Simulation of Piezoelectric high-speed digital valves

As hydraulic transmission and control technology develops, the digital valve is becoming popular, and it has the potential to replace servo or proportional valves in industrial appli-cations for its excellent performance. At present the digital valve can not obtain a high response, high pressure and high flow rate together, which limits its application fields. An innovative idea of a piezoelectric digital valve is outlined to improve the performance of the digital valve. Two piezoelectric stacks are used to open and close the poppet valve. The characteristic of quick-response and high force of the piezoelectric stack is used to kick off the poppet; furthermore the micro displacement of the piezoelectric stack is avoided successfully. Temperature compensation of the piezoelectric actuator is consid-ered in the valve. The structure of the digital valve is discussed, and its mathematical model is built. Simulation results show that the piezoelectric digital valve can get a frequency of 250 Hz, flow rate of 10L/Min, and pressure of 200 bar simultaneously.