Piston

The piston is a precision-machined cylindrical component that reciprocates within the cylinder bore of a pneumatic actuator. It converts pneumatic energy into mechanical motion by responding to differential pressure across its surfaces. The piston forms a sliding seal with the cylinder wall via piston rings or seals, preventing gas leakage while allowing smooth linear movement. Its design includes features for rod attachment, seal grooves, and sometimes cushioning mechanisms to control end-of-stroke impact.

The piston operates on the principle of pressure differential. When compressed air enters one side of the cylinder, it creates higher pressure on that side of the piston face. This pressure differential generates a net force (Force = Pressure × Area) that pushes the piston toward the lower pressure side. The piston transfers this force through the piston rod to perform mechanical work such as pushing, pulling, lifting, or clamping. The direction of movement is controlled by alternating which side of the piston receives compressed air.