Wellhead seal

An annular wellhead seal comprising

• a seal ring having a central body with an upwardly facing shoulder, an upper rim extending above the central body, a lower rim extending below the central body, said central body having a central bore, said shoulder defining an annular surface intersecting the outer rim at an angle and extending substantially from the outer rim to the central bore of the central body,
• said upper rim having external projections providing a gripping and sealing surface and multiple internal tapered camming surfaces,
• said lower rim having internal flexible metal sealing means,
• a structure surrounding seal ring, and
• an actuating ring positioned within said upper rim and having multiple external camming surfaces mating with said multiple internal camming surfaces of said upper rim, the camming surfaces on said actuating ring and said upper rim being positioned so that downward movement of said actuating ring forces said upper rim outwardly to cause said external gripping sealing surface projections to engage a surface on said structure facing and immediately surrounding the exterior of said upper rim in tight gripping and sealing engagement.