Digital guide
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Woodward 8915-1025
Product Name: 3103 Valve with EM35MR Actuator
Product Description: 8915-1025 is a Woodward genuine OEM assembly consisting of a 3103 gas valve paired with an EM35MR electric actuator. It is supplied as a worldwide-shipping critical spare part. The EM35MR actuator is the motor-resolver variant of the EM35 family, providing enhanced resolver-based commutation and position feedback for high-precision fuel metering in industrial gas turbines.
Detailed content
Technical Specifications (per Woodward 3103/EM35MR platform data):
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Assembly: 3103 Gas Valve with EM35MR Actuator
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Flow Range: 50–40000 lb/h (approximately 23–18144 kg/h) natural gas
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Maximum Fuel Supply Pressure: 900 psia (6205 kPa)
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Power Supply: 18–32 Vdc, 37 A to driver
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Compatible Driver: 8200-177 EM 24V Digital Driver with single resolver excitation and feedback (for single resolver feedback version)
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Control Signal: 4–20 mA, RS-485 (RT SI/O)
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Motor: 3-phase 24 V drive signal with resolver for motor commutation along with resolver excitation and single position feedback
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Setup: Uses RS-232 DIP (Driver Interface Program) for setup
Key Features:
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Fully electric drive, no hydraulic oil supply required
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EM35MR actuator with motor resolver for commutation
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3103 valve features self-cleaning, shear-type metering action
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High-precision position feedback via resolver
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Fail-safe spring return to minimum fuel position on loss of power
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Suitable for DLE (Dry Low Emission) and non-DLE gas turbine applications
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Genuine OEM part with Certificate of Origin and Certificate of Conformity
Application Scenarios:
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Industrial gas turbine fuel control
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DLE high-precision fuel metering applications
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Power generation, petrochemical, and oil & gas sectors
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Critical spare parts for turbine maintenance
Working Principle: The electronic controller sends a command signal to the EM 24V Digital Driver. The driver energizes the 3-phase brushless DC motor using resolver feedback for commutation, producing precise rotation. The motor, after planetary gear reduction, drives the 3103 gas valve’s metering sleeve to change the opening. The resolver provides position feedback to form a closed-loop control. On loss of power, the spring returns the valve to minimum fuel position.
Installation Requirements:
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Inspect the unit upon receipt for any damage during shipping.
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Follow Woodward’s standard 3103/EM35MR installation guidelines for mounting, piping, and electrical connections.
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Configure appropriate fuel filtration (25 micron absolute) at inlet.
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Use RS-232 DIP for initial driver setup and commissioning.
Usage Notes:
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Maintain strict fuel cleanliness standards per Woodward specifications.
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Follow recommended maintenance intervals and return to factory for overhaul when required.
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Verify safe-use restrictions for hazardous area installations (ambient temperature limitations apply).
