piston ring

This seal is usually provided by one or more piston rings.

At one time, it was the nation's largest manufacturer of piston rings.

Gas sealing is achieved by the use of piston rings.

Piston rings are not perfect seals; in fact, each has a gap to allow for expansion.

There are many proprietary and detail design features associated with piston rings.

Increasingly, Sun's customers, mostly corporations, do indeed think of computers as if they were piston rings.

The piston rings are supplied with oil from a small supply hole in the cylinder wall at bottom dead center.

The pistons and top piston rings were also upgraded to 1.2 mm.

He welded a piston ring about each can, after building up the inside with silver plating.

The following morning, it was discovered that four of the engine's cylinders also had cracked piston rings.