Working Principle; Description Of The Operating Controls; Viscosity Testing - Westfalia 17 42 43 Instruction Manual

Working Principle

The compressed air spray gun operates on the suction principle. The com-
pressed air, which delivers the spraying material, is connected to the air inlet (4)
and is lead through the gun body. The air passes the nozzle when pressing the
trigger (5). An underpressure is generated by the high air flow speed. As a result,
the spraying material is drawn from the material cup (12) through the standpipe
(7) and delivered and atomised at the same time.

Description of the Operating Controls

Trigger (5): Press the trigger fully to open the compressed air inlet and to deliver
and spray the paint. Release the trigger to close the air inlet. Use the trigger to
regulate the air flow.
Air Flow Regulator (1): Use the air flow regulator to limit the possible air intake
pressure. Turn the air flow regulator counter clockwise. Now the trigger can be
depressed deeper. The air intake pressure can increase which leads to a higher
paint flow rate. This way you can adjust the flowing material rate. The material
flow also depends on the nature of the material to be processed and its viscosity.
Spray Pattern Regulator (10): The spray pattern can be adjusted to create a wide
spray jet or a pointy spray jet. Turn the spray pattern regulator counter clockwise
to create a wider spray jet. Turn the spray pattern regulator clockwise to create a
more pointy spray jet. Use a more pointy spray jet to paint smaller sections or
openings and corners.
Nozzle (8): For a high jet (vertically), align the
nozzle horizontally (figure 1) and open the spray
pattern regulator. Use this setting for spraying
larger areas.
For a wide jet (horizontally), align the nozzle
vertically (figure 2).

Viscosity Testing

Viscosity is the flow rate of a material. Measure
the viscosity with a viscosity cup (not included) as
follows:
1. Thin the paint according to the manufacturer's recommendation. Start with less
thinner so you still can and add some thinner later.
2. Mix the paint thoroughly. Pour the paint into the viscosity cup or dip the cup to
the edge into the paint.
Using
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