The pneumatic actuator that converts the pressure energy of compressed gas into mechanical and energy in pneumatic transmission. There are two types of cylinders: Reciprocating Linear Motion and reciprocating swing. Do Reciprocating Linear motion of the cylinder can be divided into single-acting cylinder, double-acting cylinder, diaphragm cylinder and impact Cylinder 4. 1 SINGLE-ACTING CYLINDER: There is only one end of the Piston Rod, from the Piston side to supply gas gathering can produce air pressure, air pressure to push the piston to produce thrust out, by spring or self-re-entry. 2 DOUBLE-ACTING CYLINDERS: Alternate Air Supply from both sides of the Piston, and output force in one or two directions. 3 DIAPHRAGM TYPE CYLINDER: replace the Piston with Diaphragm, only in one direction output force, with Spring Reset. It has a good seal, but a short stroke. 4 IMPACT CYLINDER: This is a new type of component. It converts the pressure energy of the compressed gas into the kinetic energy of the Piston's high-speed 10-20 m / s motion, thereby doing work. 5 RODLESS CYLINDER: The general term for a cylinder without a Piston Rod. There are magnetic cylinder, cable cylinder two categories. Do reciprocating swing cylinder said swing cylinder, by the blade will be divided into two chambers, alternate air supply to the two chambers, the output Shaft Swing Movement, Swing Angle less than 280. In addition, there are rotary cylinder, pneumatic-hydraulic damping cylinder and step cylinder, and so on.