Abstract: The installation according to the invention comprises at least one mould, a vessel intended to receive the liquid metal and means for directly determining the evolution of the level of molten metal in the impression of the mould. These determination means comprise means for detecting the presence of this liquid metal in the impression, particularly of electromagnetic nature, which are adapted to penetrate at least partially in the interior volume of this impression.

Abstract: Gas control and dispensing assembly comprising a lower unit (1) which is mounted on a gas tank (4) and houses a regulator (10, 9) and an upper unit (5) which is mounted on the lower unit (1) via a threaded ring (24) and houses an indexed flowmeter valve (14, 43) upstream of a low pressure gas outlet (19). The invention is suitable for transportable gas tanks and vehicle-body integrated gas tanks.

Abstract: An assembly comprising an intermediate volume of medium-pressure gas (8) in a transportable housing (3) which is advantageously combined with a user apparatus (4) and selectively connectable to a high-pressure gas supply (1) by coupling it to a filling unit (2) via a quick connection system (15, 16). The assembly is particularly useful in portable welding apparatuses.

Abstract: Assembly of a pressurizable beverage keg (8) and a reservoir (1) of pressurization gas containing CO.sub.2 and comprising an expansion valve (5). The reservoir (1) is a toric portion (2) disposed concentrically at one end of the keg (8). The expansion valve (5) is mounted on one of the ends (3) of the torus. The keg (8) has at one end a handling skirt (11) defining an internal space, and the reservoir (1) is entirely disposed in the internal space of the skirt (11). The expansion valve (5) is coaxial to its end (3) of the torus (2) and has a passage (6) for emptying and filling the reservoir (1), opening through the peripheral wall of the reservoir (1) adjacent the same end (3) of the torus.