Spray Pattern Adjustments; Correcting Spray Pattern Flaws; Spray Pattern Test; Retooling And Repairs - WALTHER PILOT TWIN Instrucciones De Servicio

Attention
The material pressure may not be set higher than 6 bar. The air pressure may not
exceed 6 bar.
Warning
Always relieve the pressure from the spray gun after work is completed. The pressu-
rized lines may rupture and persons standing nearby may be injured by the escaping
material.
Note
The gun must be flushed before use to prevent contamination of the spraying mate-
rial.
6

Spray pattern adjustments

You can change the spray pattern on the PILOT TWIN by making the following set-
tings:
Adjusting the spray jet:
The spray jet is controlled by replacing or removing the air distribution ring (Item 2). There are
three possibilities:
1.
no air distribution ring air distribution ring without
(Spraying angle approx. 60°)
= large wide jet = round jet
Setting the material flow rate:
The material output depends on the size of the
nozzle installed - and may also be controlled by
way of adjusting the needle adjustment screw
(Item 14).
Adjusting the atomising air low rate:
The atomising air flow rate can be adjusted by the
air pressure reducing valve in the plant.
Air connection
Material connection
3.
2.
4-hole air distribution ring
hole
(Spraying angle approx. 30°)
= medium wide jet
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6.1

Correcting spray pattern flaws

The following table shows the settings you can use to change the spray pattern.
Spray pattern Deviation
test
Spray pattern is split in
the centre
Spray pattern is too thick
at the ends
The spray pattern shows
rather large droplets
Material application in the
centre of the spray pattern
is very thin
Spray pattern is split in
the centre
Spray pattern is very
spherical
7

Retooling and repairs

If a jet contour other than already described is desired, the spray gun has to be
retooled. The suitable material air control head, material nozzle and needle-combina-
tion form together a unit - the nozzle set. Always change the complete insert assembly
to maintain the desired finish quality.
Warning
Prior to any retools or replairs: Make sure that the spray gun is in depressurized con-
dition, i.e. all air inputs must be shut off - if not, imminent Risk of Injury.
Note
In order to perform the following procedures, please refer to the exploded diagram in
the beginning of these operating instructions.
7.1

Replacement of the material nozzle and the air cap

1. Remove the air cap (Item 1) from the gun body (item 6).
2. Pull the air distribution ring (Item 2) off the material nozzle.
3. Remove the material nozzle (Item 3) from the gun body; using a Size 9 wrench.
Reassemble in reverse order.
desired spray result
Required adjustment
• setting a wider spray pattern
• Setting a more rounded spray
pattern
• Increase the nozzle air pres-
sure
• Decrease the nozzle air pres-
sure
• Increase the nozzle diameter
• Reduce nozzle air pressure
• Increase material pressure
• Reduce material pressure
• Increase nozzle air pressure
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