Which schematic symbol depicts energy conversion devices, such as an air motor, in a pneumatic schematic?

• A. Circle
• B. Diamond
• C. Triangle
• D. Square

Answer: (A)

Energy conversion devices are the parts of a pneumatic system that turn compressed air into motion or power, like an air motor. In pneumatic schematics, these devices are drawn as a circle, signaling their role as energy processors. The circle distinguishes them from other elements such as actuators or valves, which use different shapes to show their distinct functions. So a circle is the symbol you’d expect for an energy conversion device like an air motor.