Pressure Relief Procedure - Graco PCF Instructions - Parts Manual

Pressure Relief Procedure

Pressure Relief Procedure
1. Shut off the fluid supply to the fluid plate assembly.
2. Place a waste container beneath the fluid drain
valve under the filter. Place a waste container
beneath the dispense valve.
3. Slowly open the drain valve at each fluid filter to
relieve fluid pressure. Close valve when pressure
gauge reads zero.
4. In maintenance mode, select Full Open Dispense
Mode, which opens the regulator and dispense
valve. Press the manual dispense button
until the fluid flow stops.
5. 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 the dispense valve before proceeding to the
next step.
6. Shut off power and air to the fluid supply system.
46
. 29 and perform the fol-
IG
. 29.
IG
Dispense Valve Air Solenoid
F . 29: Dispense Valve Air Solenoid
IG
If you have followed the previous and still suspect that
a valve, hose, or dispense nozzle is clogged or that
pressure has not been fully relieved, very slowly
remove the dispense tip, clean the orifice, and con-
tinue relieving pressure.
If this does not remove the obstruction, very slowly
loosen the hose end coupling and relieve pressure
gradually, then loosen the coupling completely. Clear
the valves or hose. Do not pressurize the system until
the blockage is cleared.
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