| 摘要 |
<p>An improved seal (22) for sealing across an annulus between an inner cylindrical sealing surface and an outer cylindrical sealing surface. The seal provides a body (36) and a flange (38) spaced therefrom with an annular flexible arch (42) extending between the body and the flange. The arch has a taper of its thickness so that its thinnest section is at the mid point of the arch and within its sealing area. A suitable sealing is provided to seal against the surface opposite to the surface against which the flexible annular arch seals so that there is a complete sealing across the annulus. The seal is suitable for piston rod sealing, valve stem sealing and for sealing in the annulus between two tubular well members. <IMAGE></p> |
