| 摘要 |
A variable control ball valve includes a valve body containing a valve body flow channel; a valve ball rotatably mounted within the valve body flow channel, the valve ball having a full volume diametric ball channel with a laterally extending ball channel extension having progressively diminishing cross-sectional area; and a mechanism for rotating the valve ball about a ball rotational axis relative to the valve body flow channel; so that when the valve ball is rotated beyond the point at which the ball channel is aligned with the valve body flow channel, the valve body flow channel aligns with progressively narrower segments of the ball channel extension and the flow rate through the valve body flow channel is progressively diminished.
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