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ISO Calibrated Orifice Plates for Test Injectors

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Precision calibrated orifice plates designed for ISO test injectors (ISO 7440 / ISO 14681).
Available in diameters from 0.4 mm to 0.8 mm, they ensure repeatable, standardized flow conditions during diesel pump calibration.

Calibrated orifice plates are precision reference elements used in ISO 7440 and ISO 14681 test injectors.

They define the flow-rate reference in the injector assembly, ensuring identical test conditions and comparable pump-delivery results worldwide.

Each plate corresponds to a Bosch reference and a nominal bore diameter between 0.4 mm and 0.8 mm.

Key Benefits

  • Guaranteed ISO compliance with standards 7440-2 and 14681.

  • Standardized pump test results – same flow data across different benches.

  • High-precision machining ensures repeatability and flow stability.

  • Easy replacement and traceability – engraved identification per ISO.

  • Durable stainless-steel design for long service life under calibration fluids (ISO 4113).

Key Features

  • Product family: 84.50.V*

  • Range: Ø 0.4 mm – 0.8 mm

  • Mounting: fits ISO 7440 / 14681 calibrating injectors

  • Application: with Marbed test nozzles 84.40.987 / 990 / 991 / 999 etc.

  • Material: hardened and polished steel, corrosion-resistant

  • Compliance: ISO 7440-2 (flow measurement of orifice plates)

  • Standard fluid: ISO 4113 calibration oil

  • Max flow deviation: < ±1 % within calibrated range

Technical Data (Variants)

VariantØ Hole (mm)Bosch Ref.ISO ReferenceTypical Use
84.50.V40.4 mm1 680 103 094ISO 7440 / 14681Low-flow calibration
84.50.V50.5 mm1 680 103 095ISO 7440 / 14681Standard flow
84.50.V60.6 mm1 680 103 096ISO 7440 / 14681Mid-range flow
84.50.V70.7 mm1 680 103 097ISO 7440 / 14681High-flow calibration
84.50.V80.8 mm1 680 103 098ISO 7440 / 14681Maximum flow capacity

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  • Nominal diameter

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Contact Us
Marbed 84.50.V series orifice plates are reference components for ISO test injectors.
Manufactured to ISO 7440-2 tolerances, they define the fuel-flow reference during pump testing and ensure consistent results across benches.
Each plate features a single precision-drilled hole (Ø 0.4 – 0.8 mm) for controlled delivery under ISO 7440 / 14681 test conditions.

FAQ

Are these orifice plates for engine use?

No. They are reference components used only in ISO test injectors on calibration benches.

How are flow values determined?

Each plate’s bore diameter defines the reference flow per ISO 7440-2; flow is verified using calibration oil ISO 4113.

When should an orifice plate be replaced?

Follow ISO 4008-3 Annex B maintenance intervals or replace when flow deviation exceeds tolerance.

Are these compatible with Marbed test injectors?

Yes, with ISO 7440 / 14681 injectors (Types II, III, VII, IX and equivalents).

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