AN EXPERIMENTAL STUDY ON COMPARISON BETWEEN TWO METHODS (STEADY FLOW METHOD & DISCHARGING METHOD) OF TESTING EFFECTIVE AREA OF SOLENOID VALVE

This paper describes an experimental study to compare a method of testing the effective area of solenoid valve in a flow discharging from a tank, (JIS), with that in a steady flow, (ISO DRAFT). It became clear:(1) In the discharging method, the effective areas agreed with those in the ISO method, within 5% deviation, including expected error and the effect of heat transfer from the tank(2) The discharging method could be used as equivalent to the ISO method for practical use(3) A change of state in the tank could be approximated as a polytropic change with a constant polytropic index(4) Mass flow rate from the tank was smaller than that calculated from the above approximation(5) The reason was supposed to be due to a temperature distribution developved inside the tank, and the presumption was experimentally confirmed.