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Sonic Nozzles

Sonic Nozzles

Cox Series 220 Sonic Nozzles are mass flow instruments designed for the accurate measurement and control of gas flow. The internal design of the nozzle consists of a circular arc that leads to the minimum throat area. Tangent to the circular arc on the exhaust side is a conical diffuser section. Common applications of the sonic nozzle include use as a calibration standard, gas flow meter, flow controller and flow limiting device.


0.11....1 in.
Flow Range
0.04....10,000 scfm
Pressure Range
Up to 3000 PSI
(of reading) ±0.5 %

Additional Specifications

Application Examples

Secondary Gas Flow Standardsī‚ˇ
Calibration of Gas Flow Meters
Gas Flow Metering
Calibration of Turbine Engine Component Gas Passages
Calibration of Automotive Component Air Passages
Measurement of Automotive Induction Air
Automotive Emissions Testing
Compressor Discharge Capacity Tests
Valve CV Tests

Aviation & Aerospace
Test Equipment & Services

Product Resources

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Parts, Accessories & Other Options

Cox Flow Straighteners

Cox Flow Straighteners More Info Less Info

Cox Flow Straighteners are recommended for use with turbine flow meters to prevent false readings resulting from fluid swirl. Installed upstream and downstream of a turbine meter, they are designed to reduce liquid rotation by means of a six-vane swirl eliminator and a straight runs of tubing. (The swirl eliminator is not used on sizes below 1/2")

Cox Flow Straighteners Product Data Sheet (CXX-DS-00181-EN)
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