Gasket compression control method having tension-related feedback
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United States of America Patent
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-
Nov 6, 1990
Grant Date -
N/A
app pub date -
May 2, 1988
filing date -
May 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When tensioning a gasketed joint, the drive system applies rotational force to a threaded fastener while the monitor and control unit continuously compares a torque-related variable to a shutoff point. When the shutoff point is reached the control system reduces the drive system power, preferably to zero. After a preselected time pause the drive system is re-energized and applies another torque application until the torque-related variable again reaches the shutoff point. When the gasket is adequately compressed so that further torque applications cause insignificant increases in gasket compression, the tensioning operation is terminated. Feedback is provided by tension-related variables such as incremental angle of turn and/or incremental elapsed time of the torque application to determine when the tensioning cycle is complete.
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