| 摘要 |
<p>A protective ring for use in a coupling assembly (100), the coupling assembly comprising a coupling body (120) of generally cylindrical shape with a channel therethrough, each end of said coupling body (120) having a thread for threaded mating with a tubular (132,134) so that the coupling assembly (100) may provide a connection between two tubulars (132,134), the protective ring comprising a ring body (140) for positioning adjacent an interior wall of said coupling body (120) between the two ends thereof and located for contact by said two tubulars (132,134), said ring body (140) being generally cylindrical and having a ring channel therethrough, characterised in that said protective ring comprises at least one concave area, extending around at least a part of the circumference of said ring body (140) and at least one opening (144b) therein.</p> |
