Comparison between Dynamic pump and Positive displacement pump

Comparison between Dynamic pump and Positive Displacement Pump :

Dynamic Pump	Positive Displacement Pump
High flow rate pump	Low Flow rate pump
Low Pressure pump	High Pressure pump
Steady flow	Pulsating flow
Relief valve not needed	Relief valve needed
Less noise	More noise
High speed	Low speed
High efficiency for low head	Low efficiency for low head
Mostly utilize for fluid transfer	Mostly utilize for fluid power
Course strainer(filter)	Fine Flow filter
Flow control valve used	Flow control valve cant be used
NRV needed at discharge and sometime at suction	NRV needed at discharge side only
Uniform torque	Torque not uniform
Installation easy	Installation difficult
Flowrate varies with change in pressure	Flowrate constant with change in pressure
Low initial cost	High initial cost
Low maintenance cost	High maintenance cost