电动蝶阀-开关型或调节型
双偏心弹性金属密封蝶阀
giq气动真空蝶阀 / pneumatic vacuum butterfly valve
蜗轮蜗杆传动球墨铸铁 ggg50 dn200 pn10 翼缘双偏心
electric 4-20ma regulating type sanitary butterfly valve
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