Piston Ring

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piston ring [′pis·tən ‚riŋ]

(design engineering)

A sealing ring fitted around a piston and extending to the cylinder wall to prevent leakage. Also known as packing ring.

Piston Ring

a split, springy metal ring installed in the groove of a piston. The piston ring presses against the cylinder wall of a reciprocating engine as a result of its own tension or under pressure from a flat, steel spring. Piston rings may be of the compression type or oil-scraper type. Compression rings seal the gap between the piston and the cylinder and conduct heat from the piston; oil-scraper rings remove excess oil from the working surface. Piston rings are usually made of high-quality gray iron. Bronze piston rings are sometimes used in pumps.

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