电液动蝶阀electrichydraulicbutterflyvalve
astm b148 c95800 butterfly valve nickel-aluminum bronze dn300
the electric pvc butterfly valve
d971x-16c对夹式电动蝶阀图片电动蝶阀(electric butterfly valve)是
31u series butterfly valve 2 – 20″, 285 psi
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