rate in normal operating conditions.

A modular filtration platform having at least one manifold head and at least one respective filter cartridge assembly. Each manifold head is connected to one another to establish a water flow in a series or parallel manner. Each filter cartridge assembly is releasably secured from rotation relative to the manifold head by a locking mechanism. An aperture on the filter cartridge assembly annular collar mates with a protruding resilient extension on either the manifold head or support bracket. Alternatively, an aperture on the filter cartridge assembly annular collar and an aperture on the manifold head annular collar mate with a protruding member from a locking ring extending through both apertures. An integrated sensor package may be integrated with the system for true managed water visible/audible indications and Wi-Fi interface to facilitate virtually instantaneous response times for filtration needs.