Research on Fatigue Failure of Damping Valve Based on Water Hammer Pressure

Regarding to the phenomenon that the throttle valve plate was impacted and failed during the test of the damping valve, the reason was analyzed through the water hammer theory, and the physical model of damping valve was built. On this basis, the equation of valve opening varying with time was derived, and the mathematical model of damping valve non-transient opening and closing water hammer was created through feature line method. The influence of the structural parameters of the orifice at the throttle plate on the transient impact on the damper valve was analyzed by programming, and it was concluded that increasing the area of the orifice can reduce the impact of the valve. The conclusions can be used as design reference for damping valves, so as to avoid the recurrence of valve fracture.