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UDI 12/2019
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Manual
UdiMatic
2 - OPERATING PRINCIPLE
A. Normal flow pattern
Raw water enters the filter through the inlet port, passing through the fine screen (1) and out to the outlet
port. The sediments stopped on the screen (1) create a "cake" of sediment. This "cake" improves
filtration efficiency as it performs a finer filtration. The sediments accumulated on the screen, create a
differential pressure across the screen. The differential pressure rises until the predetermined value is
reached [normally 0.5 bar].
A differential pressure switch will activate the self cleaning process. A timer backup guarantees that the
time passed from the last self cleaning process will not be longer than the preset value determined by the
user.
B. Self cleaning
On a flushing command, the flushing valve (6) opens to the atmosphere and creates pressure drop in the
motor chamber (5), causing the dirt on the screen to be sucked in by the nozzles (2). This pressure drop
also moves the piston (7) and the collector in a linear movement. In addition, the hydraulic motor (4)
rotates the collector.
These two processes performed simultaneously create a spiral movement of the nozzles so they cover
the whole screen surface, enabling complete and effective cleaning of the screen.
The entire process takes seconds (according to specific model), upon completion of the cleaning process
the filter returns to its initial position.
This self cleaning flushing cycle can be initiated by DP switch, timer backup or manually.
out
in
flushing controller
to drain
1
3
5
4
7
2
6
