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    Piston is arranged in the cylinder and along the cylinder surface of the reciprocating motion of the disk shaped or cylindrical parts, transferring the dynamic role. In an internal combustion engine piston in gas pressure driven by external acting; in the compressor and piston pump, the fluid of the piston in the cylinder pressure and make to increase its pressure. Piston and cylinder surface sealing the piston ring to achieve. The piston rod is and the piston form one, to convey the motion of the piston to cylinder parts. The piston rod and cylinder seal generally consists of packing seal.