Flow regulating valve

A flow regulating valve, comprising:

• a valve seat and a shell connected to the valve seat, wherein a motor is provided in the shell, and the motor is connected to a screw rod via an output shaft of the motor;
• the screw rod is connected with a nut in a thread cooperation manner;
• and the nut is connected with a valve rod, and the valve rod is movable in an axial direction to regulate an opening degree of a valve port on the valve seat;
• and wherein the valve rod is provided therein with a mounting groove, and the whole of the nut or a lower portion of the nut is in clearance fit with the mounting groove in a radial direction;
• and an internal wall of the mounting groove is provided with an annular position limiting groove, and a position limiting component that limits an axial position of the nut and in clearance fit with an exterior portion of the nut is provided in the annular position limiting groove;
• and
• one of a bottom wall of the mounting groove and a bottom wall of the nut is provided with a circumferential position limiting groove, the other one is provided with a position limiting projection, and the position limiting projection is provided in the circumferential position limiting groove.