2002年、日本ウッドワードガバナー株式会社(現 ウッドワード・ジャパン株式会社)は、舶用制御システム(BMS)事業と、従来からのガバナ(及びシステム)のアフターマーケットサービス事業を営業譲渡し、ウッズはそれらを譲り受けました。

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ウッドワード・ジャパン株式会社(Woodward Japan. Ltd)
OVERHAUL

Woodward Repair & Overhaul Service for GE HA & Mitsubishi JAC Gas Turbines

Woods Corp has obtained authorization from Woodward to perform Silver-level maintenance on its new-generation electric powered valves and actuators found in GE’s HA and Mitsubishi’s JAC gas turbines.
 
As of June 2021, we are currently the only service facility qualified to perform Silver-level service globally outside of Woodward Colorado.   
 
Click here for details on authorization and Silver-level maintenance.
 

Products Subject to Silver-level Authorization

LESV 
Large Electric Sonic Valve  (Gas Fuel Valve)
 
Woodward’s SonicFlo™ electrically actuated valve controls gas flow to any size industrial or utility gas turbine. They build on the proven track record of the hydraulic SonicFlo valve. 
 
The integral electric actuator is single-acting and spring-loaded for failsafe operation. Electrically actuated units utilize a Digital Valve Positioner (DVP) that interfaces with the SonicFlo valve for proper redundant operation.
 
Valve sizes are available from 2” to 6,” with multiple flow profiles for each valve size. 
 

RVP-200 
Rotary Valve Positioner (Purge Valve)
 
The RVP-200 is an electrically actuated rotary control valve which acts as an accurate and precise purge valve.
 
The valve design is a hybrid butterfly and segmented ball valve providing tight shutoff, high flow capacity, high ∆P capability, and elevated pressure and temperature ranges.
 
Can easily be calibrated/ reconfigured on-site via a service tool. 
 

GSxE Rotary Control Valve with Electric Actuation (Gas Fuel Shut-off Valve)
 
The GSxE is an electrically actuated rotary control valve which provides high speed fuel shutoff for emergency and normal shutdown.
 

DVP Digital Valve Positioner 
 
The Woodward DVP is the state-of-the-art driver for electric actuation, providing controls to LESV and GSxE.
 
Woodward has integrated smart technology into the new generation of valves and actuators called an ID (identification) module.
 
Upon connection to a valve or actuator equipped with an ID module, the DVP automatically reads critical valve-specific information to set up the driver.
 

ELA Electric Linear Actuator
 
The ELA actuation system consists of an electronically controlled linear actuator and a digital electronic positioner.
 
The actuator and model-based controller provide the accuracy, bandwidth and slew times required for precise control of the guide vanes.
 
The positioner provides comprehensive diagnostic and communication functions. 
 

Model-specific Test Stand
 
A newly-designed test stand dedicated to new-generation electric powered valves and actuators is used to run sequential test protocol while recording full data under a refined HMI.
 
Real time feedback provided allows for a more efficient and focused  testing and more accurate diagnosis. 
 

Overhaul Process of Woodward Gas Valves and Actuators for Heavy Frame Gas Turbines 

 
Steps 1 & 2 Arrival Inspection and Test As Received (TAR)

Check for any damage by visual inspection that may have been sustained during transport.

 
 

Next, we perform the Incoming Test, or “Test As Received” using special test equipment. The test records the condition and performance of the subject unit upon arrival based on a number of data fields.

Specifically, the test includes such items as zero positioning, shutoff action, open & close speed, current draw test, and leak test.

In case of LESVs, RVPs and GSXEs in GE’s HA and Mitsubishi’s JAC turbines, the testing process is completed automatically by a proprietary test stand, which in turn results in higher reliability and efficiency.
 
 
Steps 3 and 4: Disassembly & Cleaning 

Valves are disassembled to piece parts level and then cleaned.

Parts are cleaned in a way that is appropriate for each part, by water and/or chemicals. 

The removal of oil, dirt and stains is vital to precisely determine the wear and tear, and hence the extent of service required on the subject unit for the overhaul.

 
 
Step 5 Inspection

A thorough inspection on parts that are designed to be reused.

Such parts, known as non-consumable parts, are checked one-by-one to see whether it meets the criteria for reuse by methods such as dimension measurement and penetrant testing in addition to the basic eye test.

In case of non-conformance, we further determine, upon consultation with Woodward Japan when appropriate, whether the subject part needs to be replaced or could be reused after distinct additional treatment.
 
 
Steps 6 & 7 Parts Replacement & Re-assembly

Replace all consumable parts with the overhaul kit, which includes only OEM parts provided by Woodward.

Specifically, the overhaul kit includes such parts as seat disk, gaskets, seals, screws and bolts. 

Re-assemble the subject unit. We take full advantage of our accumulated expertise by using a variety of special tools to complete re-assembly precisely and efficiently.

 
 
Steps 8 and 9 Final Test & Shipment

The Production Test is a similar procedure to the incoming test and uses the same proprietary test stand, but includes more test items and data fields.

The stroke test, seal break-in, shutdown, zero position calibration, and shaft resolver offset calibration, are some examples of additional items at the Production Test.

Very little variance is tolerated in the Production Test. For example, the unit is adjusted and calibrated within a one-one hundredths of a millimeter of accuracy.

The two test results are weighed against each other and cross-checked with product specifications to ensure that the overhaul meets all criteria set by Woodward. 

Once the subject unit passes the Production Test, it is finally ready for shipment.