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Woodward 8915-917
Product Name
3103 Series Electric Fuel Valve with EM35MR All-Electric Actuator (Explosion-Proof Configuration)
Product Introduction
The Woodward 8915-917 is a fully electric fuel metering valve assembly of the 3103 valve family, driven by an EM35MR all-electric actuator, configured for explosion-proof area applications. It is designed to pair with the Woodward NetCon system for fuel metering and control in gas turbine applications requiring the highest safety and reliability standards.
Detailed content
- Pressure Rating: CE limited to 4964 kPa (720 psia); Enhanced up to 6205 kPa gauge (900 psig)
- Differential Pressure Range: 172 to 6205 kPa (25 to 900 psi)
- Fuel Temperature: –40 to +149 °C
- Ambient Temperature: –40 to +93 °C
- Metered Fuel Types: Natural gas, propane, methane
- Fuel Specific Gravity: 0.5 to 1.05
- Fuel Filtration: 25 µm absolute (β = 75)
- Flow Accuracy: ±5% of point or ±0.25% of maximum flow; ±2% of point for DLE applications
- Minimum Differential Pressure: 172 kPa (non-DLE), 345 kPa (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 Disengagement Torque: ±68 N·m (±600 lb-in)
- Torque Constant: 1.8 N·m/A
- Motor Type: Brushless DC motor, samarium-cobalt permanent magnet
- Power Input: 28 Vdc nominal, 18 to 32 Vdc operating range
- Current: Max 37 A (50 ms), max continuous 15 A
- Slew Rate: 50° stroke — 150 ms opening, 80 ms closing
- Bandwidth: > 5 Hz
- Position Accuracy: ±0.50° analog, ±0.10° digital
- Resolver Accuracy: ±0.05°
- Assembly Weight: Approx. 44 kg (96 lb)
- Fuel Connection: 2-inch 600# ANSI B16.5 flange
Material Composition
- Valve Body: Stainless steel
- Internal Components: Fully hardened stainless steel throughout
- Actuator Housing: Cast aluminum flameproof enclosure
- Motor: Samarium-cobalt permanent magnet brushless DC motor
- Resolver: Non-contact electromagnetic induction structure
Structural Features
- Planetary gear reduction actuator directly coupled to valve body
- Resolver detects metering sleeve position
- Inlet flow guide tube with redundant sealing design
Working Principle
The controller signal drives the motor to change the valve sleeve opening. The resolver provides feedback for closed-loop control. On fault, a spring closes the valve to the minimum fuel position.
Functional Features
- Fully electric drive, no hydraulic oil source
- Brushless DC motor with samarium-cobalt magnets, stator windings fully encapsulated
- High-precision brushless resolver, non-contact position feedback
- Built-in slip clutch protects transmission
- Fault detection and automatic protection
- Spring return to minimum fuel on power loss
- Analog 4–20 mA or digital control mode
- Flameproof design with CSA and ATEX certification
- Self-cleaning metering structure for sour gas service
Application Scenarios
- Explosion-proof area applications
- Paired with Woodward NetCon system
- Power generation, chemical processing, oil & gas transmission
Installation Requirements
- Flameproof cover plate bolts tightened to specified torque
- Explosion-proof cable glands and conduit sealing
- Use auxiliary equipment for lifting during handling
- Proper grounding system connection
- 25 µm absolute filtration at fuel inlet
Usage Notes
- Motor cables must not be coiled
- Maintenance in explosion-proof areas requires power disconnect
- Regularly inspect cable connections
- Surface temperature protection
- Mechanical stops must not be adjusted
- Inspect flexibility after prolonged shutdown
