PROPORTIONAL VALVE CONTROL DEVICE

摘要

PURPOSE: A proportional valve control device is provided to prevent the mis-operation of the forcible stop of the gas supply even when any disorder is not occurred even if a proportional valve having a smaller maximum rated current value is used. CONSTITUTION: The device is composed of: an opening control unit to operate the opening of a proportional valve installed in a pipe and to control the operation current value of the proportional valve according to the operated value; and a closing piece to detect the real operation current value flowing on the proportional valve and to close the pipe if the difference between the opening corresponding to the detected operation current value and the operated opening is over a certain value.; Herein, if the operated opening is over a first certain opening or a second certain opening close to the maximum opening, the operation of the closing piece is stopped.