why we are using orfice plate? then difference between orfice 7 nozzle plate?

why we are using orfice plate?
then difference between orfice 7 nozzle plate?

Question Posted / satish

why we are using orfice plate? then difference between orfice 7 nozzle plate?..

to create pressure difference in a flow line. withe the pressure difference we can measure the flow rate

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