Specifications

Introduction
All spray painting systems - from
the smallest brush to the most
sophisticated finishing system-
must have containers to hold the
material being applied.
Material container types and sizes
vary considerably, depending on
the kind of spraying system being
used.
This chapter will discuss these
containers, their particular applica-
tions, their construction and
maintenance.
1. What are material containers?
Any container which serves as a
material supply reservoir for the
spray gun. These containers are
usually made of metal or plastic
with capacities of 1/2 pint or more.
2. What are the types of material
containers?
There are three common types of
cups which attach to the gun itself:
Siphon, Gravity and Pressure.
There are also remote pressure
cups and tanks, which are located
away from the gun. See Page 4 for
types of guns and systems.
3. Where are cup containers
used?
Cup containers are typically one
quart or less, and are used where
relatively small quantities of
material are being sprayed.
4. How are material feed cups
attached to lid assemblies?
Cups are attached using a lid
assembly (sometimes called a cup
attachment) that either clamps A or
screws B onto the cup container.
(see Figure 1) Some lid assemblies
are detachable from the gun, while
others are integral parts and do not
detach from less expensive models.
AB
Figure 1 - Cup Attachment Styles
5. What capacity does a pressure
feed cup have?
A pressure feed cup can have a
one or two quart capacity.
Anything larger is considered a
pressure feed tank, which may be
positioned some distance from the
gun.
Figure 2 - Regulated 2 Qt. Pressure
Cup
6. How do pressure feed tanks
work?
Pressure feed tanks are closed
containers, ranging in size from
about two gallons to 60 gallons.
They provide a constant flow of
material, under constant pressure,
to the spray gun.
The tank is pressurized with clean,
regulated, compressed air, which
forces the fluid out of the tank
through the fluid hose to the gun.
The rate of fluid flow is controlled
by increasing or decreasing the air
pressure in the tank.
A typical pressure feed tank
consists of: the shell A, clamp-on
lid B, fluid tube C, fluid outlet D,
regulator E, gauge F, safety relief
valve G, and agitator H (see
figure 3).
Pressure feed tanks are available
with either top or bottom fluid
outlets, and with various
accessories.
Figure 3 - Pressure Feed Tank
7. Where are pressure feed tanks
recommended?
Pressure feed tanks provide a
practical, economical method of
feeding material to the gun over
extended periods of time.
They are mostly used in continuous
production situations, because the
material flow is positive, uniform
and constant.
Tanks can be equipped with
agitators (see Figure 3) that keep
the material mixed and in
suspension.
3. Material Containers
16