Abstract: Aimed at the problem of the lower pulse width modulating frequency of the present high-speed on-off valves, an attempt at developing a new kind of electro-hydraulic high-speed on-off valve driven by piezoelectric components is done. And the valve’s dynamic and static performances are studied. The prototype of the new valve is the kind of 2-position and 3-way poppet-type digital valve which can control flow rate of 8 L/min at 10 Mpa pressure, whose opening time is about 1.2 ms and whose closing time is approximately 1.7 ms. The driving circuit of this valve and its working principle are also analyzed, and the high-powerful and speedy technique of the valve is researched by the transient state analyzing theory of circuit.

Key words: Dynamic performances, Speedy drive, High-speed on-off valve, PZT components, Static performances