Pressure Relief Procedure - Graco 236-030 Instructions-Parts List Manual

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 electric
shock, follow the Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray tip.
1. Lock the spray gun trigger safety latch. See Fig. 3.
2. Turn the ES ON-OFF lever to OFF.
3. Shut off the power to the pump.
4. Close the bleed-type master air valve (required in
system).
5. Close the air valve for the gun air supply line.
6. Unlock the gun trigger safety latch.
7. Trigger the gun into a grounded metal waste
container to relieve fluid and air pressure.
8. Lock the gun trigger safety latch again.
9. Open the pump drain valve (required in system) to
help relieve fluid pressure in the displacement
pump. In addition, open the drain valve connected
to the fluid pressure gauge (in a system with fluid
regulation) to help relieve fluid pressure in the
hose and gun. Triggering the gun to relieve pres-
sure may not be sufficient. Have a container ready
to catch the drainage.
10. Leave the drain valve(s) open until you are ready
to spray again.
11. If you suspect that the spray tip or hose is com-
pletely clogged or that pressure has not been fully
relieved after following the steps above, very
slowly loosen the hose end coupling and relieve
pressure gradually, then loosen completely. Now
clear the tip or hose obstruction.
Operation
Fig. 3
Trigger Safety
Latch Unlocked
Trigger Safety
Latch Locked
01988A