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Variable Speed Drives, 4th Edition by David William Spitzer

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Alternate Final Control Elements

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Final control elements other than control valves have many appropriate applications throughout industry, which in some applications compete with control valve technology. Alternate final control element technologies often offer superior performance with reduced installed, operating, and maintenance costs. The applicability of alternate final control elements should be based upon process requirements, reliability, and economics.

Alternate final control elements fall into one of two general categories: variable capacity, where control is integrated into mechanical equipment, and variable speed drives, where the speed of the rotating equipment is varied. Both technologies have evolved over the course of time and ...

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