Abstract
The test method for the flow characteristics of a pneumatic solenoid valve is specified in ISO 6355. In this standard, the fl ow characteristics are shown by the sonic conductance and the critical pressure ratio, and these are calculated from the fl ow rate, the pressure and the temperature of the air that passes the solenoid valve. When the flow characteristics of a large solenoid valve are measured by this method, a large compressor and a large flow meter are required. Therefore the power consumption and the generating noise become very large. In this study, a test method using the small and low noise test equipment is developed. In this method, at first the tank connecting to the solenoid valve is evacuated, and then the air is charged in the tank through the solenoid valve from the atmosphere. By using the pressure and temperature in this tank, the sonic conductance and the critical pressure ratio are evaluated.
