MDE series is covered with ductile iron (FCD450), the unique shape of the rear shell can prevent stress concentration, and with the FRP material of the rear shell reinforcing cover to form a double shell structure, greatly improving the pressure strength of the pump. In addition, the pump shaft and magnetic sac embedded with special metal, strengthen the mechanical strength, so that it can withstand the vibration and cyclic stress caused by high-speed rotation. As a result, the pump has excellent durability even in continuous operation under harsh conditions.