Many of our valves use the force of the spring to actuate itself mechanically, and thus called the "self-actuated regulating valve." Due to this design, the valve requires no external energy, such as electricity, to operate itself. They are energy-saving, eco-friendly products. Yoshitake "s valves, while they themselves may not be visible, play an indispensable part in our every life; they are used in machines and plants, buildings, public facilities, and more.