Specifications

Figure 12 – Suction Feed and
Gravity Feed System Components
OPERATION
26. How is suction and gravity
feed equipment hooked up for
operation?
Connect the air supply from the
compressor outlet to the filter/air
regulator inlet.
Connect the air supply hose from
the air regulator outlet to the air
inlet on the spray gun.
After the material has been
reduced to proper consistency,
thoroughly mixed and strained into
the cup, attach the gun to the cup
(suction feed) or pour material into
attached cup (gravity feed).
27. How are suction and gravity
feed systems initially adjusted for
spraying?
(1) Spray a horizontal test pattern
(air cap horns in a vertical position).
Hold the trigger open until the paint
begins to run. There should be
relatively even distribution of the
paint across the full width of the
pattern. (see Figure 13). Adjust the
pattern width with the spreader
adjustment valve. If distribution is
not even, there is a problem with
either the air cap or the fluid tip
that must be corrected. Refer to
the Troubleshooting Section for
examples of faulty patterns to help
diagnose your problem.
Figure 13 - Horizontal Test Pattern
(2) If the pattern produced by the
above test appears normal, rotate
the air cap back to a normal
spraying position and begin spray-
ing. (Example - a normal pattern
with a #30 air cap will be about 9"
long when the gun is held 8" from
the surface).
Figure 14 – Fluid Adjustment Screw
(3) With the fluid adjusting screw
open to the first thread,(see figure
14) and the air pressure set at
approximately 30 psi, make a test
pass (move the spray gun 3 times
the normal speed) with the gun on
some clean paper, cardboard or
wood. If there are variations in
particle size- specks and/or large
globs - the paint is not atomizing
properly (see figure 15).
(4) If the paint is not atomizing
properly, increase the air pressure
slightly and make another test
pass. Continue this sequence until
the paint particle size is relatively
uniform.
Uneven Distribution
Even Distribution
Figure 15- Test Patterns
(5) If the pattern seems starved for
material, and the fluid adjustment
screw allows full needle travel, the
fluid tip may be too small or the
mater-ial may be too heavy.
Recheck the viscosity or increase
the size of the fluid tip and needle
(6) If the material is spraying too
heavily and sagging, reduce the
material flow by turning in the fluid
adjusting screw (clockwise).
Remember, proper setup utilizes no
more fluid and air pressure than is
needed to produce the required
quality and a flow rate that will
meet production requirements.
2. Air Atomizing Spray Guns (Cont’d)
9