which pump highest efficiency ??
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There are two main families of pumps; positive displacement and centrifugal (rotodynamic), both of which have their uses and best areas of application. It is important however to be able to identify when each pump type should be selected, which ultimately comes down to their working principle and the application at hand.
Positive displacement pumps are characterised by an operation that moves fluid by trapping a fixed volume, usually in a cavity, and then forces that trapped fluid into the discharge pipe. A centrifugal pump transfers the kinetic energy of the motor to the liquid by a spinning impeller; as the impeller rotates it draws in fluid causing increased velocity that moves the fluid to the discharge point.
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Positive displacement pumps are characterised by an operation that moves fluid by trapping a fixed volume, usually in a cavity, and then forces that trapped fluid into the discharge pipe. A centrifugal pump transfers the kinetic energy of the motor to the liquid by a spinning impeller; as the impeller rotates it draws in fluid causing increased velocity that moves the fluid to the discharge point.
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