Vacuum is normally generated by a vacuum pump unit. The vacuum is measured by a sensor transmitter in the cyclone and controlled by an automation logic system.
The vacuum is created in the pipeline prior to the vacuum conveying, when a discharge is requested at a feeding station. When a vacuum of 250 mbars is reached, the feeding station opens a gate valve and the food waste is conveyed all the way to the vacuum cyclone. The food waste remains in the cyclone while the air is rejected from the top of the cyclone, separating the food waste and the air.
Systems are installed as two line systems, each of which features a vacuum station including a cyclone and vacuum pump units. Cross connection is provided between the two vacuum stations.