Abstract:
Liquid filter devices, particularly for irrigation systems are known to comprise automatic, periodic reverse-flow rinsing arrangements, whereby water is flushed in the opposite direction to release clogged particles from the filter member. The disclosed devices utilize the reverse, flushing water flow to release the filter member of the device from its normal, stationary position, and rinse it by jets. The jets are also useful to impart a rotatable movement to the filter member. In the case of disc filters, the discs become released and spaced from each other, and individually spin during the rinsing thereof.
Abstract:
A filter device is disclosed, comprising two compartments within a housing. The first compartment includes a filter element, of the screen or the disc types, with communication to the filtered fluid outlet of the housing. A controllable valve communicates the first compartment with the inlet of the housing across the second compartment. A drain valve connects the first compartment with outside the housing. For flushing the filter element by reverse-flow, the first valve is closed and the flushing fluid drains through the drain valve. In a further embodiment two or more filter elements and associated compartments and valves are installed, in parallel, within the same housing, so that by stopping the filtering operation of one of the filter elements, it becomes flushed with the product, filtered fluid of the other element. The filter elements are preferably of the disc-type, and provided with a hydraulic piston and cylinder assembly for compacting and releasing the discs during the filtering and flushing modes of operation, respectively, to effect a more thorough rinsing of the discs. In addition, the displacement of the discs compacting cylinder can be controlled from outside the system.
Abstract:
A combined pressure-regulated and check fluid flow valve is disclosed which is adapted to be installed directly on the pipeline and serve also as a protection against water hammer in case of sudden pressure failure in the line. The valve is installed within a housing configured as a uniform extension of a pipeline to which the valve is connected. The structure consists mainly of a freely reciprocable differential piston associated with a fixed differential cylinder, a freely reciprocable valve member at the inlet side and a freely reciprocable piston at the outlet side of the housing.
Abstract:
A filter device is disclosed in which the filter element is made to spin about itself during reverse-flow, flushing operational stage thereof. The device comprises a sprinkle member rotatably supported inside the filter element. Reaction forces generated by water jets forced through the sprinkle member cause its rotation, and the filter element is then caused to rotate by the jets sprayed against its inner surface. In a preferred embodiment disclosed, the filter is of the disc-type, provided with a hydraulic cylinder adapted to release the compact engagement of the disc. The discs become separated from each other, each disc being imparted the rotational movement of the rotating jets.