| 摘要 |
The position of a high-low valve on oil wells is remotely controlled and monitored from a distant control station in order to either shut the said valve or other associated valves and controls in case of severe environmental oil pollution/emergency conditions, or to open it during otherwise inaccessible periods or to remote control it at all times in order to conserve manpower. Such cases cover possibilities of oil leakage at a well, and failure of the usually provided shutoff valves at the well head.
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