Driving the oil pump
The turbine shaft rotates the integral pump, creating the pressure and flow used by the VSV control.
WOODWARDINDUSTRIAL TURBINE CONTROL
Woodward 9902-406 VSV Variable Stator Vane Control
VSV control · hydraulic vane positioning · gas turbine compressor control
01
Product Description
Woodward 9902-406 is a VSV Variable Stator Vane Control for a non-airborne gas turbine. Its main duty is to position variable stator vanes so the compressor can be controlled across the specified operating range.
Within Woodward 9902-406, the turbine shaft drives the integrated oil pump. The pump supplies hydraulic pressure and flow for the vane-control circuit, while the tachometer and temperature-sensing elements provide the speed and temperature relationships used by the control.
The hydraulic path of Woodward 9902-406 is driven by the turbine shaft through the integral oil pump. Hydraulic pressure moves the vane servo while the tachometer and temperature element provide the speed and temperature relationships used by the VSV control.
02
Product Specifications
| Technical Item | 9902-406 |
|---|---|
| Brand | Woodward |
| Product type | VSV variable stator vane control |
| System role | Variable stator vane positioning |
| Hydraulic fluid | US MIL-L-23699 or MIL-L-7808 |
| Filtration | 10 µm |
| Altitude | Sea level to 2500 m (8000 ft) |
| Fluid temperature | 4 to 82 °C (40 to 180 °F) |
| Normal ambient temperature | −7 to +93 °C (20 to 200 °F) |
| Extreme ambient temperature | −29 to +121 °C, limited exposure |
| Dry weight | 12 kg (26 lb) |
| Drive speed | 0–5850 rpm |
| Drive rotation | Counterclockwise |
| Speed sensing range | 2200–6000 rpm |
| VSV mechanism | Pump, tachometer, temperature sensor and servo |
03
Hydraulic Vane Actuation
Woodward 9902-406 converts turbine-shaft motion and hydraulic energy into controlled variable-stator-vane movement.
Sensing turbine speed
The tachometer element uses the driven control assembly to provide the turbine-speed relationship required by the control.
Positioning the vanes
The servo uses the hydraulic circuit to move the variable stator vanes toward the commanded position.
04
Speed and Temperature Envelope
The operating behavior of Woodward 9902-406 is bounded by its hydraulic, temperature and speed limits.
Pressure and filtration
The hydraulic fluid must meet the listed fluid specification and pass through the 10 µm filtration requirement.
Speed window
The drive-speed and speed-sensing ranges define the rotational conditions in which the control’s sensing and hydraulic functions are evaluated.
Temperature envelope
Fluid, ambient and limited extreme-temperature values apply to the complete VSV control installation, not to a separate sensor.
05
Frequently Asked Questions
What does Woodward 9902-406 control in the turbine?
Woodward 9902-406 controls the position of the variable stator vanes through its hydraulic servo. Confirm the vane linkage and hydraulic connections before evaluating a control response.
Which hydraulic fluid and filter must be used with Woodward 9902-406?
Use fluid meeting US MIL-L-23699 or MIL-L-7808 and provide 10 µm filtration. A fluid that only matches viscosity but not the specified fluid family does not confirm the installation.
How should the drive direction of Woodward 9902-406 be checked?
Verify that the turbine shaft rotation matches the counterclockwise drive-rotation requirement for Woodward 9902-406. Do not infer rotation from a similar VSV housing.
What should be checked when Woodward 9902-406 shows a speed-related problem?
Check the turbine-driven shaft, tachometer path and the 2200–6000 rpm sensing range in that order. Also verify that hydraulic pressure and filtration are within the control’s operating conditions.
Can the ambient limit for Woodward 9902-406 be extended by changing the fluid?
No. Fluid selection does not change the published ambient limits. Keep the normal range and the limited extreme-temperature condition separate when checking the installation.
How should the hydraulic lines for Woodward 9902-406 be verified?
Use the model-specific outline arrangement to match the hydraulic inlet and outlet lines. Confirm the line routing and lifting/handling boundary before putting pressure on the control.
06
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07
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