Husky HDS790 Mode D'emploi page 2

Operating Instructions and Parts Manual
General Safety Gravity Feed – Method of paint feed
similar to the siphon feed method.
Information
However, the cup is inverted to create a
positive fluid pressure at the nozzle.
WARNING
!
Internal Mix – Process where the air
Do not use pressure that
and paint are mixed inside the air cap
exceeds the operating pres-
just before being sprayed. This method
sure of any of the parts
is best for heavy bodied, slow drying
(hoses, fittings, etc.) in the painting
paints and can only be used with the
system.
pressure feed method. Do not use fast
Keep hose away
drying paints with internal mix. The
CAUTION
!
from sharp objects.
paint will dry inside and quickly clog
Bursting air hoses may cause injury.
the air cap.
Examine air hoses regularly and replace
Mix – The mixing of paint and air when
if damaged.
spraying.
7. Always use a pressure regulator on
Non-Bleeder – In this mode, air flows
the air supply to the spray gun.
only when the trigger is pulled. This
Failure to install
NOTICE
type of operation is used with a com-
appropriate
pressor equipped with a tank or with a
water/oil removal equipment may
large factory air system.
result in damage to machinery or
workpiece.
Paint Tank – An auxiliary pressurized
paint reservoir that allows continuous
Introduction
spraying of large amounts of paint with-
out stopping for refills as with a canister. It
The spray gun is a vital link in any fin-
also allows using the spray gun at any
ishing application. In addition to oper-
angle without causing paint to drip.
ating the spray gun properly, tech-
niques of surface preparation and paint Pattern Control Knob – Used to form
preparation must be understood. These
the proper pattern (size and shape) of
instructions will explain the differences
paint as it is sprayed from the gun to
among various spray technologies and
the workpiece.
serve as a guide in the proper opera-
Pressure Feed – Method of paint feed
tion and techniques of spray painting.
where a canister or paint tank is pressur-
Refer to the Replacement Parts Manual
ized to force paint to the gun. Either
for model specific information.
internal or external mix air caps are used
with this method. Pressure feed is gener-
SPRAY GUN TERMS
ally used for spraying heavy bodied
Atomization - Conversion of bulk liq-
paints or for large size projects.
uid to spray droplets (mist).
Siphon Feed – Method of paint feed
Bleeder – In this mode, air passes con-
where atmospheric pressure creates a
tinuously through the gun whether
partial vacuum to siphon paint to the
spraying or not. This mode is generally
gun. Only external mix air caps are used
used when the air is supplied by a con-
with this method. Siphon feed is used
tinuously running compressor that does
with light bodied paints.
not have a tank.
Viscosity – A measurement of the
Bleeder/Non-Bleeder – Indicates
resistance to the flow of liquids.
whether air flows through the gun con-
tinuously or as the trigger is pulled.
CONVENTIONAL VS. HVLP
External Mix – Process where the air Conventional spray guns use a much
and paint are mixed just after leaving
higher air cap pressure to atomize
the nozzle. This type of mix should be
paint than HVLP spray guns. This results
used for fast drying paints and when a
in more overspray and a lower transfer
high quality finish is needed. efficiency.
Feed – Method used to bring paint into
HVLP, electrostatic and airless processes
the gun for spraying.
are currently the only compliant spray
methods that meet the strict 65%
Fluid Control Knob – Used to control
transfer efficiency criteria required by
the amount of paint being mixed with
some air quality management districts.
air.
All manuals and user guides at all-guides.com
HVLP Gravity Feed Spray Gun
This enhanced transfer efficiency results
in a significant material savings com-
pared to conventional spraying. Check
local, state and national regulations
that may be in effect before perform-
ing any spraying operations.
HVLP spraying is a
Conventional
growing trend in
the finishing
industry due to its
environmental
friendliness. By
definition,
HVLP
dynamic air pres-
sures in the air
cap must be 10
psi or less to qual-
Figure 1
ify as HVLP. A
soft, low velocity pattern is produced
which increases control and reduces
bounceback and overspray (See Figure
1). For these reasons, HVLP is also well
suited for spraying parts with recessed
areas.
Spray Gun Set-up
The pressure for atomization is con-
trolled 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 2 - Gravity Feed Cup Set-up
Preparation
1. Thoroughly mix and thin paint in
accordance with the paint manufac-
turer's instructions. Most materials
will spray readily if thinned
2
Operating Instructions and Parts Manual
Instructions d'Utilisation et Manual de Pièces
Pistolet Vaporisateur à Alimentation par Gravité HVLP
Manual de Instrucciones y Lista de Piezas
Notes
Notas
HVLP Gravity Feed Spray Gun
Pistola Pulverizadora HVLP Alimentada por Gravedad
27