27
26
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
2. Inspect the sample and readjust the settings of the gun as may be required
Warning
It is important to remember that the spray gun must be relieved of all pressures
whenever work is terminated. Lines left in pressurized condition could burst, with
their contents likely to injure anybody present nearby.
5.3
Spray Pattern Adjustments
The spray pattern of the spray gun PILOT WA 650 can be adjusted as follows:
Adjusting the jet pattern
Adjustment of the material flow rate
Adjustment of the Material Pressure
This adjustment can only be made at the controls of the pump or the material pres-
sure 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 com-
pressor system. Please comply with the operating instructions and safety warnings
issued by the manufacturer.
If you wish to change the spraying pattern beyond the adjustments outlined so far,
you must retool the spray gun.
WALTHER Spritz- und Lackiersysteme GmbH offers a great variety of air control
head/-material control nozzle/ needle combinations for this purpose.
5.4
Correcting of Spray Pattern Imperfections
The following table shows what to do to correct a spray pattern.
Spray pattern test
Deviation
Required adjustment
Spray pattern is split in the centre • setting a wider spray pattern
Spray pattern is too thick at the
ends
• Setting a more rounded spray
pattern
The spray pattern shows rather
large droplets
• Increase the nozzle air pres-
sure
Material application in the centre
of the spray pattern is very thin
• Decrease the nozzle air pres-
sure
Spray pattern is split in
the centre
• Increase the nozzle diameter
• Reduce nozzle air pressure
• Increase material pressure
Spray pattern is very spherical
• Reduce material pressure
• Increase nozzle air pressure
6
Retooling / Repairs
Combinations of air control head, material control nozzle and needle, designed to
match specific spraying media tpyes and grades, form a unit - namely the nozzle
insert assembly. In order maintain the desired spray-finish quality standard always
replace the complete nozzle insert assembly.
Warning
Prior to retooling: Make sure that the spray gun is in unpressurized condition, i.e. all
air and material inputs must be shut off - if not, imminent risk of injury.
Notice
In order to perform the following procedures please use the drawing at the beginning
of these operating instructions.
6.1
Replacement of
Air Cap
1. Unscrew the air cap (item 1) from the front body (item 4).
Turn cap (1) from the standard position
(= notch mark on the piston housing)
• to the inside in order to decrease the mate-
rial flow rate.
• to the outside in order to increase the mate-
rial flow rate.
1
1
2
An optimum spray pattern can be adjusted by using adju-
sting screws (1) and (2).
The adjusting screw (1) regulates the wide jet, the adjusting
screw (2) the round jet.
desired spray result
