Compared with pneumatic actuators, electric actuators have three main advantages: (1) no special air source and air purification devices, (2) long-distance transmission of signals, cable laying is much more convenient than air pipe and liquid pipe laying. And it is convenient for line inspection, (3) convenient and concise connection with computer, more suitable for adopting new electronic information technology; its shortcoming is that it can only remain in place under power failure.

Compared with electric actuators, pneumatic actuators mainly have 2 advantages: (1) The pneumatic components are simple in structure, easy to manufacture, easy to standardize, serialize and generalize. (2) Under the condition of power failure, double acting can maintain the original The position, single action can be reset, and in the case of a spare air source, the control can still be realized; the disadvantage is that the pneumatic system has a large exhaust noise during use (it can be considered to add a muffler).

In the course of use, we also found that the selection of the regulating valve is an important part. The working quality of the regulating valve is largely related to the processing quality of its actuator and spool, so the valve suitable for the process requirements is selected. And the actuator will have a multiplier effect. In view of our selection experience, it is recommended that high-quality valves and electric actuators are preferred under the premise of tight budget, which is reliable and easy to maintain, especially in large-scale long-term projects.