V-shaped seal with anti-extrusion section

An Anti-extrusion sealing device for use in an annularly shaped enclosed area defined by axially extending surfaces and radially extending surfaces and having a rectangular cross section, with an axial dimension greater than the radial dimension wherein normal forces from line fluid act on the anti-extrusion sealing device, comprising:

• an upper extrudable body section having extrudable material and an upper end, said upper end including a top for applying the normal forces from fluids, an inner and an outer sealing surface opposing each other and depending downward from said top and contacting the enclosed area axially extending surfaces, and said upper extrudable body section having a lower portion depending downward from said sealing surfaces;
• a lower anti-extrusion section having an upper portion and a bottom, said bottom having a bottom surface, said lower anti-extrusion section being in contact at said upper portion to said lower portion of said upper extrudable body section and said bottom surface abutting the enclosed area lower radial surface, said lower anti-extrusion section serving to resist extrusion forces acting on said sealing surfaces adjacent said lower anti-extrusion section, said lower anti-extrusion section being comprised of a knitted material, at least some of the filaments of said knitted material being metallic in nature, said upper portion having inner and outer radial edges facing the axial sides of the enclosed area and an upper surface having at least a partial V-shape in cross-section between said radial edges.
• said upper extrudable body section having a lower end with a lower portion having a lower surface shaped for reception in said upper surface of said lower anti-extrusion section upper portion and said sealing surfaces extending radially beyond said edges prior to application of the normal forces from fluids;
• said lower anti-extrusion section bottom includes a portion below said V-shape upper surface of sufficient axial thickness to permit rotation of said edges and said upper surface so that said radial edges contact the axial surfaces of the enclosed area adjacent said sealing surfaces which contact the axial surfaces of the enclosed area upon the application of the normal forces from fluids on said top.

An anti-extrusion sealing device for use in an enclosed area subject to force from line fluid, comprising:

• an upper extrudable body section formed from extrudable material and having an upper end, said upper end including a top in contact with the enclosed area force from fluid and an inner and an outer sealing surface on opposite sides of said upper extrudable body section depending downward from said top and contacting the enclosed area and said upper extrudable body section having a lower portion depending downwardly from said sealing surfaces;
• a lower anti-extrusion section having an upper portion and a bottom, said bottom having a bottom surface, said lower anti-extrusion section being in contact at said upper portion to said lower portion of said upper extrudable body section and said bottom surface abutting the enclosed area, said lower anti-extrusion section having means for resisting extrusion forces acting on said sealing surfaces adjacent said lower anti-extrusion section, said lower anti-extrusion section being comprised of a knitted material, at least some of the filaments of said knitted material being metallic in nature, said upper portion having inner and outer radial edges facing the enclosed area and an upper surface having at least a partial V-shaped cross-section between said radial edges;
• said upper extrudable body section having a lower end with a lower portion having a lower surface shaped for reception in said upper surface of said lower anti-extrusion section upper portion;
• said lower anti-extrusion section bottom including a portion below said V-shaped upper surface of sufficient axial thickness to permit rotation of said radial edges and said upper surface so that said radial edges contact the enclosed area in response to fluid force applied to said upper surface, whereby upon application fluid force from the enclosed area upon said top, said radial edges rotate into contact with the enclosed area adjacent to said sealing surfaces, forming an anti-extrusion seal for said extrudable material said sealing surfaces.