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乌溪江水电厂湖南镇电站4号机主阀原为横轴摆动双平板式蝶阀,由于年久老化,问题较多。主要为全开全关位置接点经常故障;蝶阀常有冲闭现象;旁通阀采用液压操作,用油量大;启闭操作时需要退投充气围带密封,增加了操作风险;在厂用电消失时需要备用油源等问题。电站主阀于2012年11月改造为希斯威HD741X—VK型蓄能罐式蝶阀。
Wu Xi River Hydropower Station Hunan Power Station No. 4 machine main valve was horizontal axis swing double flat butterfly valve, due to aging, the problem more. Mainly for the full-closed position contacts often fail; butterfly valve often closed phenomenon; bypass valve hydraulic operation, large amount of oil; opening and closing operation need to retreat inflatable enclosure with a seal, an increase of operational risk; Electricity disappears when the need for spare oil source and other issues. The main valve of the power station was transformed into Heathrow HD741X-VK tank-type butterfly valve in November 2012.