Patent ID: 7374148

Claim:
A control system for a flow adjusting valve, said control system acts on a flow adjusting mechanism to change openness of said flow adjusting valve in said flow adjusting mechanism and to get an effect of flow adjusting; said control system is characterized in that: said control system for said flow adjusting valve uses rotation of a low power motor as a power force to get said openness of said flow adjusting mechanism; rotating of said motor is transmitted via a plurality of transmission gears and clutch gears to a terminal output axle, then said terminal output axle drives said flow adjusting valve to change openness of the latter; said control system for said flow adjusting valve further includes a magnet synchronically rotating with said terminal output axle and a magnetic inductive element in opposition to said magnet to count number of rotating turns of said terminal output axle to obtain different fed back signals, thus openness of said flow adjusting valve is known; at the maximum and the minimum states of openness of said flow adjusting valve, said terminal output axle is unable to further rotate, said clutch gears generate a protective getting off action to render said magnetic inductive element unable to detect said fed back signals; said maximum and minimum states of openness of said flow adjusting valve is known by rotating forwards and backwards of said motor, this is used as a reference method to have frequency signals of said control system for said flow adjusting valve set zero for correction.