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Pressure Relief Procedure
This procedure describes how to relieve pressure for
the supply unit. Use this procedure whenever you shut
off the dispenser/sprayer and before checking or
adjusting any part of the system, to reduce the risk of
serious injury.
WARNING
MOVING PARTS HAZARD
Follow this Pressure Relief Procedure
before checking or repairing the ram or
any other part of the system, and when
shutting down the system. Keep hands and fingers
away from the follower plate, fluid pump inlet, and
lip of the fluid container when raising or lowering
the ram to reduce the risk of pinching or amputat-
ing hands or fingers.
During operation, also keep hands and fingers
away from limit switches to reduce the risk of
pinching or amputating hands or fingers.
SKIN 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
whenever you:
D are instructed to relieve the pressure
D stop spraying/dispensing
D install or clean the spray tip/nozzle
D check or service any of the system equipment
PRESSURIZED FLUID HAZARD
Do not operate the 80:1 Premier above 5
bar (73 psi) air pressure. The CM1000
lower is rated to 403 bar (5850 psi)
Maximum Fluid Working Pressure. The pump
supply unit is equipped with a pressure relief valve
to prevent the user from operating the pump air
pressure regulator above the recommended 5 bar
(73 psi). For further technical assistance, contact
your Graco distributor.
Operation
1. Lock the gun/valve trigger safety.
2. Shut off the main air supply to the pump.
3. Close all air bleed valves.
4. Unlock the gun/valve trigger safety.
5. Hold a metal part of the gun/valve firmly to the side
of a grounded metal drum, and trigger the gun/
valve to relieve pressure.
6. Lock the gun/valve trigger safety.
7. Have a container ready to catch the drainage, then
open the drain valve or pump bleed valve.
8. Leave the drain valve open until you are ready to
spray/dispense again.
NOTE: If you suspect that the spray tip/nozzle or hose
is completely clogged, or that pressure has not been
fully relieved after following the steps above, very
slowly loosen the tip guard retaining nut or hose end
coupling to relieve pressure gradually, then loosen
completely. Then clear the tip/nozzle or hose.
9. If you want to relieve pressure in the ram, see the
Ram Pressure Relief Procedure on page 18.
310524
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