Nozzle of spray gun

A nozzle of a spray gun, comprising:

• an air cap having a central path, multiple sub-paths and multiple air paths, the central path being a circular hole and defined centrally through the air cap, the air paths located around the central path, two protrusions extending from a front face of the air cap and each having the air paths defined therethrough;
• a board located on a rear face of the air cap and having multiple apertures defined therethrough;
• a cover threadedly adapted to be connected to a front end of a spray gun to position the air cap and the board;
• a nozzle adapted to be located at the front end of the spay gun and having a paint path and a probe which extends through the board, the central path of the air cap and the cover, and
• the central path of the air cap having a first inner periphery and a second inner periphery which is larger than the first inner periphery, the first inner periphery located at the front end of the air cap, both of the first and second inner peripheries of the central path being a circular hole, two guide faces each being a tapered face which is connected between the first and second inner peripheries of the central path of the air cap, the two guide faces located symmetrically relative to the central path, two air holes respectively defined between the two guide faces and the nozzle.