These pumps feature a fully-encapsulated, leak-free construction that is unique compared to other pumps that typically consist of a pump casing, impeller, external and internal magnetic rotor, axial thrust, and bearing distance sleeve. The pump and motor are connected coaxially, while the shielded sleeve can ensure the material does not make contact with the machine and the air at the same time. The flow passage uses corrosion-resistant materials like Ni-Cr alloy, titanium alloy and stainless steel. The new design ensures a wide range of uses, so it can meet the requirements of various industries such as petroleum, chemistry, chemical engineering, electricity, food, pharmacy, synthetic Fiber and so on. The pumps are able to transmit corrosive liquid with a viscosity below 365 centistokes, as well as liquid containing few non-ferrous particles.