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From a single source

CLEAN FILTER PRESSES SAFELY: GEMÜ ball valves protect compressed air networks
In water treatment and product filtration, filter presses separate solids and liquids in substances such as slurries or suspensions. The mixture of substances to be separated is pressed against the filter cloths via a pump with a pressure of 10–20 bar. The solid parts of the mixture are caught by the filter, forming a filter cake. If the filter press is full, compressed air is used in some procedures to dry the filter cake.
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