| 摘要 |
1,009,577. Making valves; welding by fusion; straightening. M. H. GROVE. March 9, 1964 [March 25, 1963], No. 9810/64. Headings B3A, B3E and B3R. A plate is welded to a channel-shaped structure to form gate-valve bodies of rectangular cross-section by compacting granular flux in the assembly comprising the plate and the structure and externally welding the longitudinal edges of the plate to the structure. The channel-shaped structure may be a single rolled section or may be fabricated by internally welding angle sections to a plate 10. The structure closed at its ends by tack welded plates 22 having apertures through which are passed hoses 18, 19, Figs. 5, 6. The plate 11 is tack-welded to the structure, and clamps 24 are applied. After inflation of the hoses 18, 19, longitudinal welds 25 are made by a two-headed submerged arc welding machine. The fabrication is now reversed and the plate 10 is similarly externally welded to the angles 12, tack welded plates 26, Fig. 7, serving as flux retainers. The resulting fabrication is cut into lengths and formed with apertures 36, Fig. 8, to constitute valve bodies for use in the fabrication of gate valves, Fig. 10. Sealing rings 45, fluid passages 37, and end assemblies 41, 39 are welded to each body. Straightening.-After each pair of longitudinal welds are completed, the fabrication assumes a bowed shape which during cooling straightens and finally takes up a reverse curvature. To prevent this, the fabrication is held by clamp 61, Fig. 12, on a support 59 in its initial bowed condition while cooling, so that when released it assumes straighteness. |
