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Hitachi-Man B&W Diesel Engine Service Data: Stroke Sensor For Electronically Controlled Valve (FIVA/ELFI Valve)

The document discusses a stroke sensor used in the Electronically controlled valve (FIVA/ELFI valve) for ME series diesel engines. It notes that the stroke sensor's zero/span adjustment is done as a complete set during manufacturing. Replacing just the stroke sensor on board could cause main spool function failure due to deflection in zero/span position. Therefore, if there are issues with the valve, the entire Electronically controlled valve set should be replaced, not just the stroke sensor. The pilot valve can be replaced individually if its specific failure is obvious.

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1K views1 page

Hitachi-Man B&W Diesel Engine Service Data: Stroke Sensor For Electronically Controlled Valve (FIVA/ELFI Valve)

The document discusses a stroke sensor used in the Electronically controlled valve (FIVA/ELFI valve) for ME series diesel engines. It notes that the stroke sensor's zero/span adjustment is done as a complete set during manufacturing. Replacing just the stroke sensor on board could cause main spool function failure due to deflection in zero/span position. Therefore, if there are issues with the valve, the entire Electronically controlled valve set should be replaced, not just the stroke sensor. The pilot valve can be replaced individually if its specific failure is obvious.

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HITACHI-MAN B&W No.

: HSD-B17107
DIESEL ENGINE SERVICE DATA DATE : 6 Nov. 2017

Stroke sensor for Electronically controlled valve (FIVA/ELFI valve)


ENGINE TYPE: ME series

A stroke sensor for detecting the main spool position (See below figure) is equipped on the
Electronically controlled valve (FIVA/ELFI valve) for HCU (Hydraulic Cylinder Unit) of ME series
engine.
About this stroke sensor, zero/span adjustment of the main spool signal position has been done
in the shape of “a complete set” of Electronically controlled valve (FIVA /ELFI valve complete)
at the time of manufacture by the manufacturer.

There is a possibility that main spool function failure due to deflection of zero/span position
caused by having replacement of stroke sensor by itself only on board by ship crew.
Therefore, even if alarm/ failure of Electronically controlled valve (FIVA/ELFI valve) occurs and
there is a high possibility of stroke sensor failure, please do not carry out replacement of stroke
sensor only, on board by ship crew, but removal and replacement of Electronically controlled
valve (FIVA/ELFI valve) with spare should be done in COMPLETE SET without fail.
In the meantime, the pilot valve can be replaced itself. If the failure of the pilot valve is obvious,
such as the hydraulic pressure does not rise, please replace the pilot valve only.

Stroke sensor

Pilot valve

Main spool

Electronically controlled valve complete

REMARKS：

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