Vacuum conveying systems use a pressure gradient to move the product from the inlet to the outlet of a piped system. These systems use a vacuum generator at the delivery end of the pipe to create a vacuum that pulls the material through, unlike pneumatic conveying systems which use air compressors at the inlet to push the material. In addition to the vacuum generator, a basic vacuum conveying system consists of a pick-up nozzle, the conveying line, bends, diverter valves, and the receiver. Considerations for choosing a vacuum conveyor include the particle size of the product, length and complexity of the flow path, the desired flow rate, sensitivity of the product and dilute or dense phase operation. Vacuum systems are suitable for transporting powdered and granular materials for processing and filling operations in various industries.