A control valve is a vital component in various industrial processes, used to regulate the flow of fluids, such as gases, liquids, or slurries, by varying the size of the flow passage. Essentially, it adjusts the flow based on the signals received from a controller, ensuring that the process variables — such as pressure, temperature, level, and flow rate — remain within the desired range.

Control valves are integral to systems where precise control of process parameters is crucial. They are found in industries like oil and gas, chemical manufacturing, water treatment, power generation, and HVAC (heating, ventilation, and air conditioning).