Electric actuators are mainly use in power plants or nuclear power plants. Because a smooth, stable and slow process is require in high-pressure water systems.
The main advantages of electric actuator are high stability and constant thrust that can apply by users. The thrust produce by zUI large 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 electric ones.
The anti-deviation ability of the electric actuator is very good. The output thrust or torque is basically constant. It can very well overcome the unbalance force of the medium, to achieve the accurate control of the process parameters. So the control precision is higher than the pneumatic actuator.
If equip with a servo amplifier, it is easy to realize the exchange of positive and negative effects. And it is also easy to set the status of the break signal valve (keep/fully on/fully off). But in case of failure, it must stay in the original position. Which is not possible for pneumatic actuators, pneumatic actuators must use a set of combined protection system to achieve the protection.
The disadvantages of the electric actuator are mainly as follows: the structure is more complex, more prone to failure. And because of its complexity, the technical requirements on the site maintenance personnel are relatively high. Motor operation to generate heat, if the adjustment is too frequent. It is easy to cause motor overheating, thermal protection, but also increase the wear of reduction gear.
In addition, the operation is slow, from the regulator output a signal, to the control valve response and movement to the corresponding position, it takes a long time, which is not as good as pneumatic, hydraulic actuators.