Digital guide
You are here:
Woodward 8915-919
Product Introduction
The Woodward 8915-919 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, serving fuel metering and control in gas turbines across power generation, chemical processing, and oil & gas transmission fields.
Detailed content
Technical Specifications
- 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
