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Pneumatic control valves are widely used in industrial enterprises such as those in the petroleum, chemical, power, and metallurgy sectors to control industrial processes. Based on the working principle of pneumatic control valves, which use compressed air as the power source and cylinders as the actuating elements, accessories such as electric valve positioners, converters, solenoid valves, and holding valves are employed to drive the valves, enabling them to open, close, or adjust proportionally in response to control signals from industrial automation systems, thereby regulating process parameters such as flow rate, pressure, and temperature of the media in the pipelines. Pneumatic control valves feature simple operation, rapid response, high safety, and do not require additional explosion-proof measures. 1. Uses and characteristics of pneumatic control valves: It features a right-angle rotary design; when used in conjunction with a valve positioner, it enables proportional control ； The V-type valve core is most suitable for various control applications, featuring a high additional flow coefficient, a large adjustable ratio, good sealing performance, flexible control functionality, a small size, and the ability to be installed in either vertical or horizontal orientation. Suitable for controlling media such as gases, vapors, and liquids. 2. Characteristics of pneumatic control valves: They feature a right-angled rotary design, consisting of a V-shaped valve body, a pneumatic actuation unit, a positioner, and other accessories ； There is an inherent flow characteristic that is approximately in a 100:1 ratio ； It adopts a dual-bearing design, resulting in low starting torque, as well as excellent mobility and response speed ； Superior shear capability. 3. The pneumatic piston actuator uses compressed air as the power source; the movement of the piston drives the crank arm to rotate 90 degrees, thereby enabling the valve to open and close automatically. Its components include: a setting bolt, an actuator housing, a crank arm, a cylinder block, a cylinder shaft, a piston, a connecting rod, and a universal joint. 4. Operating principle of pneumatic control valves: A pneumatic control valve consists of an actuating element and a control element. The actuating element is the thrust component of the control valve; it generates a corresponding thrust based on the pressure of the control signal, thereby driving the control mechanism to operate. The valve body is a component of pneumatic control valves; it comes into direct contact with the fluid being controlled, thereby regulating the flow rate of that fluid.