Patent ID: 8678398

Claim:
A sealing device for use between joined pieces in a flow line that is operative for fluid passage therethrough, comprising: a flat metal plate having opposing side surfaces and an opening formed therein to allow fluid passage therethrough; a layer of dielectric material disposed on opposing side surfaces; a pair of inner grooves and a pair of outer grooves formed on said opposing side surfaces, at least one of which penetrate through said layer of dielectric material and into said metal plate and which extend completely around said opening, wherein said pair of inner grooves have substantially identical diameters and said pair of outer grooves have substantially identical diameters greater than the diameter of the inner grooves and wherein said inner grooves comprise a first depth and said outer grooves comprise a second depth greater than said first depth; a primary seal element disposed in said inner groove; a secondary seal element disposed in said outer groove; and a compression limiter.