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You are here: Home » Products » Restrictions and Critical Flow Devices » Restriction Orifice Plates » Restriction Orifice Plate Type IRB

EMCO Restriction Plate Type IRB


EMCO restriction plates are used to restrict the flow in order to prevent damage on pipe line equipment on the upstream side in blow down systems or to limit the flow / pressure to avoid damage on equipment on the downstream side. For insertion between compact flanges or clamp connection, we can help you with the right technical advice. Type IRB/1 is for RF flanges and type IRB/4 is for RTJ flanges. 



Design and calculation standards
ISO 5167, Shell Flow Meter Engineering Handbook, R.W. Miller: Flow Measurement Engineering Handbook, etc.
1/2" - 24", DN 15 – DN 600
Pressure rating
150 - 2500 lbs, PN 10 – PN 400
Orifice plate shape
Square edge concentric
Plate thickness
Thickness is calculated to handle the differential pressure, minimum 3 mm for IRB/1 and 20 mm for IRB/4
AISI 316, Duplex, Monel, 6Mo, Titanium Hastelloy, Inconel, others on request
Mounting style
Between Raised Face or Ring Type Joint flanges according to ANSI B16.5 or DIN standards.
With name plate in AISI 316 with the following inscription : TAG no., serial no. pressure rating, inner pipe dia., bore, material.
Material certificate acc. to EN 10204-3.1. Noise calculation for gas. Hydro dynamic noise calculation for liquid. If noise level is above acceptable level, Multi hole plate or multi stage pressure reduction is the solution.

Additional Images and Drawings

Who to contact?

Christoffer Thrane
Sales & Marketing Manager