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Valve Positioner

Position controller mechanically connected to a moving part of a valve or
its actuator, and automatically adjusts its output pressure to the actuator to
maintain a position that bears a predetermined relationship to the input signal.

Variable, Measured

Process condition (such as temperature or pressure) selected to represent
state of material being made or processed.

Velocity

The rate at which the position of a moving object is changing. Velocity has
two characteristics: magnitude (speed) and direction. The rate of change of
displacement; dx/dt.

Volt

Unit of potential difference such that the potential difference across a
conductor is 1 volt when 1 ampere of current in it dissipates 1 watt of power.

Volt Amperes (VA)

A measurement of apparent power. The product of voltage
and current in a reactive circuit. V (voltage) x I (current)
= VA.

Voltage (V)

The difference in electrical potential between two
points in a circuit. It's the push or pressure behind
current flow through a circuit. One volt (V) is the
difference in potential required to move one coulomb of
charge between two points in a circuit, consuming one joule
of energy. In other words, one volt (V) is equal to one
ampere of current (I) flowing through one ohm of resistance
(R), or V = IR.

Voltage Drop (VD)

This value indicates the maximum voltage drop measured
across the conducting output. Sometimes referred to as
Saturation Voltage. In any solid state control that switches
a load, there will be some voltage dropped across the
output. This voltage drop or saturation voltage will often
vary with the amount of current going through the output
section and the load. It should be specified with current
conditions. Units = Volts (DC) or Volts RMS (AC).

Voltage Supply Range (+VS)

Maximum ripple 10 % of VS. The supply voltage should not
be higher or lower than the indicated maximum or minimum
values.

Voltage-to-Frequency Converter

A device that converts an analog input voltage into a sequence of digital
pulses with a frequency that is proportional to the input voltage.

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