Valve Terms

Rangeability:

The ratio of the largest flow coefficient (Cv) to the smallest flow coefficient (Cv) within which the deviation from the specified inherent flow characteristic does not exceed the stated limits.

Hysteresis:

The maximum difference in output value for any single input value during a calibration cycle, excluding errors due to dead band.

Capacity:

The rate of flow through a valve under stated conditions.

Linearity:

The flow rate of valve varies linearly with valve plug lift.

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