Piston 1 of the servomotor reciprocates in cylinder 6. Connecting rod 2 is connected by turning pairs B and C to piston 1 and to crank 7 which turns about fixed axis A. Motion of piston 1 turns crank 7 and shaft a, rigidly secured to the crank. Mounted outside on shaft a is flange 3 to which link 4 is secured. The fork-shaped end of link 4 is hinged to tie-rod 5 which is connected to the stem of the valve being controlled.
$3952$LHP,Dr$