因为阀门设计产生了基本的变化，以克服较早的隔膜阀的缺点，这些阀门被称为第二代隔膜阀。
These valves are referred to as second generation diaphragm valves because basic changes in the valve design have been incorporated to resolve the deficiencies of the earlier diaphragm valves.
第二，单流阀效应引起孔隙压力下降，割理闭合，导致侵入的压裂液滞留其中。
The second is unilateral flow bring about the pore press lower, cleats close, and fracturing fluid deeped in it will settle.
重新定位阀 件允许流体通过，滑动柱塞使第一和第二组分会合。
Valve repositioning allows fluid passage and sliding of the piston joins the first and second components.
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