高品质的手动蝶阀 dn500 - buy butterfly valve,manual butterfly
high performance lug eccentric butterfly valve
美国also艾索进口气动蝶阀butterflyvalve
butterfly valve
蝶阀(英文:butterfly valve)是指关闭件(阀瓣或蝶板)为圆盘,围绕阀轴
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