Actuator is mainly used to control the automatic regulation system in the industrial process. It is generally divided into three types: scotch yoke pneumatic actuator, electric actuator and hydraulic actuator. Today, Ruito's small edition will show you the advantages and disadvantages of these three kinds of actuators.
scotch yoke pneumatic actuator:
Nowadays, most of the actuators used in chemical industry are pneumatic actuators, which use pneumatic source as power. Pneumatic actuators are easier to operate and calibrate than other types of actuators, and can easily realize the exchange of positive and negative in the field. Its greatest advantage is that safety has explosion-proof function. When using locator, it is very ideal for flammable and explosive environment, and if the telecommunication signal is not explosion-proof or intrinsically safe, it has potential fire risk caused by fire. In contrast, it is more economical and economical than electric and hydraulic systems, and has simple structure, easy to master and maintain.
Main shortcomings of pneumatic actuators:
That is, the response is slow, the control precision is low, and the anti-deviation ability is poor. The pneumatic actuator is the best choice in the condition of not requiring high control precision, extremely fast response and anti-deviation ability.

Pneumatic actuator, i. e. cylinder, can be divided into single-action and double-action cylinders. When the air source is cut off, the cylinder can not return to the preset position. Single-acting pneumatic actuator can return to the preset position by spring after air source is cut off.

Advantages of electric actuators:
Electric actuator is a kind of driving device which can control the direct or angular motion of valve body. Using alternating or direct current as driving energy, accepting the control signal of industrial automation control system to control the opening of the valve. The electric actuator replaces manual operation and improves the efficiency and reliability of industrial automation production. It saves a lot of labor costs and operation costs, and is easy and convenient. The control precision of electric actuator is higher than that of pneumatic actuator. If the servo amplifier is used, the positive and negative interactions can be easily exchanged, and the valve position of the cut-off signal can be easily set (keep/turn-on/turn-off).
Disadvantages of electric actuators:
Mainly have: the structure is more complex, easy to break down, and because of its complexity, the technical requirements for field maintenance personnel are relatively higher; motor operation to generate heat, if the regulation is too frequent, easy to cause motor overheating, thermal protection, but also will increase the wear and tear of deceleration gear; the other is running slower, from the regulator output a signal, to the regulation. It takes a long time for the throttle to move to the corresponding position in response, which is inferior to the pneumatic and hydraulic actuators.
Advantages of hydraulic actuators:
The anti-deviation ability is very good, which can not be achieved by the electric actuator. The output thrust or moment is basically constant, which can overcome the unbalanced force of the medium and achieve the accurate control of the process parameters. The maximum thrust generated by the actuator can be as high as 225 000 kgf. Only the hydraulic actuator can achieve such a large thrust, but the cost of the hydraulic actuator is much higher than that of the electric actuator. It is ideal for remote areas where gas pressure cannot be provided but the position of the spool needs to be precisely controlled.
After reading the above introduction, I believe that you should have a clear understanding of the difference between the scotch yoke pneumatic actuator and the other two. If you want to know more about the scotch yoke pneumatic actuator, you are welcome to visit Ruito's official website or call for consultation.