The authors discuss electrical circuits they have developed for the purpose of energizing the solenoid valve. These circuits are named the dummy coil method, where energy stored in a dummy coil in the form of a magnetic field is transferred to the energizing solenoid, and the pre-energize method, where the solenoid is electrically energized in advance by taking advantages of the solenoid's attraction force characteristics. Experimental results have shown that the pre-energize method is highly effective in speeding up the operation of solenoid valves. These experimental results are discussed along with results of calculation that have been conducted using a mathematical model developed by the authors.
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