Operation; Pressure Relief Procedure - Graco DM-22 Manual

Operation

Operation

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid, and moving parts, follow the Pressure Relief
Procedure when you stop dispensing and before
cleaning, checking, or servicing the equipment.
1. Lock the dispense device trigger being used with
the DM-22 supply system.
2. Disconnect the main air line from the machine.
3. Set the Ram Director Switch (AP) to the "down"
position. The ram will gradually drop.
4. Quickly move the Ram Director Switch (AP) up and
down to bleed air from the ram cylinder when the
ram is dropping down.
Ram Director
Switch
Ram Air
Pressure Gauge
F . 6: Pressure Relief Components
IG
12
Main Air Line
Inlet Fitting
Bleed-Type Master
Air Switch
5. Set the Bleed-type Master Air Switch (AC) to the
'OFF' position. The air in the air motor should be
relieved.
6. Unlock the dispensing device trigger.
7. Hold a metal part of the gun/valve firmly to the side
of a grounded pail. Trigger the dispensing device to
relieve pressure.
8. Lock the dispensing device trigger.
9. Open the Pump Bleeder Valve (AD).
10. Leave the Pump Bleeder Valve (AD) open until
ready to dispense again.
F . 7: Open Valves
IG
If you suspect the spray tip/nozzle or hose is completely
clogged or pressure has not been fully relieved, proceed
as follows:
11. Ready container to catch drainage. Then, slowly
open the Pump Bleeder Valve (AD).
12. Slowly loosen the hose end coupling to gradually
relieve pressure, then loosen it completely to empty
tip/nozzle or hose.
13. Clear the tip/nozzle or hose.
Pump Bleeder Valve
3A7931B