The "HydroTAF" Automatic self-cleaning filter is a fully hydraulically operated unit that is controlled electronically or hydraulically. The filter is
designed To work with various types of screens in filtration degrees from 500 To 50 micron, and is available in 2", and 3" inlet/outlet diameter.
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Filter components:
The filter comprises of the following components: Filter housing, lid and tightening nut, screen element, flushing chamber, self-cleaning
mechanism and control system.
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Filtering process:
The water enters through the inlet pipe into the screen area from inside out. The "filtration cake" is accumulated on the screen surface and
causes head loss To develop. A pressure differential pilot senses the pressure differential across the screen and when it reaches
0.5 bar (7 psi) the pilot generates a hydraulic command that starts the self-cleaning process.
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Self-cleaning components:
The self cleaning mechanism comprises the following components: Hydraulic turbine, suction scanner, piston assembly, exhaust valve and an
external valve where applicable.
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The self-cleaning process:
The hydraulic command generated by the pressure differential pilot, causes the exhaust valve To open.
The exhaust valve, which is open To the atmosphere, allows water To flow through the turbine as well as through the suction scanner nozzles.
The suction scanner scans the entire screen surface in a spiral movement by a combined action of the hydraulic turbine and the reversible worm
unit. The turbine rotates the suction scanner that sucks in the dirt from the screen surface and expels it out through the exhaust valve.
The electronic controller or the hydraulic timer gives a hydraulic command To End the self-cleaning cycle. The self-cleaning cycle takes approx
10 - 16 seconds, depending on the operating pressure.
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