The filtration principle is based on a filter strainer, with the solid particles being retained on the inside of the filter element. In the cleaning process, a vertical or a rotating scraper scrapes the solids into a sludge chamber in the bottom of the filter. The chamber is designed in such a way that a high concentration of solids can be retained before purging. The scraping action is activated either automatically by differential pressure across the filter or at fixed time intervals. The concentrated slurry is drained at appropriate intervals through the discharge valve with pneumatic actuator at the bottom of the filter. This means that product loss is kept at an absolute minimum. Drainage in batch processes may also be controlled manually in cases where it is only required at the end of the batch.
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