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Woodward 8915-964
Product Name: 3103 Rotary Sleeve Gas Valve with EM35 Electric Actuator
Product Introduction: The 8915-964 is a fully electric fuel-metering assembly integrating a 3103 rotary sleeve gas valve with an EM35 electric actuator. It is designed for industrial gas-turbine fuel metering and regulation where no hydraulic oil source is available and where operation in hazardous (explosive) areas is required.
Detailed content
Technical Specifications:
- Valve Type: 3103 rotary sleeve gas valve
- Actuator Type: EM35 electric actuator
- Gas Flow Range: 23 to 18,144 kg/h (50 to 40,000 lb/h)
- Inlet Pressure: up to 6205 kPa (900 psia); CE limited to 4964 kPa (720 psia)
- Differential Pressure: 172 to 6205 kPa (25 to 900 psi)
- Fuel Temperature: -40 to +149 °C
- Ambient Temperature: -40 to +93 °C
- Metered Fuel: Natural gas, propane, methane (specific gravity 0.5 to 1.05)
- Filtration: 25 μm absolute (β=75)
- Flow Accuracy: ±5% of point or ±0.25% of maximum flow
- Output Shaft Rotation: 60°
- Continuous Output Torque: ±24.86 N·m (±220 lb-in)
- Peak Output Torque: ±45.20 N·m (±400 lb-in)
- Motor: Brushless DC with samarium-cobalt permanent magnets
- Power Input: 28 Vdc nominal (18–32 Vdc operating range)
- Current: 25 A max for 100 ms, 15 A max continuous, ~3 A steady-state
- Torque Constant: 1.8 N·m/A
- Slew Rate: >600 °/sec
- 50° stroke actuation time: 150 ms open, 80 ms close
- Bandwidth: >5 Hz
- Position Accuracy: ±0.50° analog, ±0.10° digital
- Component Weight: ~44 kg (96 lb)
- Gas Connection: 2-inch 600# ANSI B16.5 flange
Features: Fully electric drive, no hydraulic oil source; brushless DC motor with samarium-cobalt permanent magnets; high-accuracy non-contact resolver position feedback; fault detection and automatic protection; spring auto-return to minimum fuel on power loss; 4–20 mA analog or digital serial communication; flameproof cast-aluminum enclosure with CSA and ATEX certification; self-cleaning metering geometry adapted to sour-gas service.
Applications: Industrial gas-turbine fuel metering and regulation; installations with no hydraulic oil source; fuel control in explosive (Zone 1/Division 1) areas; interfaced with Woodward NetCon digital control systems; power generation, chemical industry, oil-and-gas transmission, and distributed-energy projects.
Materials: Stainless-steel valve body; through-hardened stainless-steel internal moving parts; flameproof cast-aluminum actuator housing; samarium-cobalt brushless DC motor; non-contact electromagnetic resolver; stainless-steel torsional coupling; fuel-compatible elastomeric seals.
Structure: 3103 rotary sleeve valve directly coupled to a planetary-gear EM35 actuator; resolver senses the metering-sleeve position; inlet guide tube with redundant sealing.
Working Principle: The controller demand signal drives the motor to change the valve sleeve position; the resolver provides closed-loop feedback; on power loss or fault the internal spring returns the valve to its minimum-fuel position.
Installation Requirements: Flameproof cover bolts torqued to specification; explosion-proof cable gland and conduit sealing; lifting aids for the ~44 kg assembly; proper earthing system connection; 25 μm absolute fuel filtration upstream of the valve.
Usage Precautions: Motor cable must not be coiled; power must be isolated for maintenance in hazardous areas; periodic inspection of cable connections; surface-temperature protection; mechanical stop screws must never be adjusted; valve freedom of movement must be verified after prolonged shutdown.
