An alternative design to control flow, with a wide range of options.

Restriction orifice unions feature a single piece metal orifice plate that fits perfectly into the union seat, eliminating the need for a gasket. Orifice unions are commonly used in fire pump systems, since they have the ability to handle higher levels of pressure while maintaining a smaller overall pipe size. This also makes them perfect for small bore applications.

  • Available with pressure ratings of 3000 and 6000 psig.
  • Threaded and socket-weld connections available
  • Unions are available in A105 carbon steel or 316 stainless steel, along with other materials
  • Available in pipe sizes ranging from 1/8” – 2”

Material Options: A105 carbon steel or 316 stainless steel

Industries: Any industry that requires flow restriction, including coolants, gases, steam and water.

  • Restriction Orifice Union 1
  • Restriction Orifice Union 3
  • Restriction Orifice Union 2
Mac-Weld Orifice Plate Catalogue

Mac-Weld Orifice Plates
and More Catalogue

Available in a variety of styles, sizes and materials, see our catalogue for more details.

As a company we try very hard to respond with a competitive cost with a delivery on average of one week

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