Seal assembly with a hard seal layer actuated through a silicone layer

摘要: A seal assembly includes a body portion of an element to be sealed, groove formed into the surface portion, member relatively hard material for sealing gap between and another sealed. The has space defined proximate its bottom receiving pressure medium, protrusion or protrusions extending medium member, silicone rubber layer, cast in situ around protrusion, transferring from prevent escaping medium. In accordance with aspect invention, substantially same structure, but inflatable tube extends space, layer is at least partly tube. need not provided. method forming assemblies casting situ.