Container under variable pressure, in particular heat-exchange condenser

A container for enclosing a fluid under variable pressure, comprising

• a tubular element (1) comprising an outer end defining an opening (2) and axial locking means (8, 9) adjacent the opening;
• said axial locking means including a first slot (8) in a wall of the tubular element and a second slot (9) diametrically opposed to the said first slot;
• a plug (3) closing the opening and introduced by axial sliding into the said tubular element (1), said plug (3) comprising sealing means (5);
• and
• detachable axial stop means (7) comprising an elongate plate extending transversally within the tubular element between the outer end and the plug and co-operating said axial locking means to form a stop surface to prevent removal of the plug when there is an over-pressure in the container, said stop means being introduced transversally into said tubular element through said first slot to project outside said tubular element through said second slot,
• wherein the plate includes a central through hole (10), and wherein the plug includes a central rod (11) projecting through the central hole in response to over-pressure in the container.