Flow Nozzles

Canada Pipeline Accessories presents the best solution for your flow regulation and calibration needs: our critical flow venturi sonic nozzles. Offered in many different flange and installation configurations, our nozzles are reliable, cost beneficial and require zero maintenance.

CPA Sonic Nozzles can be manufactured to protect all types of positive displacement, turbine and orifice meters. They may also be ordered with pressure taps which allow our nozzles to perform backup or secondary gas measurement service; acting as a backup measurement device in the subsonic regime and as an over speed protection device when choked.

CPA Nozzles can be manufactured to your preferred standard, or using CPA’s own in-house design, in a material of your choice. CPA offers flow nozzles, Venturi nozzles, Venturi tubes and many other design types. Once machined and inspected, the nozzles can be calibrated at one or more recognized, independent labs, according to your specifications.


  • Zero maintenance, low fouling rate and a simple concept
  • Good pressure recovery (less than 15% drop)
  • Reliable protection for reference meters, regardless of pressure or temperature changes
  • No costly meter failures due to fluid over-speed scenarios
  • Eliminates expensive redundant measuring devices
  • When used for secondary measurement, signals any problem that may arise with the primary meter
  • Manufactured for all meter type and available in a range of sizes
  • Eliminates the hazard of H2S venting by control valve systems in sour gas applications
  • Nozzles are manufactured to recognized industry standards, such as ASME/ANSI, or with a stepped throat which increases stability at critical conditions
  • Industry Round Robin data is available providing confidence levels associated with your choice of calibration facilities

Differential Measurement Nozzles

CPA offers flow nozzle elements to provide differential pressure measurement.


  • Multiple styles available including simple flow element, venturi nozzle with pressure taps, venturi meter tubes, or completely custom designs.
  • Many options of installation including welded, flanged, and insert style.
  • Flanged nozzles are compatible with ANSI, JIS, GRP, and many other flange standards.
  • Designed and manufactured to accepted standards such as ASME 3M, ASME 7M, ISO 5167 and ASME PTC6.
  • Customized configuration of pressure taps to suit any application.
  • Available calibration services through one of our test lab partners.