Throat: Temperature range -40°C to 200°C, Beta ratio 0.25-0.75

Component Specifications

Definition

In a Venturi nozzle, the throat is the constricted cross-sectional area between the converging inlet and diverging outlet sections. This critical component creates a pressure differential by accelerating fluid flow, enabling measurement, mixing, or suction applications. The throat's precise geometry determines flow characteristics, with diameter-to-length ratios optimized for specific Reynolds numbers and pressure recovery.

Working Principle

The throat operates on Bernoulli's principle and continuity equation: as fluid enters the converging section, velocity increases while static pressure decreases, reaching extremes at the throat minimum area. This creates a pressure drop (ΔP) proportional to flow rate squared, enabling flow measurement via pressure taps. The throat's streamlined design minimizes turbulence and energy losses while maintaining laminar or transitional flow regimes.

Materials

Stainless steel (AISI 304/316), brass (C36000), aluminum (6061-T6), or engineered plastics (PTFE, PEEK) depending on fluid compatibility. Surface finish: Ra ≤ 0.8 μm for metallic throats, ≤ 1.6 μm for polymer throats. Corrosion resistance per ASTM A240/A276 standards.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Beta Ratio	0.25-0.75
Pressure Rating	0-1000 psi
Surface Roughness	Ra 0.4-1.6 μm
Temperature Range	-40°C to 200°C
Diameter Tolerance	±0.05 mm
Flow Coefficient (Cv)	0.5-2.5

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

Venturi Nozzle

A specialized nozzle that uses the Venturi effect to create vacuum pressure by accelerating fluid flow through a constricted section.

View Product Details

Ejector Nozzle

A precision component in vacuum generators/valves that accelerates fluid flow to create suction.

View Product Details

Engineering Analysis

Risks & Mitigation

Cavitation at high flow rates
Erosion from abrasive fluids
Clogging from particulate matter
Thermal expansion mismatch

FMEA Triads

Trigger: Material erosion from abrasive fluids
Failure: Increased throat diameter altering flow coefficients
Mitigation: Use hardened materials (stellite coating), install upstream filters, implement regular dimensional inspections

Trigger: Improper installation alignment
Failure: Asymmetric flow causing measurement errors
Mitigation: Use alignment fixtures during installation, verify with laser alignment tools, follow manufacturer torque specifications

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m, diameter tolerance ±0.05 mm, concentricity within 0.1 mm TIR

Test Method

Flow calibration per ISO 5167 using gravimetric or master meter methods, pressure testing at 1.5x rated pressure, dimensional verification with CMM

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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

Supplier transparency

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Manufacturers of Throat

Manufacturer profiles associated with Throat.

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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

How does throat diameter affect Venturi nozzle performance?

Throat diameter directly determines flow rate capacity and pressure drop. Smaller diameters increase velocity and pressure differential but may cause cavitation at high flows. Optimal diameter balances measurement sensitivity with acceptable pressure loss.

What maintenance does the throat require?

Regular inspection for erosion, corrosion, or deposit buildup. Cleaning with compatible solvents to maintain surface finish. Calibration verification every 6-12 months depending on service conditions.

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.

Throat