Rotary valves are used as a quantity measuring unit eg. under a silo. Depending on the flow a very accurate measurement can be met. Standard valves as well as airtight constructions can be manufactured (pneumatic transport). Inlets and outlets are being adapted to the situation.
Flows of 30 m³/h are possible. Special constructions with for example adjustable plates or wear-resistant steel varieties can be made according to application.