A Butterfly Valve （蝶阀）is from a family of valves called quarter turn valves. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve.

Globe Valve, Solenoid Valve, Ball Valve, Check Valve, Plug Valve
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