Tag Archive: valve rangeability

Dec
15

How to Succeed – Part 6

The increased emphasis on minimizing leakage, energy use, and low cost bid has lead to increased process variability. The valve with the lowest leakage, pressure drop, and price tag often has deadband, rangeability, resolution, and sensitivity deficiencies leading to poor control creating continual oscillations even when there are no process upsets. The sustained equal amplitude …

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Dec
08

How to Succeed – Part 5

We continue this series with some helpful hints for control system design and implementation. This week and next week we look at control valve selection. There are a lot of misconceptions from sales pitches that lack an understanding of the need for a valve to have minimum backlash and maximum resolution and sensitivity. Most of this stems …

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Jul
07

Top Ten Limitations – Turndown

Plant turndown determines how effectively a production unit can minimize inventory and energy costs. As utility rates change with supply and demand, energy efficiency changes with weather, and product demand changes with customer shipments and downstream requirements, the need to be able to run at lower and lower rates becomes increasingly important. Temporarily shutting down a …

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