The oil-filled or water-filled pumps of this series are produced by standard GB/T 2818-2002. The oil-filled motors include three types, YQSY150、YQSY200、YQSY250. inside the motor is machinery oil; at the  two ends are bearings to support the motor; the top is sealed with hard alloy. Thus, it can be used in areas even with high-ratio mud, vertically or horizontally.
　　The water-filled motors fall into models YQS150, YQS175, YQS200, YQS250, YQST200, YQST250, YQST300 and YQST350. YQS is a common submersible motor type; YQST is a type following western pattern, with the main abrasion-proof parts made of imported materials (guide bearings， thrust bearing)。 It is characterized by massive push and abrasion resistance.