| 摘要 |
The invention relates to the field of the submarine valve actuators, and specifically to those actuators, that in order to effect a standard valve closing operation are connected to an oleo system feeding an hydraulic cylinder ( 1 ), whose plunger ( 3 ), by a mechanical link, operates the valve and compresses a spring ( 8 ) which provides for the standard opening operation. Said actuators are provided with an input shaft ( 21 ) for connectin a ROV for valve opening and closing operations when there is a failure in the oleo system. The connection between the ROV-operated input shaft ( 21 ) and the mechanical link between the piston ( 3 ) and the spring ( 8 ) is carried out by a planetary gear reducer ( 15 ).
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