Operating Instructions

 

 

Gravity Feed Spray Gun

 

 

 

 

 

 

 

 

 

Introduction

Non-Bleeder – In this mode, air

produced which

 

 

 

 

Conventional

 

The spray gun is a vital link in any

flows only when the trigger is pulled..

increases control

 

 

 

 

 

This type of operation is used with a

and reduces

 

 

 

finishing application.. In addition to

 

 

 

compressor equipped with a tank or

bounceback and

 

 

 

operating the spray gun properly,

 

 

 

with a large factory air system..

overspray (See

 

 

 

techniques of surface preparation and

 

 

 

 

Figure 1).. For

 

 

 

paint preparation must be understood..

Paint Tank – An auxiliary pressurized

 

HVLP

 

these reasons,

 

 

These instructions will explain the

paint reservoir that allows continuous

 

 

 

HVLP is also well

 

 

 

differences among various spray

spraying of large amounts of paint

 

 

 

suited for spraying

 

 

 

technologies and serve as a guide in

without stopping for refills as with a

 

 

 

parts with

 

 

 

the proper operation and techniques

canister.. It also allows using the spray

 

Figure 1

recessed areas..

 

of spray painting.. Refer to the

gun at any angle without causing paint

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replacement Parts Manual for model

to drip..

Spray Gun Setup

specific information..

Pattern Control Knob – Used to form

 

The pressure for atomization is

Spray Gun Terms

the proper pattern (size and shape) of

controlled at the air source.. The amount

Atomization – Conversion of bulk

paint as it is sprayed from the gun to

of fluid is adjusted by the fluid control

the workpiece..

liquid to spray droplets (mist)..

knob, the paint viscosity and the air

Pressure Feed – Method of paint

 

Bleeder – In this mode, air passes

pressure..

 

 

 

feed where a canister or paint tank is

 

 

 

continuously through the gun whether

The gravity feed cup screws onto the

pressurized to force paint to the gun..

spraying or not.. This mode is generally

top of the gun body creating a positive

Either internal or external mix air caps

used when the air is supplied by a

fluid pressure in the nozzle (See

are used with this method.. Pressure

continuously running compressor that

Figure 2)..

 

 

 

feed is generally used for spraying

 

 

 

does not have a tank..

 

 

 

 

 

 

 

 

 

 

heavy bodied paints or for large size

 

 

 

 

 

 

 

Bleeder/Non-Bleeder – Indicates

 

 

 

 

 

 

 

 

 

 

 

 

 

 

projects..

 

 

 

 

 

 

 

whether air flows through the gun

 

 

 

 

 

 

 

Siphon Feed – Method of paint feed

 

 

 

 

 

 

 

continuously or as the trigger is pulled..

 

 

 

 

 

 

 

where atmospheric pressure creates a

 

 

 

 

 

 

 

External Mix – Process where the air

 

 

 

 

 

 

 

partial vacuum to siphon paint to the

 

 

 

 

 

 

 

and paint are mixed just after leaving

 

 

 

 

 

 

 

gun.. Only external mix air caps are used

 

 

 

 

 

 

 

the nozzle.. This type of mix should be

 

 

 

 

 

 

 

with this method.. Siphon feed is used

 

 

 

 

 

 

 

used for fast drying paints and when a

 

 

 

 

 

 

 

with light bodied paints..

 

 

 

 

 

 

 

high quality finish is needed..

 

 

 

 

 

 

 

Viscosity – A measurement of the

 

 

 

 

 

 

 

Feed – Method used to bring paint into

 

 

 

 

 

Filtered,

resistance to the flow of liquids..

 

 

 

 

 

the gun for spraying..

 

 

 

 

 

Regulated

 

 

 

 

 

 

Fluid Control Knob – Used to control

Conventional vs. HVLP

 

 

 

 

 

Air Source

Conventional spray guns use a much

 

 

 

 

 

 

 

the amount of paint being mixed with

 

 

 

 

 

 

 

higher air cap pressure to atomize paint

 

 

 

 

 

 

 

air..

 

 

 

 

 

 

 

than HVLP spray guns.. This results in

 

 

 

 

 

 

 

Gravity Feed – Method of paint feed

 

 

 

 

 

 

 

more overspray and a lower transfer

 

 

 

 

 

 

 

similar to the siphon feed method..

 

 

 

 

 

 

 

efficiency..

Figure 2 - Gravity Feed Cup Set-up

However, the cup is inverted to create a

 

HVLP, electrostatic and airless processes

 

 

 

 

 

 

 

positive fluid pressure at the nozzle..

 

 

 

 

 

 

 

are currently the only compliant spray

 

Water/Oil in compressed Air

Internal Mix – Process where the air

 

methods that meet the strict 65%

 

 

 

 

 

 

 

 

and paint are mixed inside the air cap

All compressor pumps discharge some

transfer efficiency criteria required by

just before being sprayed.. This method

condensed water, oil or contaminates

some air quality management districts..

is best for heavy bodied, slow drying

with the compressed air..

This enhanced transfer efficiency

paints and can only be used with the

Important: This condensation

results in a significant material savings

pressure feed method.. Do not use fast

compared to conventional spraying..

will cause “fish eyes” to appear in

drying paints with internal mix.. The

Check local, state and national

the paint job.. Install appropriate

paint will dry inside and quickly clog the

regulations that may be in effect before

water/oil removal equipment and

air cap..

performing any spraying operations..

controls as necessary for the intended

 

Mix – The mixing of paint and air when

HVLP spraying is a growing trend

application.. Locate filter as close to

spraying..

spray gun as possible..

in the finishing industry due to

 

 

 

 

 

 

Failure to install

 

its environmental friendliness.. By

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

appropriate

 

definition, dynamic air pressures in the

 

 

 

 

 

 

water/oil removal equipment may

 

air cap must be 10 psi or less to qualify

 

result in damage to machinery or

 

as HVLP.. A soft, low velocity pattern is

workpiece.

 

 

 

 

 

 

 

 

 

 

 

 

3

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