Why should open silencers be used for vacuum generators?

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Why should open silencers be used for vacuum generators?

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Over time, a closed silencer becomes contaminated from inside with dirt particles which are larger than the porosity of the body of the silencer. As the contamination increases, back pressure gradually develops in the vacuum generator (vacuum performance reduced – maintenance necessary). With an “open silencer”, dirt particles can be sucked in via the laval nozzle, leaving the silencer again with the air flow. Advantages: Reliable, safe to operate and maintenance-free.

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