Method of fabricating valve housings with the highest degree of security applicable for example in a nuclear reactor

摘要

This method enables to use in the printing process region of the nuclear reactor building, where high levels of security are required fittings, such as valves, of up to about 1000 mm nominal diameters, by manufacturing the valve housing (1) of malleable steel. The hot block is first deformed smoothly in a die into a unilaterally open, tubular starting body.; At the open end a thickening of the material (6) is then surfaced to produce there a cylindrical portion (39) of larger diameter. The underlying part is flattened so that two parallel walls (23) are formed. These are each provided with a mutually coaxial aperture carried collar (10, 11) of casing pipe stubs (8, 9) is closed. The collar circumference the weld (12, 13) of the neck takes place (8, 9) to the housing (1). The symmetrically projecting into the housing interior nozzle member (14, 15) form the sealing surfaces (16, 17) for the closure member (3). Thanks to the Gehäuseabflachung and the resulting good accessibility of the weld seams (12, 13), this can also be checked during the operation by ultrasound and X-ray devices.