STF-Filtros FMA-2000 series, Installation, Operation And Maintenance Manual

Page: 11 / 47

Installation, operation and maintenance manual - FMA 2000
Ref: 2000/CPF01/230/VH 11
5. – FMA-2000 PERFORMANCE
 Water gets into the filter through the prefiltration chamber, where thick particles are
retained, as it was a strainer.

Water gets into the filtering chamber, goes through from inside to outside the FILTERING
SCREEN, producing the SURFACE MECHANIC. High quality water is obtained
according to the filtration degree choosen for the filtratrion screen which can vary from 10
microns to 2000 microns.
 Dust remains on the thin screen interior what produces head loss between the filter inlet
and outlet gradually. Two analogic transducers will indicate the backwashing sequence
when the DP becomes 0.3 (3 m.c.a). There are other possibilities to make the filter
backwashing: Time backwashings, time and pressure combination, continuous
backwashing option.

When the pressure switch indicates 0.3 bar, the drain valve receive the opening order,
then it generates a pressure difference between outside (atmospheric pressure) and the
inside of the filter (working pressure) that is why fast running water which is produced,
goes through the screen and then goes outside through the nozzles internal orifice.
Besides this, at this very moment the starting order is also sent to the engine.
 The result of these actions is: the suction effect of the nozzles on the screen dust and the
suction scanner spiral movement in the inside of the filter.

During the backwashing process that lasts 25 seconds, water is still being filtered and
goes on flowing to the system or application. This fact whis is is due to the filters design
allows that the backwashing water consumption is MINIMUM and the working system is
CONTINUOUS