A new Dual Speed Input Reducer (DSIR) from UK-based Rotork Gears speeds up the manual operation of valves and valve gearboxes by reducing the total number of input turns required. Two gearing ratios are incorporated, with switching between them simply facilitated by pushing or pulling on the input shaft. The high 4.25:1 ratio gearing is used for the portion of the valve stroke where the torque requirement is high, usually at the beginning and end of the stroke. In mid-travel, the valve torque g....

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