Abstract

Oil Hydraulic systems are employed in a wide range of engineering fields because of their rapid response and high power density. However, increasing public awareness of environmental issues call for environmentally friendly pressure medium like water to prevent environmental damage caused by potentially harmful material leakage from oil hydraulic system.In this study, a water hydraulic high speed solenoid valve with two stage mechanism and no inner leakage is developed. The particular feature of this valve is the utilization of the leakage from the clearance between main poppet and sleeve as inner pilot flow. The experimental results using the prototype valve show excellent response characteristics and that proposed valve is valid for the control of water hydraulic systems. It is also discussed to improve the performance of this valve by the alteration of the design parameters.

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