When the level exceed limited height, the alarm send signals to start self-priming pumpdrain.
当水位超过限制高度时，发出信号启动自吸泵排水。
2
There are well-designed pumpdrain back tank and is exposed in the work gear torque exerted the smallest, so bearing loads of small, wear, pump efficiency.
泵内有设计合理的泄油和回油槽，是齿轮在工作中承受的扭矩力最小，因此轴承负荷小，磨损小，泵效率高。
3
Pump shaft seals use mechanical seal, pump top and bottom, respectively, equipped with water injection plug and the drain plug.