A spring energized seal assembly comprising: a sealing member having a seal body with an annular opening, an inside flange defining the annular opening, an outside flange, a center channel section located between the inside flange and the outside flange, and a spring cavity defined by the inside flange, the outside flange, and the center channel section; wherein: a canted coil spring is located in the spring cavity of the seal body to contact and bias both the inside flange and the outside flange away from one another, said canted coil spring comprising plurality of coils each with a coil center, each of the plurality of coils comprising a coil width, wherein the coil centers of the plurality of coils remain hollow; wherein the outside flange of the sealing member is provided with a radial overhang to close up or close in an opening to the spring cavity; characterised by at least one straight segment having a straight section that is at least 25% of the coil width, wherein the at least one straight segment contacts the inside flange or the outside flange of the seal body to form a line contact with the seal body, wherein each of the plurality of coils comprises a second straight segment having a straight section that is at least 25% of the coil width, wherein the inside flange comprises an interior flange surface comprising a notch formed in the interior flange surface of the inside flange. a sealing member having a seal body with an annular opening, an inside flange defining the annular opening, an outside flange, a center channel section located between the inside flange and the outside flange, and a spring cavity defined by the inside flange, the outside flange, and the center channel section; wherein: a canted coil spring is located in the spring cavity of the seal body to contact and bias both the inside flange and the outside flange away from one another, said canted coil spring comprising plurality of coils each with a coil center, each of the plurality of coils comprising a coil width, wherein the coil centers of the plurality of coils remain hollow; wherein the outside flange of the sealing member is provided with a radial overhang to close up or close in an opening to the spring cavity; characterised by at least one straight segment having a straight section that is at least 25% of the coil width, wherein the at least one straight segment contacts the inside flange or the outside flange of the seal body to form a line contact with the seal body, wherein each of the plurality of coils comprises a second straight segment having a straight section that is at least 25% of the coil width, wherein the inside flange comprises an interior flange surface comprising a notch formed in the interior flange surface of the inside flange. a canted coil spring is located in the spring cavity of the seal body to contact and bias both the inside flange and the outside flange away from one another, said canted coil spring comprising plurality of coils each with a coil center, each of the plurality of coils comprising a coil width, wherein the coil centers of the plurality of coils remain hollow; wherein the outside flange of the sealing member is provided with a radial overhang to close up or close in an opening to the spring cavity; characterised by at least one straight segment having a straight section that is at least 25% of the coil width, wherein the at least one straight segment contacts the inside flange or the outside flange of the seal body to form a line contact with the seal body, wherein each of the plurality of coils comprises a second straight segment having a straight section that is at least 25% of the coil width, wherein the inside flange comprises an interior flange surface comprising a notch formed in the interior flange surface of the inside flange.