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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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