9902-406
VSV Variable Stator Vane Control · Mechanical-Hydraulic Variable Stator Vane Control for Woodward VSV Control Series
Lifecycle note: Use the unit nameplate and current Woodward documentation as final references before approving a replacement.
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+86 15359408275VSV Variable Stator Vane Control · Woodward VSV Control Series
Woodward 9902-406 is a VSV Variable Stator Vane Control covered explicitly by Woodward manual 40110. The mechanical-hydraulic assembly is used on non-airborne gas turbines to position compressor variable stator vanes, helping prevent compressor stall and supporting efficient reduced-speed operation.
Woodward 9902-406 combines an integral oil pump, tachometer, temperature-sensing element and servo mechanism. Its drive shaft is coupled directly to the turbine shaft, allowing the control to generate hydraulic pressure and sense speed while compressor-inlet temperature biases the vane-position schedule.
The official common VSV specifications list US MIL-L-23699 or MIL-L-7808 hydraulic fluid, 10 µm filtration, a 4 to 82 °C normal fluid-temperature range and a −7 to +93 °C normal ambient range. Woodward lists a dry weight of 12 kg for the covered VSV controls.
Installation of Woodward 9902-406 requires correct drive-shaft alignment, unrestricted rotation, correctly rigged feedback cable and hydraulic connections matching the turbine-manufacturer drawings. The control is factory calibrated and must not be adjusted, repaired or recalibrated in the field.
| Manufacturer | Woodward |
|---|---|
| Model | 9902-406 |
| Product type | Mechanical-Hydraulic Variable Stator Vane Control |
| System family | Woodward VSV Control Series |
| Application | Non-airborne gas-turbine variable stator vanes |
| Integrated elements | Oil pump, tachometer, temperature sensor and servo |
| Hydraulic fluid | US MIL-L-23699 or MIL-L-7808 |
| Filtration | 10 µm |
| Normal fluid temperature | 4 to 82 °C (40 to 180 °F) |
| Normal ambient temperature | −7 to +93 °C (20 to 200 °F) |
| Dry weight | 12 kg (26 lb) |
| Field calibration | Not permitted; factory calibrated to turbine-manufacturer specifications |
Use the installed-unit nameplate, current Woodward documentation and approved site engineering records as the final references.
Woodward 9902-406 positions variable stator vanes on a compatible non-airborne gas turbine. Manual 40110 explains that speed and compressor-inlet temperature determine vane position so the compressor avoids stall and operates efficiently at reduced rotational speed.
Woodward 9902-406 combines an oil pump, tachometer, temperature sensor and servo mechanism. The turbine-driven shaft turns the pump and supplies speed information, while hydraulic and mechanical feedback elements establish the commanded variable-stator-vane position.
Woodward manual 40110 specifies US MIL-L-23699 or MIL-L-7808 hydraulic fluid and 10 µm filtration for the covered VSV controls, including Woodward 9902-406. The turbine lubrication system must also follow the turbine manufacturer’s oil-maintenance requirements.
Woodward 9902-406 must be lifted safely, aligned so the serrated drive shaft rotates freely, and connected according to the official outline and turbine drawings. The feedback cable must be rigged without sticky or binding linkage.
No. Woodward 9902-406 is factory calibrated to the turbine manufacturer’s exact specification. Manual 40110 states that the VSV control cannot be repaired or calibrated in the field; service requests must include its part and serial numbers.
The common Woodward VSV specification gives 4 to 82 °C for normal hydraulic-fluid temperature and −7 to +93 °C for normal ambient temperature. Confirm the complete Woodward 9902-406 nameplate and turbine environment before installation.
A replacement Woodward 9902-406 must match the turbine specification, drive coupling, rotation, hydraulic connections, feedback-cable geometry, compressor-inlet-temperature sensing and vane schedule. Similar VSV housings do not establish direct mechanical or calibration compatibility.
Provide the complete Woodward 9902-406 part number, serial number, turbine model, manufacturer specification, drive details, hydraulic arrangement and photographs of the control and nameplate. These records are necessary because factory calibration is tied to the turbine application.
Woodward manual 40110 explicitly covers Woodward 9902-406 together with related VSV controls. It provides the documented function, common technical limits, installation precautions, factory-calibration restriction, operating principles and official service-information requirements.
Send the complete model, part number, revision, quantity, destination and nameplate photo. We will verify identification details before confirming availability and lead time.
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