Butterfly valve, also called as flap valve is a valve that has simple structure, used for media having low pressure. The closure member of butterfly valve is a disc which can swing along with valve shaft. Operation is similar to that of a ball valve, which allows for quick shut off. A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. There are different kinds of butterfly valves, adapted for different pressures and different usage.
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