Suction weighing systems are designed to transport bulk quantities to a predetermined location in the automatic production process and to weigh them precisely before they are transferred into mixing, homogenising and dispersing processes. Suction weighing systems consist of conveying scales, a multiport valve and an electromechanical weighing device. A variety of concepts can be used, dependent on the application, such as a single pipe system, a multiple-pipe system, a central weighing system or even a suctioning mixing vessel.