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What is an "active vacuum" filter?

The term 'active vacuum' indicates that the vacuum in the clean chamber is used to actively control the filtration process. The vacuum in the clean chamber is not turned on or off but is increased or decreased in response to the process conditions.

The vacuum is increased as more dirt accumulates on the filter cloth but it is also increased and decreased in response to fluctuations in the incoming flow or variations in the amount and nature of the dirt in the incoming flow. That way the filter cake build up on the filter cloth is promoted and optimised and compression of filter cake and cloth is avoided.