14
15
With internal control:
When the 3/2-way control valve is operated, the control air required for the cylinder
chamber of the spray gun opens the atomizer air and subsequently the material
supply. You can set the spray pattern shape in the PILOT WA 900 / WA-920 and
WA HVLP 940-HVLPPLUS with the control screws (Items 33 and 34) on the gun.
If the air control is interrupted by the 3/2-way valve again, first the compressed air in
the cylinder escapes. The spring pressure of the piston spring then pushes the
material needle back into its initial position, closes the material supply and finally
the atomizing air.
With external control:
First, the atomizing air (round and wide jet) should be switched on by an external
3/2-way control valve. After that,the control air should be activated by another 3/2-
way control valve. Thepistong and the material needle need be pushed back in order
to open the material supply.
In models PILOT WA 905 / WA-925 and WA HVLP 945-HVLPPLUS the shape of
the spray pattern is adjusted on the two-site air pressure regulator on the system.
When the control air is interrupted by the 3/2-way control valve, the spring pressure
moves the piston and the fluid needle back in its original position and closes the
material feed to the material nozzle. Subsequently, the atomizing air should be be
turned off.
The material flow rate is regulated in all models by the material pressure and the air
cap (Item 26). The material flow of the automatic spray gun series PILOT WA 900
can also be opened by hand with the tie rod (item 27) to clean, for example, a
clogged material nozzle. .
The guns of the PILOT WA 900 series can be connected to pressure tanks or pump
systems.
The models
PILOT WA 920-HVLP
a
nd WA 925-HVLP
are low pressure spray guns
working with a spraying air pressure of
0
.
7 bar
at an intake air pressure of
4
.
5 bar.
With the models
PILOT WA 940-HVLP
PLUS
and
WA 945-HVLP
PLUS
the intake
air pressure ranges from
3
.
0
to
3
.
3 bar
for a spraying air pressure of
1
.
2
to
1
.
4 bar.
3
3.1
Safety Warnings
Safety Warning Symbols
Warn
i
ng
This picture and the accompanying warning note
"Warning"
indicate possible risk
and dangers to yourself.
Caution
This picture and the accompanying note
"Caution"
indicate possible damage to
equipment, workpieces, etc.
Notice
This picture and the accompanyingnote
"Notice"
indicate additional and useful
information to help you in handling the spray gun with even greater confidence and
efficiency.
3.2
General Applicable Safety Precautions
►
All applicable accident prevention rules and regulations as well as other
recognized industrial safety and health rules and regulations must be observed at
all times
►
Use the spray gun only in well-ventilated rooms. Fires, naked light and smoking
are strictly prohibited in the working area. WARNING - during the spraying of
flammable materials (e.g. lacquers, adhesives, cleaning agents, etc), there is an
increased risk to health as well as an increased risk of explosion and fire.
►
You must ensure that the spray gun is properly grounded, either separately or in
connection with the equipment with which it is being used
(max.
resistance
10
6
Ω
).
►
Before carrying out any maintenence or service work, always ensure that the air
and material feed to the spray gun have been de-pressurized. Risk of injury!
►
When spraying, do not place your hands or other body parts in front of the nozzle
of the spray gun. Risk of injury!
►
Never point the spray gun at persons or animals. Risk of injury!
►
Always observe the spraying and safety instructions given by the manufacturers
of the spraying material and the cleaning agent. Aggressive and corrosive
materials in particular can be harmful to health.
►
Always wear hearing protection when using the gun or when in vicinity of a gun
that is in use. The noise level generated by the spray gun is approx. 86 dB(A).
►
Exhaust air containing particles (overspray) must be kept away from the working
area and presonnel. In spite of these measures, always wear the regulation
breathing masks and protective overalls when using the gun. Airborne particles
represent a serious health hazard!
►
After carrying out assembly or maintenance work, always ensure that all nuts,
bolts and screw connections have been fully tightened before the gun is used.
►
Use only original replacement parts, since WALTHER canonly guarantee safe
and fault-free operation for original parts.
►
For further information on the safe use of the spray gun and the spraying
materials, please contact
WALTHER Spritz- und
Lackiersysteme GmbH, D-42327
Wuppertal.
4
4.1
Mounting
Standard or Recirculation
The guns of WA series 900 are completely factory assembled. They are supplied as
standard with the locking pin (Item 37) installed. In this
Summary of Contents for PILOT WA 900
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