Abstract: A liquid-transfer device that comprises a tubular coupling element for fastening in sealed manner to a liquid-transfer orifice and including a bore extending through the coupling element, and a valve member mounted to slide in the coupling element between a closed position for closing the coupling element and a liquid-transfer position for transferring liquid through the coupling element. The valve member is slidable against a return spring urging it towards the closed position and being suitable for sliding from the closed position to the liquid-transfer position under the action of an adapter that is reversibly connectable to the coupling element. One coupling element and the adapter includes a set of longitudinal grooves and the other includes radial teeth that engage in the grooves while the adapter is being actuated, the coupling element having an abutment against which the adapter bears after the valve member has been actuated by the adapter.

Abstract: Electronic components are mounted upon a chassis which slides vertically inside a tank. The components are normally cooled by circulating transformer oil around them. When inspection, maintenance or repair work is required, the bottom of the chassis is sealed to the side of the tank, an opening in the bottom of the chassis is closed and the chassis elevated by pumping the transformer oil beneath the chassis bottom.