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 and reliably.

Figure 1: Design of 401 Valve Unit

Figure 1 illustrates the design of the Model 401, the world’s 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.

Figure 2: 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 processes, etc.

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