The procreative blanking plug of the "Y type" pipe string has check valve function and it can conveniently for reverse circulation well cleanup.
型管柱中的生产堵塞器具有单流阀作用，可方便进行反循环洗井；
The paper involves an investigation into the new steel pipe manufacture technology of roller die drawing with the two-stand Y type three-high mill.
研究了利用二连式Y型三辊辊模拉拔钢管生产新技术。
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