| 摘要 |
A forged steel male end valve provided with a new and improved body with a centering end ring adapted for butt welding as for instance with respect to a tank or pipe, said body being greatly enlarged in diameter, compared to the bore of the body, adjacent to the centering ring, and tapering gradually downwardly from a maximum to a minimum cross-sectional area intermediate the ends of the body. The valve body as a whole is greatly elongated to provide space for application of insulation. The valve body includes in addition to the enlarged end portion, a portion of generally uniform cross-section, extending from the gradually tapered portion, the uniform portion being preferably of equal or greater length than the downwardly tapered portion. Thereafter the outer diameter of the body may e.g. remain uniform for a short distance and then it slopes gradually downwardly to the portion of uniform diameter. A space is provided between the abruptly upwardly sloping portion and the receiving opening of the tank or pipe in which the centering ring is located, which space may be used to accommodate welding material for a butt weld. The elongated body portion of a reduced diameter beyond the portion of maximum thickness provides space for the application of insulation material if desired.
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