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ABB NPBA-12 Board New Item NPBA12
Because a single extraction and/or admission turbine has only two control
valves, only two parameters at a time can be controlled. Due to a turbine’s
design, the positioning of either valve (HP or LP) has an effect on both
parameters being controlled. This interaction between valves (controlled
parameters), can cause undesirable fluctuations in a process not requiring a
change.
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