The butterfly shutter “SF” it is used for the extraction of both powder and granular materials. The machine is composed of a carbon steel structure with connection flanges and a tilting disk complete with a watertight seal. The opening and closing of the tilting disc are determined by a handling system with rotary pneumatic actuators or an electric motor. The sensors for detecting the position of the disc can be of a mechanical or inductive type. Available in version compliant with ATEX and FDA standards.