The Torque Tool Class 1-4 (API 17D) has been specifically developed to provide the highest level of performance. It has integral torque and turns counting sensors for closed loop control. The Torque Tool Class 1-4 conforms to the ISO 13628-8 & API 17D Class 1-4 bucket interface used extensively in the subsea industry for valve overrides operated by ROV. The Torque Tool Class 1-4 (API 17D) has latching wings allowing the tool to hold on to the interface. The latching wings are hydraulically driven forward and spring retracted. Thus in the case of a loss of hydraulic power the wings will release. The tool uses a high specification drive motor for consistent torque output characteristics, even if used with direct hydraulic pressure control without the feedback sensor. The motor shares casing oil with the gearbox therefore avoiding the need for a separate compensator.
Note that for applying torques less than 108Nm (80 ft lbs) the class 1&2 tool is recomended
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Torque Tool Class 1-4 (API 17D)