SFG240X159D163 Servo Valve for HU26044-222G Axial Fan

I. Product Overview

The SFG240X159D163 Axial Fan Servo Valve is a high-performance, two-stage electro-hydraulic servo valve. It features a jet-pipe design, which offers superior anti-contamination properties compared to nozzle-flapper structures, making it ideal for the complex operating conditions of power plants.

As a core component of the HU26044-222G axial fan hydraulic control system, this valve converts electrical control signals from the Distributed Control System (DCS) into precise hydraulic flow and pressure. This drive regulates the hydraulic cylinder, which in turn adjusts the pitch of the fan blades via linkage components (e.g., TY96010 and TY98010), ensuring an optimal match between fan airflow and boiler combustion requirements.

One-Stop Spare Parts Solution

We provide the SFG240X159D163 manufactured to strict original equipment manufacturer (OEM) technical standards. To minimize downtime and ensure seamless maintenance, we offer a comprehensive suite of compatible consumables and related models:

II. Technical Features & Advantages

1. Two-Stage Jet-Pipe Structure

The jet-pipe design provides a more robust and reliable alternative to nozzle-flapper valves.

• Contamination Resistance: The larger internal clearances allow for higher tolerance to fluid impurities, significantly extending the service life in power plant environments.

• High Response Speed: Achieves millisecond-level response times, ensuring real-time blade pitch adjustment and stable airflow.

2. Flexible Signal Adaptation

The valve is designed for seamless integration with modern DCS platforms without requiring additional signal conversion modules.

3. Rigorous Oil Cleanliness Standards

To ensure long-term stability and prevent spool sticking or lag, the valve operates under strict oil quality requirements:

• Standard: ISO 4406 Class $\geq 17/15/12$.

• Benefit: Quantifiable control of particles ($\geq 4\mu\text{m}$, $\geq 6\mu\text{m}$, and $\geq 14\mu\text{m}$) prevents channel blockage and mechanical wear.

4. Seamless OEM Compatibility

Designed specifically for the HU26044-222G fan, this valve allows for "plug-and-play" replacement. It requires no structural modifications, ensuring that fan performance (accuracy and response speed) is restored to original factory standards immediately after installation.

III. Application Scenarios

1. Routine Maintenance and Overhaul

During scheduled outages, the SFG240X159D163 is used to replace aged units that show increased hysteresis or leakage. Replacing the valve alongside its gaskets and scraper rings ensures the fan maintains peak energy efficiency.

2. Emergency Repair and Troubleshooting

In the event of blade pitch sticking or excessive airflow fluctuations—often caused by oil contamination or seal failure—the SFG240X159D163 serves as the critical "hot-swap" component.

Case Study: A power plant's induced draft fan experienced furnace pressure fluctuations due to servo valve sticking. By replacing the valve and the U236D03 bearings, the system was restored to full operation within 4 hours, preventing a costly unplanned shutdown.

3. System Upgrades and Retrofitting

For older power units, the SFG240X159D163 is an excellent upgrade for aging servo systems. Its superior anti-contamination and precise control characteristics help older fans adapt to modern grid-load demands, reducing overall O&M costs.

HKZX-2026-01-26