Wafer Butterfly Valve
are used for isolating and regulating flow. The closing mechanism is a disc that allows for quick shut off, much like a ball valve. Butterfly valves are light in weight so they require less support. Unlike the ball valve, the disc is always present within the flow, therefore a pressure drop is always induced during flow, regardless of valve position. The disc is typically rotated a quarter turn when the valve is fully opened, but the valve may also be opened incrementally in order to throttle flow.
Wafer type ball valves fit between two flanges, with studs passing from one flange through other. The valve is held in place and sealed with gasket by the tension of suds. These are considered low cost .
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