Instrumentation & Calibration
Control Valve Signal / Travel Check
Convert a standard command signal to expected valve travel and compare measured position without confusing signal direction with the valve's fail-safe position.
Loop and positioner checks
Keep the action definition unambiguous.
Specify what increasing signal physically does to valve travel. Do not infer fail-open or fail-closed behavior from the signal direction.
Calculation basis
Signal % = (mA − 4) / 16 × 100
or (psi − 3) / 12 × 100
Increasing signal opens: Travel % = Signal %
Increasing signal closes: Travel % = 100 − Signal %
or (psi − 3) / 12 × 100
Increasing signal opens: Travel % = Signal %
Increasing signal closes: Travel % = 100 − Signal %
This is a signal/travel verification tool, not a valve sizing or fail-action calculator. It assumes linear command-to-travel mapping and excludes split range, custom characterization, mechanical stops, positioner calibration strategy and inherent/effective valve flow characteristic.