Pneumatic cylinder is a type of device used to generate force from the energy of pressurized gas. The basic pneumatic cylinder consists of a cylindrical chamber with a movable piston and intake and exhaust channels. When compressed air or other gas is pumped into the bottom of the cylinder, the gas expands, pushing the movable piston upwards and generating force. Pneumatic cylinders, also known as air cylinders, have advantages over hydraulics in some cases and are used in a wide variety of applications. In order to operate the cylinder, a gas, such as air, must first be pressurized. This can be done using a pump. Since air usually exists at atmospheric pressure, pumps are used to force a certain volume of air into a smaller space, causing its pressure to increase to above the atmospheric level. The pressurized air stores the energy used in compressing it. When allowed to expand, this air will tend to depressurize back to its original atmospheric pressure. A pneumatic cylinder operates based on this principle. Air is compressed and then routed into the cylindrical chamber beneath a movable piston. The pressurized air exerts force against the base of the piston, causing the piston to move upward through the hollow cylinder. A rod extends from the base of the piston up through the top of the cylinder. When compressed air expands into the given space and moves the piston upwards, this rod also moves, providing a way to move other mechanical elements.
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