Double-acting pneumatic cylinder that controls compressed air supply and exhaust through control valves to achieve bidirectional extension and retraction of piston rod. Core actuator used in manufacturing line automation for workpiece pushing/pulling, clamp opening/closing, and reciprocating motion of conveying devices. Unlike single-acting type, generates pneumatic driving force during both extension and retraction, enabling high-precision positioning and stable speed control. Available in various sizes with bore diameter φ16-φ320mm and stroke 25-2000mm, with mounting options including foot mount, flange mount, and trunnion mount. Used in combination with 5-port solenoid valves, speed controllers, shock absorbers, and widely adopted in press machines, assembly equipment, and conveying systems.