Liquid Flow Controller Designs
For applications where a flow rate needs to be
automatically maintained regardless of small pressure changes, flow controllers save users
time and money. A flow controller combines a needle valve and flow sensor with smart
electronics that compare the setpoint vs. actual flow and adjust the valve automatically.
By sending an analog signal to the unit, the flow rate may be adjusted
from a remote location (i.e. computer or control station). Flow rates can then be varied
and verified to adjust chemical blends, dispense amounts, or chemical usage automatically
Figure 1: Design
of 401 Valve Unit
Figure 1 illustrates the design of the Model 401, the worlds
first microprocessor-controlled flow controller made with Teflon® PTFE brand resin
for precision flow rate control. Figure 2 shows how several liquid flow controllers,
such as the Model 401, can be used together for precise mixing and blending of corrosive and pure
liquids. Higher yields result when blending and dispensing are consistently
monitored and controlled.
Precision Blending System
The Model 400/470 package is well suited for laboratory, non-corrosive applications. The Model 401
is designed for corrosive applications such as acid dilution, water treatment, cleaning
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