What will continue to be the majority of final control elements?

The majority of final control elements will continue to be control valves because they play a crucial role in regulating the flow of fluids within a system, whether in industrial plants or power generation facilities. Control valves are designed to manage variables like flow rate, pressure, temperature, and liquid level by adjusting the size of the flow passage as directed by a control signal.

They are essential in maintaining process variables at desired set points and can provide precise control over the conditions within a system, which is critical for ensuring operational efficiency and safety. As industries evolve, the demand for reliable and responsive control mechanisms has solidified the control valve's position as a primary component of various control strategies in process control systems.

While pneumatic actuators, electrical switches, and relay systems serve important roles in specific contexts and applications, control valves offer unique capabilities and versatility that meet the needs of a wide range of processes. This capability makes them a fundamental element that will likely retain a majority presence in process control across diverse industries.