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Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure if the
spray tip/nozzle clogs and whenever you:
D are instructed to relieve the pressure,
D stop spraying,
D check or service any of the system equipment,
D or install or clean the spray tip.
1. Engage the dispensing valve safety latch.
2. Shut off the feed pump and proportioning pump air
regulators and bleed-type master air valves.
3. If the system has heaters, circulate the fluid for at
least 10 minutes to cool the heated fluid and
heater.
4. Disengage the dispensing valve safety latch.
5. Hold a metal part of the dispensing valve firmly to
the side of a grounded metal pail, and trigger the
dispensing valve to relieve pressure.
6. Engage the safety latch.
7. Open the mixer manifold drain valves (required in
your system), having a container ready to catch
the drainage. Close the valves immediately.
8. Use the solvent pump to flush the mixer manifold
solvent valves.
9. If you suspect that the nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, very
slowly loosen the nozzle or hose end coupling and
relieve pressure gradually, then loosen completely.
Now clear the nozzle or hose.
Operation
Handling Plural Component Fluid
toxic. See the Toxic Fluid Hazard warnings on
page 3. Read and follow the coating and solvent
manufacturer's safety precautions and warnings.
Wear the proper protective clothing, eye protection,
gloves, and clean air breathing apparatus as
prescribed by the fluid manufacturers recommen-
dations, O.S.H.A. regulations and as approved by
N.O.I.S.H. for the chemicals being used.
Observe the Pot Life Limit
Flush the mixed fluid out of the mixer, dispensing lines
and equipment before it hardens. Flush the complete
system when necessary to prevent the fluids from
hardening in the equipment and hoses. Check the fluid
manufacturer's instructions for fluid shelf life, and flush
the entire system before this time is reached. Flush the
system with a compatible solvent as explained on page
17.
Fill the Throat Packing Nuts
Keep each displacement pump throat packing nut (JJ)
filled with Graco ISO Pump Oil to help prevent fluid
from drying on the displacement rod and damaging the
pump packings. See Fig. 15.
Verify compatibility of the pump oil with the fluids being
used in the pumps. During operation very small
amounts of this fluid are dragged past the seals and
into the pump.
Fig. 15
WARNING
PLURAL COMPONENT FLUID
HAZARD
Be extremely cautious when handling
plural component materials and solvents
used with them. Some are extremely
308225
JJ
02897
19
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