| 摘要 |
A coupling comprising a first coupling member (10) formed from a first material and having a first seating portion (20), a second coupling member (12) formed from a second material and having a second seating portion (16), means coupling the first and second coupling members together, and a seal element (24) interposed between the first and second coupling members and seated on the first and second seating portions, the seal element being formed of a third material which, when the coupling is to be subjected to temperatures below ambient, has a higher coefficient of expansion than at least one of the said first and second materials and which, when the coupling is to be subjected to temperatures above ambient, has a lower coefficient of expansion than at least one of the said first and second materials.
|
