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It is the chief executive element of pneumatic transmission, on the basic structure is divided into single acting and double acting type two kinds. Compressed air from one side of the former into the cylinder, the piston to move forward, on the other end of the spring force or weight of the piston back to its original position; The latter the reciprocating movement of the cylinder piston is driven by compressed air. After the cylinder by the front end cover, end cover, the piston and cylinder, piston rod, cylinder, etc