Figure 14-39.—Air compressors.
Air Compressors
To use a spray gun, you need a source of
compressed air. Figure 14-39 shows two types of air
compressors—a portable unit and a stationary unit.
Both types are commonly used. The portable unit
consists of an electric or gasoline engine, compressor,
storage tank, automatic unloader mechanism, wheels,
and a handle. The stationary unit consists of an
electric motor, compressor, storage tank, centrifugal
pressure release, pressure switch, and mounting feet.
In addition to the standard spray equipment,
special types have been developed for the occasional
or small touchup job. There are many types avail-
able. Figure 14-40 shows one that consists of a
self-contained power unit with an attached spray
bottle (container).
power unit with a
and on the bottom,
The essential features include the
push-button spray cap on the top
and a screw lid that attaches to the
container. A dip tube extends from the bottom of the
power unit into the sealant. The power unit contains
the propellant.
Air Regulators
The air regulator (transformer) is used to regulate
the amount of pressure to the spray gun and to clean
the air.
The air delivered to the regulator always
contains some oil from the compressor, some water
caused by condensation, and many particles of dirt
and dust.
14-42
