Issue
What is difference between valve rangeability and turndown ratio?
Product Line
Field Devices
Environment
Valves
Cause
Definition of the terms helps explain the flow outcomes.
Resolution
Rangeability - maximum controllable flow divided by minimum controllable flow
Turndown ratio - normal maximum system flow divided by minimum controllable flow.
Rangeability is the inherent characteristic of the valve and turndown ratio is the installed characteristic.
