---
title: "Dosing Valve / Injector"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DOSING_VALVE_INJECTOR"
  data_integrity_hash: "900fccc3cee6061e07860ac78db28bad"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:DOSING_VALVE_INJECTOR"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/dosing-valve-injector.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/dosing-valve-injector"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "3.5-8.0 bar (50-116 psi) at 0.5-2.0 L/h flow rate"
    unit: "ml/min"
engineering_limits:
  max_safe_operating_point:
    value: 11
    unit: "°C"
    consequence: "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."
fmea_matrix_quantitative:
  - node_1:
      trigger: "DEF fluid contamination with &gt;0.5% water content or particulate matter &gt;5μm"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10μm absolute filtration with moisture sensor and implement automated flush cycle every 100 operating hours"
  - node_2:
      trigger: "Piezoelectric actuator voltage instability exceeding ±15% of 48V nominal"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement closed-loop voltage regulation with 0.1% precision and add thermal compensation for piezoelectric coefficient (d33 = 650×10⁻¹² m/V)"
bom_nodes:
  solenoidpiezoelectric-actuator:
    type: "part"
    urn: "URN:CNFX:ME:SOLENOIDPIEZOELECTRIC_ACTUATOR"
    interface_type: "physical-logic-coupled"
  valve-seat-needle:
    type: "component"
    urn: "URN:CNFX:ME:VALVE_SEAT_NEEDLE"
    interface_type: "physical-logic-coupled"
  injection-nozzle:
    type: "component"
    urn: "URN:CNFX:ME:INJECTION_NOZZLE"
    interface_type: "physical-logic-coupled"
  housingbody:
    type: "component"
    urn: "URN:CNFX:ME:HOUSINGBODY"
    interface_type: "physical-logic-coupled"
  seals-gaskets:
    type: "component"
    urn: "URN:CNFX:ME:SEALS_GASKETS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 15848-1:2015 (LEAKAGE CLASSIFICATION FOR VALVE STEM SEALS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/FCI 70-2:2013 (CONTROL VALVE SEAT LEAKAGE)"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 1267:2012 (INDUSTRIAL VALVES - TEST OF FLOW RESISTANCE USING WATER AS TEST FLUID)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/dosing-valve-injector.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "d879a1064b6f89d15a1f791dd2e3be7c6a328f588c617ff4165890d9e6eac751"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Dosing Valve / Injector

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **3.5-8.0 bar (50-116 psi) at 0.5-2.0 L/h flow rate**. Failure boundary: **Crystallization occurs at DEF fluid temperatures below -11°C, causing mechanical blockage. Thermal degradation of DEF begins at 40°C, forming solid deposits.**, Mechanism: **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.**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| DEF fluid contamination with &gt;0.5% water content or particulate matter &gt;5μm | 8 | Nozzle erosion and seat wear leading to flow rate deviation exceeding ±5% from setpoint | Install 10μm absolute filtration with moisture sensor and implement automated flush cycle every 100 operating hours |
| Piezoelectric actuator voltage instability exceeding ±15% of 48V nominal | 8 | Inconsistent injection timing with pulse width variation &gt;0.5ms causing NOx reduction efficiency drop below 85% | Implement closed-loop voltage regulation with 0.1% precision and add thermal compensation for piezoelectric coefficient (d33 = 650×10⁻¹² m/V) |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | ml/min | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Solenoid/Piezoelectric Actuator](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/solenoidpiezoelectric-actuator.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **DEF/AdBlue Storage Tank**, **High-Precision Metering Pump**, **Fluid Filtration System**  
**Downstream Applications**: Diesel Exhaust Fluid (DEF) Injection Systems, Selective Catalytic Reduction (SCR) Systems, Heavy-Duty Diesel Engine Assemblies  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of this dosing valve in motor vehicle manufacturing?
**A**: 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.

### Q: Why is stainless steel used for the body and internal parts?
**A**: Stainless steel provides excellent corrosion resistance against DEF/AdBlue fluid, ensures durability in harsh automotive environments, and maintains precision tolerances for reliable metering performance.

### Q: How does the solenoid actuator work in this dosing valve?
**A**: 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.

## 6. Manufacturing Compliance
- 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)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Dosing Valve / Injector](https://cnfx.com/industry/motor-vehicle-manufacturing/product/dosing-valve-injector)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: DOSING_VALVE_INJECTOR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 5573c94c
