The thesis studies mainly the drive and control technique of aeronautic linear DC step motor(LDCSM) used in emergency discharging oil valve on airplane.

本文针对“十五”航空基金项目—新型航空用直线直流电动机驱动控制系统，研究了飞机应急放油阀用航空直线步进电动机的驱动控制技术。

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If the 450-ton valve at the wellhead can be turned on, the oil flow should stop, and the spill could be ended quickly.

如果井口450吨重的阀门可以可以关上，油流就可以停止，那么溢油很快就可以停下来。

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The oil stored in tanks in a former refinery was sabotaged when someone opened the main valve.

有人打开了石油的主要阀门，导致油厂内的石油倾泻而出。

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Risk assessments on the next stage, to close off the valve where the oil is coming from, are still being carried out.

BBC: Shell claims progress on North Sea oil leak

Though a program displays panels showing all the critical processes of a real rig (fire and gas detectors, valve status, oil flow from the sea bed and so on), and then responds to the actions of the trainee by altering these displays appropriately, a human operator can intervene at any time if things seem to be going too smoothly.

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Mike Schaffner directs information technology for the Valve and Measurement Group of oil and gas products and services company Cameron in Houston.

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