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Woodward 8915-995
Product Name: 3103 Gas Valve with EM35MR Electric Actuator Assembly
Product Introduction: This model is an integrated configuration of the 3103 rotary sleeve gas metering valve with the EM35MR all-electric actuator. The 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, making it 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.
