Pneumatic closures are used in an automated process as closures in the transport of various powdery and granular materials. These closures are simply installed with a flange connection. The shutter butterfly is centrally mounted with protective rings so that they can also be used in a pressurized system. In the closed position, the butterfly is upright in the direction of flow, and the opening is performed by the force of the pneumatic cylinder on the lever, and then the position of the butterfly turns by 90°. These closures can be coated with rubber or made of prochrome if desired.