Patent ID: 8047505

Claim:
A subsea regulating device for the linear regulation for a shut-off element of a subsea well blowout preventer comprising: a housing attached to the subsea well blowout preventer; a drive train comprising: at least one motor; a self-locking, double helical gear comprising at least one first helically-toothed gearwheel and at least one second helically-toothed gearwheel; a reduction gear arranged between the at least one motor and the at least one second helically-toothed gearwheel; whereby the at least one motor is connected for movement with the at least one second helically-toothed gearwheel; and a ball spindle drive coupled with the drive train within the housing comprising: a rotating spindle; and a ball nut surrounding the spindle; wherein the ball nut of the ball spindle drive is supported rotationally but axially immovable such that operation of the drive train rotates the ball nut to adjust the spindle linearly in an axial direction; and wherein the spindle is connected for movement to the shut-off element such that linear adjustment of the spindle is transferred to linear adjustment of the shut-off element.