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SB-2-001-F   Page 3

Figure 3  Gravity Feed Gun With Cup on Top

Gravity feed guns are ideal for small applications
such as spot repair, detail finishing or for finishing in
a limited space. They require less air than a suction
feed gun and usually have less overspray.

A pressure feed system is normally used when large
quantities of material are to be applied, when the
material is too heavy to be siphoned from a container
or when fast application is required.

Figure 5   Pressure Feed Air Cap

PRINCIPLES OF AIR SPRAY

Spray application is perhaps the simplest method of
coating where a sizeable area or volume of material
is involved or when intricate shapes and irregular
surfaces require painting. Spray will give the most
uniform film thickness making it easy to obtain a
smooth finish.

The air spray gun is a tool which uses compressed
air to atomize paint, or other sprayable material, and
to apply it to a surface. Air and material enter the
gun through separate passages, and are mixed at
the air cap in a controlled pattern. Air spray guns
may be classified in various ways. Two  ways of
classifying guns are  by the location of the material
container and the material feed system. Figure 1
shows a gun with a cup attached below. This is
called  Suction Feed which draws material to the
gun by suction. Figure 3 is a gun with a cup attached
above. This is called Gravity Feed  - the material
travels down, carried by gravity. Figure 4

 

shows a

material container some distance away from the
spray  gun. This is Pressure Feed - the material is
fed by positive pressure. Suction feed is easily
identified by the fluid tip extending slightly beyond
the face of the air cap, as shown in Figure 2.  Suction
feed guns are suited to many color changes and to
small amounts of material, such as in touchup or
lower production operations.

Figure 2  Suction Feed Air Cap

Figure 4 Typical Pressure Feed Gun With Remote
Cup

Figure 1  Suction Feed Gun with Attached Cup

Fluid
 Tip

Air Cap

Air Cap

Fluid
 Tip

Содержание SB-2-001-F

Страница 1: ...LLETIN SB 2 001 F Replaces SB 2 001 E IMPORTANT Beforeusingthisequipment readall safety precautions and instructions in this manual Keep for future use SPRAY GUN TROUBLESHOOTING AND PREVENTIVE MAINTEN...

Страница 2: ...e methylene chloride may be used with these solvents However Materials and 1 1 1 Trichloroethane are aluminum is widely used in other spray not chemically compatible with application equipment such as...

Страница 3: ...to a surface Air and material enter the gun through separate passages and are mixed at the air cap in a controlled pattern Air spray guns may be classified in various ways Two ways of classifying gun...

Страница 4: ...ically higher transfer efficiency the amount of material that is actually applied to the part than higher pressure spray systems Spray a horizontal test pattern air cap horns in a vertical position Ho...

Страница 5: ...un Set the fluid flow rate by adjusting the air pressure in the mate rial container Use about 6 psi for a remote cup and about 15 psi for a 2 gallon or larger container Adjust the fluid flow in the fo...

Страница 6: ...at aconstantspeedwhiletriggeringsincethematerial flows at a constant rate Another technique of triggering is referred to as feathering Featheringallowstheoperatortolimit fluid flow by applying only pa...

Страница 7: ...Data Sheet is available from DeVilbiss upon request Figure 14 Using a Hose Cleaner Empty the cup and wash it with clean solvent and a clean cloth Clean off the outside of the tube Fill halfway with cl...

Страница 8: ...r 3 Checkfordriedpaintjustinsidetheopening Removepaintbywashingwith solvent Heavy center pattern Fluid pressure too high for atomization Balance air and fluid pressure air pressure feed Increase spray...

Страница 9: ...ir cap Change to proper suction feed air and tip used with suction feed cap and tip Fluid pressure too low with internal Increase fluid pressure at tank mix cap and pressure tank Fluid needle adjustin...

Страница 10: ...rayhead MBC guns only wooden mallet Retighten lock bolt Runs and sags Too much material flow Adjust gun or reduce fluid pressure Material too thin Mix properly or apply light coats Gun tilted on an an...

Страница 11: ...Guns ConventionalairsprayandHVLP Standard size midsize manualandautomatic Waterbornecompatible stainlesssteelpassages Shadingandtouch upgunsforprecisioncontrol Decorativegunsfortexturedfinish Dustergu...

Страница 12: ...les Customer Service Office Address Telephone No GLENDALE HEIGHTS IL 60139 195 Internationale Blvd 630 237 5000 Toll Free Fax No 1 877 790 6965 AUTOMOTIVE REFINISHING DeVilbiss has authorized distribu...

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