Nozzle of a spray gun and method for spraying from spray gun

A method of spraying from a nozzle of a spray gun, comprising:

• a step of forming rooms:
• providing an outer part connected to the spray gun, the outer part having a first nozzle which is a cone-shaped nozzle, the outer part having a neck portion which includes a neck hole and multiple paths which are located around the neck hole, the neck portion dividing an inner space of the outer part into a first room and a second room;
• a step of installing a swing member:
• extending a tube through the neck hole, a swing member connected to a rear end of the tube, an inner part connected to a front end of the tube, the swing member including multiple wings extending from an outer surface thereof, the swing member including a cone-shaped way defined therethrough, a Venturi-tube extending through a front outlet of the spray gun, the cone-shaped way and the tube, and
• a step of introducing high pressure liquid:
• providing a head part formed to a front end of a barrel of the spray gun, the head part including multiple bores which communicate with the front outlet so as to introduce high pressure liquid into the first room via the bores, and to introduce high pressure liquid into the second room via the paths, the high pressure liquid introduced in the first room driving the swing member to swing, the tube and the inner part swinging with the swing member, the high pressure liquid introduced in the second room via the paths spraying from the first nozzle.