How to Choose the Actuator of the Globe Valve and Their Respective Advantages?
The advantages of electric actuators:
The electric actuator is a driving device that can control the linear or angular movement of the valve body. Use alternating current or direct current as the driving energy, accept the control signal of the industrial automation control system, and control the valve opening. The electric actuator replaces manual operation and improves the efficiency and reliability of industrial automation production. It saves a lot of labor cost and operating cost, saves trouble and is convenient. The control accuracy of electric actuators is higher than that of pneumatic actuators. If equipped with a servo amplifier, the positive and negative effects can be exchanged easily, and the signal-off valve position can be easily set.
Advantages of pneumatic actuator:
Nowadays, most of the actuators used in the chemical industry are pneumatic actuators, which use air source as power. Pneumatic actuators are easier to operate and calibrate than other types of actuators, and it is easy to exchange positive and negative left and right on site. Its biggest advantage is that it has an explosion-proof function. When using a positioner, it is ideal for flammable and explosive environments. If the electrical signal is not explosion-proof or intrinsically safe, there is a potential fire hazard due to ignition. . In contrast, it is more economical than electric and hydraulic, and has a simple structure, which is easy to master and maintain.
Advantages of hydraulic actuator:
The anti-deviation ability is very good, which is impossible for electric actuators. The output thrust or torque is basically constant, which can well overcome the unbalanced force of the medium and achieve accurate control of the process parameters. The thrust generated by the largest actuator can be as high as 225000kgf. Only hydraulic actuators can achieve such a large thrust, but the cost of hydraulic actuators is much higher than that of electric ones. It is ideal for remote areas that cannot provide air pressure but need to precisely control the position of the spool.
