Improved mechanical throttle valve body

The utility model discloses an improved mechanical throttle valve body, which includes a throttle valve main body (6) and a throttle valve spindle (28), wherein a throttle valve peritreme (7) is installed on the throttle valve spindle (28); a position sensor (8) is arranged at one end of the throttle valve spindle (28), and a torsion spring (9) and a rotary rack (10) are installed at the other end of the throttle valve spindle (28); an idle valve seat (11) is also arranged on the throttle valve main body (6); a stepping motor (12) is fixed on the idle valve seat (11); and a water circulation passage (13) is also arranged on the throttle valve main body (6). The improved mechanical throttle valve body has the benefits that the water circulation passage (13) is arranged to solve the problem of icing of an airflow passage, and the water circulation passage (13) is formed through a die, thereby saving the cost; an axial clearance control mechanism is adopted to keep the excellent position return capability of the