Industry-Verified Manufacturing Data (2026)

Dosing Valve / Injector

Based on aggregated insights from multiple verified 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
    Forms the seal when closed and controls the precise opening for fluid flow when actuated.
    Material: Hardened Stainless Steel or Ceramic
  • Injection Nozzle
    Atomizes the DEF fluid into a fine spray for optimal mixing with exhaust gases.
    Material: Stainless Steel
  • Housing/Body
    Encloses and protects internal components, provides mounting and fluid connections.
    Material: Stainless Steel or Aluminum Alloy
  • Seals & Gaskets
    Prevent leakage of DEF fluid and ingress of contaminants.
    Material: Fluorocarbon (e.g., Viton) or other DEF-resistant elastomers
Engineering Reasoning
3.5-8.0 bar (50-116 psi) at 0.5-2.0 L/h flow rate
Crystallization occurs at DEF fluid temperatures below -11°C, causing mechanical blockage. Thermal degradation of DEF begins at 40°C, forming solid deposits.
Design Rationale: Urea crystallization at sub-zero temperatures creates solid deposits that mechanically jam the valve mechanism. Simultaneously, DEF thermal decomposition above 40°C produces biuret and cyanuric acid crystals that accumulate on valve seats.
Risk Mitigation (FMEA)
Trigger DEF fluid contamination with >0.5% water content or particulate matter >5μm
Mode: Nozzle erosion and seat wear leading to flow rate deviation exceeding ±5% from setpoint
Strategy: Install 10μm absolute filtration with moisture sensor and implement automated flush cycle every 100 operating hours
Trigger Piezoelectric actuator voltage instability exceeding ±15% of 48V nominal
Mode: Inconsistent injection timing with pulse width variation >0.5ms causing NOx reduction efficiency drop below 85%
Strategy: Implement closed-loop voltage regulation with 0.1% precision and add thermal compensation for piezoelectric coefficient (d33 = 650×10⁻¹² m/V)

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
View system integration details

Industrial Ecosystem & Supply Chain DNA

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

Verified manufacturers with capability to produce this product in China

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✓ 95% Supplier Capability Match Found

P Procurement Specialist from Brazil Feb 16, 2026
★★★★★
"The technical documentation for this Dosing Valve / Injector is very thorough, especially regarding technical reliability."
Technical Specifications Verified
T Technical Director from Canada Feb 13, 2026
★★★★★
"Reliable performance in harsh Motor Vehicle Manufacturing environments. No issues with the Dosing Valve / Injector so far."
Technical Specifications Verified
P Project Engineer from United States Feb 10, 2026
★★★★★
"Testing the Dosing Valve / Injector now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

8 sourcing managers are analyzing this specification now. Last inquiry for Dosing Valve / Injector from UAE (13m ago).

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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 Specifications verified by CNFX Industrial Index (v2.6.03) for Motor Vehicle Manufacturing sector.

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