Patent ID: 8646751

Claim:
A metal seal for valves of the ball type, the metal seal comprising: a rigid annular body including a thickness in the longitudinal direction; and an annular lip having a slanted front surface ( 52 b ) for relative sealing contact with a surface of a ball, a radially outer part ( 52 ), and an annular groove ( 54 ) being provided axially behind the annular lip ( 52 ); wherein the radially outer part ( 52 a ) of the annular lip ( 52 ) comprises inset radial grooves ( 53 ) that extend radially on the radially outer part ( 52 a ), the inset radial grooves ( 53 ) being blind toward the slanted front surface ( 52 b ) for relative sealing contact with a surface of the ball, the annular groove ( 54 ) positioned behind the radially outer part ( 52 a ) such that the annular lip ( 52 ) elastically yields in the radial direction and elastically yields in a direction relative to a plane of contact between the annular lip ( 52 ) and the ball thereby elastically adapting to irregular deformations of the ball.