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Woodward 8915-889
Product Name
3103 Valve c/w TM55 Actuator (Electro-Hydraulic Fuel Valve Assembly)
Product Introduction
Based on available product records, the Woodward 8915-889 is identified as a used/surplus GE gas turbine part configured as a “3103 Valve c/w TM55 Actuator” — a 3103 series rotary fuel valve combined with a TM55 electro-hydraulic actuator. This assembly is intended for fuel metering and control in industrial gas turbine applications.
Detailed content
Technical Specifications
Detailed technical specifications for this exact part number (8915-889) were not available in the retrieved materials. For reference, the 3103 valve family with electro-hydraulic actuators typically features:
- Valve Type: Rotary sleeve and gate metering structure (self-cleaning design)
- Actuator: TM55 electro-hydraulic actuator with hydraulic servo piston
- Hydraulic Supply: Turbine lube oil or dedicated hydraulic power unit
- Fail-safe: Spring-return to minimum fuel position upon loss of power
Material Composition
- Valve Body: Stainless steel precision casting
- Internal Components: Fully hardened stainless steel
- Metering Sleeve & Gate: Precision-ground, fully hardened stainless steel
- Seals: High-temperature FKM or other fuel-compatible elastomers
Structural Features
- Direct coupling between actuator and valve body, no intermediate linkage
- Double-acting servo piston for high driving force
- Optional electrical position feedback sensor (RVDT, accuracy ±0.16°)
Working Principle
The electronic controller sends an electrical command signal to the torque motor servo valve inside the TM55 actuator. The servo valve generates a pressure differential that drives the two-stage spool, regulating hydraulic oil flow to the double-acting servo piston. Piston movement rotates the output shaft, driving the 3103 fuel valve metering sleeve to change opening. An internal mechanical feedback mechanism re-centers the servo valve at the target position for precise proportional positioning. Upon power loss, the spring-loaded mechanism pushes the valve to the minimum fuel position for fail-safe protection.
Application Scenarios
- Fuel metering and control for GE industrial gas turbines
- Gas turbine generator sets in power plants
- Mechanical-drive gas turbines for compressors and pumps
Installation Requirements
- Care must be taken during handling to avoid damaging seals and factory calibration settings
- Hydraulic and fuel connection ports must be protected with plastic plugs before final piping
- Hydraulic supply pressure must meet specified range
- Hydraulic system must be purged of trapped air
- Fuel inlet requires a filter meeting cleanliness requirements
- Shielded cable for electrical connections with proper grounding
Usage Notes
- Hydraulic oil cleanliness is critical for actuator life
- Fuel impurity: solid particles < 10 µm ≤ 30 ppm, > 10 µm ≤ 0.3 ppm
- Regular inspection of hydraulic pressure, oil condition, and seal integrity
- Overhaul at intervals recommended by Woodward OEM
