Honeywell HercuLine 10260A - Proportional Flow Using Multiple Actuators; Figure 6-3 Proportional Flow Using Multiple Actuators

Other Control Functions
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6.2.2 Proportional Flow using Multiple Actuators
The controller governs flow rate in one burner. Only that flow is measured. Since #2 and #3 motor
positioners receive the same signal as #1 motor positioner, valves #2 and #3 will deliver the same amount
of fuel. This is true when the span and zero adjustment are all set the same as in curve 2 of the graph.
Other relationships between units exist if the span adjustment (3) for ratio or if the zero adjustment is
changed (1) for bias.
Figure 6-3 Proportional Flow Using Multiple Actuators