A butterfly valve is a flow control device that incorporates a rotational disk to control the flowing media in a process. The disk is always in the passageway, but because it is relatively thin, it offers little resistance to flow.

Butterfly valve technology has evolved dramatically over the past half century, as has its industry popularity. This popularity can be partly attributed to the quarter-turn operation, tight shutoff and its availability in a variety of materials of construction.

• Early use of butterfly valves focused on water applications, but new designs and component materials have allowed them to be utilized in growing industrial fluid applications. Presently, butterfly valves can be found in almost every chemical plant handling a variety of diverse fluids.

•Butterfly valves range in size from 1 in to more than 200 in and most have a pressure capability of 150-psi to 740-psi cold working pressure. The general temperature rating for a resilient seated valve is 25 Degrees F to 300 Degrees F and 400 Degrees F to 450 Degrees F for a high-performance butterfly valve. •The butterfly valve can be used for on-off service or modulating service. Actuation is typically achieved either manually (handle, wrench, gear operator) or through an external power source to cycle the valve automatically. •Automatic actuators include electric, pneumatic and hydraulic operators. •There are many advantages offered by butterfly valves compared to other types of valves including an inherently simple, economic design that consists of fewer parts, which makes butterfly valves easy to repair and maintain. The wafer-shaped body and relatively light weight offer a savings in the initial cost of the valve and installation costs -- in person-hours, equipment and piping support.

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