3-14. Air Transformer. Supply spray guns with clean, moisture-free, regulated air by installing an air
transformer (Figure 3-46) in the main air-line. The air transformer separates oil, dirt, and water from the
compressed air before it enters a spray gun; reduces the pressure on the main air-line to the desired
working pressure; and provides convenient hose connections for one or more spray guns. The
transformer has gauges which indicate the working pressures at the outlets.
Whenever an air transformer has only one working-pressure regulator, all attached spray guns will have
the same working pressure. However, if the transformer has two working-pressure regulators, as shown
in Figure 3-46, the attached spray guns are regulated by different working pressures. Use an air
transformer in all finishing paint shops where a supply of clean, moisture-free, regulated air is required.
When a regulated supply of air is available, a condenser is used to separate oil and moisture from the air.
Conventional spray systems have basic similarities. There must be an adequate source of compressed
air, a paint supply, and a spray gun for controlling the combination of air and paint in an atomized cloud
against the surface to be coated.
Figure 3-46. Air transformer
3-15. Spray Booth. A permanent spray-paint shop requires a well-ventilated and well-illuminated
spray booth. Figure 3-47, page 3-39, shows a portable spray booth that is ventilated by the deflector
plate shown in the back. It is illuminated by floodlights recessed in the walls of the booth. Portable
floodlights should also be available for the