| 摘要 |
An improved system for installing and removing bolts or nuts from flanged joints or the like which includes a primary wrench for engaging the head of the bolt and rotating the bolt during the high-torque phase of removal or installation; a low-torque motor engaged with the wrench for rotating the bolt during the low-torque phase of removal or installation; a source of hydraulic fluid for driving the low-torque motor during the low-torque phase, and driving the high-torque wrench during the high-torque phase; and valving means for instantly sensing the high-torque and low-torque phases, in order to drive the hydraulic wrench or the motor depending on the torque required.
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