Automatic Backflush Filter F450
State:
05.02.2016
– 1.3
Georg Schünemann GmbH, Bremen
2-3
Filtration and second flushing phase
The flushing valve is open. The pneumatic
driven piston, together with the flushing disc,
moves into the strainer insert up to a 2/3
depth. The large local increase in velocity in
the gap between the flushing disc and the
strainer insert generates a drop in static
pressure (the Bernoulli effect). Only the part
of the region to the flushing disc is the exter-
nal pressure on the clean side of the filter
higher than in the region between the flush-
ing disc and the filter insert. This generates a
“suction” of the dirt particles from the filter
element.
By means of the flushing valve that is open
at the same time, and the pressure drop
thereby generated, the contamination is
flushed out of the filter.
Filtration and last flushing phase
While the flushing disc is reaching its initial
position the flushing valve remains open.
This enables the remaining particles to leave
the filter unit. During the upwards movement
of the flushing disc the lower 1/3-region of
the filter insert is also cleaned by means of a
self-cleaning effect produced by the flow
conditions generated in accordance of the
Bernoulli.