These Stainless Steel CommandValve butterfly valves provide a low-cost alternative to bellows sealed gate valves. Our smart butterfly valves are the perfect solution for vacuum system automation and control, as they can easily be computer controlled through their USB-mini port connector (with windows software provided) or via manual push buttons.These electric valves easily actuate from the fully-closed position to fully open. Our design allows the sealing disk to center itself when closing with even pressure around the Viton or KALREZ O-ring seal. This design also helps to lower the amount of scuffing or rolling of the O-ring. Small footprint and the shortest possible gas path make our CommandValve the preferred choice for many applications.