Butterfly valve - also called: Butterfly valve, Butterfly valve sealed, Butterfly valve, Butterfly valve. In most cases, such shut-off valves are used when: a very large diameter of the pipeline, low pressure of the medium and a reduced requirement for the tightness of the working body.

In butterfly valves of the butterfly type (butterfly valve), the locking element is a valve that has the shape of a disk and can block the passage of the working medium through the seat (annular) in the body by turning (usually 90 °) the valve around an axis that is perpendicular to the direction of flow Wednesday. In this case, the axis of the disc, rotation can be its own axis (axial butterfly valves) or they may not coincide with the axis (eccentric butterfly valves).