Woodward 9905-001 Electro-hydraulic Actuator

Description

Woodward 9905-001 Electro-hydraulic Actuator

Product Dimensions：

Woodward is a global leader in the design and manufacture of energy control and optimization solutions. Their Electro-Hydraulic Actuators (EHAs) are critical components used primarily in steam and gas turbine control systems to position fuel valves or steam valves with high precision and reliability.

1. Product Description

Woodward Electro-Hydraulic Actuators serve as the interface between an electronic control system (which provides a low-power demand signal) and a hydraulic system (which provides the high-force mechanical output).

These actuators typically convert a 4–20 mA or a specialized digital signal into a proportional hydraulic output. Many models, such as the VariStroke or CPC-II, feature integrated electronics to handle position control internally, reducing the need for external servo amplifiers.

2. Technical Parameters (Typical)

While specifications vary by specific model (e.g., CPC-II, VariStroke, or TG-Series), general parameters include:

3. Product Advantages

• High Precision: Advanced pilot valve technology ensures minimal hysteresis and high repeatability for stable turbine speed/load control.

• Contamination Resistance: Woodward actuators (like the CPC-II) are designed with “dirt-tolerant” rotary valves, allowing them to operate reliably even with standard industrial hydraulic fluids.

• Integrated Electronics: Modern units include onboard microprocessors for self-diagnostics, calibration, and “plug-and-play” installation.

• Redundancy Options: Available in redundant configurations to prevent single-point failures in critical power generation environments.

• High Force-to-Size Ratio: Utilizes hydraulic power to move massive valves that electric-only actuators cannot handle efficiently.

4. Key Applications

Woodward EHAs are the industry standard for:

• Steam Turbines: Positioning inlet header valves, extraction valves, and trip-and-throttle valves.

• Gas Turbines: Controlling fuel gas valves and Variable Inlet Guide Vanes (VIGV).

• Hydro Turbines: Controlling wicket gate positioning.

• Process Industry: Large-scale compressor surge control and industrial engine valve actuation.

5. Important Considerations (Precautions)

• Fluid Cleanliness: Although designed to be robust, maintaining hydraulic oil within ISO cleanliness standards (e.g., ISO 4406 16/14/11) significantly extends the life of the internal seals and pilot valves.

• Calibration: Ensure the actuator is null-balanced and calibrated to the specific stroke of the valve during commissioning.

• Heat Dissipation: Ensure adequate cooling for hydraulic lines if the actuator is mounted in high-ambient-temperature zones near turbine casings.

• Seal Compatibility: Always verify that the seal material (Viton, Nitrile, etc.) is compatible with the specific hydraulic fluid (Mineral oil vs. Fire-resistant fluid like Fyrquel).

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