Warning
Keep away from the front of the spray gun - imminent risk of injury.
Warning
Make sure that nobody is present in the spraying zone when the gun is started -
imminent Risk of Injury.
1. Start the gun to produce a spray pattern sample (see
5.2. Starting/Stopping
Requirements
).
2. Inspect the sample and readjust the settings of the gun as may be required
(see
5.4 Spray Pattern Adjustments
).
5.4
Spray Pattern Adjustments
The spray pattern of the of the series PILOT WA 7XX models can be adjusted as
follows:
Adjusting the jet pattern
Adjustment of the material flow rate
R
B
The spray pattern is adjusted by a ressure
regulator in the plant (see operating
instructions of plant systems manufacturer).
The connection
B
is for the wide jet,
the connection
R
is for the round jet.
Turn cap (1) from the standard position.
• to the inside in order to decrease the material
flow rate.
• to the outside in order to increase the material
flow rate.
The material flow through the nozzle can be
performed without using atomizing air, when the
drawbar (2).
8
2
1
Adjustment of the Material Pressure
This adjustment can only be made at the pump or the material pressure tank.
Please comply with the operating instructions and safety warnings issued by the
manufacturers concerned.
Adjustment of the Atomizing Air Pressure
The atomizing air pressure is adjusted at the air pressure reducing valve of the
compressor system. Please comply with the operating instructions and safety war-
nings issued by the manufacturer.
If you wish to change the spraying pattern beyond the adjustments outlined so far,
you must retool the spray gun (See
5.5 Retooling of Spray Gun
).
WALTHER offers a great variety of air cap/-material nozzle/needle combinations for
this purpose.
Correcting of Spray Pattern Imperfections
The following table shows what to do to correct a spray pattern.
desired spray result
Spray pattern
test
Fault
Necessary adjustment
Swollen centre
• Spray jet should be flatter
Swollen ends
• Spray jet should be rounder
Coarse pearl effect
• Increase atomising air
pressure
Unduly thin paint layer in
centre
• Decrease atomising air
pressure
Split centre
• Increase nozzle diameter
• Reduce atomising air
pressure
• Increase material pressure
Split centre
• Decrease material pressure
• Increase atomising air
pressure
9
