Patent ID: 8434515

Claim:
A sleeve valve comprising an outer sleeve and an inner sleeve arranged therein, the sleeves being rotatable relative to one another and wherein in each of the sleeves there is provided at least one through aperture, fluid flow through the sleeve valve being allowed by an overlapping of the sleeves' through openings, and wherein in the through opening of the outer sleeve there is arranged, seen in relation to a longitudinal axis of the sleeve valve, at least one radially movable insert, an inner metallic end of the insert cooperating with a metallic surface on the inner sleeve to provide a metal-to-metal seal, wherein between the outer sleeve and the insert there is formed a chamber, and wherein in the chamber there is provided a tension element, and one or more gaskets arranged radially outside the chamber between the outer sleeve and the insert, wherein an offset area on an outer face of the insert, which is subjected to a pressure externally by the outer sleeve, is equal to the area of an offset area in the chamber, which is subjected to a pressure internally from the inner sleeve, the sum of these areas being as great as the area of the inner end of the insert which creates a surface pressure against the surface of the inner sleeve, independent of the direction of the pressure differential between external/internal pressure.