Description Of The Operational Functions - SAB F450 Operation Manual

2.2.1

Description of the operational functions

The operation of the automatic backflush filter F450 is divided into the normal
operation and the flushing phases:
State: 05.02.2016 – 1.3
Normal operation
The filter is in the normal filtration phase. The
flushing valve is closed and the piston
mounted in the cover is in its initial position
with the flushing disc outside of the filter bas-
ket. The particles are deposited in the filter
insert in accordance with the laws of fluid me-
chanics, starting at the top and continuing
towards the bottom. The running time of this
filtration phase is dependent upon the level of
contamination of the medium.
Because of the design and the fluidic condi-
tions no particles are deposited in the bottom
area of the strainer in this phase.
Filtration and first flushing phase
In this flushing phase the flushing valve
opens and generates a pressure drop relative
to the system pressure prevailing in the pipe
work system. By means of this pressure drop
the coarser and easily cleanable particles are
flushed out of the strainer insert. The filtration
continues throughout this process, while the
flushing flow rate is defined and limited by an
orifice that is located in the flushing outlet
pipe.
The flushing process is triggered either by
monitoring of the differential pressure, or by a
time-based control algorithm resp. it will be
activated by external or by interface.
Georg Schünemann GmbH, Bremen
Automatic Backflush Filter F450
2-2