dn50闸阀规格型号,dn65闸阀规格型号

z40h-150lb-dn32,z40h-150lb-dn40,z40h-150lb-dn50,美标闸阀
闸阀规格型号尺寸
德标f4软密封闸阀供应dn50-dn1200水电站专用软密封闸阀
春江阀门活塞阀dn50-dn300活塞阀生产厂家
z41h-16c明杆硬密封手动法兰闸阀dn50-dn600