5.4
Spray Pattern Adjustments
The spray pattern of the PILOT WA 800 models can be adjusted as follows:
Adjusting the jet pattern
With internal control:
An optimum spray pattern can be regulated by using
adjustment screws
B
and
R
.
The adjustment screw
B
regulates the wide/flat jet,
the adjustment screw
R
regulates the round jet.
Without internal control:
The spray pattern is adjusted by a ressure regulator in the
plant (see operating instructions of plant systems manufac-
turer).
The connection
B
is for the wide/flat jet,
the connection
R
is for the round jet.
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 perfor-
med without using atomizing air, when the drawbar 2.
Adjustment of the Material Pressure
This adjustment can only be made at the pump or the material pressure 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
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 offers a great variety of air cap/-material nozzle/needle combinations for
this purpose.
1
2
B
R
B
R
7
8
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5.2
Starting / Stopping Requirements
The following requirements must be met before taking this spray gun into operati-
on:
• control air must be available at the gun.
• atomizing air must be available at the gun.
• material pressure must be available at the gun.
Caution
The material pressure shall not exceed
• 10 bar,
as, otherwise, the functional reliability of the spray gun will suffer.
Adjust the control air pressure to
• at least 4,5 bar, in order to operate the spray gun.
The operation of the spray gun can be started/stopped by way of the 3/2-way control
valve (see the Operating Instructions of the plant systems manufacturer).
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 Test
Spray pattern tests should be performed whenever:
• the spray gun is taken into operation for the first time.
• the spraying medium is changed.
• the spray gun was taken apart for servicing or repairs.
The spray pattern can be tested using a work piece sample, a sheet of metal,
cardboard or paper.
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
).
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