If the sensor is more than the adult feeling organ, then the actuator is equivalent to the human limbs, which accept the control signal of the regulator, changing the manipulation variable, so that the production process is performed normally according to the scheduled requirements. In the production site, the actuator directly controls the process medium. If the selection or improper use, it often brings difficulties to the automatic control of the production process. Therefore, the selection, use, and installation and commissioning of the actuator are an important issue. The actuator consists of an actuator and adjustment mechanism. The actuator refers to a device that generates thrust or displacement based on the regulator control signal, and the adjustment mechanism is a device that changes the amount of energy or material delivery based on the actuator output signal, and the most commonly adjusted valve. The actuator is divided into three major categories of pneumatic, electric and liquid according to its energy, and they have their own characteristics for different occasions. The hydraulic actuator has the greatest, and now it is generally an electromechanical, but it is more cumbersome, so it is rarely used, such as the ship valve of the Three Gorges is a liquid actuator. The actuator and adjustment mechanism of the electric actuator are separate two parts, and the actuatorial strokes and straight strokes are all position servo mechanisms that are powered by two-phase AC motor. The function is linearly transmitted. Convert to displacement. The electric actuator has a difference in safe explosion-proof performance, and the motor is not fast enough, and the motor is easily damaged when the stroke is blocked or the valve stem is taken. Although the electric actuator has been continuously improved and expanded in recent years, it is generally not possible to apply the pneumatic actuator. The actuator and adjustment mechanism of the pneumatic actuator are unified, and their actuators have two types of thin film and piston. The piston type trip is suitable for applications requiring greater thrust; while the thin film trip is small, only the valve stem can only be directly driven. Since the pneumatic actuator has the advantages of simple structure, large output thrust, smooth operation, and safe explosion, etc., there is a wide range of applications in the production process of chemical, refining, etc.. The actuator is widely used in two actuators in chemical and water supply. They control the opening degree of the internal motor drive valve by receiving the standard voltage or current signal transmitted by the controller to determine the flow rate of the liquid or gas to transmit the liquid or gas. The main differences between the two are different ways, and the rotating valve uses a rotating manner to determine the size of the valve opening, while linearly uses linear motion to complete the task. With the development of automation, electronics, and computer technology, more and more actuors have now become intelligent, many actuators have provided communications and intelligent control, such as many manufacturers' products with field bus interfaces. We believe that the actor will become more intelligent like the actor and other automation measures in the future, which is a general trend.
