Classification of basic processing equipment for compressed air quality management and control in pneumatic systems. Air filters remove moisture, oil, and dust from compressed air, regulators are pressure control valves that supply appropriate pressure to downstream equipment, and lubricators are oil supply devices that provide lubricating oil in mist form to pneumatic equipment. These include individual units as well as integrated FRL (Filter-Regulator-Lubricator) units. Essential for supplying clean and stable compressed air to pneumatic drive components in machine tools, automation equipment, press machinery, etc., and are clearly distinguished from drive devices such as pneumatic cylinders and air motors, and control devices such as solenoid valves.