Transient pressure response of pneumatic nozzle flapper.

Abstract

A pneumatic nozzle flapper is widely used in pneumatic control systems and is one of the important converting elements. Its transient pressure response has been investigated in several papers, but the case with small time constant has not been reported so far. This article shows experimentally that the time constant of the pneumatic nozzle flapper varies with the direction of pressure step and the position of load capacitor. In the case of steady flow through the load capacitor, the time constant is larger in general than that of the side-capacitor, and the time constant of negative pressure response is smaller than that of the positive pressure response. These differences are considered to be caused by the heat conduction between air and the capacitor wall. (from English abstract)