Abstract
The reheat-stop-valve mechanism is a vital component which controls high temperature and high pressure steam in a steam turbine. But there is a great probability of catastrophic failures such as mechanical jamming or insufficiency in the mechanisms when closing the valve in working condition. This paper analyzes the leading influencing factors causing variant dynamic response, even failures in the mechanisms based on failure analysis. Then a method of performance analysis of the mechanism with clearance joints is represented involving all the leading factors. These factors are the dimensional errors, assembly deformation caused by interference coupling, misalignment and eccentricity in bearings and thermal deformation of high temperature steam. Our results demonstrate that the mechanism performance is exceedingly sensitive to the uncertain factors: dimensional errors, assembly deformation and misalignment in working condition. An infinitesimal variation range of 0.025 mm may lead to great uncertainty of dynamic performance or even failures when closing the valve. However, eccentricity at equivalent level contributes little effect. Recommendations based on this study have been adopted in engineering, which are proved to be effective.
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