The Rotary valve is an open type valve. This means that the material is pushed with a low pressure against a rotary feed screw (auger). When the feed screw rotates an exact amount of material gets transported. Controlling the motor movement gives you exact control over the amount you want to dispense. Material that you want to dispense must be viscose enough that it does not flush through the valve by itself. The valve operates with a maximum frequency of 10.000 dots per hour. Max. viscosity 1.000.000 cps.