Graco 3A2098H important safety instructions Pressure Relief Procedure, Dispense Valve Air Solenoid

Pressure Relief Procedure

The 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 dispensing and before clean- ing, checking or servicing the equipment.

1.Shut off the fluid supply to the fluid plate assembly.

2.Place a waste container beneath the dispense valve.

3.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.

4.If the dispense valve cannot be actuated from the control center, refer to FIG. 36 and perform the fol- 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 FIG. 36.

Dispense Valve Air Solenoid

Pressure Relief Procedure

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.

5.For systems with multiple fluid plates, repeat previ- ous steps for other fluid plates.

6.Shut off air to the fluid plate.

7.Place a waste container below the air filter assem- bly then open drain valve on the air filter assembly. Close drain valve once air is relieved.

8.Turn main power switch on control panel to the OFF position.

9.If you have followed the previous steps and 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.

10.If this does not remove the clog, cover the hose end coupling with a rag then 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 block- age is cleared.

FIG. 36: Dispense Valve Air Solenoid

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