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The single-acting fork-shifting actuator is a piston-type actuator which only has the opening action is driven by the air source, and the closing action is a spring return, apply to 90 ° angle of the valve (such as ball valve, butterfly valve, plug valve) switch off or metering control. The piston is driven in a straight line by the Compressed air entering the cylinder. The piston is designed to turn the straight movement of the piston into the rotation of the fork by the piston pin and the U-shaped groove of the fork. The rotation of the fork drives the output shaft to rotate, thus, the valve is controlled by the fork-shifting actuator.