Operation
10 308647T
Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Engage trigger lock.
2. Shut off the pump by closing the bleed-type master
air valve (B).
3. Disengage the trigger lock.
4. Hold a metal part of the gun firmly to a grounded
metal pail. Trigger the gun to relieve pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves (D and P) and back
pressure valves (K) in the system, having a waste
container ready to catch drainage. Leave drain
valves open until you are ready to spray again.
7. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved:
a. VERY SLOWLY loosen the tip guard retaining
nut or the hose end coupling to relieve pressure
gradually.
b. Loosen the nut or the coupling completely.
c. Clear the obstruction in the hose or tip.
Adjusting the System Pressure
NOTES:
• The fluid pressure regulator controls pressure
downstream from its outlet.
• If you are using an accessory fluid pressure gauge
(H in Fig. 1), relieve the spray gun line pressure after
you reduce the regulator pressure to ensure a
correct gauge reading.
1. Make a note of the proper way to adjust pressure,
from the following descriptions:
• On a spring-operated regulator, turn the
adjusting screw (10) counterclockwise to
decrease pressure and clockwise to increase
pressure to the spray gun or extruder gun.
• On an air-operated regulator, increase supply
air pressure to increase fluid pressure.
Decrease supply air pressure to decrease fluid
pressure. Supply air up to 100 psi (0.7 MPa, 7
bar). See the chart on page 22 for the air versus
fluid pressure.
NOTE: Air-operated regulator Models 238893 and
238894 are provided with an air supply regulator
(31) to control the fluid set pressure. For increased
sensitivity in pressure set point performance, an
alternative air regulator, such as Part 206197, may
be used. This alternative air regulator uses a
sensitive diaphragm design to maintain a higher,
more accurate air pressure setting.
This equipment stays pressurized until pressure is
manually relieved. To prevent serious injury from
pressurized fluid, such as skin injection, and
splashing fluids, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
NOTICE
• The new system must be cleaned and tested
thoroughly before admitting fluid to the regulator to
avoid contaminants clogging or damaging the
regulator.
• Always use the lowest possible air and fluid
pressures for your application. High pressures can
cause premature spray tip, regulator, and pump
wear.
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