Introduction to the Stroke and Control Methods of Electric Actuators

The stroke of the  electric actuator
This parameter is also a relatively important one. For rotary Electric Actuators, the stroke is fixed at 0~90 degrees. For linear actuators, the stroke unit is in millimeters and must be determined based on the valve core stroke of the control valve. The standard stroke ranges for linear Electric Actuators (electric actuators) are as follows: 10mm, 16mm, 25mm, 40mm, 60mm, and 100mm. For multi-turn electric actuators (electric actuators), the number of rotation cycles generally meets the requirements
Electrical interface
To determine the control method of an Electric Actuator, it is necessary to know what type of signal the Electric Actuator should provide as feedback.
Control method:
1. Analog control
 Typical analog control signals are 4~20mA, along with 0~10mA and 1~5V, though the latter two are less commonly used today. Most general-purpose (integrated) electric actuators can operate with analog control signals.
2. Switching Control
The general switch control signals are "on/off" command signals, and may also include a "stop" command signal. The main types of switch signals are: passive, 24V DC, and 220V AC. Typically, if a servo amplifier is used, the switch signal requirement is 220V AC. If a 220V AC switch-type electric actuator (electric actuator) is selected instead of controlling the actuator with a servo amplifier, it is essential to ensure that the provided 220V switch signal power exceeds the motor power of the actuator.
Feedback signal:
1. Analog feedback
Analog feedback signals are all valve position feedback signals output by electric actuators (electric actuators) corresponding to the current valve position. There are also 4-20mA, 0-10mA, and 1-5V types, and the latter two are rarely used now. Generally, those equipped with servo amplifiers require analog valve position feedback signals. If DCS or display instruments need to display the current valve position, it is also required that the electric actuator has an analog valve position feedback signal
2. Switch feedback signal
According to the process requirements, it may be necessary for the  electric actuator  to output a fully closed and fully open switch signal, and even other meaningful signals such as actuator fault alarm signals. Generally, switch quantities are passive, but there are also active ones.
In addition to the important parameters mentioned above, there are also some parameters that are not as important but may be very important according to process requirements, such as installation size, weight, control accuracy, full travel time, protection level, etc.