Abstract: A globe valve comprising: a control rod (70) which is movable in translation along a valve axis (XX'), handle means (90) for controlling movements of said rod in translation, a disk (74) fixed to one end of said rod; a body (12) having an inlet passage (14) and an outlet passage (16) therethrough for passing a liquid, said passages giving access to a cavity (18) which is extended via a cylindrical orifice (22) disposed along said valve axis in order to receive said rod; a cage (36) lodged inside said cavity and within which said disk is capable of being moved by axial displacement of said rod; packing (46) surrounding a portion of said rod and disposed within said cylindrical orifice; a seat (28) which is removable from said body for cooperating with said disk in a closure position, said seat having a first face defining a sealing bearing surface for cooperating with said disk and a first annular thrust bearing orifice, and a second face defining a second annular thrust bearing surface; means for defining a t

Abstract: An improved ball valve is disclosed, which is particularly adapted for use with pipelines of large diameter, possibly of the kind intended to convey toxic or dangerous fluids and for which a virtually perfect seal is required, said valve having a control mechanism which comprises sequentially acting linkages and preloaded resilient means in order that the valve shutter is always in an accurate central position as to its axis of rotation and the approach of the shutter to the seat takes place only once that the rotation of 90.degree. has been completed, in order that a uniform and intense pressural action of the shutter on the seat may be obtained. Alternative embodiments within the scope of the invention are shown and described.