Technical data

completely drain, minimizing paint waste. Gravity feed guns
supply paint to the orifice solely by means of gravity. The air
pressure at the orifice of these guns is typically 40 to 50 psi.
4.3.4 Material Containers. Two types of containers
serve as material reservoirs for spray guns, the cup and the
tank. Both cups and tanks are available with agitators to
provide constant mixing to keep materials in suspension
during application. Agitators are mechanically operated by
either an air or an electrical powered motor. See Chapter 6 to
determine which coatings require agitators.
4.3.4.1 Cup containers are used when small quantities of
paint are to be sprayed. They are generally of the suction type
with a small vent on top of the container through which
atmospheric pressure operates to force material up to the fluid
tip when a compressed air stream creates a vacuum at the
spray opening.
4.3.4.2 Pressure feed tanks are used for high volume
painting. Pressure feed tanks are tightly closed metal contain-
ers of varying size (2 to 120 gallons) that provide material at
a uniform pressure and a constant rate of flow. Compressed
air is directed into the tank to force the material out. Air
pressure must be increased or decreased to change the rate of
flow.
TO 1-1-8
4-3