| 摘要 |
PROBLEM TO BE SOLVED: To resolve problems of compressed air wastefully discharged when no drain water is accumulated since a drain discharging valve such as a solenoid valve is opened at a certain cycle, a drain sensor sending no information of an existence of drain water even when it is required when the drain sensor for confirming the existence of the drain water is installed in a position where sealed compressed air is accumulated in a state covered by the drain water, and a pressure equalizer allowing removal of the sealed compressed air but is a hindrance. SOLUTION: In the automatic drain discharging method, when the compressed air 210, the drain water 220, or the sealed compressed air 230 in a state covered by the drain water 220 is accumulated right in front of the drain discharging valve 20 for discharging the drain water 220 produced by condensation of the compressed air 210, the drain discharging valve 20 is constantly opened for a certain very short time at a certain cycle to discharge the sealed compressed air 230.
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