filter control and regulationReading time:
A filtering battery may comprise n filters that have to be supplied as evenly as possible, especially avoiding any over-feed to one of the filters. Special attention has to be paid to this problem when the battery only has two or three filters.
In pressure filter batteries, the supply pressure is usually high and control modes can be simplified: using a diaphragm and, if required, a regulating valve.
Gravity filters have three main hydraulic operating modes :
- constant rate, variable head filter;
- constant rate automatic compensated-clogging filter;
- variable (or declining rate) filter.