The rear open structure is convenient for maintenance, stable operation, reliable, long service life and low noise motor. It is about 10dB lower than similar products. Before leaving the factory, the 2.4MPa withstand voltage test is conducted to ensure safe use. The rear open structure is convenient for maintenance. There is no need to dismantle the pump body and the water inlet and outlet pipes. It is universal. There are only four types of shafts, bearings, and coupling covers, which reduce the number of spare parts. It is convenient for maintenance and management. There are sealing rings at the front and back of the impeller, The rear cover plate of the impeller is equipped with an axial force wear-resistant mechanical seal device of the balance hole balance pump to ensure no water leakage under high water pressure. The lubrication structure of bronze impeller, stainless steel shaft and imported bearing is divided into dry grease lubrication and wet mechanical oil lubrication. The world's best design software and hydraulic model are used. The advanced vacuum casting process is used. The main components are processed by CNC lathes. All impellers are subject to strict dynamic balance tests. The double volute structure is designed with high-quality mechanical seals. A variety of mechanical seals are available for selection. The lubrication device is convenient to put in place. It can be quickly overhauled. The lubrication is reliable. The minimum service life of high-quality double row thrust ball bearings is 5 years. All cast iron and all bronze, Special alloy and other materials are available for selection. The mounting base and the motor tongue and groove type matching vertical structure have the advantages of small floor area, linear matching in any direction, and high position motor to prevent flooding.