The shear ram valve not only can shear wire ropes, but also can close a well mouth, thereby largely satisfying the safety of pumping operation in an oil filed.

本实用新型既能剪切钢缆又能封闭井口的装置，极大地满足了油田捞油作业的安全。

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And there are some leaks from the upper part of the wellhead where the shear ram has closed.

WHITEHOUSE: Press Briefing