(1) Actuators are classified into pneumatic, electric and hydraulic actuators according to the driving energy used.
(2) In the form of output displacement, the actuator has two types: angle type and straight type.
(3) According to the action law, the actuator can be divided into three types: switch type, integral type and proportional type.
(4) According to the input control signal, the actuator is divided into several types, such as input air pressure signal, DC current signal, electric contact on/off signal, and pulse signal.
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