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Woodward 8915-815

Product Name:​ Woodward 8915-815 — 1907 Large Liquid Valve & Actuator Assembly
Product Description:​ The 8915-815 is a complete liquid fuel metering valve and actuator assembly consisting of a Woodward 1907 Large Liquid Fuel Valve driven by an integrated electric actuator (EM-35 or equivalent). The assembly meters liquid fuel to industrial gas turbines across all operating conditions.
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Technical Specifications:
  • Metered Fuel Flow Range: 30:1 turndown ratio
  • Maximum Metered Fuel Flow: 11,340 kg/h (25,000 lb/h)
  • Minimum Fuel Flow: 68 kg/h (150 lb/h) through bleed-valve check ball seat
  • Maximum Bypass Fuel Flow: 13,608 kg/h (30,000 lb/h)
  • Fuel Inlet Pressure (Maximum): 9,377 kPa (1,360 psig) with aluminum body; 17,238 kPa (2,500 psig) with stainless steel body and Class 10.9 (Grade 8) bolts
  • Fuel Outlet Pressure (Maximum): 9,032 kPa (1,310 psig) with aluminum body; 16,893 kPa (2,450 psig) with stainless steel body and Class 10.9 bolts
  • Differential Pressure: 345 to 827 kPa (50 to 120 psig)
  • Fuel Viscosity: 0.5 to 12.0 centistokes
  • Fuel Specific Gravity: 0.77 to 0.91
  • Fuel Cleanliness: Filtered to limit particulate size to 20 μm or smaller; water content limited to 0.1% by volume; solids/sediment/particulates limited to 1.0 mg per liter
  • Porting: Fuel In MS33786-20; Fuel Out MS33786-20; Bypass MS33786-20; Overboard Drain MS33649-4
Fuel Compatibility:​ Most diesels, kerosenes, gasolines, heavy and light distillates including naphtha, gas turbine fuels, fuel oils, biodiesel (with FKM elastomer compatibility). Ultra-low sulfur diesel acceptable with lubricity additives. Ethanol or methanol may be acceptable with internal seal compound substitutions.
Functional Features:
  • Differential pressure regulator maintains constant pressure drop across the metering port
  • Fuel flow remains constant regardless of discharge pressure or inlet flow variations
  • Available in various flow ranges for different applications
  • Exact range selected to meet installation requirements
Application Scenarios:​ Gas turbine liquid fuel metering in power generation, oil & gas, marine, and aviation gas turbine service.
Material Composition:
  • Valve Body: Aluminum or stainless steel (application dependent)
  • Internal Parts: Through-hardened stainless steel
  • Seals: Fluorocarbon (FKM) elastomers
Structural Characteristics:​ The 1907 valve incorporates a differential pressure regulator, a hollow plunger housed within a ported sleeve, and a spring that holds the plunger in contact with the input lever. The size and shape of the metering port are determined by turbine fuel-flow requirements.
Working Principle:​ The actuator receives an electrical signal from the control system and converts it to mechanical motion, positioning the fuel valve plunger. The differential pressure regulator maintains a constant pressure drop across the metering port so the fuel flow at any given valve position remains constant despite variations in discharge pressure or inlet flow.
Installation Requirements:
  • Install the fuel valve square with the governor/actuator linkage to prevent binding
  • The actuator should use approximately two-thirds of available output between minimum and maximum
  • Remaining actuator travel split between maximum and minimum ends to assure positive shutdown and maximum fuel positions
  • Use shielded wiring for electrical connections
  • Follow Woodward outline drawing dimensions for proper fit
Usage Precautions:
  • Liquid fuel must be filtered to 20 μm or finer
  • Water content must not exceed 0.1% by volume
  • Practice all plant and safety instructions before installing, operating, or servicing
  • Failure to follow instructions can cause personal injury and/or property damage
  • Read entire manual and all related publications before installation

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