Question

what is an orificemeter ?

Answer 1

An orifice meter is a conduit and a restriction to create a pressure drop. An hour glass is a form of orifice. A nozzle, venturi or thin sharp edged orifice can be used as the flow restriction.

Answer 2

An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate ). Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate.