| 摘要 |
As a representative embodiment of the new and improved full-opening pipeline valve disclosed herein, a tubular valve body is formed of three separable full-bore members adapted to pass pipeline pigs and having a combined axial length corresponding to the standard overall length established by industry for both flanged and weld-end valves of that pipe size and pressure rating. The body members can be alternatively arranged into either of two body styles to enable the full-opening valve to be either welded into a pipeline or bolted into position between a spaced pair of opposed pipeline flanges. The body members include an annular member carrying a pivoted valve disc, with this body member being uniquely adapted to be clamped between a flanged body member and either another flanged body member or a pipeline flange depending upon which body style is required for mounting the full-bore valve in a given pipeline. In either of these body styles, the unique annular body member is wholly confined within the flange bolts so that this body member can be conveniently removed or the pivotally-supported valve disc may be selectively oriented to different angular positions as required to assure the passage of pipeline pigs by simply loosening the flange bolts and rotating the annular body member in relation to the other body members.
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