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Woodward 9902-364

Product Name:​ GE LM6000 Gas Turbine Hydraulic Control Unit (HCU)
Product Introduction:​ The 9902-364 is a Woodward hydraulic control unit designed for the GE LM6000 aeroderivative gas turbine. Used in conjunction with the Woodward NetCon 5000 Digital Control System, it controls variable-geometry actuator positions in the compressor stage. The HCU is dual-channel and contains three variable-geometry servovalves (torque motor servovalve + pilot valve), forming the core hydraulic component of the LM6000 engine package.
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Detailed content

Technical Specifications:
  • Application: GE LM6000 PC / PF / SPRINT series
  • Hydraulic fluid: MIL-L-23699 or MIL-L-7808
  • Maximum supply flow: 167 L/min (44 US gal/min) at 100% engine speed
  • Maximum supply pressure: 8619 kPa (1250 psig); nominal regulated pressure 8274 kPa (1200 psi) above return
  • Normal return pressure: 690 kPa (100 psig)
  • Normal ambient temperature: –7 to +66 °C (–20 to +150 °F)
  • Extreme ambient temperature: –40 to +121 °C (≤ 2% of total service life)
  • Dry weight: 27 kg (60 lbs)
  • Channels: Dual-channel (2 channel)
  • Electrical interface: Dual electrical connectors per coil; three-coil redundant torque motor servovalve
  • Major subassemblies: Pressure Regulator Manifold, Servovalve Assembly
Functional Features:​ Dual-channel redundant design for enhanced system reliability; three-coil redundant torque motor servovalve against single-point failure; independent oil filter and rod/head port strainer for easy maintenance; integrated test interface for convenient online inspection; seamless integration with LM6000 turbine control system.
Application Scenarios:​ GE LM6000 PC/PF aeroderivative gas turbine power generation projects; peaking power plants (Simple Cycle / Combined Cycle); offshore platform power generation and mechanical drive; LM6000 VELOX rapid deployment solutions.
Structural Characteristics:​ Metal cast valve body with multi-port hydraulic connection flanges; dual-channel symmetrical layout with independent servovalve and oil filter per channel; external test and drain ports; nameplate indicating part number, serial number, and calibration parameters.
Working Principle:​ The turbine electronic controller outputs electrical signals to drive the torque motor servovalve. The servovalve regulates hydraulic oil flow direction and volume according to current magnitude, driving the VSV actuator or bleed valve actuator. The pilot valve provides pre-amplification for improved response speed and accuracy. The independent oil filter ensures oil cleanliness entering the servovalve.
Installation Requirements:
  • Reserve installation space and pipeline interfaces per outline drawing
  • Clean hydraulic pipelines per aviation standards to ensure cleanliness
  • Execute electrical wiring per drawing 2-x wiring diagram
  • Perform hydraulic system bleeding and servovalve zero calibration after installation
Usage Precautions:
  • Independent mechanical overspeed trip must be provided on the prime mover before startup
  • Periodically test hydraulic oil viscosity and contamination level
  • Extreme temperature/pressure cumulative operating life shall not exceed 2%
  • Follow ESD protection procedures during maintenance to prevent damage to electronic components
  • Replace filter elements and seals per operating hour intervals

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