Check valves are widely used within the industry to prevent back flow and by doing so protect sensitive components such as pumps or prevent inadvertent draining of tanks. A check valve is a passive component that admits flow in one direction only. An ideal check valve will close exactly when the flow is reversed. However in reality some back flow often occurs and when the valve closes completely a pressure surge or water hammer will result. This pressure surge or water hammer will affect the piping system both through unbalanced forces and increased/decreased internal pressure. The size of pressure surge is largely dependent on the amount of back flow through the valve prior to closing. In this study, we tested noise and vibration. And we analyzed a dynamic behavior of air check valve. First the modal frequency and mode shapes are calculated. And we analyzed a transient response and a frequency response.