Walther PILOT WA XV Instructions De Service page 18

Middle-air adjustment (only PILOT WA XV-ND)
The adjusting screw
Adjustment of the Material Flow Rate
1. Turn the material Input regulating screw
the matrial needle adjuster) in
• - direction = decrease of flow rate.
• + direction = increase of flow rate.
Adjustment of the Material Pressure
This adjustment can only be made at the controls of the pumping or circulation system
or material pressure tank. Please comply with the Operating Instructions and Safety
Warnings issued by the manufacturers concerned.
Adjustment of the Atomisation Air Pressure
The atomizing air Pressure is to be 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 offer a great
variety of air cap/material nozzle/-needle combinations for this purpose.
Correcting of Spray Pattern Imperfections
The table below shows what to do to correct a spray pattern.
Spray pattern test Fault
Swollen centre
Swollen ends
Coarse pearl effect
Unduly thin paint
layer in centre
Split centre
Split centre
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is used to adjusted the middle-air.
from its normal position (= notch mark an
desired spray pattern
Necessary adjustment
• Spray jet should be flatter
• Spray jet should be rounder
• Increase atomising air pressure
• Decrease atomising air pressure
• Increase nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
• Decrease material pressure
• Increase atomising air pressure
5.5 Retooling of Spray Gun
Combinations of air cap, material nozzle + needle, designed to match specific
spraying media types and grades, form a unit - namely the nozzle insert assembly,
which must always be interchanged as a complete assembly to maintain the desi-
red spray- finish quality standard.
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.
Replacement of Air Cap
1. Unscrew the knurled air cap retaining ring
2. Pull the air cap
3. Position the required air cap an the gun
4. Screw the air cap retaining ring
Replacement of Material Nozzle and Needle
WA XV:
1. Remove all Pressures from the gun (see
2. Remove the air control head (see 5.5
3. Unscrew the material nozzle
4. Unscrew the material Input regulating
5. Pull the two spring pins
6. Unscrew the spring retaining bush
.
off the gun front attach-
ment.
front attachment.
onto the
gun front attachment.
5.2 Starting / Stopping Requirements).
Replacement of Air Cap).
from the
gun front attachment (use a Size 12 mm
wrench).
screw .
off.
Size 27 mm wrench).
(use a
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