Abstract: Device for separating two non-mixable liquids with different specific gravities such as oil and water, which device contains a first separation tank (2) with an overflow (11, 12) for each of the liquids to be separated, a coalescence filter (3) whose inlet (14) is connected via a pipe (13) to the overflow (12) of the first separation tank (2) for the liquid with the highest specific gravity and a second separation tank (4) which is connected to the outlet (19) of the coalescence filter (3), characterized in that the overflow (12) onto which the coalescence filter (3) is connected is situated higher than the inlet (14) of the coalescence filter (3) with a difference in height H1 which is such that the liquid mass in the pipe between the first separation tank (2) and the coalescence filter (3) provides for the necessary pressure to bridge the pressure drop in the coalescence filter (3) and the counterpressure of the liquid in the second separation tank (4).

Abstract: The invention concerns a compressor installation with a water-injected compressor element (1) having a water cycle (6) and a water supply device (15) for supplying water to the water cycle (6), containing a water supply line (16) with a controllable valve (18) and a reverse osmosis filter (17) therein. Onto the water cycle is connected a by-pass (21) in which are erected an ion exchanger (22) and a controllable valve (23). A valve (18) in the water supply line (16) is controlled by a device (20) for measuring the amount of water in the water cycle (6), and the valve (23) in the by-pass (21) is controlled by a device (24) for measuring the conductivity of the water.