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6. Adjust the Spray Pattern (continued)
NOTE:
D If the fluid adjustment knob is turned in all the way
the gun will emit only air.
D For continuous spraying, turn the fluid adjustment
knob (8) counterclockwise until no restriction of the
trigger movement is felt. When the knob is turned
out far enough, the trigger should be able to touch
the gun handle when the gun is triggered. For the
typical fluid adjustment knob setting, turn the knob
out 1/2 turn more. This setting provides maximum
fluid flow and prevents premature wear on the fluid
nozzle.
E. Open the pattern adjustment valve (25) by turning
the knob fully counterclockwise to achieve a full
fan pattern.
25
Close
(narrower
pattern)
Fig. 12
F. Using the air pressure regulator (F), adjust the gun
air supply pressure until you have the desired at-
omization. Use the lowest possible air pressure
that will give you this atomization. See the Pres-
sure Drop Charts for regulator setting versus gun
inlet pressure comparison.
Fig. 13
12
308742
Setup
Open
(wider
pattern)
7023A
F
01997
G. Test the spray pattern and atomization while hold-
ing the gun about 8 to 10 inches (200 to 254 mm)
from the test piece.
H. If the spray pattern is too wide with the pattern ad-
justment knob (13a) turned fully counterclockwise,
turn the pattern adjustment knob clockwise until
you have the desired pattern size.
NOTE:
urning the pattern adjustment knob fully
T
clockwise will produce a round pattern.
I.
Check the atomization quality again. Increase the
gun air supply pressure with the air pressure regu-
lator in 5 psi (34 kPa, 0.3 bar) increments until you
obtain the desired atomization.
J. If after increasing the gun air supply pressure the
atomization is still unacceptable, try installing a
larger fluid nozzle size to reduce the fluid velocity.
Refer to Fig. 10. Repeat steps 6-E to 6-I until you
obtain the desired atomization.
Pressure Drop Charts
Expected pressure drops measured using 25 ft.
(7.625 m) long hose with gun triggered.
5/16 inch (7.9 mm) I.D. hose
Recommended hose size to minimize excessive
pressure drop.
Air Regulator Pressure
Setting
psi (kPa, bar)
19 (132, 1.3)
30 (210, 2.1)
43 (301, 3.0)
55 (379, 3.8)
66 (451, 4.5)
77 (528, 5.2)
89 (612, 6.1)
1/4 inch (6.3 mm) I.D. hose
This size not recommended due to excessive pressure
drop.
Air Regulator Pressure
Setting
psi (kPa, bar)
31 (217, 2.2)
49 (342, 3.4)
65 (444, 4.4)
81 (557, 5.6)
95 (654, 6.5)
Gun Inlet Pressure
psi (kPa, bar)
10 (70, 0.7)
20 (140, 1.4)
30 (210, 2.1)
40 (280, 2.8)
50 (345, 3.4)
60 (410, 4.1)
70 (480, 4.8)
Gun Inlet Pressure
psi (kPa, bar)
10 (70, 0.7)
20 (140, 1.4)
30 (210, 2.1)
40 (280, 2.8)
50 (345, 3.4)
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