Analysis of Influence of Closing Process of Ball Valve on Water Hammer Effect

Abstract

In this paper, in order to analyze the influence of water hammer effect in different closing processes of ball valve, the sliding grid of fluent software and udf technology are used to simulate the rotation process of ball valve when it is closed, and the changes of flow field and water hammer pressure during the closing process of ball valve are studied and analyzed. The results show that with the closing of the valve, the flow rate of the ball valve increases first and then decreases. When the flow rate of the ball valve reaches the maximum value, the fluid medium has the maximum impact on the valve core, and the water hammer pressure of the ball valve reaches the maximum value. The maximum water hammer pressure of ball valve gradually decreases with the increase of valve closing time, and under the same valve closing time, uniform acceleration and uniform deceleration will produce greater water hammer pressure than uniform speed.