Plug valve comprising at least: - a valve body comprising an internal volume associated with at least two communication orifices in communication with respective conduits , - a cylindrical plug of circular section, the plug comprising at least one circuit passing between at least two orifices in the peripheral surface of the plug , at least two orifices of the plug being arranged on the peripheral surface to enable said orifices to be positioned simultaneously opposite respective communication orifices of the valve body , - an intermediate element comprising at least two through-orifices between two opposing surfaces, specifically an inner surface and an outer surface , the through-orifices being arranged opposite respective communication orifices of the valve body , the outer surface of the intermediate element being designed to be positioned opposite the internal volume of the valve body , the inner surface bearing at least one relief surrounding a through-orifice being designed so that the top of the relief forms about the orifice at least one continuous contact surface bearing against the peripheral surface of the plug , - a gasket positioned in compression on an orifice between the intermediate element and the valve body , the valve characterized in that the top of the relief of the inner surface of at least a part of the intermediate element defines a contact surface corresponding to at least all of the points of the virtual intersection between, on one hand, a cylinder parallel to the axis of the through-orifice surrounded by the relief and, on the other hand, a circular cylinder of which the axis coincides with the axis of the plug and of which the radius is less than or equal to the radius of the plug . - a valve body comprising an internal volume associated with at least two communication orifices in communication with respective conduits , - a cylindrical plug of circular section, the plug comprising at least one circuit passing between at least two orifices in the peripheral surface of the plug , at least two orifices of the plug being arranged on the peripheral surface to enable said orifices to be positioned simultaneously opposite respective communication orifices of the valve body , - an intermediate element comprising at least two through-orifices between two opposing surfaces, specifically an inner surface and an outer surface , the through-orifices being arranged opposite respective communication orifices of the valve body , the outer surface of the intermediate element being designed to be positioned opposite the internal volume of the valve body , the inner surface bearing at least one relief surrounding a through-orifice being designed so that the top of the relief forms about the orifice at least one continuous contact surface bearing against the peripheral surface of the plug , - a gasket positioned in compression on an orifice between the intermediate element and the valve body , the valve characterized in that the top of the relief of the inner surface of at least a part of the intermediate element defines a contact surface corresponding to at least all of the points of the virtual intersection between, on one hand, a cylinder parallel to the axis of the through-orifice surrounded by the relief and, on the other hand, a circular cylinder of which the axis coincides with the axis of the plug and of which the radius is less than or equal to the radius of the plug . <EOS>