Operating instructions AutoFilt
®
RF4 English
BA RF4-Standard-deutsch/ englisch/ französisch 01/2007 HYDAC-Document: 03191177f Page 11
3 TECHNICAL DESCRIPTION OF THE BACK-FLUSHING FILTER
The AutoFilt RF4 back-flushing filter is a fully automatic self-cleaning filter
designed to extract particles from low-viscosity fluids.
When the set operating parameters are exceeded, the back-flushing filter
automatically initiates regeneration (back-flushing) of the contaminated
filter elements.
The back-flushing filter operates continuously, so that the filtration process
is not interrupted when the filter elements are flushed.
The back-flushing filter requires minimum maintenance. No elements need
to be replaced under normal operating conditions.
3.1 Description of the function
Figure 1: Function principle of the back-flushing filter
Filtration
The fluid to be filtered flows through the slotted-tube filter elements of the
back-flushing filter, passing from the inside to the outside.
During this process particles of contaminant collect on the inside of the
filter elements.
As the level of contamination increases, the differential pressure between
the contaminated and clean sides of the filter increases.
When the differential pressure reaches its pre-set trigger point, back-
flushing starts automatically.
Filtration Filtration and Backflushing
filtrate
filtrate
contaminated medium contaminated medium
back-flushing
fluid
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