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Woodward 8915-1145
Product Name: 3103 Gas Valve with EM-35 Electric Actuator (8915-1145, member of Woodward 8915-series gas valve family)
Product Description: Detailed publicly available technical documentation specific to part number 8915-1145 is limited. In Woodward’s 8915-series product listings, 8915-1145 is associated with the 3103/EM35 gas valve family. These assemblies combine a 3103 stainless steel rotary metering valve with an EM-35 electric actuator, factory-matched and calibrated for industrial gas turbine fuel control. The EM-35 actuator provides fully electric, low-maintenance drive for precise fuel metering.
Detailed content
Technical Specifications (per Woodward 3103/EM35 platform data):
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Valve Type: 3103 series stainless steel gas valve
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Actuator Type: EM-35 electric 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, 25 A to driver
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Compatible Drivers: 9907-127 EM35 Digital driver with single resolver feedback; 9907-067 EM35 Analog driver with single resolver feedback
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Control Signal: 4–20 mA or signal from a MicroNet PCM (position control module)
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Self-cleaning metering port: Yes
Key Features (platform-level for 3103/EM35 family):
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Fully electric drive with no hydraulic oil supply required
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Brushless DC motor with samarium-cobalt permanent magnets
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High-precision resolver for position feedback directly coupled to the metering sleeve
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Planetary gear reduction for high torque output
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Fail-safe spring return to minimum fuel position on loss of power
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Self-cleaning, shear-type metering action resistant to gas condensate and contaminants
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Explosion-proof design, CSA and ATEX certified
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3-phase motor field director and tach for commutation with hard overcurrent shutdown
Application Scenarios:
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Industrial gas turbine fuel control
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Facilities without hydraulic oil supply
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Explosion-proof zones (Zone 1 / Division 1)
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Power generation, petrochemical, oil & gas transmission, and distributed energy sectors
Material Composition (platform-level):
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Valve Body: Stainless steel
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Internal Components: Through-hardened stainless steel
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Actuator Housing: Cast aluminum explosion-proof enclosure
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Motor: Samarium-cobalt permanent magnet brushless DC motor
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Coupling: Stainless steel torsion coupling
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Seals: Fluororubber (FKM) or other fuel-resistant elastomer
Structural Characteristics (platform-level):
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EM-35 actuator directly coupled to 3103 valve body via adapter
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Rotary sleeve and shoe metering structure
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Resolver directly coupled to metering sleeve
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Inlet guide tube and redundant sealing design
Working Principle: The electronic controller sends a command signal to the EM-35 driver. The driver energizes the brushless DC motor to produce precise rotation. The motor, after planetary gear reduction, directly drives the 3103 gas valve’s metering sleeve via a stainless steel torsion coupling to change the opening. The resolver detects the actual position of the metering sleeve in real time and feeds it back to the driver, forming a closed-loop position control. On loss of power, the spring returns the valve to minimum fuel position.
Installation Requirements:
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Handle the unit carefully during installation to avoid damage to seals and factory calibration.
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Protect fuel connection ports when not connected to formal piping.
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Configure appropriate fuel filtration (25 micron absolute) at inlet.
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Use shielded cable for electrical connections and ground properly according to hazardous location wiring methods.
Usage Notes:
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Fuel cleanliness is critical; maintain strict filtration standards.
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This 3103/EM35 with single resolver configuration is designated by Woodward as “Not for New Applications” — indicating 8915-1145 belongs to a legacy but supported configuration.
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Follow Woodward recommended maintenance intervals for actuator overhaul.
