2D PNEUMATIC DIGITAL SERVO VALVE

摘要

The digital servo valve is composed of 2-stage pneumatic servo valve developed with rotary and linear motions of a single spool, and stepper motor under continual control. To sustain the stability of the 2-stage pneumatic servo valve, an air damper is incorporated into the valve which is intended to increase both the stiffness of "pneumatic spring" and the damping ratio. The height of the circular clearance has a crucial effect on the dynamic characteristics of the valve. In this paper, the model of the pneumatic digital servo valve is established and the static positioning accuracy of the spool and the dynamic response are investigated.