The QSZ axial flow submersible electric pump and QSH mixed flow submersible electric pump developed by Longrun are mainly developed and designed based on the characteristics of China's rivers, severe flood control and drainage forms, and the occurrence of drought conditions at any time. This model is mainly used in plain areas, with a lift of 2.5-15m, a flow rate of 450-5000m3/h, and an irrigation area of about 1000-5000 acres for small and medium-sized electric drainage and irrigation stations. It is more suitable for temporary flood control, drainage, and irrigation in areas without pumping stations, and can also be used for large-scale fountain water features, water curtain water supply, amusement park surfing water sources, and other purposes of circulating water.

The characteristics of this machine are: the water pump is connected to the motor and works underwater at the same time. It can be operated remotely or automatically controlled without the need for a pump room or ground building facilities, thus greatly saving station construction investment. The machine also has the advantages of simple structure, easy installation and maintenance, reliable operation, and high efficiency of pump station equipment.