How is a single-acting cylinder characterized?

A single-acting cylinder is specifically designed to exert force in one direction only, utilizing hydraulic or pneumatic pressure for that movement. This means that the force created by the cylinder is applied when the fluid enters the cylinder, causing the cylinder rod to extend. The return of the cylinder to its original position typically relies on a mechanical spring or other external forces rather than fluid pressure.

The design of a single-acting cylinder makes it suitable for applications where work is performed in one direction, while the retraction is either not needed or can be managed by other means. This characteristic differentiates it from double-acting cylinders, which can exert force in both directions by utilizing pressure on both the extend and retract strokes.