Woodward 9908-011

Digital guide

Product Introduction: The 9908-011 belongs to Woodward’s LQ25 family of all-electric liquid fuel metering valves designed for industrial and aero-derivative gas turbine engines. The valve integrates a rotary plate metering port, a brushless DC torque motor actuator, and a non-contacting position sensor into a single compact body. It provides a reliable, cost-effective interface between electronic engine control systems and gas turbines used in power generation, mechanical drive, and marine applications.

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Detailed content

Technical Specifications:

Applicable turbine output power range: 1000 kW to 42 000 kW
Maximum fuel inlet pressure: 1200 psig (8274 kPa)
Maximum fuel bypass pressure: 100 psig (690 kPa)
Rated metering differential pressure: 50 psid (345 kPa)
Fuel filtration requirement: 20 microns or finer
Fuel water content limit: 0.1% by volume
Minimum metering flow: 36 kg/h (80 lb/h)
Flow turndown ratio: >100:1
Drive power supply: 18 to 32 VDC
Command signal: 4 to 20 mA
Valve position feedback signal: 4 to 20 mA
Operating temperature range: -28 °C to +85 °C
Storage temperature range: -40 °C to +103 °C
Valve body weight: approx. 35 kg (77 lb)
Nominal bore: 29.2 mm (1.15 in)
Protection rating: IP66

Functional Features:

Rotary plate metering structure with a single moving part for high reliability
Self-cleaning shear-type metering action resistant to contamination
Non-contacting position sensor eliminates mechanical wear
Rare-earth permanent magnet actuator for high torque density and fast response
Remote shut-down command input
Valve/driver fault output for diagnostics
No field adjustment or calibration required — each valve is factory flow-calibrated

Application Scenarios: Gas turbine generator sets; industrial mechanical drive; marine propulsion systems using diesel, JP-series aviation fuel, kerosene, gasoline, and other compliant distillate fuels.

Material Composition: Corrosion-resistant stainless steel housing and internal wetted parts; fluorocarbon rubber sealing system suitable for a wide range of liquid fuels and temperatures.

Structural Characteristics: The metering sleeve is integral with the actuator rotor, eliminating intermediate gears, linkages, or flex couplings. High-torque brushless DC limited-angle torquer directly couples to both the metering port and position feedback resolver.

Working Principle: The electronic driver receives a 4–20 mA position command and drives the brushless DC torque motor. The motor rotates the rotary plate valve to a precise angle, scheduling the metering port area. Combined with a bypassing regulator maintaining a constant differential pressure across the port, precise fuel flow is achieved. The shear action of the shoe on the rotor valve provides contamination tolerance.

Installation Requirements: Mount the valve per Woodward manual 26161 guidelines. Ensure fuel filtration at or below 20 microns absolute upstream of the valve. The driver may be located up to 100 meters from the valve assembly. Wiring must follow the terminal block diagram exactly; conduit or MIL connector interface options apply depending on configuration.

Usage Notes: Do not remove covers or connect/disconnect electrical connectors unless power is switched off or the area is verified non-hazardous (explosion hazard). Observe ESD precautions — electronic controls contain static-sensitive parts; discharge body static before handling, avoid synthetic clothing, and keep PCBs in anti-static bags until installation. The turbine must be equipped with an independent overspeed shutdown device. Read the full manual and all related safety publications before installation, operation, or servicing.