An adjustable valve, also known as a control valve, is the final control element in the field of industrial automation process control. It receives control signals from the regulating control unit, operates using power to alter process parameters such as medium flow, pressure, temperature, and level. Typically, it consists of an actuator and a valve. Depending on the stroke characteristics, adjustable valves can be categorized into straight stroke and angular stroke types; and based on their functions and characteristics, they are classified into three types: linear, equal percentage, and parabolic. These valves are suitable for mediums such as air, water, steam, various corrosive substances, sludge, and oils. As a widely used type of final control element, adjustable valves play a crucial role in the automatic control of modern factories.