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1
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5
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Manual Screw Valve DV-5005DFS /-L
The DV-5000DFS dispenses fluid with a positive displacement action using a rotary feed
screw principle. Fluid material is held in a feed reservoir (1), see Figure 2, under a positive
head of air, between 1 to 20 psi (depending upon the viscosity of the material). This
positive air pressure, supplied by the air line (2), forces the fluid material out of the barrel
into the feed screw chamber (3) material flow from this point, to the dispense tip (4), is
controlled by the feed screw rotation in the feed direction. The feed screw is driven by
the motor. Applying a DC voltage signal to the motor (5), will rotate the feed screw and
the fluid will be forced out of the dispensing tip.
Shearing of the material is achieved by reverse Z-motion (tip retraction). When the mo-
tor stops, the unit remains in position for a fraction of a second (dwell) to allow the last
of the material to flow out of the dispensing tip. After the dwell period, the automation
equipment moves the DV-5000DFS Valve to the next position.
5 Operating principle
Fig. 2
VIEWEG
