Woodward 9908-415

Digital guide

Product Name: LQ25 Series Standard Liquid Fuel Metering Valve (Base Configuration Version)

Product Introduction: This model is a standard LQ25 series liquid fuel metering valve from Woodward, belonging to the base configuration version of the series. It is suitable for precise liquid fuel control in industrial and aeroderivative gas turbines. Through an integrated electric actuator and rotary plate valve body design, it provides reliable fuel metering in the 1000 kW to 42000 kW power range.

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Detailed content

Technical Specifications:

Applicable power range: 1000 kW to 42000 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 accuracy: 20 microns or finer
Fuel water content limit: 0.1% by volume
Solid sediment limit: 1.0 mg/L
Minimum metering flow: 36 kg/h (80 lb/h)
Flow turn-down ratio: greater than 100:1
Operating temperature range: -28 °C to +85 °C
Storage temperature range: -40 °C to +103 °C
Valve body weight: approximately 35 kg (77 lb)
Nominal pipe diameter: 29.2 mm (1.15 in)
Protection class: IP66
Drive power supply: 18 to 32 VDC
Command signal: 4 to 20 mA
Valve position feedback signal: 4 to 20 mA

Functional Features:

Rotary plate metering structure, single-component motion, high reliability
Non-contact position sensor, no mechanical wear, long life
Rare-earth permanent magnet actuator, high torque density, fast response
Remote shut-off command input, supports emergency stop
Valve/driver fault output for easy system diagnostics

Application Scenarios: Liquid fuel control for gas turbine generator sets, industrial mechanical drive, and marine power systems. Handles diesel, kerosene, gasoline, and other compliant liquid fuels.

Performance Parameters: Flow metering accuracy is ±5% of actual flow or ±0.5% of maximum flow. Full-stroke actuation time is less than 100 ms, meeting the rapid load change demands of gas turbines.

Material Composition: Valve body and internal components are made of corrosion-resistant materials; the sealing system uses fluorocarbon rubber, suitable for various liquid fuel and temperature environments.

Structural Features: Standard structure LQ25 valve body, configured with a single-speed frameless resolver feedback device. Fuel inlet and outlet use SAE standard threaded connections; the electrical interface is in terminal block form.

Working Principle: The driver receives the 4–20 mA command signal from the control system and drives the brushless DC motor to rotate the metering sleeve, adjusting the opening of the metering port.

Installation Requirements:

Must be installed downstream of a positive displacement pump; the bypass return line must remain unobstructed
Valve body fixation requires compliant fasteners, tightened to specification torque
Electrical shielded cable requires single-point grounding to prevent electromagnetic interference from affecting signal accuracy
Installation location should facilitate daily inspection and maintenance operations

Usage Precautions:

Fuel filtration accuracy must reach 20 microns or finer to prevent metering port wear
Periodically inspect the tightness of electrical connections and cable insulation integrity
On-site operation generates pneumatic noise; hearing protection must be worn
Avoid severe collisions during storage and transportation to prevent damage to the resolver and actuator