the filter-strainer
Straining Process
Water flows through the cylindrical strainer
element from the inside-out allowing the strainer screen to trap debris on the
inner surface. Debris collects on the inner surface of the screen forming a
"filter cake".
Self-Cleaning process
The filter cake causes a pressure
differential between the inlet and the outlet of the strainer. When this
differential reaches the preset value of 7 psi, the self-cleaning process
automatically starts. This operation consists of opening an exhaust valve
located on the housing lid and starting an electric motor, which turns two
stainless steel brushes which sweep the inner surface of the cylindrical screen.
The particles trapped on the screen are dislodged by the revolving brushes and
flushed out through the open exhaust valve. Service flow of strained water is
uninterrupted throughout the approximately 20 second cleaning process.
Control System
The ABF is equipped with a pressure differential
switch (PDS) that transmits an electric signal to the control board, initiating
the flush cycle. A solenoid operates the exhaust Valve by means of a hydraulic
command or compressed air.
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