Graco 313876F Manual de usuario descargar pdf (Pagina 27)

Operation

313876F 27

Operation

The operation of the PD44 metering valve is controlled

by an external source. If a PD44 Control Box was pur-

chased, see the PD44 Control Box manual for operation

instructions. See Related Manuals on page 3.

Sequence of Operation

Step 1: Reload

• Spools shift to the right

• Material feed inlets are opened

• Materials are transferred into the metering cham-

bers by a pressurized feed system

• Outlet ports are blocked

• Metering rods are retracted to a precise position

determining the volume of each material

Step 2: Shift

• The balanced spool assemblies shift to the dis-

pense position

• Material path to the mixer inlet is opened

• Material feed inlet ports are blocked

• Metering rods remain in the retracted position

Step 3: Dispense

• Metering rods extend

• A and B materials are simultaneously dispensed

from the metering chamber into the disposable

mixer

• A and B materials are dispensed at the predeter-

mined volume ratio.

Upon completion of the dispense stroke, the metering

rod and spool assemblies shift back to the reload posi-

tion.

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Graco 313876F Manual de usuario Pagina 27