A, a measurement requirements, choose metering pump.
   B, head high requirement, the flow is small and there are no suitable small flow, high-lift centrifugal pump can choose, can choose reciprocating pump, such as cavitation requirement is not high also can choose vortex pumps.
   C, head is very low, the flow is very big, can choose reliable and mixed flow pump.
   D, medium viscosity larger (more than 650 ~ 1000 was the/s), can consider to choose the rotor pump or reciprocating pump (gear pump, screw pump.
   E, medium containing gas flow small and viscosity, 75% less than 37.4 was the/s, can choose vortex pumps.
   F, to start filling the inconvenience of pump or frequent occasions, should choose has self-priming performance, such as the pump self-priming centrifugal pump, of self-suction vortex pumps, pneumatic (electrical) the diaphragm pump.

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