The rotary valve works like an air lock and ensures seperation between the working vacuum in the filter line and material. The valve separates and transforms the straw transport from pneumatically to mechanical transport. Material drops into compartments in the top of the valve and rotates  180 degree to the bottom position, where the material can fall out from the compartment by gravity.

Rotary valves can be delivered in sizes from 120 m3/hour and up to 2000 m3/hour and can work with suctions from 25000 and up to 10.000 Pa