Which is a common type of pneumatic actuator?

A diaphragm actuator is indeed a common type of pneumatic actuator used in various applications. These actuators function based on the movement of a diaphragm, which is a flexible membrane that responds to pneumatic pressure changes to create linear motion. This mechanism allows diaphragm actuators to provide precise control and reliable performance, making them suitable for tasks such as regulating flow, controlling valve positions, and automating processes in industries where air pressure is the primary source of power.

In addition, diaphragm actuators are often favored for their simplicity, low maintenance requirements, and ability to operate in environments where electric actuators might not be viable due to hazards such as moisture or dust. Their design also allows for quick response times and ease of integration into existing systems, which enhances their utility in various applications.

Other options, while certainly related to motion control and actuation, do not fit the description of commonly referenced pneumatic actuators as directly as diaphragm actuators. For example, rotary actuators also exist within pneumatic applications but are structured differently, typically involving rotational movements rather than the linear cycling achieved by diaphragm actuators.