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Woodward 8915-999
Product Introduction: This model is an integrated assembly of the 3103 rotary sleeve gas metering valve and the EM35MR all-electric actuator, belonging to the 51106 series configuration variant. As the core actuator of gas turbine fuel control systems, this assembly converts electronic control signals into precise mechanical displacement for real-time gas flow regulation, ensuring stable gas turbine operation across all conditions. The all-electric design significantly reduces system complexity and maintenance costs, especially suitable for applications with strict requirements for clean operation and high reliability.
Detailed content
Technical Specifications:
- Valve Type: 3103 Rotary Sleeve Gas Valve
- Actuator Type: EM35MR Electric Actuator
- Gas Flow Range: 23 to 18,144 kg/h (50 to 40,000 lb/h)
- Inlet Pressure: Standard max 6205 kPa (900 psia); CE limited to 4964 kPa (720 psia); Enhanced max 6205 kPa gauge (900 psig)
- Differential Pressure Range: 172 to 6205 kPa (25 to 900 psi)
- Gas Temperature: -40 to +149°C
- Ambient Temperature: -40 to +93°C
- Metered Gas Types: Natural gas, propane, methane
- Gas Specific Gravity: 0.5 to 1.05
- Gas Filtration: 25 μm absolute (β value 75)
- Flow Accuracy: ±5% of point or ±0.25% of maximum flow; ±2% of point for DLE applications
- Minimum Differential Pressure: 172 kPa for non-DLE; 345 kPa 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 Release Torque: ±68 N·m (±600 lb-in)
- Torque Constant: 1.8 N·m/A
- Motor Type: Brushless DC motor with samarium cobalt permanent magnets
- Power Input: 28 Vdc nominal, 18 to 32 Vdc operating range
- Current: Max 37 A (50 ms), max continuous 15 A
- Slew Rate: 150 ms opening for 50° travel, 80 ms closing
- Bandwidth: >5 Hz
- Position Accuracy: ±0.50° analog, ±0.10° digital
- Resolver Accuracy: ±0.05°
- Assembly Weight: Approximately 44 kg (96 lb)
- Gas Connection: 2-inch 600# ANSI B16.5 flange
Functional Features: Fully electric drive with no hydraulic oil source or hydraulic power system; brushless DC motor with samarium cobalt permanent magnets for long-life design; high-precision resolver providing non-contact valve position feedback; dual resolver redundant configuration; built-in slip clutch; integrated fault detection and protection logic; automatic fail-to-safe return to minimum fuel position upon power loss; supports analog 4-20 mA or digital serial communication interface; flameproof design with CSA and ATEX certification; valve body compliant with PED Category II; self-cleaning metering structure adapted for sour gas service.
Application Scenarios: Industrial gas turbine fuel metering and regulation; installations without hydraulic oil sources; fuel control in hazardous areas; DLE applications; paired with Woodward NetCon and MicroNet digital control systems; power generation, cogeneration, chemical processes, and distributed energy projects.
Material Composition: Valve body in stainless steel; internal moving parts in fully hardened stainless steel; actuator housing in cast aluminum flameproof enclosure; motor with samarium cobalt permanent magnet brushless DC; resolver with non-contact electromagnetic induction structure; coupling in stainless steel torsional coupling; seals in gas-corrosion-resistant elastomer.
Structural Features: Planetary gear reduction EM35MR actuator directly coupled to the 3103 valve body; resolver coupled to the metering sleeve; inlet flow guide tube; redundant sealing design.
Working Principle: The electronic controller sends a position command signal to the EM35 driver, which energizes the brushless DC motor to produce precise rotation. The planetary gear reduction converts this rotation into high-torque output, driving the 3103 valve’s metering sleeve. The resolver directly coupled to the metering sleeve provides position feedback, forming a closed-loop control system. Upon power loss or fault, the internal spring returns the valve to the minimum fuel position.
Installation Requirements: Bolt the flameproof cover plate to specification torque; use explosion-proof cable glands and conduit sealing; provide proper system grounding; ensure 25 μm absolute filtration for the gas inlet; verify the gas inlet pressure does not exceed the rated value.
Usage Precautions: Do not coil the motor cables; perform maintenance with power disconnected in hazardous areas; regularly inspect cable connections; never adjust the mechanical stops; check flexibility after prolonged shutdown; keep the actuator within the rated ambient temperature range of -40 to +93°C.
