SINOTRUK truck Urea Nozzle WG9925561033

Description

HOWO truck, HOHAN truck, SINOTRUK TRUCK Urea Nozzle WG9925561033

Core Functions of Urea Nozzle WG9925561033：

As a key executive component of the Selective Catalytic Reduction (SCR) system, the urea nozzle WG9925561033 performs the following core functions:

1. Precise Urea Solution Injection

Serving as the “precision injector” of the urea system, the nozzle accurately controls the dosage and timing of urea water solution (32.5% concentration AdBlue) sprayed into the exhaust pipe based on engine operating conditions. It atomizes the urea solution into fine particles under high pressure and evenly distributes them into the exhaust flow, ensuring thorough and uniform mixing with the exhaust gas for optimal reaction efficiency.

2. Exhaust Pollution Reduction via Chemical Reaction

The injected urea solution undergoes a two-stage chemical reaction with nitrogen oxides (NOx) in the exhaust:

• Stage 1: Urea decomposes into ammonia (NH₃) and carbon dioxide (CO₂) under high-temperature conditions in the exhaust pipe.
• Stage 2: Ammonia reacts with NOx within the SCR catalytic converter, producing harmless nitrogen (N₂) and water (H₂O), which are then released into the atmosphere.
  This process significantly reduces NOx emissions, enabling vehicles to comply with strict emission standards such as China VI and Euro VI.

Working Principle of Urea Nozzle WG9925561033

The vehicle’s Electronic Control Unit (ECU) serves as the system’s command center, orchestrating the urea injection process through the following coordinated stages:

1. Urea Nozzle WG9925561033 Dynamic Injection Volume Calculation

The ECU continuously monitors real-time engine parameters (e.g., rotational speed, load torque) and employs embedded algorithms to compute the precise urea injection volume. This calculation ensures the optimal ratio of urea to nitrogen oxides (NOx) in the exhaust, tailored to the engine’s operational state.

2. Pressurization and Delivery System

Upon receiving instructions from the ECU, the urea pump pressurizes the 32.5% AdBlue solution to a specified pressure range (typically 5-8 bar), transforming it into a high-pressure fluid. This pressurized urea is then delivered through dedicated pipelines to the nozzle, establishing the hydraulic conditions necessary for atomization.

3. Precision Atomization Control

The nozzle acts as the final execution component, where a solenoid valve regulates both injection duration and pressure based on ECU signals:

• When the solenoid valve opens, the high-pressure urea solution passes through precision-engineered orifices, breaking down into micron-scale droplets (20-50 μm) through hydraulic atomization.

These fine particles are evenly sprayed into the exhaust stream, where turbulent mixing with hot exhaust gases (300-500°C) ensures complete vaporization and uniform distribution, priming the urea for subsequent SCR catalytic reactions.

Urea Nozzle WG9925561033 Fault phenomenon:

Blockage: Urea crystallization or impurity deposition causes nozzle spray hole blockage, which is manifested as excessive exhaust emissions, fault light on, and reduced power. Leakage: Aging of the seal or damage to the nozzle body can lead to the leakage of urea solution, which may corrode the exhaust pipe or cause abnormal urea consumption.