Float chamber 1 is connected to the tank whose level is to be controlled. Inside chamber 1 is float 2 (shown by a dashline) which is attached to a lever turning about fixed axis A. Also turning about axis A is yoke 3 through which lever 4 passes. Lever 4 is connected by turning pair B to tie-rod 6. Secured on the other end of lever 4 is weight 5. Tie-rod 6 is connected by turning pair C to lever 8 which, in turn, is connected by turning pair D to link 9 and by turning pair F to intermediate link 10. Link 9 turns about fixed axis E. Intermediate link 10 links valve 7 to lever 8 a long whose axis weight 11 can be adjusted. Hand 12, indicating the level of the liquid on a scale, is attached to the shaft at axis A. If the level in the tank drops, float 2 moves downward and lever 4 turns counterclockwise about axis A. This opens valve 7 and increases the supply of liquid to the tank. The liquid flows through valve 7 in the direction of the arrows.
$3905$LHP,Rg$