Woodward 8915-915

Digital guide

Product Name: Electrically Actuated Gas Fuel Metering Valve Assembly (3103 valve body with EM35MR electric actuator platform).

Product Overview: The 8915-915 belongs to Woodward’s 8915 series of fully electric, explosion-proof gas fuel metering valve assemblies designed for industrial gas turbines. It integrates a rotating-sleeve 3103 metering valve with a brushless DC electric actuator, eliminating the need for hydraulic oil supply.

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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 Gas 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)
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 surge), max 15 A continuous
Slew Rate: 50° stroke opens in 150 ms, closes in 80 ms
Bandwidth: >5 Hz
Position Accuracy: ±0.50° analog, ±0.10° digital
Resolver Accuracy: ±0.05°
Component Weight: Approx. 44 kg (96 lb)
Gas Connection: 2-inch 600# ANSI B16.5 flange

Functional Features: Fully electric drive with no hydraulic oil source; brushless DC motor with samarium-cobalt magnets and fully sealed stator windings; high-precision brushless resolver directly coupled to the metering sleeve; dual-resolver configuration for redundant position detection; built-in slip clutch protecting the transmission mechanism; fault detection and automatic protection; spring-return to minimum fuel position on power loss; selectable analog or digital control modes; explosion-proof design certified by CSA and ATEX; self-cleaning metering structure adapted to sour gas service.

Application Scenarios: Industrial gas turbine fuel control; installations with no hydraulic oil source; hazardous areas (Zone 1/Division 1); DLE high-precision control; integration with Woodward NetCon and MicroNet systems; power generation, chemical processing, oil & gas transport, and distributed energy.

Material Composition:

Valve Body: Stainless steel
Internal Components: Through-hardened stainless steel
Actuator Housing: Cast aluminum explosion-proof enclosure
Motor: Samarium-cobalt permanent magnet brushless DC
Resolver: Non-contact electromagnetic induction structure
Coupling: Stainless steel torsional coupling

Structural Characteristics: Planetary gear-reduced EM35MR actuator directly coupled to the 3103 valve body via stainless steel torsional coupling; 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; the resolver provides closed-loop feedback control; on fault the spring closes the valve to the minimum fuel position.

Installation Requirements: Install per Woodward 8915-series instruction manual; verify hydraulic supply pressure (where applicable) and exclude trapped air before commissioning; configure gas inlet filtration to the specified 25 μm absolute grade; use shielded cable with proper grounding for electrical connections; in high-temperature environments ensure the assembly is shielded from direct radiant heat.

Usage Notes: Maintain fuel gas cleanliness — solid particles below 10 μm shall not exceed 30 ppm, and particles above 10 μm shall not exceed 0.3 ppm; regularly inspect hydraulic system pressure and oil condition (if applicable), electrical connector sealing, and position feedback signal stability; replace seals when aged in high-temperature service; follow Woodward OEM-recommended overhaul intervals for return-to-base refurbishment.