Abstract: Based on the mechanism of twice wedge rolling for valves, changes in stress and strain of a 21-4N valve at the center with forming angle were investigated using the finite element software DEFORM-3D. The effect of forming angle on the central quality of the rolled piece was analyzed. It is found that a larger forming angle can lead to a more reasonable distribution of both stress and strain in the center of the rolled piece, which is positive to prevent central cavities. Laboratory experiments show the same result.