what is bevel? why bevel required in orifice plate?

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what is bevel? why bevel required in orifice plate?..

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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what is bevel? why bevel required in orifice plate?..

Answer / salis

If the orifice plate is relatively thick (1/8 or an inch or more), it may be necessary to bevel the
downstream side of the hole to minimize its contact with the fluid stream.

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