Definitions for

**"Rangeability"**The ratio between the maximum and minimum capacity of the regulator at which it will continue to operate satisfactorily.

Describes the relationship between range and the minimum quantity that can be measured. Installed rangeability may be defined as the ratio of maximum to minimum flow that within which limits the deviation from a desired flow characteristic does not exceed some stated limit.

also called turndown, the ratio between the minimum and maximum flow rate for the linear flow range.