When designing a dust collection system for your food processing facility, you must carefully consider the composition of your material before selecting the right type of rotary valve. If you are processing light, dry, free-flowing foodstuffs such as grains, flour, or even mini-marshmallows, a rotary valve is likely your best bet. A rotary valve can be used to control the feed or discharge of free-flowing bulk food material without impacting the negative or positive air pressure in the system. Its design is similar to a revolving door you might use to enter a building; the material must pass through a rotating chamber in order to reach the opening on the other side. The turning vanes of the rotary valve are tightly spaced to the valve walls, creating an airlock. Because of their relatively large size and soft, non-abrasive composition, marshmallows will not get caught in the vane or wear out the rotary valve mechanism. When processing foods like these, a rotary valve will provide durable, reliable dry material handling over a long-term operational life.