Valve Specification

The maximum valve capacity, rangeability, and precision requirements can be found by determining the parameters A and B from the titration curve, shown in Figure 7.40.7 for a setpoint on the flat portion and in Figure 7.40.8 for a setpoint on the steep portion of the titration curve and by inserting them into Equations 7.40.1, 7.40.2, and 7.40.3. Parameter A is the distance along the x axis from the influent pH to the setpoint. It is multiplied by the maximum influent flow for a given operating condition. The

FIG. 7.40.7 Data required for reagent control valve specification when the pH setpoint is in a flat portion of the titration
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