Device for the fluidtight closure of an aperture extending through a wall

Claim 1

Device for the fluid-tight closure of an aperture extending through a partition wall separating two fluids, which device consists of a tubular sleeve closed at one end by a stopper of tubular shape closed by an end piece, wherein the inside bore (2) of the sleeve (1) comprises, in succession, in the axial direction, a first part (2a) whose diameter is smaller than the outside diameter of the stopper, and a second part (2b) receiving the stopper and having a diameter corresponding substantially to that of the stopper (5), an annular shoulder (2c) separating the two parts (2a, 2b) of the bore, and wherein (a) the sleeve (1) has an aperture (4) passing through its side wall and leading into the second part (2b) of the bore (2); (b) the stopper (5) also has an aperture (8) passing through its side wall (5a) and so disposed that, when the stopper (5) is placed in position in the sleeve (1) and held in place by swaging (9) the sleeve (1), said aperture (8) in said stopper will be situated nearer the closed end (5b) than the aperture (4) in the sleeve (1), and that three continuous sealing and fastening welds (10a, 10b, 10c) of annular shape, connecting the outer surface of the stopper (5) and the inner surface of the sleeve (1) over their entire periphery and being disposed, in the case of two of them, one on each side of the set of two apertures (4, 8) in the stopper (5) and in the sleeve (1), and, in the case of the third, between the two apertures (4, 8), are made prior to placement of the closure device in the aperture (13) in the partition wall (3).