BZ and BZH are single-stage, centrifugal and self-priming pumps, which are applicable for transporting clear water, seawater and other liquids with the similar physical and chemical properties as clear water, The maximum working medium temperature shall not exceed 80℃. They can be widely applied for pumping of water towers, irrigation, drainage and sprinkling irrigation of farmland, and industrial and domestic water supply in cities and rural areas. BZ is a new-type water pump, which can exhaust air in the inlet pipe to pump up water without water diversion in starting. When working with an automatic liquid level control box, it will have a .function of automatic water supply and drainage.