... fly nut翼螺帽 fly valve蝶形阀 flyer frame粗纺机 ...
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Butter-fly valve 蝶
butter fly valve 蝴蝶阀
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The unique design of the closed post-valve to prevent flies fly in, cut off the outside air;
独特的后止回阀封闭设计,防止飞虫飞入,隔绝外界气流;
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