1. B series pneumatic actuator power module is equipped with internal bars, do guide for the piston in the cylinder wall, and thus reduces the piston head bearing and the requirement of the metal coating, the application of this characteristic makes the lining coating, the application of this characteristic makes the lining coating, this coating has a strong anti corrosion performance, and have ecellent lubricating properties, so as to improve the efficiency of the actuator, and reduce the wear of piston seal, equipped with external tension lever actuators are more vulnerable to premature corrosion problems, this is due to the equipment after paint on the pull rod and the piston wall, the gaps between the end cover is not easy to detect with the naked eye, but also more sensitive to mechanical damage.