Feed-water valves (FWVs) are used to regulate the flow rate of water entering steam generators, which are very important devices in nuclear power plants. Due to the working environment of relatively high pressure and temperature, there is strength failure problem of valve body in some cases. Based on the thermo-fluid-solid coupling model, the valve body stress of the feed-water valve in the opening process is investigated. The flow field characteristics inside the valve and temperature change of the valve body with time are studied. The stress analysis of the valve body is carried out considering mechanical stress and thermal stress comprehensively. The results show that the area with relatively high-velocity area moves gradually from the bottom of the cross section to the top of the cross section with the increase of the opening degree. The whole valve body reaches the same temperature of 250 ^°C at the time of 1894 s. The maximum stress of the valve body meets the design requirements by stress assessment. This work can be referred for the design of FWVs and other similar valves.

给水阀 (FWV) 用于调节进入蒸汽发生器的水流量，蒸汽发生器是核电站中非常重要的设备。由于压力和温度较高的工作环境，在某些情况下阀体存在强度失效问题。基于热-流-固耦合模型，研究了给水阀开启过程中的阀体应力。研究了阀内流场特性和阀体温度随时间的变化。综合考虑机械应力和热应力对阀体进行应力分析。结果表明，随着开度的增加，速度相对较快的区域从截面底部逐渐向截面顶部移动。 ^° C 在 1894 年代。经应力评估，阀体最大应力满足设计要求。这项工作可以参考 FWV 和其他类似阀门的设计。