| 摘要 |
An actuation system for a tubular handling mechanism of a tubular handling assembly, the actuation system comprising: a mud flow path passing through rotating parts and non-rotating parts of the tubular handling assembly; a valve assembly including a valve seat in the mud flow path and a ball, the valve seat positioned to be in hydraulic driving communication with the tubular handling mechanism; and a ball drop assembly including an opening to the mud flow path through which the ba ll is released and wherein the ball drop assembly opening is positioned in a non- rotating part.
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