Rotary filters, process rotary filters and filter dryers find application predominantly in the pharmaceutical industry. They perform all process operations in one: they work as pressure filters and vacuum filters; they suspend, homogenize and filter the medium; they dry the filter cake and scrape it out

of the agitator by offsetting the agitator axially as much as 400 mm. Typical mechanical seals for machines of this type feature a rotating counter ring and wear-resistant face materials (e.g. Si-SiC); they are designed for top and bottom drive and can be completely sterilized.