retz(法兰,对夹)气动硬密封蝶阀采用三偏心多层次金属
蝶阀(英文:butterfly valve)是指关闭件(阀瓣或蝶板)为圆盘,围绕阀轴
lever butterfly valve / plastic dn 50 – 150 3700 手柄
d371f4-16c turbo butterfly valve
rubber butterfly valve / wafer – 20″, 150 psi 20
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