B, single screw pump before adding buffer tank in pipeline, the buffering can store a certain amount of crude oil, and a current limiting device for mixture pumps supply a certain amount of crude oil.
单螺杆泵前管路中增设缓冲罐，在缓冲罐里储存一定量的原油，并用一套限流装置给混输泵供给一定量的原油。
Buffering Butterfly Check Valve is more suitable for use in the by pass of booster pump station.
蝶式缓冲止回阀是一种较为理想的直抽式加压泵站旁路止回阀。
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