Combination gravimetric and volumetric dispenser for multiple fluids
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United States of America Patent
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Apr 5, 2011
Grant Date -
May 3, 2007
app pub date -
Dec 8, 2006
filing date -
Oct 30, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A combination gravimetric and volumetric fluid dispenser which includes a scale linked to a controller. The controller is linked to a plurality of two stage valves which control the dispensing of large quantities of base materials. The controller is also linked to a plurality of nutating pumps which together with the controller controls the dispensing of smaller quantities of additive materials. The base material dispensing valves include stepper motor actuators having multiple steps per revolution and are under the control of an analog signal from a controller. The base material dispensing valve is opened or closed via a rod that is slidably raised or lowered upon rotation of the drive shaft of the stepper motor actuator.
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