止回阀是管路系统的重要组成之一,其主要作用是防止流体倒流、泵及其驱动电机反转,以及防止容器内流体的泄放。理论上讲,止回阀的结构是简单的,它包括一个或几个关闭件,其关闭件的动作主要是由流体控制的。过去最普通的止回阀是旋启式止回阀。在这类止回阀中,当阀门关闭时,流体的速度方向立即改变。随着反向速度的减小,压力迅速升高,使阀门加速关闭,最后阀瓣撞击阀座产生更高的压力。近年来,止回阀冲击问题的重要性越来越 The check valve is one of the important components of the piping system. Its main function is to prevent backflow of the fluid, reverse rotation of the pump and its drive motor, and to prevent the release of fluid in the container. In theory, the structure of the check valve is simple and includes one or more shut-off members whose action is primarily fluid-controlled. The most common check valve in the past was a swing check valve. In this type of check valve, when the valve is closed, the direction of the velocity of the fluid changes immediately. As the reverse speed decreases, the pressure rises rapidly, causing the valve to close quickly, eventually causing the valve disc to impact the valve seat to create a higher pressure. In recent years, the importance of check valve impact problems has become more and more significant