Water conservancy project generally has the characteristics of long running time and under high pressure and high flow rate and large flow, the director of the valve outlet exist cavitations and other issues, and the body vibration is more serious, the situation on the valve work. This paper based on the theory of fluid and the design of the piston flow adjusting valve, according to different work state of the fluid spray out to small columns or volute fan leaf form, at the exit to the intensity of the axial contraction and cancel each other out fluid impact, thus well control fluid state and eliminate the damage of the body fluid. The type of valve has been applied to the actual water conservancy project. Plunger Valve using SolidWorks modeling and static analysis, safety factor checking by means of stimulation, using fluid analysis software FLUENT was fluid simulation was used to simulate the fluid solid coupled analysis. So that the type of valve to meet the requirements of the work.