Operation
308647T 11
2. Adjust the pump air pressure and fluid regulator for
the desired spray pattern. Use the lowest possible
air and fluid pressures for your application. For
optimum performance, the inbound fluid pressure
should be at least 500 psi (3.4 MPa, 34 bar) above
the regulated fluid pressure.
NOTE: Do not exceed a 2000 psi (14 MPa, 138 bar)
pressure drop between the regulator inlet and
outlet. Excessive pressure drop will cause
premature regulator component wear.
For example: With 3500 psi (24.5 MPa, 245 bar) to
the regulator, the minimum regulated outlet
pressure would be 1500 psi (10.5 MPa, 105 bar).
3. In a circulating system, also adjust the back
pressure valve (K).
4. Record all the settings for future reference.
Cleaning the Regulator
Do not allow fluid to settle in the system.
Flush the regulator whenever the rest of the system is
flushed (see page 10). Before you flush the system,
follow the Pressure Relief Procedure on page 10,
then completely decrease the regulated fluid pressure.
See step 1 in Adjusting the System Pressure, at left.
Before you remove the regulator for thorough cleaning
and inspection, follow the Pressure Relief Procedure
on page 10. Then remove the regulator, clean it, and
inspect all parts.
Flushing Procedure
• Flush before changing colors, before fluid can dry in
the equipment, at the end of the day, before storing,
and before repairing equipment.
• Flush at the lowest pressure possible. Check
connectors for leaks and tighten as necessary.
• Flush with a fluid that is compatible with the fluid
being dispensed and the equipment wetted parts.
1. Record the pressure adjustment setting of the fluid
regulator before flushing.
2. Shut off the pump and follow the Pressure Relief
Procedure on page 10.
3. Never exceed the maximum working pressure of
the lowest rated system component. Remove the
gauge if the flushing pressure will exceed the gauge
range.
4. Open the fluid regulator fully.
a. Spring Operated Regulators Only: Open the
fluid regulator by turning the adjusting screw
(10) fully clockwise.
b. Air Operated Regulator Only: In
crease the air
regulator setting to fully open the fluid
regulator. You will have to reset the fluid
regulator’s pressure setting after flushing.
5. Supply solvent to the system. Set pump to the
lowest possible pressure, and start pump.
6. Flush until thoroughly clean.
7. Adjust the fluid regulator to the desired setting.
a. Spring Operated Regulators Only: Turn the
adjustment screw (10) counterclockwise to
return to the desired pressure setting.
b. Air Operated Regulator Only: Adjust the air
regulator to return to the desired fluid pressure
setting.
To avoid fire and explosion, always ground
equipment and waste container. To avoid static
sparking and injury from splashing, always flush at
the lowest possible pressure.
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