Graco 332097A Manual de usuario descargar pdf (Pagina 7)

WARNING: Do not apply either operating or reservoir air pressure to the product unless all screws are

in place and properly tightened, and the receiver cap and/or the reservoir are properly in place and

tightened. All air connections should be fastened securely.

Attach the air line to the regulator and set the air pressure control to 15 psi (103 kPa) or to the setting

required for the application. (Note: When using a remote reservoir, the delivery tubing and fittings must

be compatible with the material being dispensed and capable of withstanding the dispensing pressure.)

WARNING: Do not exceed 100 psi (690 kPa) pressure on the operating system or 60 psi (414 kPa)

pressure on the syringe reservoir. Higher pressures are not required and may cause a serious hazard.

WET SYSTEM CHECKOUT

Using the purge cycle on the air supply controller, run the material through the Dispense Line until a

smooth material flow comes through the Dispensing Needle.

After the purge cycle has been completed, set the air supply controller to the manual cycle mode and

cycle the Dispense Valve several times.

CLEANUP

The model 902-20 PDP Dispense Valve has been engineered for easy cleanup with needle and a

Disposable Dispense Tube.

DISPENSING NEEDLE

Remove the luer lock type dispensing needles by grasping at the base and twisting one-quarter turn

counter-clockwise. Other needles may bc held in place with a nut, which must be fully unscrewed.

Clean with water or solvent depending on the material dispensed. A fine wire, used cautiously, will

help open clogged needles. Replace if damaged or severely clogged.

WARNING: Do not try to disassemble or clean the unit while it is under pressure.

DISPENSE TUBE

Tube life is difficult to predict due to its dependence on the cycles, speed, downtime and material

dispensed.

A reduction in shot volume is a common sign of a worn Dispense Tube. Periodic inspection of the

Dispensing Tube is recommended. Replace if necessary.

To change the Dispense Tube, DO NOT disassemble the valve.

1. Depressurize the syringe or reservoir, and remove or disconnect it.

2. Pressurize the bottom Piston this is the Purge mode and remove pressure from the Top Piston. (It

may be necessary to push back the Top Piston with a small pointed tool.) The Dispense Tube will now

be completely free of compression.

3. Loosen the Upper and Lower Screw Knobs enough to allow the Dispense Tube to pass out the side

of the valve. Note: Different models have different dispense tube configurations. Removal and

replacement of the tube assembly will vary.

4. Replacement: Replace tubes only with same or equivalent tubing -tubing with different I.D. or O.D.

will change the dispense amount; tubing with different wall thickness will leak, dribble, or have

seriously shortened operating life; tubing with inferior mechanical properties will not last. Pay dose

attention to the way the old tube is installed and use this information to get the new one in properly.

• Some tubes may have luer lock fittings or mechanically similar fittings and it may be necessary to

disassemble them (removing the needle) to replace the tube.

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Graco 332097A Manual de usuario Pagina 7