ASSEMBLY FOR COMPRESSING A BALL-VALVE SEAT

The main subject matter of the invention is an annular assembly (10) for compressing the seat (6) of a ball valve (1), characterised in that it comprises a valve body (5) or an insert (7), provided with an inner annular counterbore (5a) defining an inner counterbore diameter (Di), a sleeve (8) inserted into said inner annular counterbore (5a), defining at least one outer diameter (De) of the sleeve (8), the body (5) or the insert (7) defining, with the sleeve (8), an annular housing (11) in which the assembly (10) comprises successively: a downstream stack (12) of head rings, an annular head shim (13), a stack of compression means (14), an annular bottom shim (16) and an upstream stack (17) of bottom rings. The principal object of the invention is an annular assembly for compressing a seat of a ball-valve, comprising a valve body or insert, provided with an annular internal counter-bore which defines an inner counter-bore diameter), a sleeve inserted into said annular internal counter-bore, defining at least one outer diameter of the sleeve, the body or the insert defining with the sleeve an annular housing in which the assembly comprises, in succession: a downstream stack of head rings, an annular head shim, a stack of means of compression, an annular base shim and an upstream stack of base rings.