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Eccentric Butterfly Valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is comparable to that of a ball valve, that permits for fast shut off. Eccentric Butterfly Valves are typically favored as a result of they're lower in price to alternative valve styles additionally as being lighter in weight, that means less support is needed. The disc is positioned within the center of the pipe, passing through the disc is a rod connected to an mechanism on the surface of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Not like a ball valve, the disc is often present inside the flow, thus a pressure drop is often evoked within the flow, in spite of valve position.