| 摘要 |
A seat coacting with the flapper of a subsurface well safety valve which includes a solid metal annular seat and an annular flexible metal seal in a recess about the solid seat. The flexible seal has a base secured in the recess and a resilient sealing lip which is generally V-shaped in cross section with one end of one of the legs of the V being connected to the base and sealing against the side of the recess and the other leg extending downwardly beyond the solid seat for making contact with the flapper before the flapper seats on the solid seat. The solid seat and the sealing lip are directed downwardly at an angle with the angle of the sealing lip being greater than the angle of the solid seat.
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