Abstract Based on Euler-Lagrange method and Finnie erosion model, the gas-solid flow in governing valve was numerically simulated by computational fluid dynamics (CFD) software in this paper. The discrete phase model (DPM) was used to simulate the particle flow, and the Eulerian conservation equation was used to solve the continuous phase. The shear stress transport (SST) turbulence mode was chosen to estimate the turbulence viscosity. Results show that the serious erosion area is found mainly on the valve chest bottom and throat under the large and medium lift conditions, but on the valve diffuser under the small lift condition. With the decrease of valve opening, the erosion rate density increases. The main factor affecting solid particle erosion (SPE) is different in the course of valve opening. The erosion rate density reaches the maximum in the particle diameter range of 40–60 μm.