A component installed in a manifold for restricting flow, reducing pressure, or measuring flow rate.
Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plug.
Orifice calculations are based on a Venturi nozzle, namely, Bernoulli's principle, which states that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa.
Example of 5/16"-24 UNF orifice plug inside #10 SAE port