flow Measurement

restriction orifice plates


Parsjahd Co. designs diverse restriction orifice plates in accordance with ISO 5167 and based on customer demands. Our mission is to meet full range of customer needs and requirements in every aspect of measurement. Purpose of applying restriction orifices to lines is whether to reduce flow rate, or to intentionally create a pressure drop, or a temperature decrease.


  • Oil and Gas
  • Petrochemicals
  • Power Plants
  • Pharmaceuticals
  • Gas Processing and Transmission
  • Water Treatment and Distribution
  • Chemical Plants
  • Suitable for a Wide Range of Flow Measurement Applications
  • One of Most Common DP Producers
  • Direct and Easy Installation
  • Wide Range of Materials Offered
  • Available for RTI or Raised Face Flanges in Different Sizes and Configurations
  • Flow Calculation Standards Based on ISO5167, AGA and ASME MFC-3M.
  • Full Set of Documentation Available

Parsjahd Restriction Orifice Types

  • Single Stage Restriction Orifice
  • Single Stage Multi-Hole Restriction Orifice
  • Multi-Stage Restriction Orifice Plate Assembly

Orifice Bore Type

  • Square Edge (Standard) Bore
  • Quadrant Edge Bore
  • Eccentric Bore
  • Segmental Bore

Parsjahd provides full range of restriction orifice with different materials including: stainless steel, hastelloy, copper, aluminum bronze, K-monel, monel 400 and ect. Based on customer requirements, other materials with diverse designs are available.

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