Semi-aluminum pump BL (pump part is aluminum alloy, motor spindle is stainless steel), aluminum pump L (motor and pump parts are all aluminum alloy, motor spindle is stainless steel), the use of semi-aluminum pump and all-aluminum pump, stainless steel The advantage of the shaft is that it can pump weak corrosive medium, PH value is 3.5 --- 6.5. QY series submersible pump is suitable for environmental water temperature is not higher than 40 ℃, the volume of solid impurities in water does not exceed 1 ℅, the particle size of not more than 0.20 mm, the depth of the water pump shall not exceed 0.5 --- 5 meters, QY type pumping medium For non-corrosive water, PH value of water is 6.5-8; its structure is on the pump motor, water for underground mining, urban water company to take water, irrigation and drainage and other occasions.