Classification of pneumatic control valves

The pneumatic control valve is a kind of pneumatic components which can control the pressure, flow rate and flow direction of the air flow in the pneumatic system and ensure the pneumatic actuator or mechanism to work normally. 

The components that control and regulate Compressed air pressure are called pressure control valves. The components that control and regulate the flow of the Compressed air are called flow control valves. The components that change and control the direction of airflow are called Directional control valves. In addition to the three types of control valves mentioned above, there are logic elements which can realize certain logic functions, including the jet elements without moving parts and the pneumatic logic elements with moving parts. In the structure principle, the logic element is basically the same as the direction control valve, but the volume and the diameter are smaller, generally used to achieve the signal logic function. In recent years, with the miniaturization of pneumatic components and the application of PLC control in pneumatic system, the application range of pneumatic logic components is gradually reduced. From the point of control mode, pneumatic control can be divided into intermittent control and continuous control. In the intermittent control system, the pressure control valve, the flow control valve and the direction control valve are usually used to realize the program action. In the continuous control system, in addition to the pressure and flow control valves, Servo and proportional control valves are also used, for continuous control of the system.