Flow Restriction Element: Orifice Diameter 0.5 mm to 25 mm

Component Specifications

Definition

A flow restriction element is a calibrated device designed to limit the volumetric or mass flow rate of fluids (liquids or gases) within a piping or ducting system. It operates by introducing a specific pressure drop through geometric constriction, porous media, or variable orifice mechanisms, ensuring precise flow control for process optimization, safety, and equipment protection.

Working Principle

Operates based on Bernoulli's principle and the continuity equation, where a reduction in cross-sectional area increases fluid velocity and decreases static pressure, creating a controlled pressure differential that limits flow. Types include fixed orifices, needle valves, venturis, and porous inserts, each providing specific flow-resistance characteristics.

Materials

Typically stainless steel (e.g., AISI 316L), brass, aluminum alloys, or engineered plastics (PTFE, PEEK) for corrosion resistance. Material selection depends on fluid compatibility, pressure ratings (up to 6000 psi), and temperature ranges (-50°C to 400°C).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±2% of set point
Connection Type	NPT, BSP, SAE, Flanged
Pressure Rating	Up to 6000 psi
Orifice Diameter	0.5 mm to 25 mm
Flow Coefficient (Cv)	0.01 to 10

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, DIN 1952, ASME B16.5

Parent Products

This component is used in the following industrial products

Flow Control Mechanism

A mechanical device that regulates the rate, direction, or pressure of fluid flow within an industrial system.

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Engineering Analysis

Risks & Mitigation

Cavitation at high pressure drops
Erosion from abrasive fluids
Clogging in dirty media
Material incompatibility causing corrosion

FMEA Triads

Trigger: Orifice erosion from particulate-laden fluids
Failure: Increased flow rate beyond design limits
Mitigation: Install upstream filters; use hardened materials (e.g., tungsten carbide); implement regular inspection schedules

Trigger: Thermal expansion mismatch in high-temperature applications
Failure: Leakage or structural failure
Mitigation: Design with expansion joints; select materials with similar thermal coefficients; use temperature compensation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm on orifice diameter; ±2% on Cv value

Test Method

Flow calibration per ISO 5167 using water or air; pressure testing per ASME B16.34; material certification to ASTM standards

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Flow Restriction Element

Manufacturer profiles associated with Flow Restriction Element.

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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 a flow restriction element and a control valve?

A flow restriction element provides fixed or adjustable but non-automated flow limitation, while a control valve dynamically modulates flow based on external signals (e.g., pneumatic, electric) for process control.

How do you calculate the pressure drop across a flow restriction element?

Using the Darcy-Weisbach equation or empirical formulas based on flow coefficient (Cv), fluid density, viscosity, and orifice geometry, often referenced to ISO 5167 standards.

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 Restriction Element