Structured Manufacturing Data (2026)

Dosing Valve / Injector

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Dosing Valve / Injector used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Dosing Valve / Injector is characterized by the integration of Solenoid/Piezoelectric Actuator and Valve Seat & Needle. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel (body & internal parts) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

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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.
Working Principle
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.
Common Materials
Stainless Steel (body & internal parts), Engineering Plastics/Polymers (seals & insulators), Copper Alloy (solenoid windings)
Technical Parameters
  • Maximum dosing/injection flow rate capacity. (ml/min) Standard Spec
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.

DEF Injector AdBlue Valve SCR Doser DEF dosing valve for diesel trucks AdBlue injector NOx reduction precision dosing valve automotive stainless steel DEF injector solenoid actuator dosing valve

Applied To / Applications

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

DEF/AdBlue Injection System
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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

Compliance & Manufacturing Standards

Reference 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)
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)

Factories Producing Dosing Valve / Injector

Manufacturer profiles with relevant production capability in China

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

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of this dosing valve in motor vehicle manufacturing?

This dosing valve precisely meters and injects DEF/AdBlue fluid into the exhaust stream of diesel engines to reduce harmful NOx emissions, helping vehicles meet environmental regulations.

Why is stainless steel used for the body and internal parts?

Stainless steel provides excellent corrosion resistance against DEF/AdBlue fluid, ensures durability in harsh automotive environments, and maintains precision tolerances for reliable metering performance.

How does the solenoid actuator work in this dosing valve?

The solenoid actuator, with copper alloy windings, provides precise electronic control of the valve opening and closing, enabling accurate fluid metering based on engine operating conditions and emission requirements.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Motor Vehicle Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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