Numerical Research on Shock Resistance Safety Analysis of Ship Power Plant Valve

In order to increase the operation safety of ship nuclear power platform. A typical butterfly valve with nuclear safety class 2 of ship power plant is studied in this paper. Numerical analysis on shock resistance safety of butterfly valve is conducted by three-dimensional finite element method. Firstly, the load type under working condition and the stress evaluation criteria of valve safety analysis are determined based on national standards and ASME standards. Secondly, the finite element model of butterfly valve is constructed and the equivalent stress distribution of butterfly valve is obtained under static loads and constraint conditions. Moreover, the butterfly valve natural frequencies and vibration shapes are obtained by modal analysis under inspection working condition. Furthermore, the butterfly valve stress distributions on three coordinate directions are analyzed by shock response spectrum analysis according to the modal analysis results. Lastly, the total stress distribution of butterfly valve is obtained by superposition procedure. And the butterfly valve structure shock resistance safety is checked based on the stress evaluation criteria.