| 摘要 |
1. An annular static and/or dynamic seal intended to establish fluid-tightness between a valve body (37) a spherical plug (39) and optionally a flange (38) at temperature as high as 1000 degrees C, said seal (29) comprising a profiled core (30) covered in part only by an annular metal sheathing, characterized in that the profiled core (30) is made of compressed expanded graphite and in that the metal sheathing consists of at least two annular sheathing elements (31, 32, 33) the cross sections of which are of corner shape and which are separated by at least two zones (34, 35, 36) in which the core (30) of compressed expanded graphite is uncovered. |
