Flow Orifice / Nozzle: Reynolds Number Range 10^4-10^7

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 5167, ASME MFC-3M, DIN 1952

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Flow Orifice / Nozzle

Manufacturer profiles associated with Flow Orifice / Nozzle.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Flow Orifice / Nozzle