| 摘要 |
In a fitting for shutting off a flow, with a rotary drive for actuating a thread for the closing piece which is actuated by means of a torque control with a starting torque in an initial range of the movement, which torque is at least 10 % higher than the maximum torque in the end position before the cut-off of the drive, according to Patent ... (Application P 3507091.9), the torque control comprises two concentrically arranged opposed ballscrews (27, 34) for actuating a switching member (12) which, in the initial range, activates the higher-torque stage of a gear (1).
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