Abstract:It is commonly used to bleed air in aero-engines system with the asymmetric cylinder of the three-way pneumatic valve control cylinder which is composed of a fixed orifice, a variable orifice with different nozzle-flapper type and a vessel. Based on the theory of the valve control cylinder, we have built up the mathematical model of the pneumatic three-way asymmetric cylinder differential system, and got the influence rule of air source, control valve and the cylinder's structure parameters for the cylinder's static and dynamic characteristics. The cylinder's response speed can be improved by measures for increasing air filling rate and reducing air requirements, such as increasing fixed orifice diameter, reducing the piston effective action area, increasing air source pressure and so on. The theoretical analysis is consistent with experimental results.