Abstract
In this paper, the water hydraulic cylinder position control system, newly developed by authors, will be discussed. First, the outline of the water hydraulic servovalve and the components for cylinder position control system, as well as the points of control method of the water hydraulic system, are introduced. Next section discuses on the basic performance of the system: a horizontal cylinder position control; synchronizing control for two horizontal cylinders; and a basic performance of synchronizing control device which moves cylinders vertically. The control performance of these water hydraulic servo system is at the same level of that of the oil hydraulic servo system. For the synchronizing control for vertical cylinders, more practical issue, such as the influence of the eccentric load, is discussed.
