What is the primary function of a Digital Valve Controller (DVC)?

• A. It is attached to the valve actuator and controls and monitors the valve position.
• B. It stores calibration data.
• C. It powers auxiliary instrumentation.
• D. It controls temperature in the loop.

Answer: (A)

A Digital Valve Controller is centered on managing the valve’s position by sitting on the valve actuator and turning control signals into motion while continuously monitoring where the valve actually sits. It receives a position setpoint from the process control system, drives the actuator to reach that position, and uses feedback from a position sensor to verify and adjust as needed. This closed‑loop control ensures accurate, repeatable valve positioning, which is essential for precise flow control and safety in the process.

Extras like storing calibration data or powering other instruments can be features of such a device, but they are not its primary role. Temperature control in the loop is handled by other parts of the control system, not the main function of the valve controller.