Butterfly valves is a fast opening valve that is a metal disk or leaves the pivotal axis perpendicular with the direction of flow of the pipeline, when the rotation of the shaft, seals the seats in the valve body. They are usually used as a control valve to control the flow. Butterfly valve control traffic, gas or liquid form disk, a radial shaft in rotation in the pipeline or by the two semi-circular plate hinge on a common axis and allowed to flow in only one direction. These provide a valve stem the Rotary Club of movement 90 degrees or less, in a compact design. Different ball valves, butterfly valves do not have any pockets, fluid may become trapped, the valve closed.

Butterfly valve, in the style of several agencies and sealed types. Flange-or-style, can be held between the flange of any kind. Wafer valve installed by the two flange nuts and bolts or nails, and the film-valve inserted a metal valve installed in the bolt hole and two flange valve is installed with a separate set for each bolt flange. If wafer style, is to use, to avoid placing it between either slip or threaded flange type. Some wafer style will not form a proper seal. Wafer style, is more common and cheaper, than the film's style.

Butterfly valve offers many advantages when used for the proper application. They can be used in a wide variety of chemical services, they may be small in size, allowing the use of the place, space is limited, they allow a high coefficient of flow. Conversely, the butterfly valve design shortcomings is not easy to create clean, it should avoid the circumstances, the requirements of infertility, medical or food processing applications. In addition, some style, may encounter difficulties in dispensing the mud.

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