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Woodward 8915-980
Product Introduction: This model is an integrated assembly consisting of the 3103 rotary sleeve gas metering valve and the EM35MR all-electric actuator, belonging to the 50801 series configuration variant. As a standard configuration of Woodward’s gas turbine fuel control system, this assembly delivers high-reliability, high-precision gas flow regulation to meet the fuel control requirements of industrial gas turbines across all operating conditions. The all-electric design eliminates the complexity and contamination risks associated with hydraulic systems.
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, no hydraulic oil source required; brushless DC motor with samarium cobalt permanent magnets, fully encapsulated stator windings; high-precision brushless resolver directly coupled to the metering sleeve; dual resolver configuration; built-in slip clutch to protect the transmission mechanism; fault detection and automatic protection; fail-to-safe spring return to minimum fuel position upon power loss; analog or digital control modes; flameproof design with CSA and ATEX certification; self-cleaning metering structure adapted for sour gas service.
Application Scenarios: Industrial gas turbine fuel control; installations without hydraulic oil sources; hazardous area applications; DLE high-precision control; paired with Woodward NetCon and MicroNet systems; power generation, chemical processing, and oil & gas transportation.
Material Composition: Valve body in stainless steel; internals 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.
Structural Features: Planetary gear reduction EM35MR actuator directly coupled to the 3103 valve body; resolver coupled to the metering sleeve via stainless steel bellows; inlet flow guide tube with redundant sealing design.
Working Principle: The controller signal drives the motor to change the valve sleeve opening, with the resolver providing closed-loop feedback control; the valve closes via spring action upon fault. DLE applications achieve precise flow control through valve characterization tables.
Installation Requirements: Bolt the flameproof cover plate to specification torque; use explosion-proof cable glands and conduit sealing; use auxiliary equipment for handling; connect to a properly grounded system; provide 25 μm absolute filtration for the gas inlet.
Usage Precautions: Do not coil the motor cables; perform maintenance with power disconnected in hazardous areas; regularly inspect cable connections; provide surface temperature protection; never adjust the mechanical stops; check flexibility after prolonged shutdown.
