An Experimental Study to Predict Dynamic Performance of Check Valve by Water Hammer

Purpose: In this study, the dynamic performance by the reproduced water hammer was compared and analyzed according to the shape of the check valve. Methods: The pressure variation caused by water hammer can be obtained using the Joukowsky equation. In actual pipe systems, water hammer occurs in long pipe of several km, but it is impossible to install long pipe in the laboratory environment due to the space constraints. Therefore, the test equipment by installation a pressure tank was developed to replace the long pipe. Results: The pressure of the water hammer phenomenon rises in proportion to the applied pressure at the check valve outlet, and the pressure rise was about three times the applied pressure. Conclusion: The main parameters affecting the water hammer were the applied pressure and the shape of check valve. It was confirmed that the effect of the applied pressure was greater than the effect of the shape of the check valve. It was verified that the multi-disc check valve performs the function of protecting the pump more than single-disc check valve from the water shock of the pipe system. The initial framework has been constructed and reported at the 2017 conference of the KSME [1].