The operation of a pneumatic double-acting cylinder. - Leaving Cert Engineering - Question v) - 2015

A pneumatic double-acting cylinder operates by using compressed air to move its piston in both directions. When air pressure is applied to one side of the piston, it pushes the piston out, extending the cylinder. This extension will occur as long as the air supply is active and pressure is maintained.

Once the first position is reached, the cylinder will remain in that position even if the air supply is turned off. This indicates that the cylinder is capable of holding its load without continuous air pressure, a crucial feature for many applications.

To return the piston to its original position, air must be directed to the opposite side of the piston. This change in air supply allows for controlled movement and the ability to repeat the cycle of extension and retraction as needed.