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Vacuum Conveying
A basic vacuum conveying system uses a metering device at the inlet, a pipeline, receiver, and exhauster. As there is no positive pressure at the inlet it is not necessary to fit a rotary valve, so large particles can be fed into the system without damage. Another possible benefit results from the system being under negative pressure; potential leakage of toxic or hazardous products is prevented. The conveying rate for a vacuum system is limited by the negative pressure that can be created by different exhausters. For example, positive displacement type units are limited to 500 mBar, while a multi-stage turbo exhauster has a practical limit of 350 mBar.