汽轮机中压调节阀阀座螺钉断裂失效分析及改进

Analysis and Improvement of Bolts Broken Used for Steam Turbine IP Control Valve Seat

文章为解决部分机组大修时发现的调节阀内六角螺钉断裂的问题,进行了包括理化试验、金相检查、结构分析、装配检查等多方面的原因分析,并针对分析原因,对螺钉结构进行了优化,对安装要领进行了完善,有效减少了类似情况的发生。

In order to resolve the problem of bolts broken used in the IP control valve occurred during the overhaul of some units,some tests including the mechanical chemical examination, metallographic examination, structure analyzing and installation checking etc. were done to analyze causes based on the result, the paper talked about the improving measure on bolts structure and key points of installation, which obviously decreased rates of defects occurring.