Research on an Asymmetric Highspeed Pneumatic Servo Valve

Abstract

This paper describes an asymmetric electro-pneumatic servo valve and hardware compensation approaches for high speed control of rise time and step-down time. The flow capacity of the downstream control orifice of asymmetric valve is about twice of that of the symmetric valve at the same spool displacement. Experimental results show that the bandwidth is 200Hz and rise time is less than 1 ms. The flow capacity of the downstream control orifice of asymmetric valve (337NL/min) is about twice of that of the symmetric valve (171NL/min).