Classification of mechanical equipment and related devices that operate using compressed air as a power source. Includes pneumatic system components such as air cylinders, pneumatic valves, air motors, pneumatic fittings, air filters, regulators, and lubricators. Used in manufacturing line automation, conveyor systems, clamping devices, and positioning mechanisms, offering superior explosion-proof performance, high-speed operation, and maintainability compared to electric equipment. Clearly distinguished from hydraulic equipment by power medium (air vs oil) and differentiated from electric actuators by drive method.