Pumps can be classified according to different things
. There are positive displacement pumps and impeller pumps if they are classified according to their working principle. As to the latter type, they can be further divided into centrifugal pump, axial pump, mixed-flow pump, peripheral pump, and jet pump. If classify them according to the pump shaft position, there are vertical pump, horizontal pump. There are still many other classification means. All in all, there are so many different pumps that they play rather important role in our industries.