In this paper, we report on the hydraulic characteristics of a particle-excitation control valve, which was originally developed for flow rate control in pneumatic actuators. The orifices are opened and closed with particles excited by the vibration of the orifice plate and the fluid force. This results in a more simple and compact structure, and higher flow rate-to-weight ratio than in conventional pneumatic valves. Because the traditional hydraulic valves are bulky and heavy, the purpose of this study is the development of a small and lightweight hydraulic valve by applying the working principle of the particle-excitation valve to hydraulics. We have focused on two characteristics affected by changing the working fluid from air to oil. One is the vibration of the orifice plate and the other is the movement of the particles. As a result, it is found that the inertia of the working fluid reduces the vibrational velocity of the orifice plate by 24%, whereas the viscosity of the working fluid raises the required operating voltage of the valve by 167% because of its influence on the movement of particles. In addition, when silicone oils are used as the working fluid, with kinematic viscosity values of 1 mm²/s, 2 mm²/s, and 3 mm²/s, the maximum volumetric flow rates of the prototype valve are 891 ml/min, 887 ml/min, and 838 ml/min, respectively. These experimental results demonstrate the potential of the proposed valve for hydraulics.