Graco 332097A Bedienungsanleitung PDF herunterladen (Seite 4)

DESCRIPTION OF OPERATION

POSITIVE DISPLACEMENT SEQUENTIAL FUNCTION

The normal "ready" state of the system is as follows:

The dispense valve may operate with a (remote) reservoir or with a syringe (mounted with the valve).

In the ready state, the syringe or reservoir contains dispensable material. The system has been

purged, filling the Dispense Tube and needle with material. The Bottom Pinch-Off Piston is not

pressurized (forward) but is held back by the springs, closing the Dispense Tube and holding back the

dispensable material. (See "Fill" on drawing below.) The Top Pinch-Off and Dispense Pistons are not

pressurized (back).

The dispense cycle begins when the controller is activated.

The Top Pinch-Off Piston first moves forward to stop material supply and the Bottom Pinch-Off Piston

moves forward to release the Dispense Tube. (See "Dispense Delay" on Sequential Function drawing.)

The Dispense Piston then moves forward until stopped by the Micrometer Stroke Adjust. This

squeezes a precise amount of material out of the Dispense Tube. (See "Dispense" on Sequential

Function drawing.)

When the dispense cycle is complete, the spring pushes the Bottom Pinch-Off Piston back, sealing the

Dispense Tube to prevent material drip. Immediately after, the Dispense Piston and Top Pinch-Off

Piston withdraw allowing the material from the pressurized reservoir to refill the Dispense Tube. The

system is again, in the normal "ready" state.

FILL

DISPENSE

DELAY

DISPENSE

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Graco 332097A Bedienungsanleitung Seite 4