Determination of Characteristics for Electrically Modulated Pneumatic Control Valves using Isothermal Chambers

In the present paper, an automatic test bench is developed for determining the main characteristics of electrically modulated pneumatic control valves using isothermal chambers. In particular, the pressure-flow rate characteristics can be obtained by simply measuring the pressure response inside the isothermal chamber during charge and discharge of air to the chamber. The proposed test bench has a shorter measurement time of only seconds and a lower air consumption as compared to the improved conventional method. Furthermore, the frequency dynamic characteristics with volume load can be measured more accurately owing to the use of an isothermal chamber as a load chamber. The high measurement efficiency and energy savings of the developed test bench are demonstrated herein.