Pressure Relief Procedure - Graco PCF Instructions Manual

Pressure Relief Procedure

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 Pro-
cedure when you stop spraying and before cleaning,
checking, or servicing the equipment.
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
the fluid flow stops.
5. If the dispense valve 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 to
open all dispense valves attached to this fluid
plate and relieve fluid pressure. See F
Dispense Valve Air Solenoid
F . 32: Dispense Valve Air Solenoid
IG
3A2098A
until
. 32 and perform the fol-
IG
. 32.
IG
b. Continue actuating the plunger until all pressure
is purged from the system between the needle
and the dispense valves attached to this fluid
plate before proceeding to the next step.
6. For systems with multiple fluid plates, repeat previ-
ous steps for other fluid plates.
7. Shut off air to the fluid plate.
8. Turn main power switch on control panel to the OFF
position.
If you have followed the previous steps 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 continue relieving
pressure.
If this does not remove the obstruction, very slowly
loosen the hose end coupling and relieve pressure grad-
ually, then loosen the coupling completely. Clear the
valves or hose. Do not pressurize the system until the
blockage is cleared.
Pressure Relief Procedure
49