Selection Charts
Proper Needle/Nozzle Selection
The spray gun's needle/nozzle kits range in size to pro- vide different fluid flow rates.
As a general guideline, use the fluid nozzle that will give the required flow with the needle fully triggered at a fluid pressure of
For low flow rates or light viscosity fluid, select the smaller nozzle sizes.
For high flow rates or high viscosity fluid, select the larger nozzle sizes.
For thicker, abrasive fluids, hardened SST needle tips and nozzles are recommended.
Gun Selection
HVLP Guns
An HVLP gun is a high transfer efficiency gun that limits the air pressure at the air cap to 10 psi (0.07 MPa, 0.7 bar) maximum. In some areas, an HVLP gun is required for compliance with environmental standards.
Compliant Guns
A compliant gun is a high transfer efficiency gun that has been tested to have a transfer efficiency greater than or equal to HVLP guns. In addition, the compliant air cap consumes much less air than the HVLP air cap.
The Graco compliant guns have no restrictions on air cap pressures, but the gun inlet pressure must remain under 30 psi (0.21 MPa, 2.1 bar) to remain in compli- ance.
Airspray Guns
An airspray gun has excellent atomization and high pro- duction rates typically with some reduction in transfer efficiency.
Air Caps
The chart below lists the air caps available for pressure feed, gravity, and siphon feed guns.
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| Typical Pattern |
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Spray Gun | Air Cap ID | in. (mm) | Gun Feed | in. (mm) | Part Number |
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HVLP | 321A | 15 (381) | Pressure Feed | 288134 | |
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HVLP | 322 | 15 (381) | Pressure Feed | .086 (2.2) | 234754† |
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HVLP | 323 | 15 (381) | Pressure Feed | .110 (2.8) | 234755† |
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Compliant | 006A | 11 (279) | All Models | 288132 | |
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Airspray | 315A | 13 (330) | Pressure Feed | 288133 | |
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Airspray | 318 | 10 (254) | Pressure Feed | .086 (2.2) | 234760† |
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Airspray | 319 | 10 (254) | Pressure Feed | .110 (2.8) | 234761† |
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Airspray | 313 | 10 (254) | Pressure Feed | 234756† | |
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Airspray | 316 | 10 (254) | Pressure Feed | 234758† | |
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*Measured with gun nozzle 8 in. (203 mm) from target surface.
† Caps do not have alignment pin feature.
8 | 311051D |
