Ball valve seal with dynamic C-seal and static C-seal

摘要

A seal assembly is provided for a rotary ball valve having a top -mounted bonnet (14), thereby allowing the seal assembly to be installed and removed without removing the valve from the pipeline. In an embodiment, the seal assembly may include a seal ring (44) disposed within the valve interior and biased toward the ball element of the valve. A seal carrier (46) may be disposed between the seal ring and the valve body, and the seal carrier may be removably secured to the valve body by a plurality of bolts disposed in the valve interior. A primairy leak path (50) may exists between the seal ring and the seal carrier and a secondary leak path (52) may exists between the seal carrier and the valve body. A first and second auxiliary seal (82,56) may prevent fluid flow through the primary and secondary leak path, respectively.