When the speed of governor increases, then height of governor decreases but radius of rotation increases. When speed increases, centrifugal force increases that increased radius of rotation of arm and with this, sleeve moves downward - reducing the height of governor. The function of governor is to increase the supply of working fluid going to the prime-mover when the load on the prime-mover increases and to decrease the supply when the load decreases so as to keep the speed of the prime-mover almost constant at different loads. The balls and the sleeve rises when the spindle speed increases, and falls when the speed decreases.