Training Guide Course No. 196514
Level 2 Maintenance, X-1000 Series Dispensing Systems 2-58 P/N 196515 (Revision A)
Information Sheet 2-7-2
DV-7000
A. Description
1. The DV-7000 is a rotary positive displacement auger valve.
2. Auger valves use a combination of air pressure on the fluid column and an
electric motor driven auger or screw to move the fluid through the needle or
dispense tip onto the part.
3. The auger valve is the most common valve choice for dispensing fluids for
dams. This is partly because of the thixotropic quality of damming fluids.
4. The auger action of the valve shear-works the fluid and lowers the viscosity
during the dispense. After dispensing, the fluid resumes the higher static
viscosity. As an example, Dexter Hysol 4451 has a static viscosity of
1,500,000 cps (centipoises) and about half that during shear working (about
750,000 cps).
B. Operation
1. The DV-7000 dispenses fluid by the controlled rotation of a rotary feed
screw.
2. Fluid is pressure fed into the valve and the feed screw.
3. Air pressure to the syringe of fluid can be configured to remain constant or
to toggle on and off with the valve motor.
4. The valve motor turns the feed screw and shears the fluid.
This shear force drives fluid down the threads and through the valve.
Fluid viscosity (resistance to flow), the size of the needle opening and the
length of the feed screw interact to create back pressure.
The balances between these forces determine the amount of fluid
dispensed.
C. Adjustments
1. You can optimize the performance of the DV-7000 by changing various
settings, such as motor speed and air pressure.
2. Software parameters can also be changed to meet your particular application
requirements.
3. Diagram Sheet 2-7-2 shows a DV-7000 mounted on an X-1000 Dispensing
System.
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