当您回到您启动阀杆与第二阀杆上发表演讲，并继续以同样的方式，并在第三关你的第三个开始从阀杆发言。
When you get back to the valve stem you start with the second spoke from the valve stem and continue the same way, and on the third pass you start with the third spoke from the valve stem.
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.
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