Editorial Technical Reference

Dosing Valve / Injector

This page explains how Dosing Valve / Injector is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision component that meters and injects DEF/AdBlue fluid into the exhaust stream of diesel engines to reduce NOx emissions.

Product Specifications

Technical details and manufacturing context for Dosing Valve / Injector

Definition
The dosing valve/injector is a critical component within the DEF/AdBlue injection system of modern diesel engines equipped with Selective Catalytic Reduction (SCR) technology. Its primary function is to receive pressurized DEF fluid from the tank and precisely meter, atomize, and inject it into the hot exhaust gas upstream of the SCR catalyst. This injection enables the chemical reaction that converts harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor, ensuring compliance with stringent emissions regulations. The valve operates under electronic control from the vehicle's Engine Control Unit (ECU). Upon receiving a signal, an internal solenoid or piezoelectric actuator opens, allowing pressurized DEF fluid to pass through a precision nozzle. The fluid is atomized into a fine spray upon injection into the exhaust stream. The timing, duration, and frequency of injection pulses are precisely calculated by the ECU based on engine load, exhaust temperature, and NOx sensor feedback to optimize the SCR reaction. This component is designed for use in motor vehicle manufacturing, specifically for diesel engines with SCR systems. It is a part-level component, not a complete system. The materials used include stainless steel for the body and internal parts, engineering plastics/polymers for seals and insulators, and copper alloy for solenoid windings. Key parameters include an operating pressure of 1.0–1.6 MPa, a flow rate of 0.5–5.0 L/min, a response time of ≤50 ms, dosing accuracy of ±2.5%, operating voltage of 12–24 V DC (ISO 16750-2), power consumption of 15–30 W, operating temperature of -40–85 °C (ISO 16750-4), fluid temperature of -10–50 °C, ingress protection of IP65–IP69K (IEC 60529), body material of 316L (ASTM A240), coil insulation class H (IEC 60085), and weight of 0.3–0.8 kg. These values are reference ranges and must be verified for the specific model and application. The component is not certified or compliant solely by listing these standards; they serve as procurement and verification references. For selection, consider engine size, dosing demand, and environmental conditions. Interfaces include electrical connectors and fluid ports. Verification questions should address actual operating conditions and compliance with relevant standards. Maintenance signals include reduced dosing accuracy or response time. Failure boundaries include operating outside specified pressure, temperature, or voltage ranges.
Working Principle
The dosing valve/injector is electronically controlled by the Engine Control Unit (ECU). When the ECU sends a signal, an internal solenoid or piezoelectric actuator opens, allowing pressurized DEF fluid to flow through a precision nozzle. The fluid is atomized into a fine spray as it enters the exhaust stream. The ECU calculates the timing, duration, and frequency of injection pulses based on engine load, exhaust temperature, and NOx sensor feedback to optimize the SCR reaction. This precise dosing ensures efficient NOx reduction while minimizing DEF consumption.
Common Materials
Stainless Steel (body & internal parts), Engineering Plastics/Polymers (seals & insulators), Copper Alloy (solenoid windings)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Flow Rate0.5–5.0 L/minMatches engine size and dosing demand
Response Time≤50 msFast response for precise dosing
Dosing Accuracy±2.5 %Ensures emission compliance
Operating Voltage12–24 V DCVehicle electrical systemISO 16750-2
Power Consumption15–30 WAt nominal voltage
Operating Temperature-40–85 °CEngine compartment environmentISO 16750-4
Fluid Temperature-10–50 °CDEF freezing point -11°C
Ingress ProtectionIP65–IP69KHigh-pressure washdownIEC 60529
Body Material316LCorrosion resistance to DEFASTM A240
Coil Insulation ClassH180°C thermal ratingIEC 60085
Weight0.3–0.8 kgCompact for packaging

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

Components / BOM
  • Solenoid/Piezoelectric Actuator
    Converts electrical signals from the ECU into mechanical movement to open and close the valve.
    Material: Copper Alloy, Ferromagnetic Core, Piezoelectric Ceramics
  • Valve Seat & Needle Part
    Forms the seal when closed and controls the precise opening for fluid flow when actuated.
    Material: Hardened Stainless Steel or Ceramic
  • Injection Nozzle Part
    Atomizes the DEF fluid into a fine spray for optimal mixing with exhaust gases.
    Material: Stainless Steel
  • Housing/Body Part
    Encloses and protects internal components, provides mounting and fluid connections.
    Material: Stainless Steel or Aluminum Alloy
  • Seals & Gaskets Part
    Prevent leakage of DEF fluid and ingress of contaminants.
    Material: Fluorocarbon (e.g., Viton) or other DEF-resistant elastomers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Dosing Valve / Injector.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (inlet), 4-8 bar injection pressure
flow rate: 0.5-10 L/h (typical DEF dosing range)
temperature: -40°C to 85°C (operating), -40°C to 120°C (storage)
slurry concentration: Not applicable - DEF/AdBlue is 32.5% urea solution, must be free of particulates > 10 μm
Media Compatibility
✓ Aqueous urea solution (DEF/AdBlue) ✓ Deionized water for cleaning/flushing ✓ Compatible with stainless steel 316L and PTFE seals
Unsuitable: Hydrocarbon-based fluids, corrosive chemicals, or abrasive slurries
Sizing Data Required
  • Required DEF flow rate (L/h) based on engine NOx reduction targets
  • Available electrical supply voltage and current (typically 12V or 24V DC)
  • Exhaust backpressure at injection point (bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seat and needle wear
Cause: Abrasive particles in the fluid causing erosion, improper material selection for the application, or high cycle fatigue from frequent operation
Cavitation damage
Cause: Excessive pressure drop across the valve, improper sizing leading to vapor bubble formation and collapse, or operation near the vapor pressure of the fluid
Maintenance Indicators
  • Irregular spray pattern or dripping from the nozzle when closed
  • Audible hissing or chattering during operation indicating improper seating or cavitation
Engineering Tips
  • Install proper filtration upstream (typically 100 microns or finer depending on application) to remove abrasive particles and protect sealing surfaces
  • Maintain operating pressure at least 10-15% above the fluid's vapor pressure and ensure proper valve sizing to prevent cavitation damage

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 15848-1:2015 (Leakage classification for valve stem seals) ANSI/FCI 70-2:2013 (Control valve seat leakage) DIN EN 1267:2012 (Industrial valves - Test of flow resistance using water as test fluid)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Seat flatness: 0.05mm
Quality Inspection
  • Hydrostatic pressure test (per ISO 5208)
  • Dimensional verification with CMM (Coordinate Measuring Machine)

Manufacturers of Dosing Valve / Injector

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

AVM Extraordinary Intelligent Control (Zhejiang) Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Rotary Dosing Valve”
View source page ↗ avmfluid.com · checked 2026-08-27

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the operating pressure range for this dosing valve?

The reference operating pressure range is 1.0–1.6 MPa. However, you must verify the exact range for your specific model and application with the manufacturer.

What materials are used in the construction?

The body and internal parts are typically stainless steel, seals and insulators are engineering plastics/polymers, and solenoid windings are copper alloy. The body material is listed as 316L per ASTM A240, but confirm with the supplier.

What is the response time and dosing accuracy?

The response time is ≤50 ms, and dosing accuracy is ±2.5%. These are reference values; actual performance may vary by model and operating conditions.

What environmental conditions can it withstand?

The operating temperature range is -40 to 85 °C (ISO 16750-4), and fluid temperature is -10 to 50 °C. Ingress protection is IP65–IP69K (IEC 60529). Always verify these ratings for your specific application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.
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