The Dynamics of a System of Nonbleed Type Pneumatic Pilot Valve and Load Chamber with a Nozzle Flapper Input

Abstract

This paper deals with the dynamics of a system of a nonbleed type pneumatic pilot valve and load chamber with a nozzle flapper input. This system is seen in many pneumatic controls and is most important in the discussion of their dynamics.
In the mathematical analysis of this paper, a linearized model is obtained, taking into account the air temperature changes in both the input and output chambers, and the pressure changes due to diaphragm displacement.
In the experiments several transient response tests including a nozzle flapper step input and a flow rate change, have been conducted, and a good agreement with the analysis has been shown.