Here the air and water discharged from the return valve to the back entrance of the impeller.
在这里空气排出而水又从回流阀返回到叶轮入口。
2
Pumps are horizontally mounted: single stage, end suction, back pull-out, ROTOKEY impeller mounting, simplified heavy-duty bearing unit etc.
该泵采用水平安装，单级、端吸、后拉式，ROTOKEY叶轮，简化了重载轴承部件等优点。
3
Pumps of the series SPP/SPV are single-stage mixedflow pumps, adopted open impeller and back pull-out design. They are available in both horizontal and vertical design.