Control Valve Functionality: A control valve regulates fluid flow within a process system by using a positionner and an actuator, allowing for precise control based on an external control signal. Key Components: 1. Control Valve: The valve itself, which can be a globe, ball, or butterfly valve, that adjusts fluid flow based on its opening position. 2. Actuator: Converts the control signal into mechanical movement to set the valve’s position. * Pneumatic Actuator: Uses compressed air to move a di