Circuit arrangement for operating a torque wrench or similar
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United States of America Patent
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Nov 24, 2015
Grant Date -
May 23, 2013
app pub date -
May 6, 2011
filing date -
May 11, 2010
priority date (Note) -
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Abstract
The invention relates to a circuit arrangement for operating a hydraulic torque wrench or similar, comprising a piston-cylinder unit (18) that can be controlled at a predetermined pressure by a pump (11). Said arrangement is characterized in that the piston-cylinder unit (18) can be controlled by the pump (11) by means of a proportional valve (12) which acts both as a reversing unit between the forward and return travel and as a pressure control valve.
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