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 PILOT WA 450, WA 451, WA 452 and WA 453 can be adju-
sted as follows:
Adjustment of the control air
The control air is adjusted external by the plant (see Operating instructions of the
plant systems manufacturer).
Adjustment of the material flow rate
Turn cap 1 from the standard position (= notch
mark on the piston housing)
• 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 per
formed without using atomizing air (round - and
wide/flat air), when the drawbar 2 is used.
Adjustment of the Material Pressure
This adjustment can only be made at the controls of the pump or the material pressu-
re tank. Please comply with the operating instructions and safety warnings issued by
the manufacturers concerned.
Adjustment of the Round Jet and Wide/Flat Jet
The round jet and wide/flat jet are adjusted external by the plant (see Operating
instructions of the plant systems 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 control head/-material control nozzle/needle
combinations for this purpose.
Correction of Spray Pattern Imperfections
The following table shows how to correct a defective spray pattern.
5.5
Retooling of Spray Gun
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.
Note
In order to perform the following procedures please use the drawing at the begin-
ning of these operating instructions.
Replacement of Air Control Head
1. Unscrew the knurled air control head retaining ring in (pos. 1) from the front
part.
2. Pull the air control head in (pos. 2) of the gun front.
3. Position the required air control head on the front.
4. Screw the air control head retaining ring in (pos. 1) onto the front.
1
2
Desired spray pattern
l
l
l
7
8
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
Содержание WA 450
Страница 3: ...PILOT WA 450...
