Answer Posted / p.rajavelu

Pump is adding energy to a fluid. The energy addition is
achieved by means of centrifugal force in centrifugal
pump.When fluid enters into the impeller eye (Center of the
impeller where vacuum exists because of pumping), the fluid
will be thrown out of impeller eye by a centrifugal force
which adding the velocity to the fluid. The volute
surrounding the impeller guides the fluid to the discharge
and it converts the velocity enegy to pressure energy
(head).when u keep the dischage valve closed, it will
attain the shut off head. once the discharge valve is
opened the flouid will start to flow and head will start
decreases since the energy addition is shared by pressure
energy and velocity energy.

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