... shielding seal 屏蔽密封 shut-off disc 截流盘 single piece 整块 ...
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shut-off disc
关闭阀瓣
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Butterfly valve is closed parts (valve flap or disc for disc), around the valve axis of rotation to achieve the open and close a valve, in the pipeline mainly as shut off and throttling effect.
蝶阀是指关闭件(阀瓣或蝶板)为圆盘，围绕阀轴旋转来达到开启与关闭的一种阀，在管道上主要起切断和节流作用。
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