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Orifice plates which are used in flow measurement are mostly concentric "square-edge" type.
The bore of the orifice is not constant when one moves from the upstream side to the downstream side along the cross section.
The bore size is constant for a few mm only and then expands till it reaches the downstream face. This inclined cut is called the bevel in an orifice.
The main reason to have a bevel in the orifice is to avoid turbulence thereby providing more accuracy to the measurement.
Restriction Orifice plates are not beveled since their intent is to reduce the pressure only.
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