Adjust Spray Pattern
Do not exceed 100 psi (0.7 MPa, 7 bar) maximum fluid and air pressure. Higher pressures can cause parts to rupture and result in serious injury.
The spray gun fluid flow is controlled by the fluid pres- sure regulator and the fluid control knob. Use the fluid pressure regulator to adjust the general fluid flow and the fluid control knob to make precise fluid flow adjust- ments.
CAUTION
Use caution when operating the fluid control valve near the closed position. The plastic needle tip may be damaged if forced too hard against the nozzle seat by the fluid control valve.
Follow these steps to establish the correct fluid flow and air flow:
1.To achieve desired flow, adjust the fluid flow using the fluid pressure regulator (L) installed in the gun fluid line. Typical industrial flow rates will vary with regulator pressures from 5 to 30 psi (34 to 210 kPa, 0.3 to 2.1 bar). If the fluid pressure is too low at the desired flow rate, install a smaller nozzle. If the fluid pressure is too high, install a larger nozzle.
For spray guns equipped with the fluid control knob, you can make flow rate changes at the spray gun. Rotate the fluid control knob clockwise to reduce the flow.
L
TI7019a
FIG. 12: Fluid Pressure Regulator
Setup
A larger fluid nozzle at a reduced fluid pressure will 
maintain the same flow rate, but the fluid stream (velocity) will slow down. When air is applied, this allows air to act on the fluid longer and improve the atomization.
2.Using the air pressure regulator (F), set the fan and atomizing air supply pressure per Table 1. Use these suggested settings as a starting point.
Table 1: Suggested Starting Settings
|
| Atomization Air |
| Fan Air (psi) | (psi) |
|
|
|
Airspray | 35 | 35 |
|
|
|
HVLP | 25 | 25 |
|
|
|
Compliant | 18 | 25 |
|
|
|
HVLP and Compliant Gun Limits
HVLP Guns: local laws may limit the maximum pressure to 10 psi (70 kPa, 0.7 bar) at the air cap for compliance. 35 psi (25 kPa, 2.5 bar) inlet air yields 10 psi (70 kPa, 0.7 bar) at the air cap. To measure pressure at the air cap, use the accessory tapped air cap. See Accessories, page 33.
Compliant Guns: the maximum inlet pressure to the manifold is 30 psi atomizing air.
311051F | 15 |
