It varies the structural design of standard type top valve housing, and extends the lifetime.

该防断上阀罩改变了标准型上阀罩结构设计，延长了使用寿命。

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The top valve will have the dip tube in the vapor and the bottom valve will have the dip tube in the liquid.

上面的阀门的汲取管处在蒸气里，下面的阀门的汲取管处在液体里。

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The shortcoming of top valve housing for standard type oil well pump plunger is wear and rupture of oil flow pore wall.

标准型抽油泵柱塞上阀罩的工作缺陷是出油孔壁磨损断裂。

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They're making plans now for -- even as they drill these two relief wells that optimistically will take quite some time -- how do we plug this leak either through using the robotics to effect the valve -- how are we dispersing this so that that oil never gets to the top and then through a natural system gets -- largely dissipates at the bottom?

WHITEHOUSE: Aboard Air Force One En Route Andrews Air Force Base