A valve comprising: a valve body having an inlet, an outlet, and a valve interior in fluid communication with the inlet and outlet; an eccentric cammed ball element pivotably mounted in the valve interior, an exterior surface of the ball element defining a portion of a sphere, wherein all points on the exterior surface of the ball element are not equidistant from a natural pivot point of the ball element; and a seal assembly, the seal assembly comprising: a seal ring disposed within the valve interior and biased toward the ball element, wherein the seal ring is adapted to sealingly engage the ball element; a seal ring retainer threadedly secured within a recess in the valve body and located so as to retain the seal ring in the recess between the valve body and the seal ring retainer, the seal ring retainer being removably secured to the valve body by a threaded connection, wherein a secondary leak path exists between the seal ring and the valve body, the secondary leak path being exposed to fluid pressure within the valve, the seal ring retainer including a cylindrical retainer inner wall, a cylindrical retainer outer wall, a retainer upstream wall, a retaining downstream wall, and an auxiliary seal disposed between the seal ring and the valve body, the auxiliary seal preventing fluid flow through the secondary leak path, wherein the seal ring is movable both axially and radially within the valve body, characterized in that the seal ring retainer has an L cross-sectional shape and a recess formed between the cylindrical retainer inner wall and the retainer upstream wall to provide clearance from the ball element. a valve body having an inlet, an outlet, and a valve interior in fluid communication with the inlet and outlet; an eccentric cammed ball element pivotably mounted in the valve interior, an exterior surface of the ball element defining a portion of a sphere, wherein all points on the exterior surface of the ball element are not equidistant from a natural pivot point of the ball element; and a seal assembly, the seal assembly comprising: a seal ring disposed within the valve interior and biased toward the ball element, wherein the seal ring is adapted to sealingly engage the ball element; a seal ring retainer threadedly secured within a recess in the valve body and located so as to retain the seal ring in the recess between the valve body and the seal ring retainer, the seal ring retainer being removably secured to the valve body by a threaded connection, wherein a secondary leak path exists between the seal ring and the valve body, the secondary leak path being exposed to fluid pressure within the valve, the seal ring retainer including a cylindrical retainer inner wall, a cylindrical retainer outer wall, a retainer upstream wall, a retaining downstream wall, and an auxiliary seal disposed between the seal ring and the valve body, the auxiliary seal preventing fluid flow through the secondary leak path, wherein the seal ring is movable both axially and radially within the valve body, a seal ring disposed within the valve interior and biased toward the ball element, wherein the seal ring is adapted to sealingly engage the ball element; a seal ring retainer threadedly secured within a recess in the valve body and located so as to retain the seal ring in the recess between the valve body and the seal ring retainer, the seal ring retainer being removably secured to the valve body by a threaded connection, wherein a secondary leak path exists between the seal ring and the valve body, the secondary leak path being exposed to fluid pressure within the valve, the seal ring retainer including a cylindrical retainer inner wall, a cylindrical retainer outer wall, a retainer upstream wall, a retaining downstream wall, and an auxiliary seal disposed between the seal ring and the valve body, the auxiliary seal preventing fluid flow through the secondary leak path, wherein the seal ring is movable both axially and radially within the valve body, characterized in that the seal ring retainer has an L cross-sectional shape and a recess formed between the cylindrical retainer inner wall and the retainer upstream wall to provide clearance from the ball element.