Valve with movable shutter

A valve comprising a hollow body which extends along a main axis (X), wherein a secondary body is arranged at one end of the hollow body substantially coaxially with the main axis (X) and comprises an inner end portion with a collar that projects towards the inner surface of the hollow body, in which the hollow body comprises an annular groove in which a ring is arranged at least partially to prevent movement of the secondary body towards the end of the hollow body, in which the ring is divided into at least two arcs configured to be inserted individually inside the groove of the hollow body to form the ring, wherein one or more stops are arranged around the secondary body to lock the ring, characterized by the fact that said one or more stops have an arched shape to be arranged astride two and adjacent arcs of the ring and said one or more stops present a portion having a cross section with a substantially right trapezoid shape, the bases of the right trapezoid being perpendicular to the main axis (X) and the oblique side of the right trapezoid facing the ring, wherein the ring comprises an oblique side facing said one or more stops, so that the ring and said one or more stops form a shape coupling which prevents said one or more stops to move towards the end of the hollow body.