| 摘要 |
<p>1. A sealing device for a joint comprising two parallel flat faces (13, 14) comprising, on the one hand, an annular gasket (1, 101) having two parallel flat sealing faces (2, 3; 102, 103) and one internal and one external annular lateral surface (15, 16; 115, 116), which are perpendicular to said sealing faces, said gasket (1; 101) being composed of a core (4; 104) and of annular metal-based sheathing elements (5, 6; 105, 106), each having, in cross section, the form of an angle placed at a corner of the gasket (1; 101), these elements (5, 6; 105, 106) forming at least one pair of elements (5, 6) each having an annular transverse portion (18; 118) bordering the same sealing face (2; 102) of the gasket (1; 101) and an annular cylindrical portion (17; 117) of which the external surface constitutes part of the corresponding lateral surface (15; 115) of the gasket (1, 101), the device comprising, on the other hand, one or more parts (7; 110, 111) defining a cavity (12; 112) having two annular lateral surfaces (8, 9; 108, 109) which are perpendicular to said parallel flat faces (13, 14) of the jojnt, said cavity having to receive or receiving the gasket (1; 101), characterised in that, to prevent the escape of material from the core when the gasket (1; 101) is gripped between the two parallel flat faces (13, 14) and to produce the seal at temperatures ranging from -245 degrees C to +1050 degrees C and at varied pressures, with gripping of a gasket (1; 101) which can be reproduced on another gasket of the same type : - the core (4; 104) of the gasket (1; 101) is of compressed expanded graphite having a density of between 1.1 and 2.0 g/cm**3 ; - the annular sheathing elements (5, 6; 105, 106) are metallic, and the annular transverse portion (18; 118) of each element has a width of between 10 and 45% of the width (1) of the gasket (1; 101) with a minimum of at least 0.8 mm and, at the external surface, an inclination of 90 to 120 degrees to the longitudinal direction of its annular cylindrical portion (17; 117) so that the corresponding flat connecting face (14) is supported directly on the graphite sealing face (2) of the gasket (1) and escape of graphite during the gripping of the gasket is prevented ; - the annular cylindrical portions (17; 117) of said sheathing elements (5, 6; 106) have a height of between 25 and 50% of the thickness of the gasket (1; 101) in the case of elements (5, 6) of the first or single pair so that these cylindrical portions (17) will initially be encased in the cavity or groove (12; 112), and a height of between 10 and 50% in the case of the elements of a possible second pair (105; 106) ; - the thickness of the gasket (1; 101) prior to use is from 1.1 to 1.3 times the depth of the cavity or groove (12; 112), and its width is less than 0.8 mm smaller than the distance between the two annular lateral surfaces (8, 9; 108, 109) of said cavity (12; 112).</p> |
