Graco 230-998 - Manual (Page 10)

10
307–636
Operation
Pressure Relief Procedure
WARNING
INJECTION HAZARD
Fluid under high pressure can be in-
jected 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
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. Lock the spray gun trigger safety.
2. Shut off the air to the pump.
3. Close the bleed-type master air valve (required in
your system).
4. Unlock the spray gun trigger safety.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the spray gun to
relieve pressure.
6. Lock the spray gun trigger safety.
7. Open the drain valve connected to the fluid filter
outlet, and all other drain valves used in the sys-
tem (such as in systems using fluid regulation), to
help relieve fliud pressure in the displacement
pump, hose, and gun. Triggering the gun to relieve
pressure may not be sufficient. Have a container
ready to catch the drainvage.
8. Leave the drain valve(s) open until you are ready
to spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
air cap or hose end coupling and relieve pressure
gradually, then loosen completely. Now clear the tip or
hose.