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This invention concerns a multi-layered cylinder-head gasket. An intermediate layer has a variable cross-section around the circumference of the cylinder bores, and may include slits shaped in a circular arc. This helps to optimise the contact pressure of the gasket and reduce bending of the interme
This patent describes a design of butt joint for pistons rings which from the description are used as shaft seals. The rings have a stepped butt joint and one half of the joint has a surface that slopes in the circumferential direction and is engaged by the opposing half of the ring.
## Tenaris Connections AG, Switzerland A further variation of the threaded joint for oil and gas pipes is described. It creates a metalto-metal seal externally to the female thread. The joint has an extension of the box beyond the seal, which produces an elastic tightening band effect on the seal