The check valve performs the function of protecting the pump from abnormal conditions in the piping system. The pressure variation caused by water hammer can be obtained using the Joukosky equation. We reproduced the water hammer phenomenon in the constructed test equipment. The pressure rise of the water hammer phenomenon was confirmed in proportion to the pressure applied to the single disk check valve. The pressure rise of the water hammer phenomenon at an applied pressure of (3.5~10) bar was three times the applied pressure. The multi-disc check valve is closed by the weight of the main disc and the sub discs, so the bottleneck of the fluid outlets prevents water hammer. The test confirmed that when the water hammer is applied to the check valve, the pressure of the multi-disc check valve rises less than that of the single-disc check valve.