Pressure versus Flow Characteristics of a Diaphragm Type Pneumatic Pressure Control Proportional Valve

This paper describes the experiments and the theoretical analyses about the pressure versus flow characteristics of a pressure control proportional valve with diaphragms. The effects of the valve springs, effective area of the diaphragms and flow force on the characteristics are analyzed theoretically and experimentally. Fairly good agreement between experimental and theoretical results are obtained. The experimental results showed that the shape of the diaphragm has some effect on the relation between effective area versus valve displacement, and then on the pressure versus flow characteristics. Changing the shape of the diaphragm, better characteristics are obtained experimentally.