There is no internal scale product of dry screwpump owing to the late research starting, so like products are all depend on importing and the price is very expensive.
由于国内螺杆干泵的研究起步较晚，目前还没有规模化的产品，同类产品全部依靠进口，价格十分昂贵。
2
Vertical three-screwpumpinternal simple and compact structure, high efficiency, strong self-priming capacity, energy saving effect is good;