| 主权项 |
1. A coupling for conveying a fluid between a stationary part and a rotatable part having confronting ports centered on a rotation axis of the rotatable part, the coupling comprising:
an axially extending tube fixed in the port of one of the parts and extending toward the port of the other of the parts; a control element axially slidable on the tube, the one part, the tube, and the control element forming an annular chamber around the tube pressurizable for axially shifting the control element; a first slide ring connected to the control element and carrying a seal ring turned toward the port of the other part; and a second ring on the other part at the port thereof and axially bearing on the first slide ring, whereby pressurization of chamber presses the slide rings axially against each other. |
