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Woodward 8915-989
Product Name (Reference): 3103 Rotary Gas Valve with EM35 Electric Actuator Assembly
Product Description: Based on the Woodward 3103/EM35 product family, the 8915-989 is an all-electric gas fuel metering valve and actuator assembly for industrial gas turbines. It eliminates the need for hydraulic oil supply, using a brushless DC motor with samarium-cobalt permanent magnets to drive a rotary sleeve metering valve with high-precision resolver feedback.
Detailed content
Technical Specifications (Referenced from 3103/EM35 family):
- Valve Body Type: 3103 rotary sleeve gas valve
- Actuator Type: EM35 electric actuator
- Gas Flow Range: 23 to 18,144 kg/h (50 to 40,000 lb/h)
- Inlet Pressure: Up to 6205 kPa (900 psia); CE restricted to 4964 kPa (720 psia)
- Differential Pressure Range: 172 to 6205 kPa (25 to 900 psi); DLE application minimum 345 kPa (50 psid)
- Gas Temperature: -40 to +149 °C
- Ambient Temperature: -40 to +93 °C
- Gas Types: Natural gas, propane, methane (specific gravity 0.5 to 1.05)
- Filtration: 25 μm absolute (β75)
- Flow Accuracy: ±5% of point or ±0.25% of maximum flow; ±2% of point for DLE
- Output Shaft Rotation: 60°
- Continuous Output Torque: ±24.9 N·m (±220 lb-in)
- Peak Output Torque: ±62.4 N·m (±552 lb-in)
- Clutch Slip Torque: ±68 N·m (±600 lb-in)
- Torque Constant: 1.8 N·m/A
- Motor: Brushless DC motor, samarium-cobalt permanent magnet
- Power Input: 28 VDC nominal, 18–32 VDC operating range
- Current: Max 37 A (50 ms pulse), max continuous 15 A
- Slew Rate: 50° travel — open 150 ms, close 80 ms
- Bandwidth: >5 Hz
- Position Accuracy: Analog ±0.50°, Digital ±0.10°
- Resolver Accuracy: ±0.05°
- Component Weight: Approximately 44 kg (96 lb)
- Gas Connection: 2-inch 600# ANSI B16.5 flange
Material Composition:
- Valve Body: Stainless steel
- Internal Components: Through-hardened stainless steel
- Actuator Housing: Cast aluminum flameproof enclosure
- Motor: Samarium-cobalt permanent magnet brushless DC
- Coupling: Stainless steel torsion coupling
Structural Features:
- Planetary gear reduction EM35MR actuator directly coupled to 3103 valve body
- Resolver coupled to metering sleeve via stainless steel bellows
- Built-in slip clutch protects gear train
- Loss-of-power spring return to minimum fuel position
Functional Features:
- Fully electric drive — no hydraulic oil supply required
- Dual resolver configuration for redundant position detection (in select variants)
- Fault detection and automatic protection circuitry
- Self-cleaning metering geometry for sour gas service
- Flameproof enclosure certified to CSA and ATEX standards
Application Scenarios:
- Industrial gas turbine fuel control
- DLE (Dry Low Emission) high-precision fuel metering
- Hazardous area / explosion-proof zone applications
- Integration with Woodward NetCon and MicroNet control systems
- Power generation, chemical processing, oil & gas transmission
Installation & Usage Notes:
- Install with proper explosion-proof conduit seals in classified areas
- Verify CSA/ATEX certification markings on the nameplate before installation in hazardous locations
- Spring-return-to-minimum-fuel behavior must be confirmed safe for the specific turbine protection scheme
