Control valve driving mechanism

The invention discloses a control valve driving mechanism. Due to the adoption of the control valve drive mechanism, the frictional resistance between a rod member and a piston is decreased along with the shacking of the rod member. Therefore, the long-term operation is smoothly ensured. A leveling valve V comprises a housing (30), a valve column (32) arranged inside the housing (30) and a piston (31) in linkage with the valve column (32). By means of the movement of the valve column (32), the leveling valve V is switched between an air supply position and an air drainage position, wherein the gas supply port (30b) and the gas outlet (30a) of the leveling valve V are communicated with each other. The upper end face of the piston (31) is equipped with a concave part (31a). The leveling valve V driving mechanism is provided with a rod member (40) and a working pin (44). The base end of the lever member (40) is supported on the housing (30) in a freely rotating manner so as to bear the load of a machine and a pl