What is a Sonic Nozzle?
A “sonic nozzle” (also known as “Critical Flow Venturi” or “Critical Flow Nozzle”) is a flow meter that can be used as a calibration standard for gas flow meters or any flow measurement device.
By design, sonic nozzles are a constant volumetric flow meter. However, with the use of a regulated pressure supply, the sonic nozzle becomes a “state-of-the-art” mass flow meter. Considering both the divergent section design and the flow rate, sonic nozzles may operate with an exit pressure as high as 90% of the inlet pressure.
Advantages of Sonic Nozzles
- Internationally Recognized Flow Meters
- Mass Flow Varies Linearly with Inlet Pressure
- Minimum Upstream Piping Required
- Long Term Accuracy
- Excellent Repeatability
- No Moving Parts
- Differential Pressure Measurement Not Required
- Flow Rate Is Not Affected by Downstream Flow Disturbances
- Mass Flow is Constant with Varying Downstream Pressure
Common Sonic Nozzle Applications
- 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
- Flow Limiting
- Over Speed Protection of Gas Flow Meters
Sonic Nozzles Supplied by DP-Flow Ltd
We supply a wide variety of sonic nozzles for use as standalone flow meters and as components in complete systems.