The pump has a two-stage, end suction, horizontally mounted back pull-out design for hot, abrasive and corrosive liquids.
该泵为两级、轴向吸入，卧式安装的后拉式泵，适用于热的、磨蚀的和腐蚀的介质。
2
Presents the two-stage heat pump test-bed designed by the authors, analyses the problem existed in experiment and offers the improving method.
介绍了自行设计的双级热泵实验系统，分析了实验中遇到的问题，提出了改进方案。
3
A two-stage compression variable frequency air source heat pump (TV-ASHP) has been developed combining variable frequency technology with two-stage compression cycle.