Screen sizes are available from 3000 to 20 micron.
The effective filtration area of a screen filter can be quite high and the initial "clean" head loss is quite low. The PD
however, can build up quickly, making an effective cleaning schedule essential. Screen filters can be cleaned manually
or automatically, like all other types of filter.
Manual cleaning usually involves removing the filter element and hosing/brushing it clean. Automatic cleaning is
activated automatically as the particles, trapped on the inside surface of the fine screen create a differential pressure
buildup. A number of cleaning methods are available:
Screen FiltrationTechnology
Rotating brush cleaning:
A brush rotates over the screen element dislodging the "filter cake"
and a purge valve flushes the dirt out through a drain while the
system is under pressure.
Vacuum scanner cleaning:
A rotating vacuum scanner lifts "filter cake" off the screen
without actually making physical contact. The rotation and
linear movement of the scanner allow it to reach every part of
the screen in minimal time. This system can be very effective
and does not damage the screen as a brush could.
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