... efficiency can be improved by 2-8% compared with series QJ submersible motor pump, the liquid spares are made in special craft ... lubricating, corrosive resisting, wear-resisting etc virtues. Meanwhile, the efficiency of the pump can be improved by 2-4%. 3. The ... my company. 4. Adopting advanced craft in China to produce pump set assuring reliable quality, long life. QJ series submersible pump for well