The segmental wedge element has a V-shaped
restriction cast or welded into a flanged meter body that creates a
differential pressure. The restriction is characterized by the h/D ratio,
corresponding to the β ratio of an orifice plate, where (h) is the height of
the opening below the restriction (the only critical dimension) and (D) is the
inside diameter of the pipe. It can be used for a variety of corrosive,
erosive, and highly viscous fluids and slurries. The discharge coefficient (Cd)
is a stable for Reynolds numbers of less than 500 – allowing it to be used down
to laminar flow regimes.
The upstream and downstream pressure taps are usually
in the form of remote diaphragm seals eliminating the need for lead lines.
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