Patent ID: 8733733

Claim:
A seal assembly for a rotary ball valve, the seal assembly comprising: a sleeve seal adapted to be mounted adjacent an inlet portion of a rotary valve body and to be engaged by a ball element of the rotary ball valve; a retaining device adapted to be attached to the rotary valve body and retaining the sleeve seal in the rotary valve body, the sleeve seal including a sealing leg portion in sliding contact with the retaining device; an annular channel defined in the sleeve seal, the annular channel having a first portion and a second portion circumscribing the first portion; a sealing insert ring disposed within the first portion of the annular channel, the sealing insert ring defining an annular seating surface against which the ball element sealingly engages when occupying a closed position; a back-up ring disposed within the second portion of the annular channel and circumscribing the sealing insert ring; a radial lip defined by the sleeve seal adjacent to the annular channel, the radial lip extending over an outer radial portion of the back-up ring to retain the back-up ring and the sealing insert ring in the annular channel.