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Selection Charts
Selection Charts
TERMS
Light Fluid: Up to 18 seconds with No. 2 Zahn
cup (20 centipoise)
Medium Fluid:19 to 28 seconds with No. 2
Zahn cup (20-64 centipoise)
Heavy Fluid: Greater than 28 seconds with
No. 2 Zahn cup (greater than 64 centipoise) --
2.8 Volatile Organic Compounds, High-solid
Polyurethanes, Heavy Waterborne Enamels
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. See the Air Cap
chart, page 11, for maximum inlet pressure.
LVMP Guns
An LVMP gun is a high transfer efficiency gun
that has been tested to have a transfer effi-
ciency greater than or equal to HVLP guns. In
addition, the LVMP air cap consumes much
less air than the HVLP air cap. Graco LVMP
guns have no restrictions on air cap pressures.
Conventional Guns
A conventional gun has excellent atomization
and high production rates typically with some
reduction in transfer efficiency.
HiTEch Guns
A HiTEch gun is a high transfer efficiency gun
with excellent atomization. Graco HiTEch guns
have no restrictions on air cap pressures.
8
Proper Needle/Nozzle Selection
The spray gun's needle/nozzle kits range in
size to provide different fluid flow rates. As a
general guideline, use the fluid nozzle that will
give the required flow with the needle fully trig-
gered at a fluid pressure of 5–20 psi
(0.035–0.14 MPa, 0.35–1.4 bar).
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 abrasive fluids, the gun models with
•
tungsten carbide needle tip and nozzle are
recommended.
Orifice Size
in.
mm
Viscosity
0.020
0.5
light
0.028
0.7
light
0.035
0.9
light-medium
0.039
1.0
light-medium
0.043
1.1
light-medium
0.051
1.3
medium
0.059
1.5
medium
Flow
oz/min
cc/min
0.2-1.7
5-50
0.3-3.4
10-100
0.5-5.1
15-150
0.7-6.8
20-200
0.8-8.5
25-250
1.2-11.8
35-350
1.5-15.2
45-450
313869K
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