High Volume Low Pressure (HVLP) spray guns are painting systems that utilize a high volume of air in order to atomize paint at low pressure. The effect of this system, as compared to other types of spray guns, is that higher proportions of paint reach a target surface. This is ideal for use in painting cars and other specialized materials due to improved paint coverage and reduced material consumption. There are three major aspects to adjust when using HVLP spray guns:
The air pressure connotes to the relative strength of the air pushing out the paint at a given time. Most painting projects require air pressures that range from 18 to 25 psi. HVLP guns have a gauge where you can control the air pressure according to your desired effect. You will be able to read the current pressure from the gauge as you fine tune it. Additionally, the length of the hose that connects the air compressor to the gun may also have an effect on the amount of pressure.
You can also turn another knob found in HVLP spray guns to modify the fan pattern. By adjusting the knob, you will be able to widen or narrow down paint coverage. For large scale painting jobs, wide patterns may be suitable. On the other hand, smaller projects only require narrower patterns in order to avoid overspray conditions and premature drying of some areas.
Lastly, HVLP guns have nozzles that will allow you to stop the flow of fluids coming out of the gun. The amount of fluid volume being ejected has a direct effect on your spray pattern. The more fluid you allow to escape from the gun, the thicker the coat will be on the surface being painted. It is important to note that this nozzle can practically block the flow of paint when fully turned to one direction.