Abstract
There is a check valve which is widely used as one of the directional control valve. The valve is simple structures that push the valve body by the spring. But the vibration may cause the internal state of flow and channel shape and the valve body. It is important to assess the mechanism of this phenomenon and valve behavior in terms of longevity and reliability of fluid machinery. Therefore, in this research, we reveal the internal flow condition and visualization system that the model's valve.
