| 摘要 |
The sealing elements (5) mounted between the spherical element (3) forming a plug and the body of the cock are produced from a self-lubricating material and are mounted in a groove (24a; 24b) of the body of the cock. Means (5a, 5b, 5c; 25, 26, 27) are provided in the sealing elements (5) and/or in the body of the cock in the vicinity of this groove so that, under the effect of heat which damages the self-lubricating material of the sealing elements (5), this material flows preferentially into the groove (24a; 24b) and into the chamber (4) defined by the sealing elements (5) between the spherical element (3) and the body (1), leaving the bearing surfaces (25) facing the body of the cock and the spherical element "clean" and free of residue. <IMAGE>
|
