| 摘要 |
A shut-off or flow control valve comprises a valve body including a cylindrical cavity with a hemispherical end, which rotatably receives a cylindrical plug with a hemispherical end in a close tolerance, wherein a flow passage with a central axis generally passing through the center of a spherical surface including the hemispherical surface of the plug and intersecting the central axis of the plug in an oblique angle lines up with the flow passage disposed through the valve body when the plug is rotated to the "open" position, while the plug blocks the flow passage through the valve body when it is rotated to the "closed" position.
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