As the liquid flows through the
Venturi
tube, due to its peculiar shape, a differential pressure
is developed in the pipe line. This differential pressure
is measured using a manometer.
The liquid flow rate is proportional to the square root of
the differential pressure created in
the pipe line.
Flow
Nozzles
Scientific
Devices Flow
Nozzles are calculated, design and manufactured to ASME recommended
to provide high accuracy flow measurement. The flow nozzle
offers some distinct advantages over the thin plate orifice
in that it produces loss of differential pressure for a given
beta ratio resulting in overall lowerpermanent pressure loss.
Conversely, the flow nozzle will allow maximum flows nearly
twice as great as a thin plate orifice with the same differential
pressure. Accuracy is also sustained indefinitely since there
are no sharp edges or protusions to wear.