A valve assembly includes a cartridge that includes a handle coupled to a stem and journaled in a bonnet coupled to an upper end of the stem, and a cage assembly coupled to a lower end of the stem and the bonnet. The cartridge is insertable through an upper end of a valve body, and the bonnet is securable to the upper end of the valve body by means of bonnet bolts. The cage assembly includes an off-set C-ball, which includes a curved face which is coupled to a rotatable C-frame and which is arranged to seal against a curved seat. Rotation of the stem rotates the off-set C-ball to permit or block flow through the cage assembly.

A valve assembly includes a cartridge that includes a handle coupled to a stem and journaled in a bonnet coupled to an upper end of the stem, and a cage assembly coupled to a lower end of the stem and the bonnet. The cartridge is insertable through an upper end of a valve body, and the bonnet is securable to the upper end of the valve body by means of bonnet bolts. The cage assembly includes an off-set C-ball, which includes a curved face which is coupled to a rotatable C-frame and which is arranged to seal against a curved seat. Rotation of the stem rotates the off-set C-ball to permit or block flow through the cage assembly.