There are various structural forms of spray guns used in air spraying, with the most commonly used being suction nozzles and flat nozzles, as well as various specifications of spray guns with different classification structures such as pressure down, electric, and low fog spray guns. Currently, suction nozzles are commonly used, with models PQ-1 (also known as nozzle type) and PQ-2 (also known as flat nozzle type).

The correct method to use the spray gun: When using the spray gun, press the trigger with your hand to open the channel for compressed air first, and then the channel for the paint nozzle. Compressed air flows from the pipeline to the nozzle, and at this time, it is encountering paint flowing out of the paint nozzle. The paint is then blown away and sprayed onto the workpiece. When the trigger is released, the small hole of the paint nozzle is tightly closed by the ejector pin, and the compressed air channel is also blocked.

The amount of paint sprayed can generally be controlled by the extent to which the ejector pin extends, and the extent to which the ejector pin extends can be adjusted using a limit screw. To significantly change the amount of paint sprayed, it is necessary to replace nozzles with different diameters. By utilizing the auxiliary air channels on the nozzle and different positions of the nozzle, various shapes of paint flow can be adjusted. The maintenance of the spray gun mainly involves cleaning. After the spraying work is completed, the spray gun must be cleaned thoroughly and no residual paint is allowed inside the spray gun.

When cleaning the spray gun, a portion of the diluent can be loaded into the paint storage tank, and then the paint outlet can be blocked with your fingers. By pulling the trigger and utilizing the strong flushing effect of the diluent, the residual paint in the spray gun can be cleaned thoroughly. In addition to cleaning the area after each construction, regular and comprehensive disassembly and assembly of the spray gun should also be carried out. The spray gun is about to be disassembled into parts, soaked in diluent, and then cleaned one by one. During the entire process of disassembling and assembling the spray gun, special tools should be used to carefully operate and not damage various parts, such as the ejector pin, sealing gasket, etc. Only use a brush to clean the spray gun.

The cleaned parts should be wiped with a clean and soft cotton cloth. After the air outlet or paint outlet is blocked, it should be carefully wiped with solvent and not poked with metal wire to avoid damaging the small hole and affecting the normal use of the spray gun. After cleaning the spray gun, it should be placed in a safe and dry place.