The problem of failing to close to zero of the primary automatic main steam valve in the 50 MW steam turbine at the West Area of Handan Steel is introduced. Through carefully analysis of the causes and overhaul of the automatic main valve, the problem was successfully resolved.%介绍了邯钢西区50 MW汽轮机一次自动主汽门关闭不到零位的问题，通过原因分析，对自动主汽门进行解体检修，成功解决了该问题。
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