Woodward 9907-260

Digital guide

Product Introduction: The 9907-260 is an LO25 series electrically driven liquid fuel metering valve developed for liquid fuel control systems on industrial and aero-derivative gas turbines. It integrates a brushless DC motor, a rotary plate metering valve, and a non-contact position sensor into a single compact body, achieving precise closed-loop position control via a matched electronic driver. The LO25 series features self-cleaning shear-type metering, a high turn-down ratio, accurate flow control, and excellent corrosion resistance, forming the core executive element of gas turbine liquid fuel electronic control systems.

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Detailed content

Technical Specifications:

Product Type: Electrically driven liquid fuel metering valve
Control Mode: Digital servo closed-loop control (with matched LQ/LO driver)
Output Form: Rotary plate angular position
Input Command Signal: 4 to 20 mA
Position Feedback Output: 4 to 20 mA
Driver Supply: 18 to 32 VDC
Operating Media: Diesel, JP series fuels, kerosene, gasoline, naphtha, gas turbine fuel oil, and other compliant distillates
Duty: Continuous modulation

Functional Features:

Fully integrated all-electric design with brushless DC motor, metering valve, and position sensor integrated in one body — no gear backlash
Self-cleaning shear-type metering via rotary plate, strong anti-pollution capability
High flow turn-down ratio exceeding 100:1
Flow accuracy of ±5% of nominal flow point or ±0.5% of maximum rated flow (whichever is greater)
Non-contact position sensing using a single- or three-speed resolver — no mechanical wear
Built-in differential pressure regulator: single-stage spring-loaded piston diaphragm type
Corrosion-resistant materials in all fuel-wetted parts

Application Scenarios: Liquid fuel metering for industrial gas turbines; fuel control for aero-derivative gas turbines; fuel regulation systems for power-generation gas turbines; fuel control for mechanical-drive gas turbines; marine gas turbine liquid fuel systems; fuel metering for combined heat and power (CHP) units.

Performance Parameters:

Flow Range: 80 to 26,000 lb/h (36 to 11,794 kg/h)
Maximum Fuel Inlet Pressure: 1,200 psig (8,274 kPa)
Maximum Fuel Bypass Pressure: 100 psig (690 kPa)
Regulated Differential Pressure: 50 psid (345 kPa) nominal
Pressurizing Valve Opening Pressure: 200 psid (1,379 kPa)
Full-Stroke Slew Rate: less than 0.100 s
Valve Shut-off Slew Rate: less than 50 ms
Motor Speed: 35 rad/s (typ.)
Metering Leakage: less than 80 lb/h @ 600 psig
Operating Temperature: -28°C to +103°C
Storage Temperature: -40°C to +103°C
Protection Rating: IP66

Material Composition:

Valve Body: High-strength aluminum alloy (standard) or stainless steel (marine environment)
Metering Plate: Corrosion-resistant hardened stainless steel, precision EDM-machined
Metering Sleeve: Integrated with motor rotor, corrosion-resistant material
Motor Housing: Aluminum alloy with cooling fins
Motor Rotor: Rare-earth permanent magnet material
Position Sensor: Single- or three-speed resolver
Differential Pressure Regulator: Spring-loaded piston diaphragm type
Seals: Fluoroelastomer (FKM)
Internal Fasteners: Stainless steel

Structural Features:

Integrated brushless DC motor co-axial with the metering valve — no gear transmission, eliminating backlash and wear
Rotary plate metering structure — metering sleeve integrated with motor rotor, single moving part for fuel metering
Hollow-shaft non-contact resolver directly detecting rotor position with no contact wear
Built-in differential pressure regulator maintaining ≈345 kPa across the metering port
Standard SAE threaded ports complying with SAE J1926/1 and MS16142 straight thread standards
Overboard drain port between dual-redundant shaft seals for leak monitoring
Standard mounting holes on valve bottom for rigid bracket mounting

Working Principle: The control system sends a 4-20 mA position command to the matched driver; the driver converts the signal into brushless DC motor drive current.

Installation Requirements: Must be installed downstream of a positive displacement pump with a clear system return line; valve orientation should allow convenient actuator access for service; the electronic driver should be mounted in a control cabinet with minimal vibration; fuel line connections use SAE J1926/1 7/8-14 thread.

Usage Notes: Fuel water content must be strictly controlled within 0.1% by volume to prevent internal corrosion; periodically inspect the metering port area for abnormal wear; driver parameters shall not be arbitrarily changed as this affects closed-loop stability; replacement seals must use originally specified FKM parts.