Woodward 8915-896

Digital guide

Product Name

3103 Series Electric Fuel Valve with EM35MR All-Electric Actuator

Product Introduction

The Woodward 8915-896 is a fully electric fuel metering valve assembly belonging to the 3103 valve family, driven by an EM35MR all-electric actuator. This configuration provides precise fuel metering for industrial gas turbines without requiring hydraulic oil supply, fundamentally eliminating hydraulic contamination and maintenance issues.

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Detailed content

Technical Specifications

Pressure Rating: CE limited to 4964 kPa (720 psia); Enhanced version 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 at 50 psid)
Output Shaft Rotation: 60° (limited by mechanical stop)
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 (16 lb-in/A)
Motor Type: Brushless DC motor with samarium-cobalt permanent magnets bonded and encapsulated in rotor
Power Input: 28 Vdc nominal, 18 to 32 Vdc operating range
Current: Max 37 A (for 50 ms), max continuous 15 A
Slew Rate: 50° stroke — 150 ms opening, 80 ms closing (at 28 Vdc, room temperature)
Bandwidth: > 5 Hz
Position Accuracy: ±0.50° analog mode; ±0.10° digital mode (±6 arc-min RSS)
Resolver Accuracy: ±0.05°
Assembly Weight: Approx. 44 kg (96 lb)
Fuel Connection: 2-inch 600# ANSI B16.5 flange (50 mm, 2669 N)

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
Coupling: Stainless steel torsion coupling

Structural Features

Planetary gear reduction actuator directly coupled to valve body
High-precision brushless resolver directly coupled to metering sleeve for position detection
Inlet flow guide tube with redundant sealing design
Self-cleaning metering structure designed for sour (acidic) gas environments

Working Principle

The controller signal drives the motor to change the valve sleeve opening. The resolver provides feedback for closed-loop control. In case of fault, a spring closes the valve to the minimum fuel position.

Functional Features

Fully electric drive, no hydraulic oil source required
Brushless DC motor with samarium-cobalt magnets, all stator windings fully encapsulated
High-precision brushless resolver as non-contact position feedback, directly coupled to valve metering sleeve
Dual resolver configuration for redundant position detection
Built-in slip clutch protects transmission mechanism, disengages at 1.5× maximum actuator output force
Fault detection circuit monitors 4–20 mA interface, position controller, driver, and feedback status
Automatic motor power cut-off on fault or external trip command; valve springs to minimum fuel position
Analog driver accepts 4–20 mA demand signal; digital driver exchanges 16-bit digital position data via serial communication with NetCon/MicroNet systems
Flameproof cast aluminum enclosure compliant with ATEX Category 2
CSA certified: Class I, Division 1, Groups C, D; Class I, Division 2, Groups B, C, D (NRTL/C); LCIE Zone 1 Group IIB

Application Scenarios

Industrial gas turbine fuel metering and control systems
Applications where no hydraulic oil source is available or hydraulic oil is prohibited
Explosion-proof zones (Zone 1 / Division 1)
DLE high-precision control
Paired with Woodward NetCon and MicroNet systems
Power generation, chemical processing, oil & gas transmission, distributed energy

Installation Requirements