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词汇	butterfly valve
释义	butterfly valven.（名词）top: open valvebottom: closed valvePrecision Graphics A disk turning on a diametrical axis inside a pipe, used as a throttle valve or damper.节流阀，减压阀：管道内沿直径中心轴线上的圆片状旋钮，用作节流阀门或阀门 A valve composed of two semicircular plates hinged on a common spindle, used to permit flow in one direction only.蝶形阀：由附在一个共用轴上的两个半圆片组成的阀门，用于限制向一个方向的流动
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