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An oil-free reciprocating gas compressor or vacuum pump apparatus, said apparatus comprising a cylinder and a piston arranged to reciprocate within the cylinder, said piston comprising a rider ring retained in an annular recess in the periphery of the piston, said rider ring being a non-sealing fit in the cylinder and being arranged to centre ...

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Air compressor piston ring A) Piston, guide, bearer rings and gland packing, oil scrapper rings Are utilized into oil-free air compressors B) Most of rings are made of self-lubricating materials such as

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