What is a Segmental Wedge Flow Meter?

The segmental wedge flow meter element has a V-shaped restriction cast or welded into a flanged meter body that creates a differential pressure.

Segmental Wedge Flow Meter

wedge Flow meter

The functional principle of this measuring instrument is based on the Bernoulli principle (continuity and energy balance equations).

Using a wedge, a differential pressure is generated which can be equated with the mass or volume flow rate. The flow range is determined through the H/D ratio.

segmental wedge Flow Meter Working

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.

Wedge Flow Meter

segmental wedge Flow element
Image Courtesy: controlplusinc

The differential pressure transmitter will be installed on the tapping points as shown in above figure.

The wedge creates a differential pressure as like orifice and this differential pressure is measured using the DP transmitter and measures the flow rate.

Theory of segmental wedge Flow Meter
Image Courtesy: Wika

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2 thoughts on “What is a Segmental Wedge Flow Meter?”

  1. segmental wedge flow element
    please provide full detail like
    where is used what application what line means oxygen , nitrogen, co gas , water etc

  2. It usually used for high viscous material.. like bitumen, vaccume residue etc… Where if u use orifice that may be choke…


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