Pneumatic three-way shunting regulating valve

The utility model discloses a pneumatic three-way shunt regulating valve which comprises a valve body, a valve cover and a valve rod, the valve cover is installed on the upper portion of the valve body, a pneumatic actuator is installed above the valve cover, the valve rod penetrates through the valve cover, the outer end of the valve rod is in linkage connection with the pneumatic actuator, and two valve elements are installed at the inner end of the valve rod. An inlet flow channel, a first outlet flow channel and a second outlet flow channel are arranged in the valve body, and a valve seat matched with the corresponding valve element is arranged between the inlet flow channel and the first outlet flow channel and a valve seat matched with the corresponding valve element is arranged between the inlet flow channel and the second outlet flow channel; a polished rod portion and a screw portion are integrally arranged at the inner end of the valve rod, a limiting step is formed at the position, corresponding to