A piezoelectric-based hydraulic actuator is a type of piston-cylinder device which is operated by internal flow energy. Recently, an artificial muscle and a micro actuator have been developed using a new smart material and internal flow control. Thus, the actuating velocity of the fabricated integrated hybrid system was investigated using the pumping frequency and load weight. The actuating velocity was then calculated using a developed program, and the numerical result was compared with the experimental result to validate the numerical program. Also, the internal flow rate was measured to analyze the pump efficiency experimentally. The flow rate inside the integrated hybrid actuator calculated using a CFD program for various pumping frequencies was then compared with the experimental results. The maximum outlet velocity was obtained at the pumping frequency of 35 Hz and the velocity decreased from that point due to flow loss.