= Single- and double-acting cylinders
{wiki=Single-_and_double-acting_cylinders}
Single-acting and double-acting cylinders are two types of actuators used primarily in hydraulic and pneumatic systems for converting fluid pressure into linear motion. \#\#\# Single-Acting Cylinders - **Definition**: A single-acting cylinder can exert force in one direction only. It uses fluid power to extend the piston, and a spring (or gravity) typically returns the piston to its original position.
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