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EMCO Orifice Plate Series MEF with Single Pressure Tapping for Insertion Between Flanges


The EMCO Orifice Plate is used as a primary element in flow measurement of liquid, gas and steam applications based on the differential pressure principle. According to this working principle, the orifice plate creates a flow restriction in the pipeline to allow measurement of the resulting pressure drop and flow rate. 

The Orifice Plate Series MEF is constructed with a single pressure tapping for insertion between flanges. 




Design and calculation standards
ISO 5167-2, ASME MFC-3M, DIN 19205, Shell Flow Meter Engineering Handbook, L. K. Spink, AGA no. 3
DN 50 - 600, 2" - 24"
Pressure rating
PN 10 - 40, 150 - 600 lbs
Plate thickness
3 - 8 mm
Vent or drain hole
On request
AISI 316, other on request
Mounting style
Between flanges with flat or raised face according to DIN 2526, 2513, 2512, EN 1092-1 or RF according to B 16.5
Pressure taps
3/8", 1/2" BSP male, Ø 12 mm, 1/2" NPT
Tap Length
150 mm, others on request.
Tap Location
At least 45 degrees apart to be stated with order
Flanges with flat or raised face according to DIN 2526, 2513 or 2512, or RF according to ANSI B 16.5
Orifice plate shapes
Square edge concentric as standard. See above illustrations for other shapes.
The orifice plate is marked with "+" and"-" and flow direction.

Technical Data

+/- 0,6 % for β < 0,6 and equal to β for β values above 0,6
Pressure loss
Depending on β, for β equal to 0,6 : ca. 60 % of the differential pressure measured
Limits for Reynolds No
Re > 1260 x β2 D according to ISO 5167 2000 < Re < 108 according to ASME MFC-3M


Shut-off valves and condensing chambers for steam flow measurement. Flange assembly complete with bolts, nuts and gaskets



Before installation, the orifice plate must be kept clean and protected against corrosion and physical damage. It is also important that you pay careful attention to to the sharp edge of the plate. Once ensured that it is clean, install the orifice plate carefully such that the orifice bore aligns with the centre of the pipeline. Tap location varies depending on whether it is used for liquid, gas or steam. It is not supplied with any safety devices and must not be used for higher pressure, than stated on the name plate. The pipe system must therefore be equipped with a safety device. However, this type of primary element requires no special maintenance.

Download the installation guide above for more detailed information. 

Drawing of orifice plate with single pressure tapping

Who to contact?

Christoffer Thrane
Sales & Marketing Manager


Learn about the important difference between orifice plates and restriction plates