Abstract:The causes of the problems of reheater spraying water regulating valve are analyzed, such as the poor regulation performance, serious cavitation erosion in small flow, poor sealability, and inaccuracy of locator caused by valve's great vibration. The individualized solutions are designed. With the internals remoulded and the performance curve of regulating valves optimized, the regulation accuracy improves effectively, the leakage of spraying water is eliminated and the work of equipment maintenance is reduced sharply. The referential experience can be provided for other thermal power plants in solving similar problems.