Abstract: Disclosed is a closure for ducts or receptacles for pressurized fluids, including an annular supporting structure (10), which defines an opening (11) for accessing the duct or receptacle, and a hatch (30), connected in an articulated manner to the supporting structure (10), with the ability to move between a closed position and an open position, wherein the supporting structure (10) includes a sealing surface (13), characterized in that it includes a sealing element (20) that can be positioned in the opening (11), the sealing element (20) including an expansible portion (21) with an inner surface (24) facing the duct and an outer surface (23) facing the sealing surface (13), the expansible portion (21) being able to expand as a result of the pressure of the fluid that acts on the inner surface (24) so that the outer surface (24) is placed in contact with the sealing surface (13).

Abstract: Disclosed is a closure for ducts or receptacles for pressurized fluids, including an annular supporting structure (10), which defines an opening (11) for accessing the duct or receptacle, and a hatch (30), connected in an articulated manner to the supporting structure (10), with the ability to move between a closed position and an open position, wherein the supporting structure (10) includes a sealing surface (13), characterized in that it includes a sealing element (20) that can be positioned in the opening (11), the sealing element (20) including an expansible portion (21) with an inner surface (24) facing the duct and an outer surface (23) facing the sealing surface (13), the expansible portion (21) being able to expand as a result of the pressure of the fluid that acts on the inner surface (24) so that the outer surface (24) is placed in contact with the sealing surface (13).

Abstract: A closing system for pressurized pipes, includes an annular supporting structure, designed to be secured to one end of the pipe, a closing hatch mounted on the annular support, and elements for locking the hatch including a locking ring inserted into an annular cavity in the support to lock the hatch, wherein the inside edge of the hatch is tapered to form an inclined wall for coupling to a corresponding inclined wall in the annular support. The collapsible ring includes a number of sectors, one of which is fixed and integral with the hatch, while the others are hinged to the adjacent sectors, so that they can rotate on a plane parallel with the hatch until they exit from the annular seating and allow the hatch to open. The hatch is opened and closed simply by rotating it around a hinge.

Abstract: A closing system for pressurized pipes, includes an annular supporting structure, designed to be secured to one end of the pipe, a closing hatch mounted on the annular support, and elements for locking the hatch including a locking ring inserted into an annular cavity in the support to lock the hatch, wherein the inside edge of the hatch is tapered to form an inclined wall for coupling to a corresponding inclined wall in the annular support. The collapsible ring includes a number of sectors, one of which is fixed and integral with the hatch, while the others are hinged to the adjacent sectors, so that they can rotate on a plane parallel with the hatch until they exit from the annular seating and allow the hatch to open. The hatch is opened and closed simply by rotating it around a hinge.