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Woodward 9902-439
Product Name: VG Electro-hydraulic Controller (P29) – 3055 Hydraulic Pump / Servo Valve Assembly
Product Introduction: The 9902-439 is a Woodward hydraulic pump and servo valve assembly configured for GE LM2500 series gas turbines. It forms part of the 3055 Hydraulic Pump/Servo Valve Assembly family, where the hydraulic pump is a positive-displacement gear pump supplying hydraulic pressure to the fuel metering valve/actuator (FMV/A) assembly and the variable stator vane (VSV) servo valve and actuator.
Detailed content
Technical Specifications:
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Turbine Application: GE LM2500
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Assembly Position: P29
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Pump Type: Positive-displacement gear pump
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Companion Servo Valve: 9902-412 (P22)
Functional Features:
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Provides hydraulic pressure to FMV/A and VSV servo valve/actuator
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Integrates with Woodward 3055 hydraulic pump/servo valve assemblies
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Designed for industrial gas turbine applications
Application Scenarios: GE LM2500 gas turbine fuel metering and variable stator vane control systems.
Working Principle: The hydraulic pump generates pressurized hydraulic fluid that drives the fuel metering valve/actuator and VSV actuator, enabling precise control of fuel flow and compressor vane geometry.
Installation Requirements: Install in accordance with Woodward manual 26212 and associated turbine-specific documentation. Verify latest manual revision status before installation.
Usage Notes: Read all publications pertaining to the work before installing, operating, or servicing. Follow all plant and safety instructions. The turbine must be equipped with an independent overspeed shutdown device.
