Graco PGM Instructions - Parts Manual page 27

8. If the dispense device cannot be actuated from the
control center, refer to F
lowing steps to open the dispense valve and relieve
fluid pressure:
a. Manually actuate the plunger on the solenoid,
that opens the dispense valve to relieve fluid
pressure. Refer to F
b. Continue actuating the plunger until all pressure
is purged from the system between the needle
and dispense valve before proceeding to the
next step.
F . 16: Dispense Valve Air Solenoid
IG
3A5185B
. 16 and perform the fol-
IG
. 16.
IG
Dispense Valve
Air Solenoid
9. If you suspect that a valve, hose, or dispense nozzle
is clogged or that pressure has not been fully
relieved:
a. Very slowly remove the dispense tip, clean the
orifice, and continue relieving pressure as
described in steps 6-8.
b. If this does not remove the obstruction, very
slowly loosen the hose end coupling to relieve
pressure gradually, then loosen the coupling
completely. Clear the valves or hose. Do not
pressurize the system until the blockage is
cleared.
10. Shut off power and air to the fluid supply system.
Pressure Relief Procedure
27