35
34
Middle-air adjustment (only PILOT WA XV-HVLP)
Adjustment of the Material Flow Rate
1. Turn the material Input regulating screw
from its normal position (= notch
mark an 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
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 (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.
desired spray pattern
Spray pattern test
Fault
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 atomising air pressure
Material application in the
centre of the spray pat-
tern is very thin
• Decrease the atomising air pressure
Spray pattern is split in
the centre
• Increase the nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
Spray pattern is very
spherical
• Reduce material pressure
• Increase atomising air pressure
The adjusting screw
is used to adjusted the
middle-air.
5.5
Retooling of Spray Gun
Combinations of air cap, material 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 desired
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
Replacement of Material Nozzle and Needle
WA XV / WA XV-HVLP / WA XV rotary jet:
1. Unscrew the knurled air cap retaining ring
.
2. Pull the air cap
off the gun front attach-
ment.
3. Position the required air cap an the gun
front
attachment.
4. Screw the air cap retaining ring
onto the
gun front attachment.
1. Remove all pressures from the gun (see
5.2 Starting / Stopping Requirements
).
2. Remove the air control head (see
5.5
Replacement of Air Cap
).
3. Unscrew the material nozzle
from the
gun front attachment (use a Size 12 mm
wrench).
4. Unscrew the material input regulating
screw
.
5. Pull the two spring pins
off.
6. Unscrew the spring retaining bush
(use
a size 27 mm wrench).
7. Remove the compression spring
from
the gun body.
