| 摘要 |
A fluid ducting valve of the type comprising an interception ball (8) fitted with a through-duct (9) and sealing rings (14,15) interposed between such ball and fluid flow ducts (2',3'), in which such throughduct (9) of ball (8) is located with its longitudinal axis offset in the downstream direction relative to the axis of rotation of ball (8), when the latter is rotated to the position of interception, the relative distance between the longitudinal axis of duct (9) and the axis of rotation of ball (8) being such that upstream apertures (9a) of duct (9) are always closed before downstream apertures (9b) move on downstream sealing rings (15) with the valve either closed or open.
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