1" Pickering Governor

1" Pickering Governor

Three balls are employed, each fixed in the middle of a separate plate spring. The lower ends of these springs are attached to a collar formed on the driving pinion, which runs free on a fixed central tubular column. The upper ends of the springs are secured to a cap at the top of the column, the cap being free to revolve and to rise and fall, so that as the balls diverge under the centrifugal force the top cap is drawn down, carrying with it a central shaft which is connected with a throttle valve contained in the lower casting. A helical spring is arranged to act upon an arm connected with the central spindle, and by means of a worm and worm wheel can be adjusted so as to alter the speed while running. The example shown is for a steam pipe 1 in. diam., and should make 300 rev. per min.