Specialized valves for controlling compressed air flow in pneumatic systems. Includes directional control valves, flow control valves, pressure control valves, solenoid valves, and manual valves for operation control, pressure regulation, and flow adjustment of pneumatic cylinders and actuators. Used in manufacturing line automation equipment, robot control, and conveying systems as core control components of pneumatic circuits. Clearly distinguished from hydraulic valves, designed with structures and materials specifically for compressed air applications.