INDUSTRY COMPONENT

Flow Orifice / Nozzle

Precision-engineered flow restriction device for accurate fluid measurement and control in industrial systems.

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Component Specifications

Definition
A flow orifice/nozzle is a calibrated restriction device installed in pipelines to create a measurable pressure drop proportional to flow rate. It consists of a precisely machined opening (orifice plate) or convergent-divergent nozzle that accelerates fluid flow, enabling calculation of volumetric or mass flow using Bernoulli's principle and continuity equations. These devices are fundamental components in flow metering systems, process control loops, and pressure regulation applications across multiple industries.
Working Principle
Operates on the differential pressure principle: as fluid passes through the restricted opening, velocity increases and pressure decreases according to Bernoulli's equation. The pressure difference (ΔP) across the device is measured and correlated to flow rate using standardized flow equations (ISO 5167). For nozzles, the convergent shape minimizes energy losses and vena contracta effects compared to sharp-edged orifices.
Materials
Stainless steel (304/316L), Hastelloy, Monel, titanium, or carbon steel with corrosion-resistant coatings. Selection depends on fluid compatibility, temperature range (-200°C to 800°C), pressure rating (up to ANSI Class 2500), and erosion resistance requirements.
Technical Parameters
  • Accuracy ±0.5-2% of actual flow
  • Line Size DN15 to DN1200
  • Pressure Loss 30-90% of differential pressure
  • Reynolds Number Range 10^4-10^7
  • Bore Diameter Ratio (β) 0.2-0.75
Standards
ISO 5167, ASME MFC-3M, DIN 1952

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Flow Orifice / Nozzle.

flow orifice flow nozzle differential pressure flow meter ISO 5167 process control fluid measurement industrial flow control Flow Orifice / Nozzle Flow Orifice / Nozzle in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Flow Control Device

A device used to regulate, direct, or control the flow of molten metal within a distribution system.

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Engineering Analysis

Risks & Mitigation
  • Erosion/corrosion of bore edges
  • Upstream flow disturbance affecting accuracy
  • Condensation in impulse lines causing measurement errors
  • Over-range pressure damage
FMEA Triads
Trigger: Solid particle erosion in abrasive fluids
Failure: Increased bore diameter changing β ratio
Mitigation: Use hardened materials, regular calibration, and upstream filtration
Trigger: Improper installation alignment
Failure: Asymmetric flow profile and measurement errors
Mitigation: Follow ISO 5167 installation requirements (straight pipe lengths)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Bore diameter tolerance ±0.001D for β≤0.67, surface roughness Ra≤10^-4D
Test Method
Calibration per ISO 5167 using gravimetric or master meter methods, dimensional verification with coordinate measuring machines

Buyer Feedback

★★★★☆ 4.5 / 5.0 (36 reviews)

"Testing the Flow Orifice / Nozzle now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Flow Orifice / Nozzle meets all ISO standards."

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Frequently Asked Questions

What is the difference between an orifice plate and a flow nozzle?

Orifice plates have sharp-edged openings causing significant pressure loss and vena contracta, while nozzles have smooth convergent profiles that reduce permanent pressure loss and provide better accuracy for high-velocity flows.

How do you calculate flow rate using an orifice/nozzle?

Flow rate (Q) is calculated using Q = C × A × √(2ΔP/ρ), where C is discharge coefficient, A is flow area, ΔP is differential pressure, and ρ is fluid density. Coefficients are standardized in ISO 5167.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Flow Liner Flow Restriction Element