Pneumatic rotary tool with airway switching structure

A pneumatic rotary tool, comprising:

• a housing being substantially cylindrical in shape and extending along a longitudinal axis, the housing defining therein an air chamber for receiving compressed air, and provided with a drive lug at one end and an air inlet at an opposite end, the air inlet communicating with the air chamber;
• an air motor disposed in the housing between the drive lug and the air chamber, the air motor having an output shaft connected to the drive lug;
• a rotatable valve rotatably disposed in the housing along the longitudinal axis between the air motor and the air chamber;
• and
• a dial ring rotatably mounted around the housing, with the longitudinal axis as a central axis, and close to the air inlet, the dial ring being coupled to the rotatable valve by a tube therebetween to enable the air motor to be switched between a forward rotation mode and a reverse rotation mode.