The experimental results showed that the failure mode of the BE was a combination of flow-accelerated corrosion (FAC) and cavitation erosion. The FAC characteristic 鈥渙range peel鈥?appearance was observed on the inner surface of the BE. Significant wall thinning occurred due to formation of an unprotective oxide on the metal. Simulation results showed that it is not the Venturi-like shape inside the valve but the misalignment between the reducer and the BE in the valve that caused the cavitation erosion. Moreover, cavitation enhanced the turbulence intensity and eventually increased the local FAC rate.