Spray Gun Set-Up - Speedaire 4XP65B Mode D'emploi

Speedaire Operating Instructions
Model 4XP65B
Introduction
The spray gun is a vital link in any
finishing application. In addition to
operating the spray gun properly,
techniques of surface preparation and
paint preparation must be understood.
These instructions will explain the
differences among various spray
technologies and serve as a guide in
the proper operation and techniques
of spray painting. Refer to the
Replacement Parts Manual for model
specific information.
SPRAy GUN tERMS
Atomization – Conversion of bulk
liquid to spray droplets (mist).
Bleeder – In this mode, air passes
continuously through the gun whether
spraying or not. This mode is generally
used when the air is supplied by a
continuously running compressor that
does not have a tank.
Bleeder / Non-Bleeder – Indicates
whether air flows through the gun
continuously or as the trigger is pulled.
External Mix – Process where the air
and paint are mixed just after leaving
the nozzle. This type of mix should be
used for fast drying paints and when a
high quality finish is needed.
Feed – Method used to bring paint into
the gun for spraying.
Fluid Control knob – Used to control
the amount of paint being mixed with
air.
Gravity Feed – Method of paint feed
similar to the siphon feed method.
However, the cup is inverted to create a
positive fluid pressure at the nozzle.
Internal Mix – Process where the air
and paint are mixed inside the air cap
just before being sprayed. This method
is best for heavy bodied, slow drying
paints and can only be used with the
pressure feed method. Do not use fast
drying paints with internal mix. The
Air cap
Fluid tip (Nozzle)
Trigger
Figure 1
paint will dry inside and quickly clog
the air cap.
Mix – The mixing of paint and air when
spraying.
Non-Bleeder – In this mode, air
flows only when the trigger is pulled.
This type of operation is used with a
compressor equipped with a tank or
with a large factory air system.
Paint tank – An auxiliary pressurized
paint reservoir that allows continuous
spraying of large amounts of paint
without stopping for refills as with a
canister. It also allows using the spray
gun at any angle without causing paint
to drip.
Pattern Control knob – Used to form
the proper pattern (size and shape) of
paint as it is sprayed from the gun to
the workpiece.
Pressure Feed – Method of paint
feed where a canister or paint tank is
pressurized to force paint to the gun.
Either internal or external mix air caps
are used with this method. Pressure
feed is generally used for spraying
heavy bodied paints or for large size
projects.
Siphon Feed – Method of paint feed
where atmospheric pressure creates a
partial vacuum to siphon paint to the

Vent hole
Cup
Pattern control knob
Fluid control knob
1/4 inch NPS air
inlet fitting
gun. Only external mix air caps are used
with this method. Siphon feed is used
with light bodied paints.
Viscosity – A measurement of the
resistance to the flow of liquids.

Spray Gun Set-up

The pressure for atomization is
controlled at the air source. The
amount of fluid is adjusted by the fluid
control knob, the paint viscosity and
the air pressure.
The gravity feed cup screws onto the
top of the gun body creating a positive
fluid pressure in the nozzle (See
Figure 2).
Filtered,
Regulated
Air Source
Figure  - Gravity Feed Cup Set-up
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