To suppress flow rate fluctuation caused by a characteristic of a valve and to improve control accuracy by constituting a device so as to be provided with a storage means storing operating characteristic data of the valve, to correct driving amount of a valve element that an instruction means instructs by operating characteristic data and to make a driving means to output driving amount.

When it is judged that instructed opening is inputted after a CPU 6 performs an A/D conversion for an instruction signal from an instruction means in an A/D conversion part 8, the CPU 6 calculates a rotation distance of valve element required for changing opening of a valve 4 to instructed opening from the present opening of the valve element, from flow rate characteristic data corresponding to opening for every resolution of the valve 4 stored in an EEPROM 10. From determined codes of the rotation distance of the valve element, whether the valve 4 should be moved in an open direction or moved in a close direction judged. In the case of the close direction, the rotation distance is corrected by valve element rotation direction opening deviation data stored in the EEPROM 10, the rotation distance is outputted to a motor driving device 5 and value opening is controlled.