Orifice Plates

Orifice Plates

An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate). Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate.

  • Available in RF (Raised Face) or RJT (Ring Type Joint) configurations – Welding Neck / Slip-On / Threaded
  • Supplied with two 1/2" NPT tappings in each flange
  • Lambda Square Orifice Flange Unions are fabricated to ASME B16.36 requirements
  • Our Orifice Flange Union kits are available ready-to-install, complete nuts, bolts, screws, and gaskets

Unlike a standard orifice plate, the ORIPAC is a true primary element and includes components for differential pressure measurement.

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Differential flow metering for over 35 years.


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Concentric Orifice Plate

Concentric Orifice Plate

Square Edge Concentric Bore & Bevel
Concentric orifice with a square edge. Edge thickness is limited with a downstream beveled bore. Most common and economical type of orifice plate.

Concentric Orifice Plate

Counterbore Orifice Plate

Square Edge Concentric Bore & Counterbore
Square edged orifice precision counterbored to achieve thickness. Throat is reduced by upstream counterbore.

Concentric Orifice Plate

Eccentric Bored Orifice Plate

Square Edge Eccentric Bore & Bevel
Popular in water treatment, oil, and paper industries – anywhere flow contains solids and for slurries. Bore edge is typically inscribed in a circle 98% of line ID.

Concentric Orifice Plate

Segmental Bore Orifice Plate

Radius Bore
For flows with entrained solids or heavy sediments. Bore may be at the bottom or top of pipe depending on type of flow and type of unwanted materials.

Concentric Orifice Plate

Conditioning Orifice Plate

For Viscous Media
Holes may be at bottom of pipe to minimize restriction of flow, prevent ‘damming’ effect. Especially for short straight pipe runs and tight fit applications.

Concentric Orifice Plate

Restriction Bore Orifice Plate

Flow Control & Restriction
Not for flow measurement. Drops pressure and reduces flow. No bevel and no limit to Beta ratio.