西门子电动三通球阀,PN40 VBI61…内螺纹连接 VBI61.15-1.6 VBI61.15-2.5 VBI61.15-4 VBI61.15-6.3 VBI61.20-4 VBI61.20-6.3 VBI61.25-10 VBI61.32-16 VBI61.40-25 VBI61.50-40